Messko Mtec ept202 User manual

Operating Instructions BA 2076/02/01

www.messko.de MTeC®- EPT20EPT20

EPT20EPT20

EPT2022

2 Digital ThermometerDigital Thermometer

Digital ThermometerDigital Thermometer

Digital Thermometer

MesskoMessko

Messko

2BA 2076/02/01

BA 2076/02/01

1GenerGener

GenerGener

Generalal

alal

al ......................................................................................................................................................................................................................................................................................................................................................................

......................................................................................................................................................................................................................................................................................................................................................................

................................................................................................................................................................................... 55

1.1 Safety Instructions ...................................................................................................................................................................... 5

1.2 Use as Specified ........................................................................................................................................................................... 5

1.3 Notes on the Operation of the Device ................................................................................................................................... 5

1.4 Design ............................................................................................................................................................................................ 5

1.5 Capacity Features of the Basic Device ................................................................................................................................... 6

2Technical DataTechnical Data

Technical DataTechnical Data

Technical Data ..............................................................................................................................................................................................................................................................................................................................................

....................................................................................................................................................................... 66

3MountingMounting

MountingMounting

Mounting ..............................................................................................................................................................................................................................................................................................................................................................

............................................................................................................................................................................... 99

3.1 EPT202 for Rail Mounting ......................................................................................................................................................... 9

3.2 EPT202 as 19" Rack .................................................................................................................................................................... 9

3.3 EPT202 for Control Panel Mounting ...................................................................................................................................... 9

3.4 EPT202 for Installation in the Motor Drive ED of the MR On-Load Tap-Changer ................................................... 10

4Electrical connectionElectrical connection

Electrical connectionElectrical connection

Electrical connection....................................................................................................................................................................................................................................................................................................................

.......................................................................................................................................................... 1010

1010

4.1 Supply Voltage ........................................................................................................................................................................... 10

4.2 Sensor Inputs .............................................................................................................................................................................. 10

4.3 CT Input (Secondary Current Transformer) ......................................................................................................................... 11

4.4 Analog Outputs .......................................................................................................................................................................... 11

4.5 Digital Interfaces ....................................................................................................................................................................... 11

4.6 Switching Contacts ................................................................................................................................................................... 12

5Function DescriptionFunction Description

Function DescriptionFunction Description

Function Description....................................................................................................................................................................................................................................................................................................................

.......................................................................................................................................................... 1313

1313

5.1 Basic Function ........................................................................................................................................................................... 13

5.2 Sensor Inputs .............................................................................................................................................................................. 13

5.3 Analog Outputs ..........................................................................................................................................................................13

5.4 Device Self-Monitoring ...........................................................................................................................................................13

5.5 Switching contacts S1…S4 ..................................................................................................................................................... 13

5.6 Cooling-Phase-Specific Parameter Records ...................................................................................................................... 13

5.7 Load Change Operation ........................................................................................................................................................... 14

5.8 Switching contacts ALARM and TRIP ................................................................................................................................... 14

5.9 Calculation of Life Consumption ..........................................................................................................................................14

5.10 Datalogging ................................................................................................................................................................................ 15

5.11 Masking out the Winding Temperature .............................................................................................................................. 15

6OperationOperation

OperationOperation

Operation ..........................................................................................................................................................................................................................................................................................................................................................

............................................................................................................................................................................. 1616

1616

6.1 Front Plate ................................................................................................................................................................................... 16

6.2 Menu Prompting ....................................................................................................................................................................... 16

Table of Contents

4BA 2076/02/01

Keep for future reference!

NONO

NOTETE

TETE

The information in these operating instructions may differ

from the actually delivered device.

Subject to change without prior notice.

7Indication and PIndication and P

Indication and PIndication and P

Indication and Parar

arar

arameterizationameterization

ameterizationameterization

ameterization ..........................................................................................................................................................................................................................................................................

..................................................................................................................................... 1818

1818

7.1 Input and Output Configuration........................................................................................................................................... 18

7.2 Winding Specification Parameters ....................................................................................................................................... 18

7.3 Switching Contacts ................................................................................................................................................................... 19

7.4 <MANUFACTURER> Menu ....................................................................................................................................................... 20

7.5 <OPERATOR> Menu .................................................................................................................................................................. 20

7.6 <USER> Menu ............................................................................................................................................................................. 20

7.7 <DATA-LOGGING> Menu ......................................................................................................................................................... 21

7.8 <LIFE-CONSUM.> Menu ........................................................................................................................................................... 21

7.9 <PEAK-VALUES> Menu ............................................................................................................................................................ 22

8Visualization SoftwareVisualization Software

Visualization SoftwareVisualization Software

Visualization Software ..............................................................................................................................................................................................................................................................................................................

....................................................................................................................................................... 2323

2323

8.1 Installation .................................................................................................................................................................................. 23

8.2 Design of the Software ............................................................................................................................................................ 24

8.3 The EPT202 Monitor ................................................................................................................................................................. 25

8.4 Menu Bar ..................................................................................................................................................................................... 25

8.5 <Settings> Menu ....................................................................................................................................................................... 26

8.6 <Parameter> Menu ................................................................................................................................................................... 27

8.7 The Print Assistant ..................................................................................................................................................................... 27

8.8 <User> Menu .............................................................................................................................................................................. 28

8.9 <Switching Points> Menu ...................................................................................................................................................... 34

8.10 <Winding> Menu ...................................................................................................................................................................... 35

8.11 Easy Set Function ...................................................................................................................................................................... 36

8.12 <Device data> Menu ................................................................................................................................................................ 37

9AppendixAppendix

AppendixAppendix

Appendix ............................................................................................................................................................................................................................................................................................................................................................

.............................................................................................................................................................................. 3838

3838

9.1 Dimension Drawing of the EPT202 for Rail Mounting ................................................................................................... 38

9.2 Dimension Drawing of EPT202 for 19" Rack ..................................................................................................................... 39

9.3 Dimension Drawing of EPT202 for Control Panel Mounting ........................................................................................ 40

9.4 Dimension Drawing of EPT202 for Installation in Motor Drive ED of the MR On-Load Tap-Changer ............... 41

9.5 Connection Diagram of the EPT202 for Top-Hat Rail Mounting ................................................................................. 42

9.6 Connection Diagram of the EPT202 for Control Panel Installation and 19" Subrack ........................................... 43

9.7 Circuit Diagram for 4 to 20 mA Sensor Connection ........................................................................................................ 44

9.8 Circuit Diagram for Pt100 Sensor Connection ................................................................................................................. 45

Table of Contents

BA 2076/02/01

1 General

1GenerGener

GenerGener

Generalal

alal

1.1.1.1.

1.1. Safety InstructionsSafety Instructions

Safety InstructionsSafety Instructions

Safety Instructions

All personnel involved in installation, commissioning,

operation, maintenance or repair of the equipment must

· be suitably qualified and

· strictly observe these operating instructions.

Improper operation or misuse can lead to

· serious or fatal injury,

· damage to the equipment and property of the operator

and

· a reduction in the efficiency of the equipment.

