Megger TRS1 User manual

User Manual
TRS1
Transformer Ratio
Standard
99 Washington Street
Melrose, MA 02176
Phone [phone]
Toll Free 1-800-517-8431
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TRS1
Transformer Ratio Standard
User’s 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 reproduced 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 informational 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 mentioned in this
document are trademarks or registered trademarks of their respective companies.
Megger Valley Forge is certified according to ISO 9001

Contents
Introduction................................................................. 1
1.2 Product overview ..................................................... 1
1.3 Control, input, output ............................................. 1
Safety........................................................................... 2
1.1 Responsible User...................................................... 2
1.2 Symbols................................................................... 2
1.3 General Precautions................................................. 2
Specifications .............................................................. 3
Perparing to test ......................................................... 4
4.1 Site preparations...................................................... 4
4.2 Connecting to TRS1................................................. 4
Operation .................................................................... 5
Service.......................................................................... 6
6.1 Troubleshooting ....................................................... 6
6.2 Maintenance............................................................ 6
6.3 Calibration............................................................... 6
6.4 Repairs..................................................................... 6
Appendix ..................................................................... 7
A.1 TTRU3 ..................................................................... 7
A.2 TTR 550503 / TTR3XX Series.................................... 7
A.1 550005B (Hand Crank)............................................ 7

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 TRS1® is a unit designed to be used with ratio meters
as a high accuracy reference ratio standard. This unique
standard is able to provide ratios in both step down
(traditional ratio test instruments) and step up (Biddle
Hand Crank TTR) test modes. The standard is designed for
use as a laboratory calibration standard, or as a portable
check standard for field ratio and phase verification of any
ratio instruments.
1.3 Control, input, output
1. Calibration reference
2. H*- Terminal for H1/1U/A lead. P/C = potential/current
3. H- Terminal for H2/1V/B lead. P/C = potential/current
4. Ratio selection switch
Enables different ratios for step down or step up
5. Quick start guide
6. Step down/up toggle switch
Enable excitation from H or X leads (step down/up)
7. X* - Terminal for X1/2U/a lead. P/C = potential/current
8. X- Terminal for X2/2V/b lead. P/C = potential/current
5
1
2
3
4
6
7
8
INTRODUCTION
1
Information subject to change without notice 1

1.1 Responsible User
Only qualified and trained operators should operate the
TRS1. Operator must read and understand this entire
Instruction Manual prior to operating the equipment.
Operator must follow the instructions of this Instruction
Manual and attend the equipment while the equipment
is in use. In the event of equipment malfunction, the unit
should immediately be de-energized and returned to
Megger for repair. The Safety precautions herein are not
intended to replace your Company’s Safety Procedures.
Refer to IEEE 510 - 1983, IEEE Recommended Practices
for Safety in High- Voltage and High-Power Testing, for
additional information
1.2 Symbols
Caution, possibility of electric shock
Observe the following safety precautions:
n Observe all safety warnings on the equipment.
They identify areas of immediate hazard that
could result in injury or death.
n Use this equipment only for the purposes
described in this manual. Observe strictly the
Warning and Caution information provided in
this manual
n Treat all terminals of the TRS1 and high-
voltage power equipment systems as potential
electric shock hazards. Use all practical safety
precautions to prevent contact with energized
parts of the equipment and related circuits.
n Use suitable barriers, barricades, or warnings to
keep persons not directly involved with the work
away from test activities.
n Never connect the test equipment to energized
equipment.
n Do not use in an explosive atmosphere.
n Use the grounding and connection procedures
recommended in the ratio meter manual. The
ground connection must be the first made
and the last removed. Any interruption of the
grounding connection can create an electrical
shock hazard.
n Personnel using heart pacemakers should obtain
expert advice on the possible risks before
operating this equipment or being close to the
equipment during operation
The TRS1 and the ratio meter should both
be considered sources of instantaneously
lethal levels of electrical energy.
!
1.3 General Precautions
X
SAFETY
2
2 TRS1 User Manual

