Megger TTRU3 User manual

TTRU3
True 3Ø Transformer Turns Ratiometer
USER MANUAL

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Information subject to change without notice 3
TTRU3
True 3Ø Transformer Turns Ratiometer
User Manual
NOTICE OF COPYRIGHT & PROPRIETARY RIGHTS
© 2016-2018, Megger Valley Forge. All rights reserved.
The contents of this manual are the property of Megger Valley Forge. No part of this work may be repro-
duced or transmitted in any form or by any means, except as permitted in written license agreement with
Megger Valley Forge. Megger Valley Forge has made every reasonable attempt to ensure the completeness
and accuracy of this document. However, the information contained in this manual is subject to change
without notice, and does not represent a commitment on the part of Megger Valley Forge. Any attached
hardware schematics and technical descriptions, or software listings that disclose source code, are for infor-
mational purposes only. Reproduction in whole or in part to create working hardware or software for other
than Megger Valley Forgeproducts is strictly prohibited, except as permitted by written license agreement
with Megger Valley Forge.
TRADEMARK NOTICES
Megger®is trademark registered in the U.S. and other countries. All other brand and product names men-
tioned in this document are trademarks or registered trademarks of their respective companies.
Megger Valley Forge is certified according to ISO 9001
Address:
Megger Valley Forge
2621 Van Buren Ave
Norristown, PA 19403 USA
T [phone] [e-mail]
F [phone] www.megger.com
Document Version: TTRU3_UG_EN_v01

Contents
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Contents
1 Introduction....................................................6
1.1 Receipt of product .........................................6
1.2 Product overview ...........................................6
1.3 Step Up vs Step Down ...................................6
1.4 Model Variation & Accessories .......................7
1.5 Top Panel.......................................................8
1.6 Side Panel......................................................9
1.7 Quick Start & Feet..........................................10
2 Safety..............................................................12
2.1 Responsible User............................................12
2.2 Symbols.........................................................12
2.3 General Precautions.......................................12
2.4 Input Power Precautions ................................13
3 Specifications .................................................14
4 Preparing for test...........................................14
4.1 Site preparations............................................16
4.2 Making Circuit Connections...........................17
4.3 PC Software Installation.................................18
4.4 PC Software Update ......................................19
4.5 PowerDB Installation......................................19
5 Operation .......................................................20
5.1 Initialization & Interface .................................20
5.2 Options..........................................................20
5.3 Confirm/Cancel..............................................20
5.4 Menu Bar.......................................................20
5.5 Home Screen .................................................21
5.6 Help Screen ...................................................21
5.7 Settings Screen ..............................................23
5.8 Measurement & Limits ...................................24
5.9 Transformer Nameplate..................................24
5.10 Regional ......................................................27
5.11 Display.........................................................28
5.12 OLTC ...........................................................29
5.13 Administrative Settings ................................30
5.14 Quick Test Setup ..........................................30
5.15 Test in Progress ............................................31
5.16 Test Failed ....................................................31
5.17 Test Success .................................................32
5.18 OLTC Tap Change Home Screen...................34
5.19 New Test Plan ..............................................36
5.20 Auto OLTC Test in Progress...........................40
5.21 Test failed ....................................................41
5.22 Test plan results ...........................................42

Information subject to change without notice 5
Contents
5.23 Magnetic Balance Test Setup........................44
5.24 Results.........................................................48
5.25 Simulation Mode .........................................51
5.26 PowerDB 3Ø Form ......................................52
6 Service.............................................................54
6.1 Troubleshooting.............................................54
6.2 Maintenance..................................................55
6.3 Calibration.....................................................55
6.4 Repairs...........................................................55

X
1INTRODUCTION
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1.1 Receipt of product
Prior to operation, check for loosened hardware or
damage incurred during transit. If these conditions
are found, a safety hazard is likely, DO NOT attempt
to operate equipment. Please contact Megger as
soon as possible.
1.2 Product overview
The TTRU3 ratio meter test set is a fully automatic,
self-checking, menu-driven turns ratiometer. The
test set measures the turns ratio, vector relationship,
excitation current as well as transformer diagnostic
health indicators of power, distribution, and instru-
ment transformers. The design of this instrument is
such that it operates properly, independent of line
voltage quality and frequency. This allows use of any
generator driven power source of 500W or higher.
The test set is a lightweight portable instrument
housed in a sturdy plastic case and comes complete
with a canvas carrying bag 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 and IEC 60076-1 standards. For
three-phase measurements, the test set is connected
to all three phases of the transformer to be tested.
The TTRU3 applies all three phases simultaneously
which permits automatic measurement of all phases
without changing connections. The TTRU3 is also
designed to operate single phase on three phase
transformers to help isolate transformer phase re-
lated issues. The TTRU3 measures turns ratio, phase
deviation and excitation current readings which
are displayed on the built in 7 inch color display or
customer PC.
1.3 Step Up vs Step Down
Unlike other transformer ratiometers, the TTRU3
operates in both step up and step down ratio mode.
Step down ratio excites the primary and measures
the induced voltage on the secondary, while step
up excites the secondary and measures the induced
voltage on the primary.
The advantage to step up ratio testing is the ability
to overcome voltage dependence exhibited by large
transformers. As transformers grow in size, more
voltage is required to generate flux. The TTRU3
manages this electrical phenomenon by using the
transformers construction to achieve sufficient flux.

