Megger MRCT User manual

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MEGGER RELAY AND CURRENT TRANSFORMER TEST
INSTRUMENT
MRCT USER MANUAL
February 26, 2016
Part#82950R5

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IMPORTANT
This manual, as well as the hardware and software described in it, is furnished under license and may be
used or copied only in accordance with the terms of such license. The content of this manual is
furnished for informational use only, is subject to change without notice. Megger assumes no
responsibility or liability for any errors or inaccuracies that may appear in this manual.
The information and data in this User Manual are proprietary. The equipment described herein may be
protected by U.S. patents. Megger specifically reserves all rights to such proprietary information as well
as rights under any patent, none of which is waived by the submission of this user manual.
Except as permitted by such license, no part of this publication may be reproduced, stored in a retrieval
system, or transmitted, in any form or by any means, electronic, mechanical, recording, or otherwise,
without the prior written permission of Megger.
Megger, the Megger logo are trademarks of Megger. All other trademarks are the property of their
respective owners.
Notice to U.S. government end users. The hardware, software and documentation are “commercial
items”, as that term is defined at 48 C.F.R. §2.101, consisting of “commercial computer software” and
“commercial computer software documentation,” as such terms are used in 48 C.F.R. §12.212 or 48
C.F.R. §227.7202, as applicable. Consistent with 48 C.F.R. §12.212 or 48 C.F.R. §§227.7202-1 through
227.7202-4, as applicable, the commercial computer software and commercial computer software
documentation are being licensed to U.S. government end users (1) only as commercial items and (2)
with only those rights as are granted to all other end users pursuant to the terms and conditions set
forth in the Megger standard commercial agreement for this software and hardware. Unpublished
rights reserved under the copyright laws of the United States. The recipient, if a Government agency,
acknowledges that this manual and the equipment described were procured with "Limited Rights" to
technical data as described in ASPR 9-203 (b).
The STVI includes an RTOS-resident computer program. This program belongs to Megger and contains
trade secret ideas and information of Megger.
Written and designed at Megger, 4271 Bronze Way, Dallas, Texas 75237.
__________________________
Printed in the USA.
2013 Megger, all rights reserved.

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SAFETY PRECAUTIONS
WARNING:
VOLTAGES GENERATED BY THIS INSTRUMENT CAN BE HAZARDOUS
This instrument has been designed for operator safety; however, no design can completely
protect against incorrect use. Electrical circuits are dangerous and can be lethal when lack of
caution and poor safety practices are used. There are several standard safety precautions that
should be taken by the operator. Where applicable, IEC safety markings have been placed on the
instrument to notify the operator to refer to the user manual for instructions on correct use or
safety related topics. Refer to the following table of symbols and definitions.
Symbol
Description
Direct Current
Alternating Current
Both direct and alternating current
Earth (ground) Terminal. There is a common chassis ground terminal
located on the front panel (see Front panel under Description of Controls.
Protective Conductor Terminal
Frame or Chassis Terminal
On (Supply)
Off (Supply)
Caution, risk of electric shock
Caution (refer to accompanying documents)

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WARNING: Under no circumstances should the operator or technician attempt to open or
service any Megger instrument while connected to a power source. Lethal voltages are present and
may cause serious injury or death! SAFETY PRECAUTIONS (Continued)
The following are some specific safety related items associated with the MRCT test system.
Read and understand all safety precautions and operation instructions before attempting to use this
unit.
The purpose of this equipment is limited to use as described in this instruction manual. Should a
situation arise that is not covered in the general or specific safety precaution please contact Megger
regional representative or Megger, Dallas Texas.
Safety is the responsibility of the user. Misuse of this equipment can be extremely dangerous.
Always start with the power OFF, before connecting the power cord. Make sure outputs are off before
attempting to make test connections.
DO NOT attempt to connect the test set to energized equipment.
DO NOT attempt to connect the test set to Current Transformers unless the Primary Side of the Current
Transformer is grounded.
Always use properly insulated test leads. The optional test leads are rated for the continuous output
ratings of the test system, and should be properly used and cared for. DO NOT use cracked or broken
test leads.
Always turn the test system off before disconnecting the power cord.
DO NOT attempt to use the unit without a safety ground connected.
DO NOT attempt to use the unit if the power cord ground prong is broken or missing.
DO NOT use the test set in an explosive atmosphere.
The instrument must only be used by suitably trained and competent persons.