Safety instructions in this manual are presented in three

different forms to emphasize important information.

WARNINGWARNING

WARNING

This information indicates particular danger to life and

health. Disregarding such warnings can lead to serious or

fatal injury.

1.21.2

1.2 Use as SpecifiedUse as Specified

Use as SpecifiedUse as Specified

Use as Specified

Together with a temperature sensor, the EPT202 device from

the MTeC® series indicates the oil and winding temperature

of oil-insulated transformers, reactors or on-load

tap-changers. The device can be used to control the individu-

al cooling stages based on load and temperature and, in

emergencies, shut down the entire transformer.

Before commissioning the device, it is essential to read and

adhere to the limit values for the application specified on the

nameplate and operating instructions.

1.31.3

1.3 Notes on the Operation of the DeviceNotes on the Operation of the Device

Notes on the Operation of the DeviceNotes on the Operation of the Device

Notes on the Operation of the Device

User adherence to national accident prevention regulations is

mandatory.

It is also pointed out that work on active (i.e., parts which are

hazardous to touch) is only permitted when these parts are

potential free or are protected against direct touch.

National regulations pertaining to electrical installation must

be observed. To ensure correct operation, it is essential to

connect the protective conductor (PE).

1.41.4

1.4 DesignDesign

DesignDesign

Design

The device is available in 4 models.

- Compact device in an aluminum housing for installation on

a rail in accordance with EN 60 715 TH 35-7.5 and

TH 35-15

- 19" Rack (3 HE, 42 TE, depth: 176 mm) for insertion in a

19" cabinet system

- Device for control panel installation with panel cutout,

236 mm x 142 mm

- 19" subrack for installation in the motor drive ED of the

MR on-load tap-changer

The electrical connection is performed with plug-in

connectors in accordance with DIN 41 612. An SPI interface

is available on the side of the device for the connection of

extra modules (OL/CT).

NOTENOTE

NOTE

These notes provide important information on a certain

topic.

CAUTIONCAUTION

CAUTION

This information indicates particular danger to the

equipment or other property of the operator, risk of

serious or fatal injury.

CAUTIONCAUTION

CAUTION

Make sure that all power supplies leading to the digital

thermometer are disconnected at the switchgear cubicle

before doing impulse voltage testing or any other kind of

applied voltage testing to the transformer.

NOTENOTE

NOTE

When using the additional modules EPT202OL, EPT202CT or

EPT202OL/CT, please refer to the operating instructions

BA2078.

6BA 2076/02/01

2 Technical Data

An Easy-Set function is also available with the visualization

software with which the parameterization can be performed

in accordance with the IEC standard.

Four relays are used to control 5 cooling stages. These can

also be selectively controlled during load changing operation.

This permits a time-equalized load of the individual cooling

stages. In addition one relay each is available for Alarm and

Trip. The switching point, the hysteresis and the delay time of

the individual relays can be set as desired and they can be

addressed via the oil or winding temperature. Manual

operation is also possible as an alternative.

A further special feature is the life management calculation

in accordance with the IEC or ANSI standard.

A temperature sensor can be connected to the 4-20mA sensor

input to record the ambient temperature. A Pt100 sensor must

then be used to detect the Top-Oil temperature.

1.51.5

1.5 Capacity FeaturCapacity Featur

Capacity FeaturCapacity Featur

Capacity Features of the Basic Devicees of the Basic Device

es of the Basic Devicees of the Basic Device

es of the Basic Device

The basic device indicates one oil and winding temperature

each on an LCD display. This requires the connection to the

device of a temperature sensor with Pt100 or 4…20mA

output which measures the „TopOil“ temperature in the

transformer. The minimum and maximum values of the oil

and winding temperature as well as the maximum value of

the load current are indicated and can be called later. Two

analog outputs and one RS 485 interface are available for

remote indication of the temperature values.

The data logging function is used to store the temperature-

specific data on the device at regular intervals so that it can

be called at all times.

The thermal image of the transformer is simulated in

accordance with IEC 60354 or ANSI standard. For this the CT

current which indicates the load of the transformer must be

connected to the device. Parameterization of the transformer

and cooling stage can be performed via the keys on the front

or via visualization software which is available as an option.

2Technical DataTechnical Data

Technical DataTechnical Data

Technical Data

Protective housingProtective housing

Protective housing

Rail mounting:

Aluminum housing, can be snapped on for carrying rail in accordance with DIN EN 60715 TH 35-7.5

and TH 35-15, protection rating: IP 00 in accordance with IEC 60529, weight: approx. 1.2 kg

19" Subrack 42TE: 19" rack in accordance with DIN 41494, part 5, 223 x 133 x 178 mm (W x H x D) for installation in

19" cabinet system, protection rating: IP 00 in accordance with IEC 60529, weight: approx. 1.5 kg

Control panel mounting: Aluminum housing, 270 x 200 x 133 mm (W x H x D) for panel cutout 236 x 142 mm (W x H),

protection rating: IP 00 in accordance with IEC 60529, weight: approx. 1.5 kg

19" Subrack 84TE: 19" rack in accordance with DIN 41494, part 5, 483 x 133 x 178 mm (W x H x D),

protection rating: IP 00 in accordance with IEC 60529, weight: approx. 2.5 kg

Temperature rangeTemperature range

Temperature range

Operation: -25°C ... +70°C

Storage: -30°C ... +85°C

Operator elements, indication, terminalsOperator elements, indication, terminals

Operator elements, indication, terminals

Operator elements: 5 function buttons with perceptible pressure point

Indication: Monochrome display, white letters on blue backlight, 128 x 64 pixels

Status LEDs: 1 LED, green, for „POWER“ operational indication

1 LED, yellow, for „ALARM“ switching contact

1 LED, red, for „TRIP“ switching contact

1 LED, red, for „ERROR“ switching contact

4 LEDs, yellow, for switching contacts S1, S2, S3 and S4

Terminals: Safety screw terminals, for rigid braided leads: 0.2 - 2.5 mm2, AWG 24 - 12,

flexible braided leads (with core end sleeves): 0.2 - 2.5 mm2, AWG 24 - 12

BA 2076/02/01

2 Technical Data

InputsInputs

Inputs

Supply voltage: 100 to 240 V AC, 50 to 400 Hz

100 to 353 V DC

optional: 20-72VDC

Power consumption: Max. of 10 VA or 10 W

Temperature sensor: Pt100 signal in accordance with IEC 751 in 2 or 3-conductor technology or 4 to 20 mA signal (active

or passive), standard measuring range: -20 °C to +140 °C (others on request)

Measuring converters can be provided for other input signals e.g. 0 to 1 mA or 0 to 10 V.

Optional: The 4-20mA input can be used to record the ambient temperature (active or passive

signal), the standard measuring range is -40 to +120°C.

