DV Power TRT3 Series User manual

TRT3x
THREE-PHASE TRANSFORMER
TURNS-RATIO TEST INSTRUMENT
Manual

TRT3x Contents
M-T03XNN-205-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 TRT3x 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”...........................................................................................................13
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” ...................................................................................................14
4.9 Error Message “Connections”..........................................................................................................15
5 Troubleshooting Guide........................................................................................................................16
6 Customer Service................................................................................................................................17
7 Packing the Instrument for Shipment...................................................................................................17
8 Technical Data....................................................................................................................................18
8.1 Mains Power Supply........................................................................................................................18
8.2 Output data .....................................................................................................................................18
8.3 Measurement..................................................................................................................................18
8.4 Environmental conditions ................................................................................................................19
8.5 Dimensions and Weight...................................................................................................................19
8.6 Applicable Standards ......................................................................................................................19
9 Accessories.........................................................................................................................................20
Manufacturer Contact Information...............................................................................................................21
Manual Version: M-T03XNN-205-EN
This Manual refers to the following TRT3x models and their corresponding firmware versions
Model
Firmware versions
TRT30A
TR3A-5.15
TRT30B
TR3B-5.15
TRT30C
TR3C-5.15
TRT33A
TR1A-5.15
TRT33B
TR1B-5.15
TRT33C
TR1C-5.15

TRT3x Introduction
M-T03XNN-205-EN 3
1 Introduction
The purpose of this Manual is to provide helpful instructions on how to use TRT3x 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 TRT3x instrument.
TRT3x 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 8.6 of the “Technical Data” section of this document.
1.1 Safety Instructions
Safety is the responsibility of the user. Before operating TRT3x, please read the following safety instructions
carefully.
It is not recommended that TRT3x is used (or even turned on) without careful observation of the instructions
listed in this Manual. TRT3x 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 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.
Terms on the Device
The following warning terms used in this document may appear on the device:
WARNING: indicates that potential hazard may occur.
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
•TRT3x 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.
•TRT3x 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.
•Do not remove the protective casing of TRT3x.
•All service and maintenance work must be performed by qualified personnel only.

TRT3x Introduction
M-T03XNN-205-EN 4
1.1.3 Orderly Practices and Procedures
•The Manual shall always be available on the site where TRT3x is used.
•Before using TRT3x, all personnel (even personnel who only occasionally, or less frequently, work with
TRT3x) assigned to operate TRT3x should read the operations Manual.
•Do not make any modifications, extensions, or adaptations to TRT3x.
•Use TRT3x only with the original accessories provided by the manufacturer.
•Use TRT3x 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 TRT3x should only be carried out by authorized and qualified personnel.
•Personnel receiving any training or instructions on TRT3x should remain under 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 TRT3x. Therefore, it is not permitted to remove the
protective casing of TRT3x.
•Hazardous voltages exist on the terminals of TRT3x when the “Red”LED is lit. Never assume
connections are safe even if this LED is off. Switch off and unplug TRT3x before touching connections,
particularly if a fault is suspected.
•Before putting TRT3x into operation, check the test set for any visible damage.
•Do not operate TRT3x under wet or moist conditions (condensation).
•Do not operate TRT3x if explosive gas or vapors are present.
•Only external devices that meet the requirements for SELV equipment according to EN 60950 or IEC
60950 should be connected to TRT3x through the serial interface.
•Removing theTRT3x protective casing will void the warranty. Any work inside the instrument without
prior authorization from DV Power will also void the warranty.
•If TRT3x 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 TRT3x, ensure that a 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 TRT3x. Ground connections may be left in place.
•Do not use TRT3x without the extra protective ground cables supplied with TRT3x. It must never be
operated in a non-grounded configuration as this may result in an electrical shock to the user or damage
to TRT3x. Always establish this connection first before establishing any other connections and remove
this connection as the very last one.
•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).

TRT3x Introduction
M-T03XNN-205-EN 5
•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 TRT3x and is a significant safety hazard to personnel.
1.2 Power Supply
•Supply TRT3x only from a power outlet equipped with a protective ground.
•Besides supplying TRT3x 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”.
•TRT3x 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
TRT3x 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 TRT3x 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. TRT3x 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, TRT3x measures the excitation current at the HV transformer side,
as well as the phase angle between the applied test voltage and induced voltage.
There are three ways to perform the measurements depending on the test object and a test voltage. If the
test object is a single-phase transformer, a single-phase autotransformer or a current transformer, TRT3x
provides a single-phase test voltage to the transformer’s primary side and measures the induced voltage at
the transformer’s secondary side.

TRT3x Introduction
M-T03XNN-205-EN 6
If the test object is a three-phase transformer or a three-phase autotransformer, TRT3x 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 any use of TRT3x other than the ones described in this Manual are considered improper and
will void the device warranty.

TRT3x Description
M-T03XNN-205-EN 7
2 Description
2.1 Front Panel Components
1. Mains Power Connector and Power Switch
Mains power connector
Connect TRT3x to the mains power supply with a power cord.
Power switch –Double pole switch
•IIn this position, TRT3x is connected to the mains power supply.
•0In this position, TRT3x is separated from the mains power supply.
2. Protective Earth Connector
For protection against parasitic currents or voltages, always connect TRT3x 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 device programming as well as the measured values during a test
operation.

TRT3x Description
M-T03XNN-205-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 TRT3x 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
TRT3x is equipped with an USB serial interface to connect to external computer if required.
Flash Drive
TRT3x is equipped with a USB flash drive connector to save test results to a 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.

TRT3x Getting Started
M-T03XNN-205-EN 9
3 Getting Started
3.1 Connecting TRT3x to a Test Object
Before TRT3x 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.
•TRT3x itself should be properly grounded. To do this, the grounding screw on the top of TRT3x
should be connected to PE using the provided grounding cable.
Note: Always connect measuring cables to TRT3x first and then to the test object terminals.
Additionally, measuring cables can be connected to the test object terminals first, but
only if the test object terminals are grounded.
When disconnecting, always disconnect cables from the test object terminals first and
then from TRT3x. Additionally, measuring cables can be disconnected from TRT3x first,
but only if 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 the 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 from 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 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 the same way 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

TRT3x Getting Started
M-T03XNN-205-EN 10
3.2 Setting the Measurement Parameters
Five seconds after the first (initial) message on the display, TRT3x 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 the 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 the Table 4
Press ENTER to choose one of the available options in the configuration menu.
1. If the vector group is selected, TRT3x 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, TRT3x 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, TRT3x 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, TRT3x will display the special menu for autotransformers to the user.
5. If the AVGD option is selected, TRT3x will automatically detect the vector group of the transformer under
test.
6. If TRUE 3~ TEST is selected, TRT3x 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, Y-d, YN-z, YN-zn, YN-d, Z-y, Z-yn, ZN-y, ZN-yn
1-3-5-7-9-11