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Observe all safety warnings marked on the equipment.
For safety related or other important topics, like the statement below, will be notated with the adjoined
symbol. Read the topic carefully as it may relate either to the safe operation of the test system or the
safety of the operator.
Under no circumstances should the operator put their hand or tools inside the test
system chassis area with the test system connected to a power source. Lethal
voltages are present and may cause serious injury or death!
WEEE
The crossed out wheeled bin placed on Megger products is a reminder not to dispose of the product at
the end of its life with general waste.
Megger is registered in the UK as a Producer of Electrical and Electronic Equipment. The Registration No
is WEE/HE0146QT

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Megger
Table of Contents
Description ................................................................................................................................................................. 3
Table of Contents................................................................................................................ 6
List of Figures..................................................................................................................... 8
1.0 STVI Introduction................................................................................................... 10
1.1 Smart Touch View Interface............................................................................................................10
1.2 Terminology...........................................................................................................................................11
1.2.1 Acronyms ...................................................................................................................12
1.3 Power Over Ethernet Input Power...............................................................................................12
2.0 MRCT with Integrated Display ............................................................................. 13
3.0 Setup ....................................................................................................................... 14
3.1 Unpack System......................................................................................................................................14
3.1.1 Initial Start Up ............................................................................................................ 14
3.2 Communication Ports ........................................................................................................................14
3.2.1 Ethernet Port..............................................................................................................14
3.2.2 USB 2.0 Interface........................................................................................................15
3.3 Smart Touch View Interface............................................................................................................15
3.3.1 STVI Menu Items ........................................................................................................ 19
3.3.1.1 Device Connections .................................................................................................................19
3.3.1.2 Device Settings ..........................................................................................................................19
3.3.1.3 Nameplate Information .........................................................................................................22
3.3.1.4 Home Screen ..............................................................................................................................24
4.0 CT Testing ............................................................................................................. 25
4.1 Run All Tests........................................................................................................................................25
4.2 Manual Test..........................................................................................................................................26
4.3 Demagnetization................................................................................................................................30
4.4 Self Test..................................................................................................................................................32
4.5 Relay........................................................................................................................................................32
4.6 Saturation .............................................................................................................................................33
4.7 Ratio ........................................................................................................................................................34
4.8 Winding Resistance ...........................................................................................................................36
4.9 Insulation Test ....................................................................................................................................37
4.10 Burden ....................................................................................................................................................39
4.11 View CT Report ...................................................................................................................................40
4.12 Delete CT Data.....................................................................................................................................42
4.13 Report Configuration........................................................................................................................43
4.14 Excitation Curve Data.......................................................................................................................45
5.0 VT Testing Functions ............................................................................................ 47

