DV Power TRT30C User manual

TRT30C
THREE-PHASE TRANSFORMER
TURNS-RATIO TEST INSTRUMENT
Manual

TRT30C Contents
M-T030CN-203-EN 2
Contents
1 Introduction............................................................................................................................................3
1.1 Safety Instructions..............................................................................................................................3
1.1.1 Safety Terms and Symbols.........................................................................................................3
1.1.2 Terms of Use..............................................................................................................................3
1.1.3 Orderly Practices and Procedures..............................................................................................4
1.1.4 Instrument Maintenance.............................................................................................................4
1.1.5 Operator Qualifications...............................................................................................................4
1.1.6 Safe Operating Procedures ........................................................................................................4
1.2 Power Supply.....................................................................................................................................5
1.3 Measurement Category......................................................................................................................5
1.4 Intended Use......................................................................................................................................5
2 Description.............................................................................................................................................7
2.1 Front Panel Components....................................................................................................................7
3 Getting Started.......................................................................................................................................9
3.1 Connecting the TRT30C to a Test Object...........................................................................................9
3.2 Setting the Measurement Parameters..............................................................................................10
4 Error Messages....................................................................................................................................13
4.1 Error Message “Excitation current too high”......................................................................................13
4.2 Error Message “Turns ratio too low” .................................................................................................13
4.3 Error Message “Malfunction” ............................................................................................................13
4.4 Error Message “Error printer”............................................................................................................14
4.5 Error Message “Check paper” ..........................................................................................................14
4.6 Error Message “USB flash drive” ......................................................................................................14
4.7 Error Message “Connect both neutral cables” ..................................................................................14
4.8 Error Message “Emergency Stop” ....................................................................................................15
4.9 Error Message “Connections”...........................................................................................................15
5 Technical Data.....................................................................................................................................16
5.1 Mains Power Supply.........................................................................................................................16
5.2 Output data ......................................................................................................................................16
5.3 Measurement...................................................................................................................................16
5.4 Environmental conditions .................................................................................................................16
5.5 Dimensions and Weight....................................................................................................................16
5.6 Applicable Standards .......................................................................................................................17
6 Accessories..........................................................................................................................................18
Manufacturer Contact Information................................................................................................................19
Manual Version: M-T030CN-203-EN
This Manual refers to the firmware version TR3C-5.15

TRT30C Introduction
M-T030CN-203-EN 3
1 Introduction
The purpose of this Manual is to provide helpful instructions on how to use the TRT30C instrument safely,
properly and efficiently.
The following instructions will help the user avoid unsafe situations, reduce maintenance costs and will
ensure the reliability and durability of the TRT30C instrument.
The TRT30C must be used in accordance with all existing safety requirements and regulations based on
national/local standards for accident prevention and environmental protection. In addition, the relevant
international standards are listed in paragraph 5.6 of the “Technical Data” section of this document.
1.1 Safety Instructions
Safety is the responsibility of the user. Before operating the TRT30C, please read the following safety
instructions carefully.
It is not recommended that the TRT30C is used (or even turned on) without careful observation of the
instructions listed in this Manual. The TRT30C should only be operated by trained and authorized
personnel.
1.1.1 Safety Terms and Symbols
Terms in this Manual
These terms may appear in the Manual:
WARNING: Warning statements identify conditions or practices that could result in injury or loss of life.
CAUTION: Caution statements identify conditions or practices that could result in damage to this product or
to other property.
Terms on the Device
The following warning terms used in this document may appear on the device:
WARNING: Warning indicates that potential hazard may occur.
CAUTION: Caution indicates that potential damage may occur to the instrument or to the test object
connected to the instrument.
Symbols on the Device
The following symbols may appear on the device:
Refer to Protective
Manual Earth
Terminal
1.1.2 Terms of Use
•The TRT30C shall be used only if it is in good technical condition. Its use shall be in accordance with
local safety and industrial regulations. Adequate precautions must be taken to avoid any risks related to
high voltages associated with this equipment and nearby objects.
•The TRT30C shall be used only for the application purposes described in the ”Intended Use” section.
The manufacturer and distributors are not liable for damage resulting from wrong usage. The user bears
responsibility for not following the instructions defined in this document.