1.4 Model Variation & Accessories
The TTRU3 is available with different hardware
and software configurations. Verify the model you
received is the model that was ordered by observing
the labels on the outside of the instrument and the
version information displayed on the Help screen.
Use the ordering information table below to confirm
that all included accessories, optional accessories,
and required accessories were delivered with your
TTRU3.
ORDERING INFORMATION
Item (Qty) Cat. No. Item (Qty) Cat. No.
3Ø Transformer Turns Ratio Test Set
TTRU3-EXP
TTRU3-PRO
TTRU3-ADV
ADV/PRO Software Options
TTRU3-EXP includes all software options and will receive
automatic activation of new features upon their release
Included Accessories All Automation SW SW-AUTOKIT
AC Adapters & Power Cord - 2.5m (8ft) 2009-874 PowerDB Control SW-POWERDB
USB 2.0 Cable CA-USB Auto OLTC SW-AUTOOLTC
OLTC Tap Changer cable - 9m (30ft) 1011-622 Custom App Control SW-CUSTOMAPP
Cable bag - backpack 2012-180 All Versatile SW SW-VERSATILEKIT
Ground Cable - 5m (16ft) 1011-352 Phase Shifting SW-PHASESHIFT
Thumb Drive 1011-585 Magnetic Balance SW-MAGNETICBAL
Triple Function Pen 2011-538 Optional Hardware Accessories
Required Lead Accessories 1:1 Test Jig 2005-249
Lead P/Ns 2008-XXX-XX (8 total) can be used with the TTRU3 and qual-
ify as required accessories Safety Beacon – 18m (60ft) 1004-639
3Ø universal shielded test lead sets compatible with MTO3XX,
MWA3XX, TTRU3 instruments (up to 10A max), complete with
color-coded Kelvin Clamps: Choose Kit or mix & match H & X
Transit Case (for instrument) 2012-236
TRS1+ Calibration Standard TRS1PLUS
5m (15ft) H & X 2008-15KIT2 TRS1D Calibration Standard TRS1D
9m (30ft) H & X 2008-30KIT2 Calibration Certificate CERT-NIST
18m (60ft) H & X 2008-60KIT2 USB Printer 90029-573
30m (100ft) H & 18m (60ft) X 2008-100KIT2 USB Printer Paper (x48 rolls) 90029-573-P
5m (15ft) H 2008-300-15 OLTC Tap Changer cable
adapters 1011-622-A
5m (15ft) X 2008-301-15 Optional Lead Accessories
9m (30ft) H 2008-300-30 9m (30ft) H extensions 2008-300-30X
9m (30ft) X 2008-301-30 9m (30ft) X extensions 2008-301-30X
18m (60ft) H 2008-300-60 9m (30ft) H &
9m (30ft) X extensions 2008-30XKIT2
18m (60ft) X 2008-301-60
30m (100ft) H 2008-300-100
Introduction
Information subject to change without notice 7

6. Fan
Automatically enabled when internal tempera-
ture exceeds factory limit.
7. Warning Indicator
Indicates when voltage is applied to test leads.
8. Manual OLTC Control Switch
Controls connected OLTC tap changer up/down.
Requires OLTC cable connected to transformer.
9. Touchscreen
Primary GUI control interface. Designed for out-
door (1100 NITS) and industrial environments.
10. Rotary and Directional Control Knob
Supplemental GUI control interface.
1.5 Top Panel
1. Speaker
Used for sounding countdown for test.
2. AUX Port
Used for connecting auxiliary equipment.
3. USB On the Go
TTRU3 appears as a thumb drive containing PC
SW, user manual, and data sheet.
Enables PC Control after PC SW Installed.
4. USB A
Print, export
5. Emergency Stop
Used to immediately interrupt voltage output.
Prevents tests from starting if engaged.
Rotate clockwise to disengage.
Introduction
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Information subject to change without notice 9
15. Beacon Connection
Optional accessory
Functions similar to Warning Indicator
16. Side panel reference
Quick reference for the various connections
1.6 Side Panel
11. Power Input
IEC 320 interface to mains power.
Integrated fuse holder and filter.
O = Off
I = On
12. OLTC Connection
Used in conjunction with Manual OLTC Control
13. Ground
14. Lead Connections
Latching connectors (press tab to release)
Color coded windings
silver/black for primary/secondary
Color coded phases
red, gold, blue, white
Introduction

18. Feet
Rotate out to provide a better viewing angle.
17. Quick Start Guide
Safety and connection reference in lid.
1.7 Quick Start Guide
17
18
Introduction
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