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5.1 Ratio ...........................................................................................................................................................48
5.2 Winding Resistance..............................................................................................................................49
6.0 Functions Available for All Configuration.............................................................. 51
6.1 File Operations.......................................................................................................................................51
7.0 Service Data............................................................................................................. 53
7.1 Preventive Maintenance ...................................................................................................................53
7.1.1 Examine the unit every six months for: .....................................................................54
7.1.2 Upgrading STVI Software ...........................................................................................54
7.2 Service and Repair Instructions ....................................................................................................55
7.2.1 Basic Troubleshooting................................................................................................ 55
7.2.1.1 Power Input................................................................................................................................56
7.2.1.2 Ethernet Cable...........................................................................................................................56
7.2.1.3 Ratio Errors ................................................................................................................................56
8.0 Preparation for Reshipment................................................................................... 57
9.0 Step by Step Testing a CT with MRCT................................................................. 57
9.1 Test Plan Creation and Testing of CT ..........................................................................................57
9.2 CT Saturation Test...............................................................................................................................62
9.2.1 Method 1 –Concurrent .............................................................................................62
9.2.2 Method 2 –Non Concurrent or Testing a Single Tap.................................................66
9.3 CT Ratio Test..........................................................................................................................................69
9.3.1 Method 1 –Concurrent .............................................................................................69
9.3.2 Method 2 –Non Concurrent or Testing a Single Tap.................................................74
9.4 CT Winding Resistance Test:...........................................................................................................78
9.4.1 Method 1 –Concurrent .............................................................................................78
9.4.2 Method 2 –Non Concurrent or Testing a Single Tap.................................................82
9.5 CT Insulation Test: .............................................................................................................................86
9.6 CT Burden Test....................................................................................................................................89
9.7 Manual Test of CT ...............................................................................................................................93
9.8 CT Demagnetization ..........................................................................................................................96
10.0 Step by Step Testing a VT with MRCT.................................................................. 98
10.1 Voltage Transformer Ratio and Phase.......................................................................................98
10.2 Testing Voltage Transformer Secondary Winding Resistance .................................... 102
11.0 Self Test............................................................................................................... 105

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List of Figures
Figure 1: Smart Touch View Interface .................................................................................... 10
Figure 2: STVI Rear-View....................................................................................................... 11
Figure 3: MRCT with Integrated Display................................................................................. 13
Figure 4: STVI port on MRCT.................................................................................................. 14
Figure 5: Introduction Screen.................................................................................................... 15
Figure 6: Boot Up Home Screen CT only................................................................................. 16
Figure 7: Boot Up Home Screen for CT and VT...................................................................... 17
Figure 8: Device Settings.......................................................................................................... 20
Figure 9: Name Plate Data........................................................................................................ 22
Figure 10: Home Screen for CT Testing Only........................................................................ 24
Figure 11: Home Screen for CT and VT/ Testing................................................................... 24
Figure 12: Run All Test Screen............................................................................................... 25
Figure 13: Manual Test Screen................................................................................................ 26
Figure 14: Demagnetization Connection Diagram.................................................................. 31
Figure 15: Demagnetization Process....................................................................................... 31
Figure 16: Saturation Test Screen ........................................................................................... 33
Figure 17: Ratio Test Screen................................................................................................... 35
Figure 18: Winding Resistance Test Screen............................................................................ 36
Figure 19: Insulation Resistance Test Screen.......................................................................... 38
Figure 20: Burden Test Screen................................................................................................ 39
Figure 21: Customer Information............................................................................................ 40
Figure 22: Sample Test Report................................................................................................ 41
Figure 23: Sample Mutlitap CT Test Report........................................................................... 43
Figure 24: Ratio and Phase Error Tables................................................................................. 44
Figure 25: Report Configuration............................................................................................. 45
Figure 26: View Saturation Data............................................................................................. 46
Figure 27: Excitation Curve Data............................................................................................ 47
Figure 28: VT Testing Mode................................................................................................... 48
Figure 29: VT Ratio Test Screen............................................................................................. 48
Figure 30: VT Winding Resistance Test Screen ..................................................................... 50
Figure 31: File Operation Tool Bar......................................................................................... 51
Figure 32: File Manager Screen .............................................................................................. 52
Figure 33: Run All Tests - Configuration................................................................................ 59
Figure 34: Run All Tests - Multi Tap...................................................................................... 60
Figure 35: Connection Diagram 5 Tap Concurrent................................................................. 60
Figure 36: Saturation Testing Screen - Concurrent................................................................. 61
Figure 37: Testing Report - Concurrent .................................................................................. 62
Figure 38: Saturation Test Screen - Concurrent...................................................................... 63
Figure 39: Saturation Connection Diagram - Concurrent ....................................................... 64
Figure 40: Saturation Testing Screen –Concurrent ................................................................ 65
Figure 41: Saturation Results Screen - Concurrent.................................................................. 65
Figure 42: Saturation Test Screen –Non Concurrent ............................................................. 67
Figure 43: Saturation Connection Diagram - Non Concurrent ............................................... 68