TRT30C Introduction
M-T030CN-203-EN 4
•Do not remove the protective casing of the TRT30C.
•All service and maintenance work must be performed by qualified personnel only.
1.1.3 Orderly Practices and Procedures
•The Manual shall always be available on the site where the TRT30C is used.
•Before using the TRT30C, all personnel (even personnel who only occasionally, or less frequently, work
with the TRT30C) assigned to operate the TRT30C should read the operations Manual.
•Do not make any modifications, extensions, or adaptations to the TRT30C.
•Use the TRT30C only with the original accessories provided by the manufacturer.
•Use the TRT30C and its original accessories for the device’s intended use only.
1.1.4 Instrument Maintenance
The device should be kept clean in order to prevent excessive cases of dust or other contaminants affecting
its operation. It should be cleaned with water/isopropyl alcohol after any dirt/contaminants are noticed on its
surfaces.
1.1.5 Operator Qualifications
•Testing with the TRT30C should only be carried out by authorized and qualified personnel.
•Personnel receiving training, instruction or education on the TRT30C should remain under the constant
supervision of an experienced operator while working with the test set and the test object.
1.1.6 Safe Operating Procedures
•Hazardous voltages of up to 400 V can occur inside the TRT30C. Therefore, it is not permitted to
remove the protective casing of the TRT30C.
•Hazardous voltages exist on the terminals of the TRT30C when the “Red”LED is lit. Never assume that
the connections are safe even if this LED is off. Switch off and unplug the TRT30C before touching the
connections, particularly if a fault is suspected.
•Before putting the TRT30C into operation, check the test set for any visible damage.
•Do not operate the TRT30C under wet or moist conditions (condensation).
•Do not operate the TRT30C if explosive gas or vapors are present.
•Only the external devices which meet the requirements for SELV equipment according to EN 60950 or
IEC 60950 should be connected to the TRT30C through the serial interface.
•Removing theTRT30C protective casing will void the warranty. Any work inside the instrument without
prior authorization from DV Power will also void the warranty.
•If the TRT30C seems to be malfunctioning, please contact the DV Power Support Team (refer to the
“Manufacturer Contact Information” section) after previously checking the “Error Messages” section.
•Prior to connecting the TRT30C, ensure that the transformer (object) to be tested is completely de-
energized and isolated from both the line and the load. Every terminal should be checked and verified
before connecting the TRT30C. Ground connections may be left in place.
•Do not use the TRT30C without the extra protective ground cables supplied with the TRT30C. It must
never be operated in a non-grounded configuration as this may result in an electrical shock to the user
or damage to the TRT30C. Always establish this connection first before establishing any other
connections and remove this connection as the very last one.

TRT30C Introduction
M-T030CN-203-EN 5
•Wherever possible, the outer casing of the transformer under test should also be connected to a safety
earth to prevent the risk of shock. Where this cannot be achieved, adequate precautions should be
taken to prevent access to the transformer (e.g. barriers).
•Never exchange connections to the HV and LV sides of the transformer. The “H”connections must
always be connected to the High Voltage side of the transformer. The “X”connections must always be
connected to the Low Voltage side of the transformer. Interchanging any or all of the connections may
result in damage to the transformer or the TRT30C and is a significant safety hazard to personnel.
1.2 Power Supply
•Supply the TRT30C only from a power outlet which is equipped with the protective ground.
•Besides being supplying the TRT30C from phase –neutral (L1-N, A-N), it may also be supplied from
phase to phase (e.g., L1-L2; A-B). However, the voltage must not exceed 264 V AC. Please refer to the
section “Technical Data”.
•The TRT30C should be positioned in such a way that it is possible to safely disconnect it from the power
supply at any moment.
WARNING / AVERTISSEMENT
This is a class A product. In a domestic environment this product may cause radio interference in which
case the user may be required to take adequate measures.
Il s'agit d'un produit de classe A. Dans un environnement domestique, ce produit peut provoquer des
interférences radio, auquel cas l'utilisateur peut être amené à prendre des mesures adéquates.
1.3 Measurement Category
The TRT30C is intended to be used for measurements in Measurement Category I (CAT I) for voltages up
to 250V. The device is also designed to withstand occasional transient overvoltage up to 1000Vpk.
WARNING / AVERTISSEMENT
This equipment is classified as measurement category I, and must not be used within measurement
category II, III and IV.
Cet équipement est classée dans la I catégorie de mesure, et ne doit pas être utilisé pendant les
catégories de mesure II ,III et IV.
1.4 Intended Use
The Three-phase Transformer Turns Ratio Tester TRT30C is designed specifically for performing
measurements on power, distribution and measurement transformers as follows:
•turns ratio measurement,
•phase shift measurement,
•excitation current measurement.
These three tests are performed at the same time. The TRT30C applies test voltage to HV transformer
terminals and measures induced voltage at LV transformer terminals. The ratio of these voltages is actually
the turns ratio of a transformer. At the same time, the TRT30C measures the excitation current at the HV
transformer side, as well as the phase angle between the applied test voltage and induced voltage.

