Novatek UBZ-304 User manual

NOVATEK-ELECTRO LTD
Intelligent Industrial Electronics
UNIVERSAL MOTOR PROTECTION
UNIT
UBZ-304
OPERATING MANUAL

Quality control system on the production complies with requirements ISO 9001:2008
Dear customer,
Company NOVATEK-ELECTRO LTD. thanks you for purchasing our products.
You will be able to use properly the product after carefully studying the Operating Manual.
Keep the Operating Manual throughout the service life of the product.
www.novatek-electro.com
www.novatek-electro.in
Dear customer,
You will be able to use properly the product after carefully studying the Operating Manual.
Keep the Operating Manual throughout the service life of the product.

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UBZ-304 NOVATEK-ELECTRO
CONTENT
1 APPLICATION .....................................................................................................................................................................5
1.1 General.........................................................................................................................................................................5
1.2 Changes in the Characteristics and Operation of UBZ Depending on Program Version ............................................6
1.3 Controls and Overall Dimensions.................................................................................................................................6
1.4 Operating Conditions....................................................................................................................................................6
2 COMPONENTS ...................................................................................................................................................................6
3 SPECIFICATIONS...............................................................................................................................................................7
3.1 Basic Technical Specifications.....................................................................................................................................7
3.2 Measured, calculated, special and service parameters ...............................................................................................8
3.3 Programmable Parameters ........................................................................................................................................10
3.4 Protection Functions...................................................................................................................................................17
3.4.1 Protection Types .................................................................................................................................................17
3.4.2 Maximum phases current protection...................................................................................................................17
3.4.3 Ground fault protection:.......................................................................................................................................18
3.4.4 Negative-sequence current protection (imbalance) ............................................................................................18
3.4.5 Minimum phase current protection:.....................................................................................................................18
3.4.6 Delayed start and rotor blocking .........................................................................................................................18
3.4.7 Thermal overload protection ...............................................................................................................................19
3.4.8 Windings overheating protection.........................................................................................................................20
3.4.9 Voltage protection ...............................................................................................................................................20
3.4.10 Phase sequence protection...............................................................................................................................20
3.4.11 Network power frequency drop protection ........................................................................................................20
3.4.12 Network power frequency rise protection..........................................................................................................20
3.4.13 Protection for minimum resistance of motor winding insulation........................................................................20
3.4.14 Protection for the motor phase (-s) break (loss) ...............................................................................................21
3.4.15 Serviceability check of external magnetic starter..............................................................................................21
4 UBZ DESIGN.....................................................................................................................................................................21
5 INTENDED USE ................................................................................................................................................................21
5.1 Preparation for operation............................................................................................................................................21
5.1.1 Preparation for connection:.................................................................................................................................21
5.1.2 Selection of Current Transformers (CT)..............................................................................................................21
5.1.3 General................................................................................................................................................................21
5.1.4 Unit Installation....................................................................................................................................................22
5.1.5 UBZ-304 connect ................................................................................................................................................23
5.2 UBZ Control................................................................................................................................................................24
5.2.1 Modes of UBZ control and status........................................................................................................................24
5.2.2 Measured and calculated parameters view state................................................................................................24
5.2.3 Mode of ‘Keyboard blocking’ ...............................................................................................................................25
5.2.4 Mode of ‘Minimum number of settings’ (MNS)....................................................................................................25
5.2.5 Mode of ‘User level’.............................................................................................................................................25
5.2.6 Mode of “Advanced user level” ...........................................................................................................................26
5.2.7 Factory settings...................................................................................................................................................27
5.2.8 Real time setting..................................................................................................................................................27
5.2.9 UBZ faults reset on front panel ...........................................................................................................................27
5.2.10 Energy meters reset..........................................................................................................................................27
5.3 UBZ Operation............................................................................................................................................................28
5.3.1 UBZ operation before load relay on....................................................................................................................28
5.3.2 UBZ operation after load relay enabling and motor is on....................................................................................28
5.3.3 Functional relay operation...................................................................................................................................28
5.4 Operation of UBZ-304 together with computer...........................................................................................................29
5.4.1 Communication protocol and interface ...............................................................................................................29
5.4.2 Communication parameters:...............................................................................................................................29
5.4.3 Communication protocol .....................................................................................................................................30
5.4.4 Command codes.................................................................................................................................................30
5.4.5 Control of correct transmission of data packet....................................................................................................32
5.4.6 Register addresses .............................................................................................................................................33
5.4.7 Time parameter registers....................................................................................................................................33
5.4.8 Communication errors handling..........................................................................................................................34
5.4.9 Remote control of the motor using RS-232/RS-485 interface ............................................................................34
5.4.10 Command "FAULT RESET"..............................................................................................................................35
5.4.11 Command "UBZ RESTART" ("RESTART")......................................................................................................35
5.4.12 UBZ factory settings using MODBUS interface ................................................................................................35
5.5 Emergency Conditions System ..................................................................................................................................35
5.6 Emergency Conditions Logbook ................................................................................................................................36
5.7 Motor control on UBZ front panel ...............................................................................................................................37
5.8 Motor control using analog inputs ..............................................................................................................................37

