Megger TTR310 User manual

AVTMTTR310
Rev 8
May 2016
Instruction Manual AVTMTTR310
for
Three-Phase TTR

Transformer Turn Ratio Test Set
Catalog No. TTR310, TTR310-47, TTR310E
High-Voltage Equipment
Read the entire manual before operating.
Aparato de Alto Voltaje
Antes de operar este producto lea este manual enteramente.
M
Valley Forge Corporate Center
2621 Van Buren Avenue
Norristown, PA 19403 U.S.A.
610-676-8500
www.megger.com

Three-Phase TTR310
Transformer Turn Ratio Test Set
Instruction Manual

Copyright Notice
Copyright1999-2016 by Megger. All rights reserved.
Disclaimer Notice
The information contained in this manual is believed to be adequate for the intended use of the product.
If the product or its individual instrument are used for purposes other than those specified herein,
confirmation of their validity and suitability must be obtained from Megger. Refer to the warranty
information included at the end of this instruction manual. Specifications are subject to change without
notice.
Warranty
Products supplied by Megger are warranted against defects in material and workmanship for a period of
one year following shipment. Our liability is specifically limited to replacing or repairing, at our option,
defective equipment. Equipment returned to the factory must be shipped prepaid and insured. This
warranty does not include batteries, lamps, or other expendable items, where the original manufacturer's
warranty shall apply. We make no other warranty. The warranty is void in the event of abuse (failure to
follow recommended operating procedures) or failure by the customer to perform specific maintenance
as indicated in this manual.

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TABLE OF CONTENTS
1INTRODUCTION .....................................................................................................................................................1
2SAFETY....................................................................................................................................................................5
3SPECIFICATIONS ....................................................................................................................................................9
Input Power .................................................................................................................................................9
Pollution Degree..........................................................................................................................................9
Protective Devices.......................................................................................................................................9
Output Test Voltage and Current.............................................................................................................9
Test Frequency ............................................................................................................................................9
Loading of Test Transformer................................................................................................................. 10
Measuring Ranges..................................................................................................................................... 10
Accuracy .................................................................................................................................................... 10
Measurement Method.............................................................................................................................. 10
Transformer Winding Phase Relationship............................................................................................ 11
Measuring Time........................................................................................................................................ 11
Display ....................................................................................................................................................... 11
Memory Storage ....................................................................................................................................... 11
Interface..................................................................................................................................................... 11
4DESCRIPTION...................................................................................................................................................... 15
5SETUP AND CONNECTIONS............................................................................................................................... 19
Single-Phase, Two-Winding Transformers........................................................................................... 19
Current Transformers (CTs)................................................................................................................... 25
Unmounted CTs....................................................................................................................................... 25
Bushing Current Transformer (BCT) Mounted on Single-Phase, Two-Winding Transformer... 27
BCTs Mounted on Three-Phase Transformers................................................................................... 28
T-Type Transformers .............................................................................................................................. 31
Connections and Vector Voltage Diagrams......................................................................................... 32
Notes to Table 5-4 ................................................................................................................................... 35
Notes to Table 5-5 ................................................................................................................................... 47
Notes to Table 5-6 ................................................................................................................................... 58
6OPERATION......................................................................................................................................................... 67
MAIN MENU Screen (Figure 6-1) ....................................................................................................... 68
QUICK TEST SETUP Screen (Figure 6-2)......................................................................................... 70
Quick Test Result Screens (Figure 6-3 and Figure 6-4)...................................................................... 71
FULL TEST SETUP 1 Screen (Figure 6-5)......................................................................................... 73
FULL TEST SETUP 2 Screen (Figure 6-6)......................................................................................... 75
FULL TEST SETUP 3 Screen (Figure 6-7)......................................................................................... 77
Transformer Test Result Screens (Figure 6-8 and Figure 6-9).................................................. 79
Main Menu Screen When a Custom Transformer Setting Recalled (Figure 6-10) ......................... 82
SYSTEM SETUP Menu (Figure 6-11) ................................................................................................. 83
LANGUAGE Screen (Figure 6-12) ...................................................................................................... 84
SAVED DATA Screen (Figure 6-13) ................................................................................................... 85
Recall (or Save) Custom Transformer Settings (Figure 6-14)............................................................ 86
Error Messages ......................................................................................................................................... 87