Current transformer input: 0.5 to 5 A CT rated current

Continuous load capacity: 10 A for 8 hours

Short-time current: 500 A for 1 second

Optional: Design including a split core current transformer for cable diameters up to max. Ø10

OutputsOutputs

Outputs

Analog outputs: 1 oil temperature, temperature range: -20 °C to +140 °C

1 winding temperature, temperature range: 0 °C to 160 °C

Both analog outputs can be set as desired to: 0 to 10 V

0 to 1 mA

4 to 20 mA (error signal < 3.6 mA)

4 to 20 mA (error signal > 22 mA)

0 to 20 mA (error signal > 22 mA)

Interfaces: 1 RS 232 on 9-pin, sub D plug for parameterization and data logging via PC

1 RS 485 on screw terminals

1 SPI bus on 15-pin, sub D plug for connection of additional modules (for DIN rail mounting only)

Relays: 4 c/o contacts for switching points S1 to S4, contact capacity AC: 250 V / 12A, DC: 110V / 0.4 A

2 c/o contacts for ALARM and TRIP, contact capacity AC: 250 V / 5A, DC: 110V / 0.4 A 1 n/c

contact for ERROR message, contact capacity AC: 250 V / 5A, DC: 110V / 0.4 A

TestsTests

Tests

Electrical safety: Protection class 1 in accordance with IEC 60536

Protection rating IP00 in accordance with IEC 60529

Degree of soiling 2 in accordance with IEC report 664-1

Overvoltage category III in accordance with IEC report 664-1

Electromagnetic compatibility:

IEC 61000-4-2 Interference immunity against electrostatic discharge with 6/8 kV

IEC 61000-4-3 Interference immunity against HF fields with 10 V/m, 80 to 1000 MHz

IEC 61000-4-4 Interference immunity against bursts with 2 kV

IEC 61000-4-5 Interference immunity against surges with 2 kV

IEC 61000-4-6 Interference immunity against HF on lines with 10 V, 150 kHz to 80 MHz

IEC 61000-4-8 Interference immunity against magnetic fields with 30 A/m, 50 Hz, continuous

IEC 61000-4-11

Interference immunity against voltage drops with AC supply: 30 % / 0.5 period

60 % / 5 periods; with DC supply 100 % / 10 ms and 60 % / 100 ms

EN 61000-6-2 CE conformity

EN 61000-6-4 CE conformity

Temperature and climate resistance:

IEC 60068-2-1 Dry cold, -25 °C/20 hours

IEC 60068-2-2 Dry heat, +70°C / 16 hours

IEC 60068-2-3 Moist heat, constant, +40°C/93 % / 2 days, no moisture condensation

IEC 60068-2-30 Moist heat, cyclic (12 x 12 hours) + 55°C / 93 % / 6 cycles

8BA 2076/02/01

Setting rangesSetting ranges

Setting ranges

ParameterParameter

Parameter RemarksRemarks

RemarksRemarks

Remarks Step SizeStep Size

Step SizeStep Size

Step Size

Temperature range, analog output 1 Calibration at plant: -20 to +140 °C 1 °C

(specifies the range of sensor input (others on request)

and analog output 1)

Temperature range analog output 2 Calibration at plant: 0 to +160 °C 1 °C

(others on request)

Data logging interval 5 to 1440 min. 1 min.

Test function 0 to 150% of temperatur range 0.1 °C

(standard -20 to +220 °C)

Zero point correction ± 10 % of temperature range 0.1 K

(standard -16.0 to 16.0 K)

RS 485 address 0 to 79

Load change interval 0 to 9999 h 1 h

Switching points S1 to S4 Adjustable between 0.1 °C

hysteresis and 150% of

temperature range

Hystereses S1 to S4 Min. of 1% of temperature range 0.1 K

Delay times S1 to S4 0 to 120 sec. 0.1 sec.

Switching points ALARM, TRIP Adjustable between 0.1 °C

hysteresis and 150% of

temperature range

Hystereses ALARM, TRIP Min. of 1% of temperature range 0.1 K

Delay times ALARM, TRIP 0 to 120 sec. 0.1 sec.

CT transformer ratio 1 to 5000:1 1

Hotspot factor (H) 1.0 to 2.0 0.1

CT rated current 0.50 to 5.00 A 0.01A

Gradient (gr) 0.0 to 50.0 K 0.1 K

Winding exponent 1.0 to 2.0 0.1

Time constant 0 to 30 min. 1 min.

2 Technical Data

BA 2076/02/01

3 Mounting

3MountingMounting

MountingMounting

Mounting

3.13.1

3.1 EPT202 for Rail MountingEPT202 for Rail Mounting

EPT202 for Rail MountingEPT202 for Rail Mounting

EPT202 for Rail Mounting

The EPT202 (see Fig. 1) is designed for mounting on a rail in

accordance with EN 60715 TH 35-7.5 or TH 35-15. To install,

the device must be placed on the rail with the mounting

clamps and pressed down until the device snaps in onto the

rail. For the dimensions, see the appendix (chap. 9.1).

3.23.2

3.2 EPT202 as 19" subrack 42TEEPT202 as 19" subrack 42TE

EPT202 as 19" subrack 42TEEPT202 as 19" subrack 42TE

EPT202 as 19" subrack 42TE

The standardized rack of the EPT202 is designed for

installation in a 19" cabinet system. Slide the subrack into the

cabinet system and secure it using the bore holes on the front

(see appendix, chap. 9.2).

Fig. 1

3.33.3

3.3 EPT202 for Control Panel MountingEPT202 for Control Panel Mounting

EPT202 for Control Panel MountingEPT202 for Control Panel Mounting

EPT202 for Control Panel Mounting

A panel cutout must be provided in the switching cabinet for

the installation of the EPT202. For dimensions, see appendix,

chap. 9.3. Slide the device into the cutout and secure with

the help of the bored holes on the front.

Fig. 3Fig. 2

CAUTIONCAUTION

CAUTION

The device may only be mounted, electrically connected

and commissioned by qualified, trained personnel as

specified by these operating instructions.

The user must ensure that the device is used for its

intended purpose.

Arbitrary and incorrect work which is performed without

previously consulting Messko is forbidden for safety

reasons!

10 BA 2076/02/01

3.43.4

3.4 EPT202 for subrack 84TEEPT202 for subrack 84TE

EPT202 for subrack 84TEEPT202 for subrack 84TE

EPT202 for subrack 84TE

A 19“ subrack of double width (84TE) is available for

integration into the motor drive ED of a MR on-load tap-

changer or any other switching cabinet application.

Installation is the same as previously described for the 19“

subrack in chapter 3.2. Please refer to the appendix for all

relevant dimensions.

4Electrical ConnectionElectrical Connection

Electrical ConnectionElectrical Connection

Electrical Connection

The EPT202 must be connected as shown in the device-

specific connection diagrams in the appendix (see chap. 9.5

to 9.7). The individual connections will now be described in

more detail below. The numbering of the terminals is deviating

between the EPT202 for rail mounting and the EPT202 for

panel mounting or 19“ rack. The numbering for panel

mounting and 19“ rack is given in brackets in the following

describtion

WARNINGWARNING

WARNING

Make sure that the electrical connection of the EPT202

and particularly the grounding is performed carefully.

Otherwise there is a danger to life!