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NOVATEK-ELECTRO UBZ-304
6 MAINTENANCE.................................................................................................................................................................37
6.1 Safety precaution........................................................................................................................................................37
6.2 Maintenance Procedure: ............................................................................................................................................37
7 TRANSPORTATION AND STORAGE ..............................................................................................................................38
8 SERVICE LIFE, SHELF LIFE AND MANUFACTURER WARRANTY...............................................................................38
9 ACCEPTANCE CERTIFICATE..........................................................................................................................................38
10 CLAIMS DATA.......................................................................................................Ошибка! Закладка не определена.
Appendix А............................................................................................................................................................................39
CURRENT PROTECTION WITH DEPENDENT TIME DELAY
Appendix В............................................................................................................................................................................41
UBZ OPERATION FOR MOTOR CONTROL WITH WINDING CHANGEOVER WHEN STAR-TO-DELTA STARTING

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UBZ-304 NOVATEK-ELECTRO
ATTENTION! ALL REQUIREMENTS OF THIS OPERATING MANUAL ARE COMPULSORY TO BE MET!
ATTENTION! THE DEVICE IS NOT INTENDED TO BE USED FOR LOAD COMMUTATION IN CASE OF
SHORT CIRCUITS. THEREFORE THEY SHOULD BE PROTECTED BY AUTOMATIC CIRCUIT BREAKERS
(FUSES).
The fuse rating is selected according to the connected circuits, but it should not exceed for contacts 13-15 is
15 A, for contacts 16-21 –6.3 A).
WARNING! –PRODUCT TERMINALS AND INTERNAL COMPONENTS ARE UNDER
POTENTIALLY LETHAL VOLTAGE
TO ENSURE THE PRODUCT SAFE OPERATION IT IS STRICTLY FORBIDDEN THE
FOLLOWING:
TO CARRY OUT MOUNTING WORKS AND MAINTENANCE WITHOUT DISCONNECTING THE
PRODUCT FROM THE MAINS;
TO OPEN AND REPAIR THE PRODUCT INDEPENDENTLY;
TO OPERATE THE PRODUCT WITH MECHANICAL DAMAGES OF THE CASE.
IT IS NOT ALLOWED WATER PENETRATION ON TERMINALS AND INTERNAL ELEMENTS OF THE
PRODUCT.
During operation and maintenance the regulatory document requirements must be met, namely:
Regulations for Operation of Consumer Electrical Installations;
Safety Rules for Operation of Consumer Electrical Installations;
Occupational Safety when in Operation of Electrical Installations;
Installation, adjustment and maintenance of the product must be performed by qualified personnel having
studied this Operating Manual.
In compliance with the requirements of this Operating Manual and regulations the product is safe for
use.