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7TTR 300 SERIES POWERDB LITE USER MANUAL .........................................................................................91
Operating Instructions for the Multiple Quick Test Form.............................................................. 105
Operating Instructions for the Simple 3PH TTR Form .................................................................. 106
Operating Instructions for the 3PH TTR with TAP Changer Form............................................. 107
8SERVICE ............................................................................................................................................................. 109
Voltage Selection.................................................................................................................................... 111
Troubleshooting..................................................................................................................................... 115
Repair....................................................................................................................................................... 116
GLOSSARY ............................................................................................................................................................. 117

Table of Contents
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LIST OF ILLUSTRATIONS
TTR310 Transformer Turn Ratio test set.............................................................................................................1
Figure 4-1.Three-Phase TTR310 Test Set Block Diagram...................................................................... 16
Figure 4-2.Three-Phase TTR310 Control Panel ....................................................................................... 17
Figure 5-1.Setup for Testing Single-Phase Transformer.......................................................................... 20
Figure 5-2.Setup for Testing Single-Phase Autotransformer .................................................................. 20
Figure 5-3.Setup for Testing Single-Phase, Type A (Straight Design) Step Voltage Regulator ......... 21
Figure 5-4.Setup for Testing Single-Phase, Type B (Inverted Design) Step Voltage Regulator ........ 22
Figure 5-5.Setup for Testing Unmounted Current Transformer............................................................ 26
Figure 5-6.Setup for Testing Taps on Multiple Tap CT .......................................................................... 26
Figure 5-7.Setup for Testing BCT Mounted on Single-Phase Two-Winding Transformer ............... 27
Figure 5-8.Setup for Testing BCT Mounted on Delta Winding on a Three-Phase Power
Transformer................................................................................................................................. 29
Figure 5-9.Setup for Testing BCT Mounted on Wye Winding of a Three-Phase Transformer........ 30
Figure 5-10.Winding Connections and Phase Relationship ...................................................................... 34
Figure 6-1.Main Menu Screen...................................................................................................................... 68
Figure 6-2.Quick Test Setup Screen ........................................................................................................... 70
Figure 6-3.Initial Quick Test Result Screen............................................................................................... 71
Figure 6-4.Final Quick Test Result Screen ................................................................................................ 72
Figure 6-5.FULL TEST SETUP 1 Screen ................................................................................................. 73
Figure 6-6.FULL TEST SETUP 2 Screen ................................................................................................. 75
Figure 6-8.FULL TEST SETUP 3 Screen ................................................................................................. 77
Figure 6-8.Three-Phase Transformer Test Result Screen........................................................................ 79
Figure 6-9.Phase A Test Result Screen....................................................................................................... 80
Figure 6-10.The Main Menu Screen After Selection of a Custom Transformer Setting ...................... 82
Figure 6-11.SYSTEM SETUP Screen .......................................................................................................... 83
Figure 6-12.Language Screen ......................................................................................................................... 84
Figure 6-13.SAVED DATA Screen.............................................................................................................. 85
Figure 6-14.Recall (or Save) Custom Settings Screen................................................................................. 86
Figure 6-15a. Sample Test Report Header........................................................................................................ 89
Figure 6-15b. Sample Single Phase Test Report .............................................................................................. 89
Figure 6-15c. Sample Three-Phase Test Report............................................................................................... 90

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LIST OF TABLES
Table 5-3. T-type Transformer Winding Phase Relationship..................................................................31
Table 5-4. ANSI Transformer Winding Phase Relationship ...................................................................37
Table 5-5. CEI/IEC 76-1:1993 Transformer Winding Phase Relationship..........................................49
Table 5-6. Transformer Winding Phase Relationship (Australian Std. 2374, Part 4 - 1982)...............60
Table 7-1. Troubleshooting Guide ........................................................................................................... 115