Do not switch on the supply voltage until the electrical

connection has been made correctly.

POWER

TRIP

ERROR

ALARM

Messko

S 1

S 3

S 4

S 2

Fig. 4

4Electrical ConnectionElectrical Connection

Electrical ConnectionElectrical Connection

Electrical Connection

NOTENOTE

NOTE

The EPT202 was developed in accordance with applicable

EMC standards. To maintain the EMC characteristics, the

following points must be adhered to.

•Ensure that the EPT202 is properly grounded via the

grounding connection on the device.

•Use the shielded cables for the data and signal

connection from the EPT202 to other devices. Ground the

shield to the terminals provided for this purpose.

4.14.1

4.1 Supply VSupply V

Supply VSupply V

Supply Voltageoltage

oltageoltage

oltage

The EPT202 is equipped with a wide-range

input: 100 to 240 V AC or 100 to

353 V DC. Connect the supply voltage to

terminals 22 (42) L and 23 (41) N and the

grounding to terminal 21 (43) PE.

4.24.2

4.2 Sensor InputsSensor Inputs

Sensor InputsSensor Inputs

Sensor Inputs

The EPT202 can be operated with either a Pt100 or a 4-20mA

temperature sensor. In case, the ambient temperature is to be

recorded as well, a 4-20MA sensor must be used.

Measurement of the Top-Oil temperature is then achieved by

means of a Pt100 sensor.

4.2.14.2.1

4.2.1 Pt100-Signal (RTD) using 2 or 3 conductor wirePt100-Signal (RTD) using 2 or 3 conductor wire

Pt100-Signal (RTD) using 2 or 3 conductor wirePt100-Signal (RTD) using 2 or 3 conductor wire

Pt100-Signal (RTD) using 2 or 3 conductor wire

technologytechnology

technology

Sensor connection: Terminals 9 and 10

Equalizing line: Terminal 8

Shield: Terminal 7

Caution:Caution:

Caution: When using 2-conductor wire

technology, terminals 8 and 9 must be

jumpered!

Input Pt100

1098

BA 2076/02/01

4 Electrical connection

4.2.24.2.2

4.2.2 4 to 20 mA active Sensor I4 to 20 mA active Sensor I

4 to 20 mA active Sensor I4 to 20 mA active Sensor I

4 to 20 mA active Sensor I11

Input I1

has an internal voltage supply for a sensor with

4 to 20 mA output and no ownno own

no ownno own

no own voltage supply

(e.g., MT-ST160SK/TT)

Sensor connection (+): Terminal 12

Sensor connection (-): Terminal 13

Shield: Terminal 11

Caution:Caution:

Caution: Adhere to the maximum load of

the sensor and the circuiting.

4.2.34.2.3

4.2.3 4 to 20 mA passive Sensor I4 to 20 mA passive Sensor I

4 to 20 mA passive Sensor I4 to 20 mA passive Sensor I

4 to 20 mA passive Sensor I22

Input I2 is designed for a sensor with 4 to 20 mA output and

its ownown

ownown

own voltage supply (e.g., TT-PWM60).

Sensor connection (+): Terminal 13 (8),

Sensor connection (-): Terminal 14 (7),

Shield: Terminal 11 (10)

Supply voltage: 24 VDC ± 10%

Caution:Caution:

Caution: Adhere to the maximum load of

the sensor and the circuiting.

4.44.4

4.4 Analog OutputsAnalog Outputs

Analog OutputsAnalog Outputs

Analog Outputs

The analog outputs for oil and winding temperature can be

parameterized as desired to the following values.

•0 to 10 V

•0 to 1 mA

•4 to 20 mA (error signal < 3.6 mA)

•4 to 20 mA (error signal > 22 mA)

•0 to 20 mA (error signal > 22 mA)

The error signal is output on the analog output when the

input sensor is defective.

With the current outputs, the maximum load (total resistance

of the lines and connected devices) of 750 Wmay not be

exceeded. The internal voltage supply is 24 V DC +10%. When

a current output is not used, its terminals (+) and (-) must be

jumpered. Otherwise an error message is output.

When an analog output is parameterized to 0 - 10 V, this

must be loaded with at least 1 kW. The voltage output may not

be jumpered. An open or defective voltage output is not

detected.

Analog output 1 “Output Oil-TAnalog output 1 “Output Oil-T

Analog output 1 “Output Oil-Temp“emp“

emp“emp“

emp“

Line connection (+): Terminal 2

Line connection (-): Terminal 3

Shield: Terminal 1

The range of analog output 1 corresponds

to the input range of the sensor (refer to

nameplate), standard: -20 to +140 °C.

Example: 4 to 20 mA output:

4 mA corresponds to -20 °C

20 mA corresponds to +140 °C

Analog output 2 “Output Winding“Analog output 2 “Output Winding“

Analog output 2 “Output Winding“

Line connection (+): Terminal 5

Line connection (-): Terminal 6

Shield: Terminal 4

The range of analog output 2 is specified

on the nameplate (standard: 0 to +160 °C).

Example: 4 to 20 mA output:

4 mA corresponds to 0 °C

20 mA corresponds to +160 °C

4.54.5

4.5 Digital interfacesDigital interfaces

Digital interfacesDigital interfaces

Digital interfaces

To be able to parameterize the EPT202 with the visualization

software and call up the data, the EPT202 must be connected

via an interface with a PC. The following interfaces are

available for this purpose.

•RS 232

•RS 485 (bus-capability)

Input 4...20mA

1211

+I2

Output

Winding

Output

Oil Temp.

321

Input 4...20mA

14131211

+I2

RS 232RS 232

RS 232

To transmit data between a PC and the EPT202 via the RS

232 interface, connect the RS 232 interface of the PC (or an

interface converter) with a suitable 9-pin connection cable to

the sub D plug connector on the front of the device.

WARNINGWARNING

WARNING

High voltage, when the CT lines are disconnected and the

transformer is operating.

4.34.3

4.3 CT Input (Secondary CurrCT Input (Secondary Curr

CT Input (Secondary CurrCT Input (Secondary Curr

CT Input (Secondary Current Tent T

ent Tent T

ent Trr

ransformer)ansformer)

ansformer)ansformer)

ansformer)

Connect the lines of the CT transformer to

terminals 15 and 16.

If the EPT202 is equipped with a split core

transformer, then it must also be connected

to terminals 15 and 16.

This input can be deactivated during

parameter assignment so that only the oil

temperature is indicated, for example.

15 16

12 BA 2076/02/01

4 Electrical connection

RS485RS485

RS485

Data line A: Terminal 19 (2)

Data line B: Terminal 20 (1)

Ground connection: Terminal 18 (3)

Shield: Terminal 17 (4)

The RS 485 interface can be used to set up

a subsystem as shown in Fig. 4 with a

maximum of 32 devices.

The RS 485 interface uses a separate

company protocol. The description and

additional protocols are available on

request.