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NOVATEK-ELECTRO UBZ-304
This Operating Manual is intended to familiarize you with the unit, the requirements for safety, operation and
maintenance procedures of the universal motor protection unit of UBZ-304 (hereinafter referred to as UBZ).
The product meets the requirements:
UBZ complies with the requirements of the following international standards:
–IEC 60947-1, Low-voltage Switchgear and Control-gear; Part 1: General Rules;
–ІEC 60947-6-2:1992, Low-voltage switchgear and control gear –Part 6-2: Multiple function equipment - Control and
protective switching devices (or equipment)
–CISPR 11:2004, Industrial, scientific and medical (ISM) radio-frequency equipment - Electromagnetic disturbance
characteristics –Limits and methods of measurement
–IEC 61000-4-2:2001, Electromagnetic compatibility (EMC) –Part 4-2: Testing and measurement techniques –
Electrostatic discharge immunity test
Note: The product characteristics comply with both international standards and corresponding national
standards.
Harmful substances in amounts exceeding maximum permissible concentrations are not available.
Abbreviations and terms:
ARS –Automatic restarting;
MS –Magnetic starter;
PC- Personal computer;
CТ - Current transformer;
LCD –Liquid crystal display;
MNS - Minimum number of settings (it is used in phrases as MNS mode or MNS list);
Iсt - Rated current of CT (it is set when external CTs using; e.g., if CТis of Т-0.66 300/5 type, then Iсt
equals to 300A);
In –Rated current of the motor; As a rule, this value of current is indicated on the motor nameplate, but
depending on the operating conditions, the different value of current can be set;
s.c. –short circuit.
1 APPLICATION
1.1 GENERAL
UBZ-304 is designed for protection of induction motors with power of 2.5 to 315 kW in case of using the
external standard current transformers with 5A output current.
UBZ can be operated in networks both with insulated and dead grounded neutral.
The unit is of DIN rail design version.
UBZ provides continuous monitoring of mains voltage parameters, current values of the phase (line) currents
of three-phase electrical equipment for 415V, 50Hz, and checking the resistance values of motor insulation.
UBZ provides protection of electrical motors in case of:
-low-quality network voltage (unacceptable power surges, phase failure, incorrect phase sequence and
phase "coincidence", the imbalance of phase/line voltages, the reduction in the network frequency lower than the
set one and (or) the increase of network frequency higher than the set value);
-mechanical overloads (symmetrical overload in phase/line currents);
-the threshold crossing of the negative-sequence current;
-unbalance of phase currents without overload associated with the insulation fault inside motor and/or the
power cable (the comparison of current unbalance factor according to inverse sequence with voltage unbalance
factor according to inverse sequence);
-the torque failure on the motor shaft ("dry running" for pumps) –protection based on the minimum starting
and/or operating current;
-motor delayed start or rotor blocking;
-extremely low isolation between the stator and the motor housing (pre-startup check);
-ground fault of the stator winding during operation –ground leakage current protection;
-motor thermal overload;
-overheated windings (temperature of windings is determined using the motor built-in temperature
transmitters or the temperature of the housing when using the external temperature transmitters).
For each type of protection it is possible to have banning and permitting of automatic restarting (hereinafter
referred to as ARS) with load.
UBZ provides for electric equipment protection by means of controlling the coil of the magnetic starter
(contactor).
UBZ detects motor currents when load relay is off (when the load relay is off and functional relay is in star-delta
mode). In this case, UBZ indicates the fault of external contactor starting the motor until UBZ is turned off or control
of motor currents is disabled when load relay is off.
UBZ provides for electric motors control:
- using analog inputs "0-20 mA" and "0-10 V";

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UBZ-304 NOVATEK-ELECTRO
- using remote control channels (RS-232 and RS-485 interfaces);
- by buttons on the front panel of UBZ.
Communication
UBZ provides:
- parameters control and transmission by RS-485 interface using MODBUS Protocol,
- parameters control and transmission by RS-232 interface.
Note: Simultaneous use of RS-485 and RS-232 is not possible.
For UBZ operation with PC the program of UBZ-304/305 Control Panel can be used; it is available on the
website of NOVATEK-ELECTRO Company (http://www.novatek-electro.com/production_ubz.htm).
UBZ-304/305 Control Panel program is designed to monitor the status and collect data of the UBZ-304 unit via
RS-232 or RS-485 communication interfaces (MODBUS Protocol). The program allows for saving (loading) various
UBZ settings, retrieving data and save them for further analysis. Data saved can be viewed in the graphs,
comparing the parameters with each other.
Graphic interface of the control panel allows real-time viewing the current status of various UBZ parameters. The
flexible adjustment of interface allows adapting to the needs of any user.
1.2 CHANGES IN THE CHARACTERISTICS AND OPERATION OF UBZ DEPENDING ON PROGRAM
VERSION
If the software version is 5 or less, then changes in UBZ characteristics and operation are not available.
Version 7: metering of total, active and reactive energies is added.
Version 8: integrity control of voltages and currents calibration factors is added.
Version 9: control algorithms by the engine on analog inputs are added.
1.3 CONTROLS AND OVERALL DIMENSIONS
Overall dimensions of UBZ are given in Fig.1.1.
1.4 OPERATING CONDITIONS
UBZ is designed for operation in the following conditions:
Ambient temperature: from minus 20 to +55°С;
Atmospheric pressure: from 84 to 106.7 kPa;
Relative air humidity (at temperature of +25°С): 30 … 80%.
Note: It is allowed UBZ operation at temperatures from minus 35 to minus 20°С; in this case the readings on display
can be not available.
ATTENTION!
The product is not intended for use:
- in conditions of significant vibration and shocks;
- in high humidity conditions;
- in corrosion environments with content in the air of acids, alkalis, etc., as well as severe contamination
(grease, oil, dust, etc.).
If the temperature of the unit after transportation or storage is different from the temperature of the
environment in which its operation is assumed, then before connecting to the mains keep the unit in operation
conditions for two hours (because on the unit elements condensation may be available).
2 COMPONENTS
Delivery set is given in Table 2.1.
Table 2.1 –Delivery Set
Description
QTY
UBZ-304 Unit
1
Differential transformer (zero sequence transformer) TP-5-45*
1
Cable for communication with PC via RS-232 (type - КС-01)**
1
Temperature transmitter (types: Pt100, Ni100, Ni120) **
1
Fasteners
2
Rubber gasket
1
*current transformers, “Novatek-Electro” production: ТР-7-5-100, ТР-7-5-120, ТР-7-5-150 and other, is
delivered upon agreement with the Customer.
** it delivered upon agreement with the Customer