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PROPRIETARY INFORMATION NOTICE
This document contains information proprietary to Megger. All rights are
reserved.
No part of this document may be reproduced, transmitted, processed or
recorded by any means or form, electronic, mechanical, photographic or
otherwise, nor be released to any third party without the express written consent
of Megger.
Megger Software End User License Agreement
NOTICE TO USER: THIS IS A CONTRACT. BY INSTALLING/USING
THIS PRODUCT YOU ACCEPT ALL TERMS AND CONDITIONS OF
THIS AGREEMENT. If you do not agree with the terms and conditions of this
Agreement, return the software, unused, along with the rest of the package, to
Megger. This package contains software and related explanatory written
materials. The term Software shall also include any upgrades, modified versions,
updates, additions and copies of the Software licensed to you by Megger. Megger
grants you a nonexclusive license to use the Software and Documentation,
provided you agree to the following:
Use of the Software – You may –
Install the software on any computer within your company.
Make one backup copy of the Software.
Copyright – The Software is owned by Megger, and its structure, organization
and code are the valuable trade secrets of Megger. The Software is also protected
by United States Copyright Law and International Treaty provisions. You must
treat the Software just as you would any other copyrighted material, such as a
book. You may not copy the Software or the Documentation, except as set forth
in the Use of the Software section. Any copies that you are permitted to make
pursuant to this Agreement must contain the same copyright and other
proprietary notices that appear on or in the Software. You agree not to modify,
adapt or translate the software. You also agree not to reverse engineer,
decompile, disassemble or otherwise attempt to discover the source code of the
Software.
Transfer – You may not rent, lease, sublicense or lend the Software or
Documentation. You may, however, transfer all of your rights to use the
Software to another person of legal entity provided that you transfer this
Agreement, the Software, including all copies, updates and prior versions, and all
Documentation to such person or entity, and that you retain no copies, including
copies stored on a computer.

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Limited Warranty – Megger warrants that the SOFTWARE will perform
substantially in accordance with the accompanying written materials for a period
of one year from date of receipt. Any implied warranties on the SOFTWARE are
limited to one year.
Customer Remedies – Megger and its suppliers’ entire liability and your
exclusive remedy shall be, at Megger option, either (a) return of the price paid, or
(b) repair or replacement of the SOFTWARE that does not meet this Limited
Warranty and which is returned to Megger with proof of purchase. This Limited
Warranty is void if failure of the SOFTWARE has resulted from accident, abuse,
or misapplication. Any replacement SOFTWARE will be warranted for the
remainder of the original warranty period or thirty (30) days, whichever is longer.
No Other Warranties – To the maximum extent permitted by applicable law,
Megger and its suppliers disclaim all other warranties, either express or implied,
including, but not limited to implied warranties of merchantability and fitness for
a particular purpose, with regard to the SOFTWARE, the accompanying written
materials, and any accompanying hardware.
No Liability for Consequential Damages – To the maximum extent
permitted by applicable law, in no event shall Megger or its suppliers be liable for
any damages (including without limitation, special, incidental, consequential, or
indirect damages for personal injury, loss of business profits, business
interruption, loss of business information, or any other pecuniary loss) arising
out of the use of or inability to use this product, even if Megger has been advised
of the possibility of such damages. In any case, Megger and its suppliers’ entire
liability under any provision of this agreement shall be limited to the amount
actually paid by you for the SOFTWARE.
Megger Technical Support
In the event that the PowerDB Lite software appears defective or if you need
assistance in the operation of the PowerDB Lite software, call the MEGGER
SUPPORT DEPT at [phone]. The Megger Support Dept will determine
the necessary support to correct the problem.

Proprietary Information Notice
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CUSTOMER FEEDBACK
We listen to our customers very seriously when they express interest in or
suggest new or modified features. Please feel free to call, e-mail, fax, or write
with any comments or suggestions you may have. We can be contacted at the
following:
By Phone: [phone]
By Fax: [phone]
By Website: www.megger.com
By Mail:
Megger
Valley Forge Corporate Center
2621 Van Buren Avenue
Norristown, PA 19403 U.S.A.
IMPORTANT!
Megger periodically provides updates of software. See our web site www.megger.com
to obtain these download updates.
SEE ALL OF OUR PRODUCTS, APPLICATION NOTES, FAQ’s BY
PRODUCT, AND LOCAL REP INFORMATION ON THE WEB AT:
www.megger.com
AUDIENCE
This manual is written for technical personnel who are familiar with the various
measurements performed by a TTR and have a general understanding of their use and
operation. Such personnel should also be thoroughly familiar with the hazards associated
with the use of this equipment and should have received proper safety training.