TRT30C Introduction
M-T030CN-203-EN 6
There are three ways to perform the measurements depending on the test object and test voltage. If the test
object is a single-phase transformer, a single-phase autotransformer or a current transformer, the TRT30C
provides a single-phase test voltage to the transformer’s primary side and measures the induced voltage at
the transformer’s secondary side.
If the test object is a three-phase transformer or a three-phase autotransformer, the TRT30C can apply
either three single-phase test voltages in turns or a true three-phase test voltage to the transformer primary
windings. Three induced voltages at the transformer’s secondary side are measured.
Please note that any uses of the TRT30C other than the ones described in this Manual are considered
improper and will void the device warranty.

TRT30C Description
M-T030CN-203-EN 7
2 Description
2.1 Front Panel Components
1. Mains Power Connector and Power Switch
Mains power connector
Connect the TRT30C to the mains power supply with a power cord.
Power switch –Double pole switch
•IIn this position, the TRT30C is connected to the mains power supply.
•0In this position, the TRT30C is separated from the mains power supply.
2. Protective Earth Connector
For protection against parasitic currents or voltages, always connect the TRT30C protective earth
connector to the protective ground (PE). Use only the original cable.
For safety reasons, always establish this connection before establishing any other connection, and
remove this connection as the very last step.
3. Operator Control
Display
Displays the settings during the programming of the device as well as the measured values during a
test operation.

TRT30C Description
M-T030CN-203-EN 8
Keyboard
Used to control the device.
•Use the UP/DOWN button to navigate and set the test parameters.
•Use the ENTER button to confirm the defined test parameters, language, time and date.
•Use the STOP button to stop a test, to acknowledge the alarm buzzer and to return to the
previous menu.
•Use the SET button to scroll between the two main menus and the START button to start the
test.
•Use the PRINT button to print the results with the built-in thermal printer. The built-in thermal
printer is an optional accessory.
Green LED
•Lights continuously when the TRT30C is turned on.
•Flashes when a test can be started.
Red LED
•Lights continuously in case of an operational error.
•Lights continuously when a test is started and a test voltage is applied.
4. H and X Terminals
H cable terminal
The terminal for connecting the H test cable.
X cable terminal
The terminal for connecting the X test cable.
5. Emergency Stop
Turns off output voltage in case of an emergency.
6. Interface and Flash Drive Connectors
Interface
The TRT30C is equipped with an USB serial interface to connect to an external computer if
required.
Flash Drive
The TRT30C is equipped with a USB flash drive connector to save the test results to the flash drive
for additional analysis if desired.
7. TC Control
TC Connector
Output for the remote control of the transformer tap changer.
•Use the UP button to raise the tap changer position.
•Use the DOWN button to lower the tap changer position.

