Megger AVTMTTR100 User manual

AVTMTTR100-ENG
Rev. 6
Nov 2015
Instruction Manual AVTMTTR100
for
Single-Phase Handheld TTR
Transformer Turn Ratio Test Set
Catalog Nos. TTR100 and TTR100-1
High-Voltage Equipment
Read the entire manual before operating.
Aparato de Alto Voltaje
Antes de operar este producto lea este manual enteramente.
M
2621 Van Buren Ave
Norristown, PA 19403-2329
610-676-8500
www.megger.com

Single-Phase Handheld TTR
Transformer Turn Ratio Test Set
Instruction Manual

Copyright Notice
Copyright 2015 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.

AVTMTTR100-ENG Rev 6 Nov 2015 i
TABLE OF CONTENTS
INTRODUCTION............................................................................................................................. 1
Receiving Instructions................................................................................................1
General Information...................................................................................................1
SAFETY....................................................................................................................................... 5
SPECIFICATIONS .......................................................................................................................... 9
Electrical....................................................................................................................9
Environmental Conditions........................................................................................11
Physical Data...........................................................................................................11
DESCRIPTION............................................................................................................................. 13
Principle of Operation ..............................................................................................13
Controls, Indicators, and Connectors (Figure 4-1)...................................................13
SETUP AND CONNECTIONS.......................................................................................................... 17
General Instructions.................................................................................................17
Transformers ...........................................................................................................17
Single-Phase, Two-Winding Transformers ..............................................................18
Distribution Transformers with Two Secondary Windings........................................18
Current Transformers (CTs).....................................................................................21
T-Type Transformers...............................................................................................24
Connections and Vector Voltage Diagrams.............................................................25
OPERATION ............................................................................................................................... 53
General Operating Procedure..................................................................................53
Description of Menus and Test Screens..................................................................53
Quick Test Single Phase Transformer.....................................................................59
Quick Test Three Phase Transformer......................................................................60
Test T-Type Transformers.......................................................................................61
Full Test Single Phase Transformer.........................................................................62
Full Test Single Phase Tapped Transformer ...........................................................63

AVTMTTR100-ENG Rev 6 Nov 2015
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Full Test CTs ...........................................................................................................64
Full Test Regulator...................................................................................................64
Test Result Symbols................................................................................................65
Custom Configurations ............................................................................................66
System Setup ..........................................................................................................67
Error Messages........................................................................................................71
Use with the Optional Printer ...................................................................................74
Using COMLink Program.........................................................................................75
SERVICE.................................................................................................................................... 81
Maintenance ............................................................................................................81
Calibration................................................................................................................81
TTR100 Test Set Functional Test...........................................................................82
Battery Maintenance................................................................................................83
Troubleshooting.......................................................................................................85
Repair......................................................................................................................86
ORDERING INFORMATION AND SPARE PARTS LIST ........................................................................ 87
WARRANTY................................................................................................................................ 91

AVTMTTR100-ENG Rev 6 Nov 2015 iii
LIST OF ILLUSTRATIONS
Figure 4-1Single-Phase TTR Display & Control Panel....................................................................14
Figure 4-2.Top Side Connector Panel..............................................................................................15
Figure 5-1.Setup for Testing Single-Phase Transformer..................................................................19
Figure 5-2.Setup for Testing Single-Phase Autotransformer............................................................19
Figure 5-3.Setup for Testing Single-Phase, Type A (Straight Design) Step Voltage Regulator.......20
Figure 5-4.Setup for Testing Single-Phase, Type B (Inverted Design) Step Voltage Regulator ......20
Figure 5-5.Setup for Testing Unmounted Current Transformer........................................................22
Figure 5-6.Setup for Testing Taps on Multiple Tap CT.....................................................................22
Figure 5-7.Setup for Testing BCT Mounted on Single-Phase Two-Winding Transformer................23
Figure 6-1.Opening Display Screen..................................................................................................54
Figure 6-2.Main Menu Screen..........................................................................................................55
Figure 6-3.Transformer Configuration Screen..................................................................................56
Figure 6-4.Single Phase Transformer Configuration Screen...........................................................57
Figure 6-4a. Additional Single Phase Transformer Configuration Screen...........................................57
Figure 6-5. Three Phase Transformer Configuration Screen ............................................................58
Figure 6-5a.Three Phase Transformer Configuration Screen ...........................................................58
Figure 6-6.T - Type Transformer Configuration Screen....................................................................58
Figure 6-7.Transformer Rating Screen.............................................................................................59
Figure 6-8.TEST SETUP Screen......................................................................................................62
Figure 6-9.Custom Configs. Screen .................................................................................................66
Figure 6-10.SYSTEM SETUP Screen 1.............................................................................................67
Figure 6-11.SYSTEM SETUP Screen 2.............................................................................................68
Figure 6-12.SAVED READINGS Screen............................................................................................69
Figure 6-13a. Sample Test Report Header............................................................................................74
Figure 6-13b. Sample Single Phase Test Report ..................................................................................74
Figure 6-14.Report Printout................................................................................................................79

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iv
LIST OF TABLES
Table 5-1. ANSI Transformer Winding Phase Relationship .............................................................24
Table 5-2.ANSI Transformer Winding Phase Relationship .............................................................27
Table 5-3.CEI/IEC 76-1:2011 Transformer Winding Phase Relationship........................................37
Table 5-4.Transformer Winding Phase Relationship (Australian Std. 2374, Part 4 - 2003)............47
Table 6-1. Self-test Error Messages.................................................................................................71
Table 6-2. Test Error Messages.......................................................................................................72
Table 6-3. Test Result Error Messages............................................................................................73
Table 6-4. Miscellaneous Messages................................................................................................73
Table 7-1.Troubleshooting Guide....................................................................................................85

AVTMTTR100-ENG Rev 6 Nov 2015 1
1
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
G CAUTION
Charge battery ONLY when “CHARGE BATTERY” message or low
battery voltage symbol appears on display.
The TTR100 and TTR100-1 Single-Phase Handheld TTR®Test Sets are fully
automatic, self-checking, self-calibrating, menu-driven units. The TTR100-1 is a
newer model replacing plastic (on TTR100) with metal connectors on both the
leads and the instrument. The test set measures the turn ratio, phase shift,
excitation current, dc winding resistance and polarity of single and three phase
(phase by phase) distribution transformers, as well as power, potential & current
transformers. The Single-Phase Handheld TTR®Test Set is powered by
rechargeable NIMH batteries. The test set is a portable instrument housed in a
sturdy plastic case. A carrying case with strap and an accessory pouch is
provided with the test set.
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 standards. For three-phase transformers, the test set is connected to
each of the three phases of the transformer to be tested, and measurements are
made on a phase by phase basis.

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AVTMTTR100-ENG Rev 6 Nov 2015
2
Turn ratio, phase shift, excitation current, dc winding resistance readings,
transformer vector group, and polarity 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 internally within the
test set, 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 either degree or centiradian), excitation current,
vector group (1PH0 or 1PH6), dc winding resistance and polarity.
Easy measuring of single and three phase (phase by phase) transformers, as
well as potential & current transformers.
Storage capacity for up to 200 tests results for retrieving, printing out, or
uploading to a PC.
Saving up to 100 custom transformer settings for faster and easier testing.
Checking reverse connections at start of each test.
External optional 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.
Two auto selected excitation test voltages: 8 V, and 1.5 V.
Testing to ANSI, IEC, or Australian standards.
Leads marked to ANSI, IEC, and Australian standards.
Choice of six languages.