RS485

GND

A(+)

B(-)

20191817 Switching contacts ALARM and TRIPSwitching contacts ALARM and TRIP

Switching contacts ALARM and TRIPSwitching contacts ALARM and TRIP

Switching contacts ALARM and TRIP

These two switching contacts can be used

to generate an alarm message or trip the

transformer.

Connect the two relay contacts as required

for the application.

Error

42 43

Alarm

383736

ERROR contactERROR contact

ERROR contact

The ERROR contact is switched by the

internal self-monitoring function of the

device. (See chap. 5.4.)

When the device is in operation and there

is no device error, the contact is open

between terminals 42 (21)and 43 (22).

When there is a device error, the contact is

closed (fail-safe programming).

This contact can be used to generate an error message for

remote transmission. For a description of the self-monitoring

function of the device, see chapter 5.4.

4.64.6

4.6 Switching ContactsSwitching Contacts

Switching ContactsSwitching Contacts

Switching Contacts

Switching contacts S1 to S4Switching contacts S1 to S4

Switching contacts S1 to S4

The switching contacts S1 to S4 can be

used to switch on or off the individual

cooling stages of a transformer based on

the temperature.

Connect the lines of the fans/pumps to the

relay contacts for this.

262524

Parallel to the contacts, the EPT202 switches the cooling-

phase-specific winding parameters (for more details, see

chapter 5). This must be considered when connecting the

relays.

Fig. 5

GND A B

17 18 19 20

EPT202

RS485 address 2

120 Ohm

EPT202

RS485 address 32

17 18 19 20

GND A B

Konverter

RS485 / RS232

Schnittstellen

24VDC

RS232

RS485

120 Ohm

GND A B

17 18 19 20

EPT202

RS485 address 1

Interface converter

RS485 / RS232

BA 2076/02/01

5Function DescriptionFunction Description

Function DescriptionFunction Description

Function Description

5.15.1

5.1 Basic FunctionBasic Function

Basic FunctionBasic Function

Basic Function

The EPT202 is used to measure the temperature of

transformers or similar devices. The oil temperature is fed in to

the EPT202 via a temperature sensor. Internally the EPT202

calculates the thermal image (Hotspot temperature) in acc.

with IEC 354 or ANSI standard and indicates the oil and

winding temperature on its display.

The winding temperature (Hotspot) is calculated acc. to the

following equations:

Calculation acc. to IEC 354:

Calculation acc. to ANSI IEEE Std. C57.91:1995

Whereby: : Hotspot temperature

: Top-Oil temperature

: Hotspot factor

: Gradient of the average winding

temperature over average oil

temperature at rated current

: Gradient of the Hotspot temperature

over the Top-Oil temperature at rated

load

: Load factor (actual current / rated

current)

: Winding exponent

: Exponent for the calculation of the

actual Hotspot temperature

: Time constant of oil

If the calculation is to be done according to ANSI standards, a

Hotspot factor of 1,0 must be used and instead of the winding

exponent the appropriate ASNI exponent (2m) must be put in

to the equation.

5.45.4

5.4 Device Self-MonitoringDevice Self-Monitoring

Device Self-MonitoringDevice Self-Monitoring

Device Self-Monitoring

The EPT202 continuously monitors itself. The following errors

are detected by the device.

•Defective sensor

•Analog output 1 (oil temperature) open

•Analog output 2 (winding temperature) open

•Error of the supply voltage

When one of these errors has been detected, the ERROR

contact is closed, the ERROR LED goes on, the error is

indicated on the display and in the visualization software, and

the analog outputs (if current output) indicate the error signal.

CAUTIONCAUTION

CAUTION

When the device detects the error „sensor defective“ or an

error of the supply voltage, the switching contacts S1 to

S4 are closed and the ALARM and TRIP contacts retain

their current status.

5.55.5

5.5 Switching Contacts S1 to S4Switching Contacts S1 to S4

Switching Contacts S1 to S4Switching Contacts S1 to S4

Switching Contacts S1 to S4

The EPT202 is equipped with 4 relay contacts to activate fans

or pumps. These contacts can be turned on and off via the oil

or the winding temperature or, as an alternative, can be

turned permanently on by hand. The hysteresis and the delay

time of the contacts can be parameterized as desired.

The switching contacts S1 to S4 also switch the cooling-

phase-specific winding parameters.

5.65.6

5.6 Cooling-Phase-Specific Parameter RecordsCooling-Phase-Specific Parameter Records

Cooling-Phase-Specific Parameter RecordsCooling-Phase-Specific Parameter Records

Cooling-Phase-Specific Parameter Records

The winding parameters for 5 different cooling stages can be

stored on the EPT202 with the following values.

• Rated CT current

•Gradient gr

•Winding exponent y

•Winding time constant t

5 Function Description

⎟

⎠

⎞

⎜

⎝

⎛−×××+= −

rOilTopSpotHot eKgHθ(t)θ1

⎟

⎠

⎞

⎜

⎝

⎛−××+= −

H,ROilTopSpotHot eK∆θθ(t)θ1

TopOil

(t)θSpotHot

θ,

∆

5.25.2

5.2 Sensor InputsSensor Inputs

Sensor InputsSensor Inputs

Sensor Inputs

A Pt100 sensor or a sensor with an active or passive

4 to 20 mA output signal can be used as an input sensor. The

sensor type (Pt100 or 4 to 20 mA) must be parameterized by

the user.

Through the use of an optional 4 to 20mA sensor, the EPT202

can record and store the ambient temperature by means of a

data logging function. The Top-Oil temperature must then be

detected by a Pt100 sensor.

The temperature range of the oil temperature sensor input is

set to -20 to +140 °C (standard). Other temperature ranges are

also available on request. The temperature range is also used

to indicate the event of a defect sensor, which happens when

the temperature exceeds or drops below the admissible range.

When a sensor with 4 to 20 mA output signal is used, the

measuring range of the sensor output must comply to the

temperature range of the EPT202. Please check the nameplate

information.

5.3 Analog Outputs5.3 Analog Outputs

5.3 Analog Outputs

The basic device is equipped with one analog output each for

transmission of the oil temperature and the winding

temperature. The output signal can be parameterized. The

following output signals can be set as standard.

•0 to 20 mA (error signal > 22 mA)

•4 to 20 mA (error signal > 22 mA)

•4 to 20 mA (error signal < 3.6 mA)

•0 to 1 mA

•0 to 10 V

Additional output signals can be implemented with a signal

converter. The error signal is output when a defective sensor

or an open analog output is detected.

14 BA 2076/02/01

When cooling stage ONAF1 was active for another 100 hours,

the relays are then changed again.

The same principle applies when 3 or 4 cooling stages are

assigned to load change operation.

5.85.8

5.8 Switching Contacts ALARM and TRIPSwitching Contacts ALARM and TRIP

Switching Contacts ALARM and TRIPSwitching Contacts ALARM and TRIP

Switching Contacts ALARM and TRIP

The EPT202 is equipped with 2 additional switching contacts

to generate an alarm message and to trip the transformer. By

assigning parameters, these contacts can be assigned to the

oil or the winding temperature and the hysteresis and delay

time can be set.