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Figure 44: Saturation Test Screen Non Concurrent ................................................................ 69
Figure 45: CT Ratio Test Screen - Concurrent........................................................................ 71
Figure 46: CT Ratio Connection Diagram - Concurrent......................................................... 71
Figure 47: CT Ratio Test Abort............................................................................................... 72
Figure 48: CT Ratio Test Results - Concurrent....................................................................... 73
Figure 49: CT Ratio Test Screen –Non Concurrent............................................................... 75
Figure 50: CT Ratio Test Connection Diagram - Non Concurrent......................................... 76
Figure 51: CT Ratio Testing Screen –Non Concurrent.......................................................... 77
Figure 52: CT Ratio Test Results –Non Concurrent .............................................................. 78
Figure 53: CT Winding Test Screen –Concurrent.................................................................. 80
Figure 54: CT Winding Connection Diagram –Concurrent................................................... 80
Figure 55: CT Winding Test ABORT..................................................................................... 81
Figure 56: CT Winding Results - Concurrent ......................................................................... 82
Figure 57: CT Winding Test Screen –Non Concurrent.......................................................... 83
Figure 58: CT Winding Resistance Connection Diagram Non Concurrent............................ 84
Figure 59: CT Winding Test Screen –Abort ........................................................................... 85
Figure 60: CT Winding Results - Non Concurrent ................................................................. 85
Figure 61: CT Insulation Test Screen...................................................................................... 87
Figure 62: CT Insulation Test Connection Diagram............................................................... 87
Figure 63: CT Insulation Testing Screen................................................................................. 88
Figure 64: CT Insulation Test Results..................................................................................... 89
Figure 65: CT Burden Test Screen.......................................................................................... 90
Figure 66: CT Burden Test Connection Diagram ................................................................... 91
Figure 67: CT Burden Test Abort ........................................................................................... 92
Figure 68: CT Burden Test Results Screen............................................................................. 92
Figure 69: CT Manual Test Screen ......................................................................................... 94
Figure 70: CT Manual Test Connection Diagram................................................................... 95
Figure 71: CT Demagnetization Connection Diagram............................................................ 97
Figure 72: CT Demagnetizing Screen..................................................................................... 97
Figure 73: VT Ratio Test Screen............................................................................................. 99
Figure 74: VT Ratio Test Connection Diagram.................................................................... 100
Figure 75: VT Ratio Testing Screen...................................................................................... 101
Figure 76: VT Ratio Test Results.......................................................................................... 101
Figure 77: VT Winding Test Screen ..................................................................................... 103
Figure 78: VT Winding Resistance Connection Diagram..................................................... 103
Figure 79: VT Winding Test Screen –Abort........................................................................ 104
Figure 80: VT Winding Results ............................................................................................ 105
Figure 81: Self Diagnostic Connection Diagram .................................................................. 106
Figure 82: Self Diagnostic Test Screen................................................................................. 107
Figure 83: Testing bushing CT installed in a Power Transformer- A................................... 109
Figure 84: Testing bushing CT installed in a Power Transformer- B............................... 111

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1.0 STVI Introduction
STVI is a user friendly interface to control the Megger MRCT relay and current transformer test
equipment. This manual contains the information that you will need in order to set up and use your STVI
with the MRCT Test Systems. How the unit operates, some of the different types of testing you can do,
and how to save and view your test results with the Smart Touch View Interface software is described.
It also covers running the STVI software using the PowerDB software on your PC.
Information regarding MRCT units can be found in the addendums.
1.1 Smart Touch View Interface
Figure 1: Smart Touch View Interface