Physical Data
Dimensions 5.6875 H x 12 W x 10.625 D in
(144 H x 304 W x 270 D mm)
Weight 12lbs (5 kg)
Electrical
Input Frequency 50 to 240 Hz
Step Down Voltage Input < 275V AC
Step Up Voltage Input < 8V AC
Max Loading < 5VA
Regulatory
Safety IEC 61010
Vibration/Drop/Shock MIL-STD-810G
Environmental
Operating Temperature Range 14°F to 122°F (-10°C to 50°C)
Storage Temperature Range -22°F to 158°F (-30°C to 70°C)
Relative Humidity 0 to 90% Noncondensing
IP Rating 54
Ratios
From Calibration Report @ Max V
Mode Ratios Ratio Accuracy Phase Accuracy
Down 1:1, 2:1, 4:1, 8:1, 16:1, 32:1, 64:1, 128:1 ±0.0125% ±3 minutes
256:1, 512:1, 1024:1, 2048:1 ±0.0125% ±10 minutes
Up 1:1, 2:1, 4:1, 8:1, 16:1, 32:1 ±0.0125% ±3 minutes
3SPECIFICATIONS
Information subject to change without notice 3

X
PREPARING
FOR TEST
4
4.1 Site Preparation
Choose a location that meets the following conditions:
N The location is as dry as possible
N There is no flammable material stored in the
vicinity
N The test area is adequately ventilated
N The test area is flat surface
N Be sure all equipment is de-energized. Erect
suitable safety barriers to protect the operator
from traffic hazards and to prevent intrusion by
unauthorized personnel. User provided Warning
lights are recommended
N Verify that the Local station ground is intact and
has impedance continuity to earth
4.2 Connecting to TRS1
See Appendix for instrument specific connections
Connections should be made in the order listed below:
1. Turn off the ratio meter intended to measure the TRS1
2. Disconnect leads from the ratio meter
3. Place the TRS1 in an upright position on a flat surface
and open the lid
4. Connect leads to TRS1
5. Connect H1 (or equivalent) to TRS1 H
6. Connect H2 (or equivalent) to TRS1 H
7. Connect X1 (or equivalent) to TRS1 X
8. Connect X2 (or equivalent) to TRS1 X
9. Connect the leads to the ratio meter
For Kelvin leads, connect potential to P and Current
to C. For non-Kelvin leads, connect clamp across both
terminals.
4 TRS1 User Manual

1. Use the toggle switch to select Step Down or Step Up
operation (available for TRS1+)
2. Use the ratio selection switch to select the ratio for the
ratio meter to measure
3. Following the manual for the ratio meter, execute a
single phase ratio test
Ensure the ratiometer is not applying
voltage to the TRS1
!
1INTRODUCTION
PREPARING
FOR TEST 5OPERATION
Information subject to change without notice 5

6.1 Troubleshooting
The Troubleshooting Guide is arranged to help you
evaluate the reasons for TRS1 malfunction. The possible
test set malfunctions and causes are listed below.
Electronic circuit repairs should not be attempted in the
field. Refer to Repair section.
Unit is not providing Step Down Ratios
n Toggle switch in incorrect position
n Ratio meter leads incorrectly connected
n Ratio meter sourcing more than 300VAC
n Problem with ratiometer
Unit is not providing Step Up Ratios
n Toggle switch in incorrect position
n Ratio meter leads incorrectly connected
n Ratio meter sourcing more than 8VAC
n Problem with ratiometer
6.2 Maintenance
Maintenance should be performed only by qualified
persons familiar with the hazards involved with
highvoltage test equipment. Read and understand Sections
1, 2, 3, 4, and 5 before performing any service.
The TRS1 requires only periodic inspection. Inspect all
hardware items to ensure all are in good condition.
The TRS1 may be cleaned periodically. In so doing, do
not allow water to penetrate panel holes. An allpurpose,
household spray cleaner can be used to clean the panel.
Polish with a soft, dry cloth. Clean the cables and mating
panel receptacles with isopropyl or denatured alcohol
applied with a clean cloth.
6.3 Calibration
A complete performance and calibration check should be
made at least once every year. This will ensure that the
TRS1 is functioning properly over the entire measurement
range. The TRS1 calibration is performed on each new or
repaired unit before sending it to a customer.
6.4 Repairs
Any service or repair of this equipment should be
performed only by qualified persons who are aware of
electrical hazards and the necessary precautions required
to prevent injury.
Megger offers a complete Repair and Calibration Service
and recommends that its customers take advantage of
this service for routine maintenance or in the event of any
equipment malfunction.
In the event Service is required, contact your Megger
representative for a product Return Authorization (RA)
number and shipping instructions.
Ship the product prepaid and insured and marked for
the attention of the Megger Repair Department. Please
indicate all pertinent information, including catalog
number, serial number, and problem symptoms.
X
6SERVICE
6 TRS1 User Manual