TRT30C Getting Started
M-T030CN-203-EN 9
3 Getting Started
3.1 Connecting the TRT30C to a Test Object
Before the TRT30C has been connected to a test object (e.g. power transformer), the following steps have
to be verified:
•The test object is disconnected from its circuit in accordance with the national safety regulations and
is properly grounded to the protective earth.
•The transformer is completely de-energized.
•The TRT30C itself should be properly grounded. To do this, the grounding screw on the top of the
TRT30C should be connected to PE using the provided grounding cable.
Note: Always connect measuring cables to the TRT30C first and then to the test object
terminals. Additionally, measuring cables can be connected to the test object terminals
first, but only under condition that the test object terminals are grounded.
When disconnecting, always disconnect cables from the test object terminals first and
then from the TRT30C. Additionally, measuring cables can be disconnected from the
TRT30C first, but only under condition that the test object terminals are grounded.
The grounding wire PE should be disconnected last.
Not following these instructions may cause life-threatening situations.
Cable test leads are terminated with the specially adjusted clips. The colors and markings of the test cables
are shown in table 1.
Table 1: Test lead colors and markings
If the primary neutral connection does not exist, the 1N (H0; N) lead should be left isolated from the
transformer (i.e. the test object) and the other connection leads. It must be placed in such a way that it is
completely isolated from other connections or earth. No personnel should be in a position to touch it!
To maximize the accuracy and measurement repeatability, make sure that all clamps have a good
connection to the test object and avoid any crossing between the measuring cables.
If the three-phase transformer has a tertiary winding, it should be tested in the same manner as the
secondary. The transformer is energized using the high voltage windings. Test leads 2U, 2V, 2W and 2N
(X1, X2, X3 and X0; a, b, c and n)are in this case connected to the tertiary winding of the transformer.
IEC Test
Lead
Marking
ANSI
Test Lead
Marking
Australian
Test Lead
Marking
Transformer
Terminal
Voltage
Test Lead
Color IEC
Australian
Test Lead
Colors
Malaysian
Test Lead
Colors
1N
H0
N
Neutral
Blue
Black
Black
1U
H1
A
High
Red
Red
Red
1V
H2
B
High
Black
White
Yellow
1W
H3
C
High
Yellow
Blue
Blue
2N
X0
n
Neutral
Blue
Black
Black
2U
X1
a
Low
Red
Red
Red
2V
X2
b
Low
Black
White
Yellow
2W
X3
c
Low
Yellow
Blue
Blue

TRT30C Getting Started
M-T030CN-203-EN 10
3.2 Setting the Measurement Parameters
Five seconds after the first (initial) message on the display, the TRT30C automatically changes the display
to the CONFIGURATION menu and the green LED lights up. By pressing SET the user can switch between
the CONFIGURATION menu and the MEMORY menu.
Press UP/DOWN in the HV CONFIG field to select the test mode to be performed. A list of the available test
modes is shown in tables 2 and 4.
Table 2: Available options in the configuration menu
HV
Config.
LV
Config.
Ph
Displacement
Comment
Test mode
D
displayed
displayed
Delta winding
Phase by phase test
using single-phase
voltage in turns
&
the true 3-phase test
using 3-phase voltage
Y
displayed
displayed
Star winding
YN
displayed
displayed
Star winding with neutral point
Z
displayed
displayed
Zigzag
ZN
displayed
displayed
Zigzag with neutral point
AVGD
hidden
hidden
Automatic vector group
detection
SINGLE
hidden
hidden
Single-phase transformer
Single phase test
using single-phase
voltage
CT
hidden
hidden
Current transformer (CT)
TRUE 3~
TEST
hidden
hidden
Only true three-phase test
True 3-phase test
using 3-phase voltage
AUTO
hidden
hidden
Autotransformer menu
See table 4
Press ENTER to choose one of the available options in the configuration menu.
1. If the vector group is selected, the TRT30C will perform both the true three-phase test by applying true
three-phase test voltage and the phase by phase test by applying single phase test voltages to all phases
in turn.
2. If SINGLE is chosen, the TRT30C will test a single phase transformer by applying the single phase test
voltage between 1U/H1/A and 1N/H0/N.
3. If CT is chosen, the TRT30C will test a current transformer by applying the single phase test voltage
between 1U/H1/A and 1N/H0/N.
4. If AUTO is chosen, the TRT30C will display the special menu for autotransformers to the user.
5. If the AVGD option is selected, the TRT30C will automatically detect the vector group of the transformer
under test.
6. If TRUE 3~ TEST is selected, the TRT30C will perform the true three-phase test by applying the true
three-phase test voltage.
Table 3 lists the available vector groups in this menu.
Table 3: Available vector group configurations
Configuration
Displacements
D-D, D-Z, D-Zn, Z-D, Zn-D, Y-Y, Y-Yn, Yn-Y, Yn-Yn
0-2-4-6-8-10
D-Y, D-Yn, Y-D, Y-Z, Y-Zn, Yn-D, Yn-Zn, Z-Y, Z-Yn, Zn-Y, Zn-Yn
1-3-5-7-9-11