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NOVATEK-ELECTRO UBZ-304
1 –LCD
2 –Green LED MMSP is on when the relay is in MNS mode;
3 - Green LED Func relay is on when functional relay is on;
4 - Green LED is on when UBZ functional relay operates in start-delta mode (it.2.5.3);
5 –Blue LED EXCHANGE is on when data exchange with PC occurs;
6 –Red LED FAULT:
- when load relay is off: it is on when UBZ is in fault conditions (it flashes if after fault ARS is expected);
- when load relay is on: it flashes when the motor is in conditions of over-current or thermal overload but relay off
time has not come yet;
7 –Green LED TR is on when UBZ functional relay operates in time-delay relay mode;
8 - Green LED Power relay:
- it is on when load relay is on;
- it flashes if UBZ is within hysteresis band when controlling using analog inputs;
9 –Red LED SETUP is on when UBZ is in the mode of parameters setting;
10 - Button (UP) is scrolling of displayed parameters in the parameter view mode and scrolling of the menu in the
parameters setting mode;
11 - Button (DOWN) is scrolling of displayed parameters in the parameter view mode and scrolling of the menu in
the parameters setting mode;
12 - Button RES/MEM/SEL is the parameters recording in the setting mode, switching over the group of displayed
parameters in the view mode, reset;
13 - Button SETUP turns on the parameters setting mode;
Figure 1.1 –Controls and Overall Dimensions of UBZ
3 SPECIFICATIONS
3.1 BASIC TECHNICAL SPECIFICATIONS
Basic technical specifications of UBZ are given in Tables 3.1 and 3.2; specifications of contacts of built-in relays
are shown in Table 3.3.
Table 3.1 –General Data
Description
Unit of
measure-
ment
Value
Application of the unit
-
Switchgear and control-gear;
induction motor protection control;
Design (installation) type
DIN rail 35 mm
Protection rating of front panel
-
IP64
Protection rating of housing
IP10
Climatic version
NC 3.1
Contamination level
II
Overvoltage category
II
Rated voltage of insulation
V
450
Rated impulse withstand voltage
kV
2.5
Electric shock protection class
II
Wire cross section for connection to terminals
mm2
0.5-2
Torque for terminal screws
N*m
0.4