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MANUAL CONVENTIONS
This manual uses the following conventions:
Bold indicates emphasis or a heading.
Arial Bold denotes the use of a screen button (i.e. click the TTR button).
Ctrl+Enter indicates that to perform the function, press both keys
simultaneously (i.e. Ctrl+Enter indicates that you hold-down the Control (Ctrl)
key while simultaneously striking the Enter key).
NOTE: is used to set off important information from the rest of the text.
A WARNING symbol alerts you to a hazard that may result in
equipment damage, personal injury, or death. Carefully read the
instructions provided and follow all safety precautions.
A CAUTION symbol alerts you that the system may not operate
as expected if instructions are not followed.

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1
Introduction
Upon Receipt of Product
Check the equipment received against the packing list to ensure that all materials
are present. Notify Megger of any shortage. Telephone [phone].
Examine the instrument for damage received in transit. If any damage is
discovered, file a claim with the carrier at once and notify Megger or its nearest
authorized sales representative, giving a detailed description of the damage.
This instrument has been thoroughly tested and inspected to meet rigid
specifications before being shipped. It is ready for use when set up as indicated
in this manual.
TTR310 Transformer Turn Ratio test set

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General Information
The Three-Phase TTR®310 Test Set is fully automatic, self-checking, self-
calibrating, menu-driven unit. The test set measures the turn ratio, phase shift,
and excitation current of power, distribution, and instrument transformers. A
“-47” suffix added to the catalog number denotes a 230-V, 50 Hz input power
supply, rather than the standard 120-V supply. The test set is a portable
instrument housed in a sturdy plastic case with lid and carrying strap. The inside
bottom half of the case is nickel coated. A canvas carrying bag is supplied to hold
all accessories.
The test set can be used to test single-phase and three-phase transformers, both
with and without taps in accordance with the requirements of the IEEE
C57.12.90 – 2013, IEC 60076-1 and CIGRE TB 445 standards. For three-phase
measurements, the test set is connected to all Three-Phases of the transformer to
be tested. The TTR310 lead selection circuitry permits automatic measurement
of all phases without changing connections. This feature eliminates the need to
refer to hook-up charts when testing three-phase transformers. Turn ratio, phase
shift and excitation current readings are displayed on a large LCD. Transformer
excitation current as well as phase shift angle helps to detect transformer shorted
turns or an unequal number of turns connected in parallel. Operating condition
(error) messages identify incorrect test connections, abnormal operating
condition, or winding problems. Test results can be saved, printed out on an
optional printer, or uploaded to a personal computer (PC).
Features include:
Fully automatic operation.
Self-checking at power-up.
Self-calibration at each measurement.
User-friendly, menu-driven operation.
Test turn ratio, phase shift (in both degree and centiradian), and excitation
current.
Easy measuring of regular windings, tertiary windings, and CTs.
Storage capacity for up to 200 tests for retrieving, printing out, or uploading
to a PC.
Saving up to 9 custom transformer settings for faster and easier testing.
Checking reverse polarity at start of each test.
External printer records test data.
External PC or laptop can be connected instead of a printer to transfer test
results and to provide full transformer test report.
Quick test mode provides the fastest testing of a transformer.

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Three excitation test voltages: 80 V, 40 V, and 8 V.
Testing to ANSI, IEC, and Australian standards.
Leads marked to ANSI, IEC, and Australian standards.
Choice of six languages.
Large, easy-to-read LCD shows alphanumeric data
Meets the requirements of both the European EMC and Low Voltage
Directives.
Trouble-free operation in switchyards under electrostatic and magnetic
interference conditions.