5.95.9

5.9 Calculation of Life ConsumptionCalculation of Life Consumption

Calculation of Life ConsumptionCalculation of Life Consumption

Calculation of Life Consumption

The life consumption calculation can be configured with 2

algorithms (calculation as per ANSI or as per IEC standard) or

can be masked out.

Both algorithms are a function of the hotspot temperature.

The calculation can only supply a realistic value when the

winding parameters are assigned correctly.

Both algorithms supply the life consumption as a percentage

of the expected lifespan. The expected lifespan must be

parameterized for this.

NONO

NOTETE

TETE

The expected lifespan for the insulation system of a

transformer winding depends on the materials used and

the construction.

This value can be obtained from the manufacturer of the

transformer.

Calculation in accordance with ANSI standardCalculation in accordance with ANSI standard

Calculation in accordance with ANSI standard

C57.91-1995 (+errata)C57.91-1995 (+errata)

C57.91-1995 (+errata)

Recommended for transformers whose construction is

dominated by the US American standards ANSI or IEEE.

The cooling stages are called COOLING 0 to COOLING 4 on

the EPT202. The parameter record of the last cooling stage is

always active and thus provides the basis for the calculation

of the winding temperature and life management

consumption.

The parameter records of the cooling stages are linked with

the switching contacts as shown below.

•No switching contact switched - COOLING 0 active

•Switching contact S1 switched - COOLING 1 active

•Switching contact S2 switched - COOLING 2 active

•Switching contact S3 switched - COOLING 3 active

•Switching contact S4 switched - COOLING 4 active

5.75.7

5.7 Load Change OperLoad Change Oper

Load Change OperLoad Change Oper

Load Change Operationation

ationation

ation

The load change function permits the fans or pumps

connected to the switching contacts to be loaded equally.

Each switching point can be individually assigned to load

change operation. During load change operation the relays of

the assigned switching contacts are switched in sequence

after the adjustable load change internal has expired. The LED

display and the winding parameters of the active cooling

stage remain as they were before.

The load change function will now be explained using the

following example.

Cooling stage 1 of a transformer is ONAF1. The left fan group

is turned on with switching point S1 and the related

parameter record of the COOLING1 cooling stage is activated.

Cooling stage 2 is ONAF2. The right fan group is switched

through with switching point S2 and the related parameter

record of the COOLING2 cooling stage is activated.

Without load change operation, the runtime of the left fan

group (active during COOLING1 and COOLING2) would be

greater than that of the right fan group (only active during

COOLING2).

Switching points S1 and S2 are now assigned to the load

change operation and a load change interval of 100 hours is

parameterized. If cooling stage ONAF1 was now active for a

total of 100 hours (the left fan group has run 100 hours

alone), switching contacts S1 and S2 then change the relays.

Switching contact S1 now switches with the actual relay of

switching contact S2 and vice versa. This turns off the left

fan group and turns on the right fan group. The status of the

LED display and the parameter record of the active cooling

stage (COOLING1 in our example) are not affected by this.

When activation is performed by switching point S2 (ONAF2

or COOLING2), then S2 switches the left fan group through

with the actual relay of S1.

5 Funktion Description

CAUTIONCAUTION

CAUTION

The calculation of life consumption of the EPT202 is based

on the thermal aging of a transformer winding in

accordance with ANSI or IEC standards. Remember that

the value calculated here may not reflect actual

conditions.

Life consumption only refers to the insulation system of a

transformer winding and not to the complete transformer.

BA 2076/02/01

Calculation in accordance with IEC 354,Calculation in accordance with IEC 354,

Calculation in accordance with IEC 354,

second edition 1991-9second edition 1991-9

second edition 1991-9

Recommended for transformers whose construction was

based on IEC standards.

With this calculation algorithm, the EPT202 places relative

thermal rate of aging as per IEC 354 in relation to the

expected lifespan and calculates the life consumption as a

percentage (like the ANSI standard).

5.105.10

5.10 Data LoggingData Logging

Data LoggingData Logging

Data Logging

The EPT202 is equipped with an internal memory in which

data are stored. The time interval between storage (data

logging) of two data records can be parameterized as desired.

In addition, data sets are also stored when the following

events occur:

• Power supply - on / off

• Test mode - activated / deactivated

• Trip - activated / deactivated

• Alarm - activated / deactivated

• Device error - activated / deactivated

• Switching contacts (S1 to S4) - activated / deactivated

• Device lock - locked / unlocked

The data memory can hold a total of approx. 32,000 data

records. At an interval of 10 minutes, this means that data

covering a period of approx. 7.5 months can be stored.

The data records can be loaded with the visualization

software and evaluated with an Excel spreadsheet. A data

record contains the following information.

•· Set no.

•Date

•Time

•Device status with status indication of the switching

contacts and all relevant device data

•Event (is usually not used)

•Error code with status indication of the individual errors

•Oil temperature

•3 winding temperatures (winding temperature 1 for basic

device, winding temperature 2 and 3 only with appropriate

extra module)

•Load current (load current 1 for basic device, load current

2 and 3 only with corresponding extra module)

•Life consumption

•Oil level of the oil conservator of the transformer tank

(only with corresponding extra module)

•Oil level of the oil conservator of the OLTC/LTC (only with

corresponding extra module)

•3 in reserve (not usually used)

5.15.1

5.111

1Masking Out the Winding TMasking Out the Winding T

Masking Out the Winding TMasking Out the Winding T

Masking Out the Winding Temperemper

emperemper

emperaturatur

aturatur

aturee

When the EPT202 is only used to indicate the oil temperature

and to control the switching contacts via the oil temperature,

the simulation of the thermal image (winding temperature)

can be masked out with the <Winding off> function.

The following functions are then deactivated.

•CT input

•Analog output 2 (winding temperature)

•Life consumption calculation

•Parameterization of the winding parameters for the device

and the visualization software

•All menu items on the device and all setting options in the

visualization software which are related to the winding

temperature

The menu items which are masked out with this function are

marked in the short operating instructions with an

asterisk (*).

5 Function Description

16 BA 2076/02/01

6 Operation

6OperOper

OperOper

Operationation

ationation

ation

6.16.1

6.1 FrFr

FrFr

Front plateont plate

ont plateont plate

ont plate

The design of the front plate is the same for all 4 models (refer

to Fig. 4) whereby, the connection terminals of the EPT202 for

control panel mounting and 19" subrack assembly are at the

rear. The SPI-Bus connection is located internally.

The menus, measured values and parameters are indicated on

the 8-line LCD display.

The 5 operator keys can be used to switch between the

individual menus, change parameters and reset measured

values.

With a suitable cable, the device can be connected via the

sub D plug to a PC for parameterization or for data

transmission.

The SPI bus on the side can be used to connect extra modules

such as the CT with 2 extra CT inputs.

The status LEDs signal the following operating states.

•Green POWER LED on: Device is running.

Green POWER LED flashing: Key lock released.

•Yellow ALARM LED on: ALARM contact is tripped.

•Red TRIP LED on: TRIP contact is tripped.