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1. TFT LCD Color Display –this 8.5 inch touch panel display provides high resolution, and features
Wide Viewing Angle Technology with high luminance for reading in direct sunlight.
2. Control Knob –this knob will adjust values once the box location of the value to be changed is
selected.
Figure 2: STVI Rear-View
3. Built-in Foldout Stand –the STVI may be operated as a handheld controller, or foldout the
built-in stand and use a desktop controller.
4. STVI Ethernet Port –this Ethernet port is a 10/100BaseTX PoE (Power over Ethernet) port, and
is the SMRT connection port.
5. USB Interface –the USB 2.0 Interface requires a Type A connector, and is primarily used as a
communication and control port. A USB cable is not provided with the test set or in the optional
accessories. For control of the SMRT, an Ethernet cable is provided since the STVI gets its power
over the Ethernet cable. Even though the STVI has a built-in virtual keyboard, the user can use a
USB keyboard with the STVI, as well as a mouse (including Logitech wireless mouse), keyboard
and/or mouse are not provided with the accessories. The USB port is also used to update the
firmware in the SMRT as well as update the software in the STVI using a USB memory stick. The
STVI USB port does not support memory sticks larger than 2 GB. It may also be used to
download test results from the STVI for download into another PC with Power DB software for
storage or printing.
1.2 Terminology
The acronyms, terms, and definitions used throughout this manual are described below:

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1.2.1 Acronyms
AC Alternating Current
CW Clockwise (rotation)
CCW Counter Clockwise (rotation)
DC Direct Current
GPS Global Position System
GUI Graphical User Interface
Hz Hertz
ID Identification
I/O Input/Output
kHz Kilo Hertz
LCD Liquid Crystal Display
LED Light Emitting Diode
MAG Magnitude
PC Personal Computer
ROM Read-Only Memory
STVI Smart Touch View Interface
USB Universal Serial Bus
VIGEN Voltage / Current Generator Module
VRMS Volts Root Mean Square
UUT Unit Under Test
1.3 Power Over Ethernet Input Power
The STVI gets Power Over Ethernet (PoE) of 48 Volts DC at 0.5 A from the MRCT.
CAUTION:
NOTE: The PoE power supply DC voltage is ON when the power supply is connected to a power
source. Connect the Ethernet cable to the Data & Power Out port of the PoE power supply to the STVI
Ethernet port prior to connecting to a power source.

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2.0 MRCT with INTEGRATED DISPLAY
Figure 3: MRCT with Integrated Display
The MRCT can also be ordered with an integrated display instead of using the STVI to control the unit.
The MRCT will have an 8.5 inch TFT LCD Color Display –this touch panel display provides high resolution,
and features Wide Viewing Angle Technology with high luminance for reading in direct sunlight. The
control knob typically located on the STVI is located on the front panel. During manual testing this knob
will adjust values once the box location of the value to be changed is selected.

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3.0 SETUP
3.1 Unpack System
Unpack the unit and check for evidence of any shipping damage. If there is any visual damage,
immediately notify the freight carrier to make a damage claim, and notify Megger of the damage.
3.1.1 Initial Start Up
1. If the unit was ordered with an STVI, using the Ethernet cable supplied with the unit connect the
STVI Ethernet Port on the MRCT unit to the Ethernet port on the top of the Smart Touch View
Interface (STVI).
2. Before connecting power to the unit, make sure the MRCT POWER ON/OFF Switch is in the OFF
position (0). Plug the unit line cord into an appropriate power source and turn the POWER
ON/OFF Switch to ON (I). As the MRCT unit goes through its power up sequence, in about a
minute the STVI power up screen will appear, then the test configuration screen will appear.
3.2 Communication Ports
There are two types of communication ports on the STVI, one Ethernet, and two USB ports.
3.2.1 Ethernet Port
There is one Ethernet port on the STVI for connecting to the MRCT units. On the MRCT the port is
labeled STVI. For the MRCT it connects to the PoE power supply unit, and the PoE unit is connected to
the PC/IN port on the MRCT
Figure 4: STVI port on MRCT

