Megger TTR 550503 User manual

AVTM550503
Rev E
March2005
Instruction Manual AVTM550503
for
Three-Phase TTR
Transformer Turn Ratio Test Set
Catalog No. 550503
High-Voltage Equipment
Read the entire manual beforeoperating.
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
Transformer Turn Ratio Test Set
Instruction Manual

Copyright Notice
Copyright1999 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.

TABLE OF CONTENTS
INTRODUCTION................................................................................................................................................................. 1
Receiving Instructions....................................................................................................................................... 1
General Information.......................................................................................................................................... 1
SAFETY ................................................................................................................................................................................ 3
SPECIFICATIONS................................................................................................................................................................ 7
Electrical............................................................................................................................................................... 7
Environmental Conditions............................................................................................................................... 9
Physical Data..................................................................................................................................................... 10
Accessories Supplied ....................................................................................................................................... 10
Optional Accessories....................................................................................................................................... 11
DESCRIPTION................................................................................................................................................................... 13
Principle of Operation .................................................................................................................................... 13
TTR Operational Flow Chart........................................................................................................................ 15
Controls, Indicators, and Connectors ......................................................................................................... 19
SETUP AND CONNECTIONS .......................................................................................................................................... 21
General Instructions........................................................................................................................................ 21
Single-Phase, Two-Winding Transformers ................................................................................................ 21
Three-Phase, Two-Winding Transformers................................................................................................ 24
Three-Phase, Three-Winding Transformers.............................................................................................. 25
Current Transformers (CTs).......................................................................................................................... 26
T-Type Transformers...................................................................................................................................... 32
Connections and Vector Voltage Diagrams .............................................................................................. 33
OPERATION...................................................................................................................................................................... 65
General Operating Procedure....................................................................................................................... 65
Description of Menus and Test Screens..................................................................................................... 65
Error Messages ................................................................................................................................................. 85

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Remote Control Operation for LTC Testing............................................................................................86
Use with the Optional Printer.......................................................................................................................87
Use with the Optional Inverter.....................................................................................................................88
COMLINK ........................................................................................................................................................................91
Introduction.......................................................................................................................................................91
Installation & Upgrade Instructions ............................................................................................................92
Three Phase TTR COMLink Operations.................................................................................................101
COMLink Simulation Mode of Operation...............................................................................................125
Three Phase TTR Remote Control Operations......................................................................................127
SERVICE...........................................................................................................................................................................169
Maintenance.....................................................................................................................................................169
Fuse Replacement...........................................................................................................................................169
Calibration........................................................................................................................................................170
3-Phase TTR Test Set Functional Test....................................................................................................170
Troubleshooting..............................................................................................................................................172
Repair.................................................................................................................................................................173
ORDERING INFORMATION AND SPARE PARTS LIST .............................................................................................175
Ordering Information....................................................................................................................................175
Spare Parts........................................................................................................................................................177
GLOSSARY.......................................................................................................................................................................179
INDEX ..............................................................................................................................................................................181

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LIST OF ILLUSTRATIONS
Figure 4-1. Three-Phase TTR Test Set Block Diagram................................................................................. 14
Figure 4-2. Quick Test flow chart....................................................................................................................... 15
Figure 4-3. Full Test Setup with Recall Custom Settings .............................................................................. 16
Figure 4-4. System Setup Menu........................................................................................................................... 17
Figure 4-5. Saved Data Menu with Print Header ............................................................................................ 18
Figure 4-6. Three-Phase TTR Control Panel ...................................................................................................19
Figure 4-7. Left Side Connector Panel............................................................................................................... 20
Figure 4-8. Right Side Connector Panel ............................................................................................................ 20
Figure 5-1. Setup for Testing Single-Phase Transformer.............................................................................. 22
Figure 5-2. Setup for Testing Single-Phase Autotransformer ...................................................................... 22
Figure 5-3. Setup for Testing Single-Phase, Type A (Straight Design) Step Voltage Regulator.......... 23
Figure 5-4. Setup for Testing Single-Phase, Type B (Inverted Design) Step Voltage Regulator......... 24
Figure 5-5. Setup for Testing Unmounted Current Transformer ............................................................... 28
Figure 5-6. Setup for Testing Taps on Multiple Tap CT............................................................................... 28
Figure 5-7. Setup for Testing BCT Mounted on Single-Phase Two-Winding Transformer................. 29
Figure 5-8. Setup for Testing BCT Mounted on Delta Winding on a Three-Phase Power
Transformer ........................................................................................................................................ 30
Figure 5-9. Setup for Testing BCT Mounted on Wye Winding of a Three-Phase Transformer......... 31
Figure 5-10. Winding Connections and Phase Relationship........................................................................... 35
Figure 6-1 Opening Display Screen................................................................................................................... 66
Figure 6-2. Main Menu Screen............................................................................................................................. 67
Figure 6-3. Quick Test Setup Screen.................................................................................................................. 69
Figure 6-4. Initial Quick Test Result Screen..................................................................................................... 70
Figure 6-5. Final Quick Test Result Screen ...................................................................................................... 71
Figure 6-6. FULL TEST SETUP 1 Screen.......................................................................................................72
Figure 6-7. FULL TEST SETUP 2 Screen.......................................................................................................74
Figure 6-8. FULL TEST SETUP 3 Screen.......................................................................................................76
Figure 6-9. Three-Phase Transformer Test Result Screen............................................................................ 77
Figure 6-10. Phase A Test Result Screen............................................................................................................. 79
Figure 6-11. The Main Menu Screen After Selection of a Custom Transformer Setting ........................ 80
Figure 6-12. SYSTEM SETUP Screen................................................................................................................. 81