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UBZ-304 NOVATEK-ELECTRO
Table 3.2 –Technical Specifications
Description
Value
Operating supply voltage, three-phase
415 V, 50 Hz
Mains frequency, Hz
48-62
Rated current of CT, A
5
(Phase/line) voltage hysteresis, V
10/17
Heat hysteresis, in % of accumulated heat in case of shutdown
33
Determination accuracy of trip threshold for current, not more, in % of rated value
2
Determination accuracy of trip threshold for voltage, not more, V
3
Determination accuracy of out-of-phase voltage, not more, V
3
Voltage when maintaining serviceability:
- phase voltage, when powered by one phase and zero wire is connected, not less, V
- line voltage, when powered by three phases, not more, V
180
450
Analog inputs:
- input to connect temperature transmitter (types: Pt100, Ni100, Ni120), pc.;
- input to connect temperature transmitter of PTC-1000 type, pc.;
- three analog inputs for standard CT with 5A output (T-0.66 type or similar), pc.;
- input to connect differential current transformer (zero sequence transformer) pc.;
- input to measure current of 0-20 mA, pc.;
- input to measure voltage of 0–10 V, pc..
1
1
3
1
1
1
Main outputs:
–-load relay –two groups of changeover contacts to control the electric motor starter –8
A, 250 V at cos φ=1;
–functional relay –one group of changeover contacts - 16A, 250V at cos φ=1 (function of
the relay is set by the user).
Permit according to temperature of temperature transmitters, °С
1
Power consumption (under load), VA, not more
5.0
Weight, not more, kg
0.34
Overall dimensions (Fig.1.1), H*B*L, mm 110*96*88,3
Position in space free
Housing material self-extinguishing plastic
Table 3.3 –Characteristics of built-in relay output contacts
Relay
Max. current
at U~250V
Number of
actuations х1000
Max. switching
power
Max. continuous
boosting AC / DC voltage
Max. current
at Ucont=30V
Functional relay
Cos = 0.4
Cos = 1.0
5А
16А
100
100
4000 VА
440/300 V
5 А
Load relay
Cos = 0.4
Cos = 1.0
2А
8А
100
100
2000 VА
460 V
3 А
3.2 MEASURED, CALCULATED, SPECIAL AND SERVICE PARAMETERS
Special and service parameters are intended only for transmission using MODBUS interface
(RS-485/RS-232). Special and service parameters are given in Table 3.4.
Measured and calculated parameters the values of which are displayed on LCD display, limits of their
measurements and accuracy are given in Table 3.5.
Parameter values can be transferred to PC connected to one of the UBZ interfaces (MODBUS, RS-232).
Parameter addresses are indicated in Table 3.5.
Table 3.4 –Special and Service Parameters
Measurement functions
Range
Remarks
Address
Heat balance of the motor
Read-only parameter of
RS-232, RS-485 interface
The number 1100000 corresponds to 100% of
accumulated heat at which the motor is switched off
when the thermal overload protection is enabled (it
2.4.7)
Read-only
parameter
73,74
Index of the last fault in
the fault logbook
It varies from 0 to 49, increasing by one after recording
another fault in the fault logbook. When the quantity of
faults will reach 50, the count of faults will begin again
from scratch.
Read-only
parameter
75

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NOVATEK-ELECTRO UBZ-304
Table 3.5 –Measured and Calculated Parameters
Measurement functions
Range
Accu-
racy
Mnemonic
Address
Data transfer
units
Currents
Effective values of phase currents, A
0.5 –
6300
2%
Phase i1
Phase i2
Phase i3
30,
31,
32
The tenth of
amperes.
When working
with measuring
transformers
with rated
current over
100A, the
currents
(measured and
calculated) in
addition to the
zero sequence
current (ground
fault) are
transferred via
RS-232/RS485
in amperes.
Effective value of positive-sequence current, A
0.5 –
6300
2%
Positive si
33
Effective value of zero-sequence current, A
0.3 –20
2%
Earth i0
34
Negative-sequence current (imbalance), A
0.2 –
200
5%
Revers si
35
Average current per each phase during the
time specified in the parameter "Tm average i"
Average i1
Average i2
Average i3
36,
37,
38
Maximum value of the average current for each
phase obtained since the last download. Reset
of all average values is performed by the
button RES/MEM/SEL in case of displaying
the maximum value of average current in any
phase (by indication of the present average
current of the respective phase).
<3 Iсt
> 3 Iсt
2%
10%
Peak i1
Peak i2
Peak i3
39
40
41
Motor starting current (average phase current)
Overload current (average phase current)
Starting time, s
Starting time is the period of time from when
all three-phase current will exceed 1.2 In and
up to the moment when three currents will
drop lower than 1.2 In. Maximum phase
current achieved during this period is the
maximum starting current.
<3 Iсt
> 3 Iсt
0.1 –
600
2%
10%
Start i
Overload i
Start time
42
43
44
Voltage
Effective values of phase voltages (determined
when connecting the neutral conductor to UBZ), V
100 –
300
3V
Phase U1
Phase U2
45
46
Volt
Phase U3
47
Volt
Effective values of line voltages, V
100 –475
5V
Line U1
Line U2
Line U3
48
49
50
Volt
Positive-sequence voltage, V
100 –300
3V
Positive sU
51
Negative-sequence voltage, V
3 –300
3V
Revers sU
52
Zero-sequence voltage (vector sum of three
phase voltages divided by three), (it is defined
when connecting to the neutral wire of UBZ), V
3 –100
3V
Zero sU
53
Miscellaneous
Time counter of motor operation, day
0 –999
Time motor
54
Motor insulation resistance1, MOhm
0 –19.9
10%
Insulation
55
Hundreds of kOm
Mains frequency, Hz
45 –65
1%
Frequency
56
Tenths of Hertz
Hold time before automatic restart2, s
0 –900
1 s
End of AR
57
Second
Time to overload trip (it indicates the time
remaining until shutdown made by thermal
overload protection)3, s
0 –600
1 s
Before OvL
58
Second
Waiting time after overload trip (it indicates
waiting time before permit to start-up blocked by
thermal overload protection)3, s
0 –900
1 s
After OvL
59
Second
Full power4, kVA
0 –5000
5%
Apparent P
60, 61
Dozens of Watts
Active power4, kW
0 –5000
5%
Active P
62, 63
Reactive power4, kVAr
0 –5000
5%
Reactive P
64, 65
Cosine of angle between voltage and phase
current L1
0 –1
5%
Cos A
66
Cosine of angle
between voltage
and current *1000
Cosine of angle between voltage and phase
current L2
0 –1
5%
Cos B
67