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3.2.2 USB 2.0 Interface
There are two USB 2.0 Interface ports on the STVI unit. These ports are used for upgrading firmware to
the MRCT unit, or upgrading the STVI software using a USB Memory Stick. They may also be used in
conjunction with a USB mouse for ease of manual control, even a USB wireless mouse maybe used with
the STVI.
Ethernet Port is a 10/100BaseTX port, and is the primary PC connection port. This port supports
MDI/MDI-X auto cross over configuration, which means both standard and “crossover” Ethernet cables
may be used. The SMRT comes standard with a crossover cable. This port may also be used to
interconnect multiple SMRT units together for synchronous multi-phase operation.
3.3 Smart Touch View Interface
Depending on how the unit was ordered, the MRCT can be controlled using the integrated display, an
STVI, or a personal computer using PowerDB Lite software. All three of these methods of control will
have the same user interface in the software and this will be outlined throughout.
For units being controlled with the integrated display or the STVI, the system will perform several self
checks upon power up. Once these checks are complete the Introduction Screen will appear, see the
following figure.
Figure 5: Introduction Screen
Shortly afterward the screen will change to the instrument connection screen if the MRCT is being
controlled with either an STVI or a laptop.

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The user should select the connection icon in the top left conner to connect to the MRCT. The user will
then be brought to the “Home Screen”. If the MRCT has an integrated display, after powering up the
MRCT, the user will be brought to the “Homes Screen” automatically. Depending upon how the MRCT
was configured the user will see the “Home Screen” for CT testing or the “Home Screen” for combined
CT and VT/CVT testing.
Figure 6: Boot Up Home Screen CT only

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Figure 7: Boot Up Home Screen for CT and VT
From either of the Home screens the user can navigate to the desired test screen. All individual test
screens and settings for the unit can also be accessed from this screen. By pressing the navigation
buttons on this screen, one can select the desired operation. Following are the user selectable
operations.
Device Connection
Device Settings
Name Plate Information
Run All Test s
Manual Test

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Demagnetization
“Self Diagnostic”
Relay
Saturation Test
Ratio Test
Winding Resistance Test
Insulation Test
Burden Test
User Help
The following are additional user selectable operations if the unit has been configured for VT/CVT
testing
. VT Testing Mode
VT Ratio Test

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VT Winding Resistance Test
CVT Testing Mode
CVT Ratio Test
The following navigation buttons will appear in the home screen after a test has been completed and
test data is available
View Test Report
Delete Test Data
File Manager
Refer to each menu item below for detailed description
3.3.1 STVI Menu Items
3.3.1.1 Device Connections
Selection of Device Connection button will initialize the connection of a PC to the MRCT
3.3.1.2 Device Settings
Selection of Device Settings, brings the user the following screen.

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Figure 8: Device Settings
Within this screen all device settings are accessible. By selecting the appropriate button, the user can:
Saturation Standard: Select between ANSI 45, ANSI 30, IEC 60044-1, IEC6044-6, or IEC61869
Color Options: Select the desired colors for Background color, Grid color, Label color,
Knee Marker color, and Saturation traces
Tolerance Settings: Displays the ratio and phase error limits specified by either ANSI or IEC
Ratio Error on Primary/Secondary Current: Allows user to select whether the ratio error is
displayed on Primary Current ( 101:5) or
displayed on Secondary Current ( 100:4.99)
Set Date Time Change the time and date stored in the MRCT. This option is only
Available on MRCT with integrated display
Show Connection Diagrams: Allows user to turn off the functionality showing connection
Diagrams before each test. This is not recommended because
of safety concerns.
Knee Prediction Enabled/Disabled: Allows the user to enable and disable the knee point
prediction algorithms. If the user enters the nameplate