•Red ERROR LED on: Device error

•Yellow LED S1 to S4 on: Specific contact S1 to S4 was

tripped and the related parameter record is activated.

6.26.2

6.2 Menu PrMenu Pr

Menu PrMenu Pr

Menu Promptingompting

omptingompting

ompting

The 5 operator keys can be used to indicate the set

parameters and measured values.

The parameters cannot be changed until the key lock is

released.

The entire menu structure and prompting can be found in the

included short operating instructions.

Temperature indication modeTemperature indication mode

Temperature indication mode

When in operation the device is always in

temperature indication mode. When a

menu item is selected and no key is

pressed on the device for 30 seconds, a

change is automatically made to the

higher-level menu or to temperature

indication mode.

Messwertanzeige

OILOIL-T-TEMEMPP

6565,8,8 °°CC

WINWINDIDINGNG-T-TEMPEMP

7474,2,2 °°CC

Fig. 6

122

633

344

455

Messwertanzeige

OIL

-T

WIN

-T

EMP

Messwertanzeige

OIL

-T

WIN

-T

EMP

166

633

344

1 - Status-LED’s 4 - Operator keys

2 - Connection terminals 5 - SPI-Bus for add-on modules

3 - LCD display 6 - D-Sub-Stecker für RS232

BA 2076/02/01

When a device error occurs, this is

indicated in the bottom line of

temperature indication mode.

The following errors are indicated.

<Sensor Defect> Either the sensor is defective (e.g., line

break) or the wrong sensor type was

selected during parameterization.

<Oil-Analog open> The device connected to the output

<Output Oil Temp.> is defective or not

correctly connected.

When this output is not used, jumper

terminals 2 and 3.

<Wind-Analogopen>

The device connected to the output

<Output Winding> is defective or is

not wired correctly.

When this output is not used, jumper

terminals 5 and 6.

<Power Down> The supply voltage is too low. Check the

source of voltage and the wiring.

Releasing the key lock and keyReleasing the key lock and key

Releasing the key lock and key

code changecode change

code change

In the temperature indication

mode, press the keys <UP> and

<DOWN> simultaneously.

As a result, a mask opens for

key code entry. The key code

entry is made by using the 4

direction keys (factory set at

1111). When this is done

successfully, the green power LED flashes and the key lock is

released. If after 60 a period of 60seconds, no further key is

pressed, the key lock is automatically locked again.

The key code can be changed

when the key lock is unlocked.

By pressing the the keys <UP>

and <DOWN> simultaneously,

the mask <Change Key-Code>

appears, enabling a change to be made by means of the 4

direction keys and finally confirmed by pressing the <Enter>

key.

Changing to the menu levelChanging to the menu level

Changing to the menu level

To change from the temperature indication mode to the menu

level (jump to the main menu <PEAK VALUES>), press the

<ENTER> key.

Messwertanzeige

OIL

-T

WIN

-T

EMP

Changing the main menuChanging the main menu

Changing the main menu

The main menus are arranged

inrings.The <LEFT> or <RIGHT>

key can be used to select the

appropriate menu.

Selecting a menu itemSelecting a menu item

Selecting a menu item

The <UP> and <DOWN> keys

can be used to highlight an

individual menu item.

Selection is done using the

<ENTER> key.

To return to temperature indication mode, the title of the main

menu must be highlighted. When the menu title is selected,

press the <ENTER> key.

Functions of the menu itemsFunctions of the menu items

Functions of the menu items

When the submenu is only

used for indication or no

parameter is changed, the

<ENTER> key can be used to

jump from the menu to the

higher-level menu.

To change a parameter,

change it with the <UP> or

<DOWN> key and confirm

with<ENTER>.

The MIN and MAX values can

be reset by use of the <UP>

and <DOWN> keys. Any

changes must be confirmed

using the option <YES>. The

peak value is then over-

written by the momentary value.

When a menu item has

submenus itself, the title

must be selected to change

to the higher-level menu

(<UP> or <DOWN>) and

confirmed with <ENTER>.

6 Operation

Change Key Code

Change Key-Code

2636___

Save ?

YES NO

Messwertanzeige

OIL

-T

WIN

-T

EMP

Ent

-Co

2536

Main

<-PEAK-VALUES- >

Max. Oil-Temp.

Min. Oil-Temp.

Max.Winding-Temp

Min.Winding-Temp

Max.Load-Current

Max.Ambient-Temp

Min.Ambient-Temp

or +

Main-Selected

<-PEAK-VALUES- >

Max. Oil-Temp.

Min. Oil-Temp.

Max.Winding-Temp

Min.Winding-Temp

Max.Load-Current

Max.Ambient-Temp

Min.Ambient-Temp

Load Factor

_Lo

-F

tor

(

0,6

3__

Min. Oil-Temp.

- 12,2 °C____

Save ?

YES NO

or +

-CONTACT S1-

Description

Configuration

Switch-Point

Hysteresis

Delay-Time

Alternate_

or +

Offset Correction

Off

rre

2,5

YES

or +

18 BA 2076/02/01

7 Indication and Parameterization

7Indication and PIndication and P

Indication and PIndication and P

Indication and Parar

arar

arameterizationameterization

ameterizationameterization

ameterization

A description now follows of the individual menus and

parameters which appear on the display of the device and

which can be parameterized via the operator buttons.

Parameterization of the EPT202 via the visualization software

is described in chapter 8.

The memory for date and time is retained for approx. 2 weeks

without power. After this time, these data will be lost.

When the device is connected for the first time or is powered

up after approx. 2 weeks without power, the current date and

the current time must be set. The device jumps automatically

to this menu item.

Correct functioning of the EPT202 is not ensured unless the

device is completely parameterized.

The following description of the individual menu items is

based on the order in which they appear during

parameterization. However, the menus are arranged so that

during operation the user can access the most important

menus quickly. For the menu structure, see the short

operating instructions.

7.17.1

7.1 Input and Output ConfigurationInput and Output Configuration

Input and Output ConfigurationInput and Output Configuration

Input and Output Configuration

This menu can be used to configure the

inputs and outputs and to mask out the

calculation of the winding temperature.

Sensor inputSensor input

Sensor input

The input sensor can be selected in this

menu. Please also abide to the information

on page 13 of chapter 5.2.

Parameterization of the analog outputsParameterization of the analog outputs

Parameterization of the analog outputs

The analog outputs for the oil and the

windinging temperature are parameterized

in this menu.

For more information regarding analog

outputs, please refer to page 13 of chapter 5.3.

Recording of the ambient temperatureRecording of the ambient temperature

Recording of the ambient temperature

In this menu item the recording of the

ambient temperature can be activated. For

more information on this function, please

refer to page 13 of chapter 5.3.

Only the 4 to 20mA input can be used as an input sensor for

ambient temperature. A Pt100 sensor must be used for the

input of the Top-Oil temperature. The sensor input is then

automatically parameterized for Pt100

Masking out the winding temperatureMasking out the winding temperature

Masking out the winding temperature

The winding temperature can be masked

out in this menu. For more information,

please refer to page 15 of chapter 5.11.