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UBZ-304 NOVATEK-ELECTRO
Table 3.5 (Continued)
Measurement functions
Range
Accu-
racy
Mnemonic
Address
Data transfer
units
Cosine of angle between voltage and phase
current L3
0 –1
5%
Cos C
68
Temperature of transmitter 15, °C
minus 40
–80
1°C
Temp
dat 1
69
5000 –
transmitter is off
1000±10 –s.c.
of transmitter
2000±10 –
transmitter
breakout
Temperature of transmitter 25, °C
minus 40
–220
1°C
Temp
dat 2
70
Current value at analogue input "4-20 mA", mA
0 –25
2%
Input i
71
1/100 mA
Voltage value at analog input "0-10 V", V
0 –10
2%
Input U
72
Tenths of Volt
Full electric power6, kVA/h
0 –
200000000
5%
ApE
90
91
‘00 W/h
Active electric power6, kW/h
0 –
200000000
5%
AcE
92
93
Reactive electric power6, kVAr/h
0 –
200000000
5%
ReE
94
95
Notes:
1If the insulation resistance of the motor is more than 20 MOm, then the value indicator displays code “>20M“.When
the motor is running (energized motor) the insulation resistance is not defined and the code indicator displays “---“(when
measuring circuit of motor insulation connecting).
2If ARS is disabled, the indicator displays “not”.
3If the time before shutdown by thermal overload protection or waiting time before permit to start-up is not defined
(more than 900 s), then the value indicator displays code “undef“. If the protection function is disabled, the indicator
displays “not”.
4If the power consumed by the load is more than 999 kW (kVA, kVAr), the values of power are displayed with MW
(MVA, MVAr).
5If the temperature value exceeds specified limits, then the indicator displays the alarm code in accordance with table
5.13. If the temperature sensor is disabled by software, then the indicator instead of temperature values displays “Off”.
6In excess of the energy meter of the value 200 000 000, the counter is reset and the energy metering will start from
zero. Recording the current values of the energy in the non-volatile memory is performed every 15 min.
3.3 PROGRAMMABLE PARAMETERS
Programmable parameters and their variation limits are given in Table 3.6.
Table 3.6 –Programmable Parameters
Settings and readings
Parameter
on LCD
Min.
value
Max.
value
Factory
setting
Message on LCD, actions
Address
Set the current time
Real Time
Setting of current time and date
(it. 5.2.8)
See Table
5.10
Transformers
Rated output current of
used CT, A
CT out i
1
5
5
151
Rated current of CT, A
CT nom i
20
800
100
152
Basic parameters
Rated current of motor,
A
Rated
Inоm
0
630
0
0 –current is not set: UBZ will not
enable the load relay (it. 5.1.5.7).
150
Time during which the
average current is
measured, s
Tm average
i
10
600
60
Time during which the average
current is measured (parameters:
"Average i1", "Average i2",
"Average i3" of Table 3.5).
153
Over-current protection
Type of over-current
protection
Type
Imax
0
5
0
0 –"Indep" - protection with
independent time delay.
Types of protection with
dependent time delay:
1 –"SIT" ; 2 –"VIT (LTI)";
3 –" EIT"; 4 –"UIT"; 5 –"RI".
154
Actuation setting for
over-current protection,
Imax coef
0.8
9
4
Repetition factor is set relative to
rated motor current (it is used at
155