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Figure 6-13. Language Screen.................................................................................................................................82
Figure 6-14. SAVED DATA Screen.....................................................................................................................83
Figure 6-15. Recall (or Save) Custom Settings Screen......................................................................................84
Figure 6-16a. Sample Test Report Header...............................................................................................................87
Figure 6-16b. Sample Single Phase Test Report.....................................................................................................87
Figure 6-16c. Sample Three Phase Test Report.....................................................................................................88
LIST OF TABLES
Table 5-1. Test Lead Markings for Single-Phase Transformers .................................................................23
Table 5-2. Test Lead Markings for Three-Phase Transformers .................................................................25
Table 5-3. T-type Transformer Winding Phase Relationship......................................................................32
Table 5-4. ANSI Transformer Winding Phase Relationship.......................................................................38
Table 5-5. CEI/IEC 76-1:1993 Transformer Winding Phase Relationship............................................48
Table 5-6. Transformer Winding Phase Relationship (Australian Std. 2374, Part 4 - 1982) ...............59
Table 7-1. Troubleshooting Guide ..................................................................................................................172

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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.
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.

AVTM550503 Rev E March 2005 vi
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 COMLink software appears defective or if you need assistance in the operation of
the COMLink software, call the MEGGER SUPPORT DEPT at [phone]. The Megger Support
Dept will determine the necessary support to correct the problem.

AVTM550503 Rev E March 2005 vii
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] Ask for Sales
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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ii
i
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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Introduction
Receiving Instructions
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.
General Information
The Three-Phase TTR®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 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 – 1997
standards. For three-phase measurements, the test set is connected to all three phases of
the transformer to be tested. The TTR 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).

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AVTM550503 Rev E March 2005 2
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.
Y2K compatible date setting.
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.
Three excitation test voltages: 80 V, 40 V, and 8 V.
Testing to ANSI, IEC, or 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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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 550503 120 V ±10%, single phase, 50/60 ±2 Hz
For Cat. No. 550503-47 230 V ±10%, single phase, 50/60 ±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.

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AVTM550503 Rev E March 2005 4
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 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 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.

SAFETY
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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.
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.

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AVTM550503 Rev E March 2005 6
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Specifications
Electrical
Input Power
Cat. No. 550503: 120 V ac ±10%, single phase, 50 ±2 Hz or 60 ±2 Hz, 100 VA
IEC 1010-1 installation category II
Cat. No. 550503-47: 230 V ac ±10%, single phase, 50 ±2 Hz or 60 ±2 Hz, 100 VA
IEC 1010-1 installation category II
Pollution Degree
TTR is designed for Pollution Degree II
Protective Devices
Fuses (2)*:
Cat. No. 550503: Type T, 250 V, 1A (IEC 127 designation)
Cat. No. 550503-47: Type T, 250 V, 0.5 A (IEC 127 designation)
High voltage and low voltage measurement circuit shorting relays
Heavy duty varistors, transient voltage suppressors, and gas surge voltage protectors
* Two spare fuses are included with each TTR as spare parts

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Output Test Voltage and Current
3 test voltages: 80 V rms, 40 V rms, 8 V rms.
Current: up to 500 mA
Test Frequency
Same as line frequency.
Loading of Test Transformer
Less than 0.2 VA
Measuring Ranges
Turn ratio: 80 V ac: 0.8 to 45,000, 5 digit resolution
40 V ac: 0.8 to 25,000, 5 digit resolution
8V ac: 0.8 to 8,000, 5 digit resolution
Current: 0 to 500 mA, 3 digit resolution
Phase deviation: ± 90 degrees, 1 decimal point for the minutes display, 2
decimal point for the degree display, 2 decimal points for the
centiradian display
Accuracy
Turn ratio:
80 V ac: ±0.1% (0.8 to 2000)
±0.15% (2001 to 4000)
±0.25% (4001 to 10000)
±0.3% (10001 to 45000)
40 V ac: ±0.1% (0.8 to 2000)
±0.15% (2001 to 4000)
±0.3% (4001 to 10000)
±0.35% (10001 to 25000)
8 V ac: ±0.1% (0.8 to 2000)
±0.25% (2001 to 4000)
±0.35% (4001 to 8000)
Current (rms): ±(2% of reading + 1 digit)
Phase deviation: ±3 minutes