7.2 Winding-Specific Parameters7.2 Winding-Specific Parameters

7.2 Winding-Specific Parameters

The winding-specific parameters are

entered in this menu. These values provide

the basis for the calculation of the winding

temperature and life management.

Main

< -

NFI

G-

Oil

-T

Inp

.Ou

Amb

Win

n/O

Win

.Ou

Oil Temp Input

Oil

-T

Inp

4-2

0 mA

PT1

YES

Winding On/Off

Winding On

Winding Off

Save ?

YES NO

< -WINDING- >

CT-Ratio__

Hotspot-Fact.(H)

Cooling 0_

Cooling 1_

Cooling 2_

Cooling 3_

Cooling 4_

NOTENOTE

NOTE

For the values of the winding parameters, please refer to

the transformer documentation or contact the

manufacturer. These values must be correctly entered since

they provide the basis for the internal calculations.

CT-Ratio

CT-

o__

100

0:1

YES

Current transformer ratio <CT-Ratio>Current transformer ratio <CT-Ratio>

Current transformer ratio <CT-Ratio>

This menu item is used to parameterize the ratio of the CT

current transformer. The EPT202 is fed by the CT current

transformer so that it can image the load of the transformer.

The actual load current is calculated from

the current transformer ratio and the

actual CT current.

Parameterizing the hotspot factor (H)Parameterizing the hotspot factor (H)

Parameterizing the hotspot factor (H)

This parameter is an empirical value with which the hotspot

temperature according toIEC354 is determined. It depends on

the size of the transformer, the short-circuit impedance as well

as other factors.

When this parameter is set to 1.0, then

according to IEC354 the average

temperature of the upper winding layer is

calculated and indicated. For calculations

according to ANSI standards, the value

must be set at 1,0 because it is not used in the calculation.

Hotspot-Fact.

Hot

-F

act

1,2

Sav

e ?

YES

Oil Temp Output

Oil-Temp.Output

0-10 V______

0-1 mA____

4-20 mA (>22)

4-20 mA (<3,6)

4-20 mA (>22)

Save ?

YES NO

Amb.Temp.

Amb.Temp. On/Off_

Ambient-Temp On_

Ambient-Temp Off

Save ?

YES NO

BA 2076/02/01

7 Indication and Parameterization

Parar

arar

arameterizing the cooling-phase-specific windingameterizing the cooling-phase-specific winding

ameterizing the cooling-phase-specific windingameterizing the cooling-phase-specific winding

ameterizing the cooling-phase-specific winding

parpar

parameterameter

ameterameter

ameterss

This menu item can be used to

parameterize all winding parameters of

the cooling stage <Cooling 0>.

Parameterization of the cooling stages

<Cooling 1> to <Cooling 4> is similar.

For more information on linking the winding parameters with

the switching contacts, see page 13 in chapter 5.6.

Rated CT currentRated CT current

Rated CT current

The rated CT current is the value of the

CT output at the rated load of the

transformer. This can be set in this menu

item for every cooling stage between 0.5

and 5.0 A.

The rated CT current is calculated from the rated current of

the transformer (this may depend on which cooling stage is

active) divided by the ratio of the CT transformer.

Example: Rated current of transformer IN: 820A

CT ratio R: 1000 : 1

ICT = IN/ R = 820A / 1000 = 0.82A

GrGr

Gradient (gr)adient (gr)

adient (gr)adient (gr)

adient (gr)

The gradient specifies the difference

between oil and winding temperature at

the rated load. If, for example, a gradient

of 26 K is set and the transformer is

operated at rated load, then the average

winding temperature (Hotspot factor 1,0) is 26 K higher than

the oil temperature. If the transformer has been off for some

time, the winding temperature is the same as the oil

temperature.

The value of the gradient may differ for the individual cooling

stages.

Winding exponent yWinding exponent y

Winding exponent y

The winding exponent can be set within a

range of 1.0 to 2.0.

IEC 60354 specifies the following values

for different types of cooling.

Cooling ON… Y = 1.6

Cooling OF… Y = 1.6

Cooling OD… Y = 2.0

For calculations to ANSI standards, the value of y to be

applied, is the result of (2xm). According to ANSI standards,

the values for m range from 0,8 to 1,0.

Rated Current 0_

2,00 A__

Save ?

YES NO_

Gradient

Gra

gr)

26,

Sav

e ?

YES

Winding Expo. 0_

1,6___

Save ?

YES NO_

Time Constant 0_

8min

Save ?

YES NO_

Time constantTime constant

Time constant tt

A sudden change of the load current does

not result in a sudden change of the

winding temperature. The winding

temperature approaches its actual final

value according to an e-function (please

refer to page 13 ). Due to a sudden rise of load current the

winding temperature will reach 63,5% of the peak value after

a duration of tt

tand 95% of the peak value after a duration of

3t.t.

t.t.

Since the time constant can be different for each cooling

stage, it can be set individually from 0.0 to 30.0 minutes for

each cooling stage.

7.37.3

7.3 Switching ContactsSwitching Contacts

Switching ContactsSwitching Contacts

Switching Contacts

This menu can be used to set and

configure the switching points S1 to S4,

ALARM and TRIP.

Load change intervalLoad change interval

Load change interval

This menu item can be used to

parameterize the load change interval.

Setting the value to 0 here deactivates

the load change interval.

Menu for switching points S1 to S4, ALARM and TRIPMenu for switching points S1 to S4, ALARM and TRIP

Menu for switching points S1 to S4, ALARM and TRIP

Switching points S1 to S4 are designed

for the control of fans, for example, or

pumps. The ALARM switching point

generates an alarm message and the TRIP

switching point is used to trip the

transformer.

Parameterization of the individual switching points is the same

except that the submenus <Description> and <Alternate> are

omitted for the two switching points ALARM and TRIP.

The menu item <Description> indicates the designation of the

switching point. This can only be entered via the visualization

software.

Configuring the switching pointConfiguring the switching point

Configuring the switching point

Control of the switching points can be

configured in different ways.

· With <Manual OnManual On

Manual OnManual On

Manual On>.Theswitching

contact is set to continuous operation.

This setting cannot be made for the

switching points ALARM and TRIP.

· With <Oil-Temp.Oil-Temp.

Oil-Temp.Oil-Temp.

Oil-Temp.>. The switching contact is activated via

the oil temperature.

· With <Winding-Temp.Winding-Temp.

Winding-Temp.Winding-Temp.

Winding-Temp.>. The switching contact is activated

via the winding temperature.

<-SWITCH-POINT->

Altern.-Interval

Contact S1

Contact S2

Contact S3

Contact S4

Contact ALARM

Contact Trip

Altern.-Interval

Alt

-I

nte

Sav

e ?

YES

Configuration

Con

Man

l On

Oil

-T

Win

-T

emp

Sav

e ?

YES

-Cooling 0-_

Rated Current_

Gradient(gr)

Winding Exponent

Time Constant_

-CONTACT S1-

Description

Configuration

Switch-Point

Hysteresis

Delay-Time

Alternate_

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