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2
Safety
The test set and the specimen to which it is connected are a possible source of
high-voltage electrical energy and all persons making or assisting in tests must
use all practical safety precautions to prevent contact with energized parts of the
test equipment and related circuits. Persons actually engaged in the test must
stand clear of all parts of the complete high-voltage circuit, including all
connections, unless the test set is de-energized and all parts of the test circuit are
grounded. Persons not directly involved with the work must be kept away from
test activities by suitable barriers, barricades, or warnings.
Treat all terminals of high-voltage power equipment as a potential electric shock
hazard. There is always the possibility of voltages being induced at these
terminals because of proximity to energized high-voltage lines or equipment.
Always disconnect test leads from power equipment before attempting to
disconnect them at the test set. The ground connection must be the first made
and the last removed. Any interruption of the grounding connection can create
an electric shock hazard.
This instrument operates from a single-phase power source. It has a three-wire
power cord and requires a two-pole, three-terminal, live, neutral, and ground type
connector. The voltage to ground from the live pole of the power source must
be within the following rated operating voltage:
For Cat. No. TTR310/ TTR310E 120 V 10%, single phase, 60 2 Hz
For Cat. No. TTR310-47/ TTR310E-47 230 V 10%, single phase, 50 2 Hz
The neutral pole must be at ground potential. Before making connection to the
power source, determine that the instrument rating matches the voltage of the
power source and has a suitable two-pole, three-terminal grounding type
connector.
The power input plug must be inserted only into a mating receptacle with a
ground contact. Do not bypass the grounding connection. Any interruption of
the grounding connection can create an electric shock hazard. Determine that the
receptacle is properly wired before inserting the plug.
For test sets energized with 230 V input, the neutral terminal of the input supply
cord (white or blue lead) must be connected to the neutral pole of the line power
source. The ground terminal of the input supply cord (green or yellow/green

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lead) must be connected to the protective ground (earth) terminal of the line
power source. The black or brown cord lead is the live (hot) lead.
To avoid electric shock hazard, operating personnel must not remove the
instrument from the case. Any repair or component replacement must be
performed by qualified service personnel.
The control circuits of the instrument are protected by two mains circuit fuses.
These fuses are replaceable by the operator. To avoid electric shock and fire
hazard, use only the fuse specified in Section 3, Specifications, that is identical in
respect to type, voltage rating and current rating. Refer to the Fuse Replacement
procedure in the Service section.
WARNING
Before replacing the fuses, disconnect the power input plug from
the live power source.
Megger has made formal safety reviews of the initial design and any subsequent
changes. This procedure is followed for all new products and covers areas in
addition to those included in applicable standards. Regardless of these efforts, it
is not possible to eliminate all hazards from electrical test equipment. For this
reason, every effort has been made to point out in this instruction manual the
proper procedures and precautions to be followed by the user in operating this
equipment and to mark the equipment itself with precautionary warnings where
appropriate. It is not possible to foresee every hazard which may occur in the
various applications of this equipment. It is therefore essential that the user, in
addition to following the safety rules in this manual, also carefully consider all
safety aspects of the test before proceeding.
Safety is the responsibility of the user.
Follow your company’s safety procedures.
Misuse of this high-voltage equipment can be extremely dangerous.
The purpose of this equipment is limited to use as described in this manual.
Do not use the equipment or its accessories with any device other than
specifically described.
Never connect the test set to energized equipment.
Do not use the test set in an explosive atmosphere.
Corrective maintenance must only be performed by qualified personnel who
are familiar with the construction and operation of the test set and the
hazards involved.
Refer to IEEE 510 - 1983, IEEE Recommended Practices for Safety in High-
Voltage and High-Power Testing, for additional information.

SAFETY
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If the test equipment is operated properly and all grounds correctly made, test
personnel need not wear rubber gloves. As a routine safety procedure, however,
some users require that rubber gloves be worn, not only when making
connections to the high-voltage terminals, but also when manipulating the
controls. Megger considers this an excellent safety practice.
Users of equipment should note that high-voltage discharges and other sources
of strong electric or magnetic field may interfere with the proper functioning of
heart pacemakers. Persons with heart pacemakers should obtain expert advice on
the possible risks before operating this equipment or being close to the
equipment during operation.
F WARNING
No user serviceable parts inside!
Refer all servicing to the factory or a qualified
authorized service company!
G CAUTION
Use only factory supplied mains cord!
Mains cord shall not be substituted!

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