Megger MVCT - Table of Contents

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Table of Contents
1.0 MVCT............................................................................................................................................. 12
1.0 Introduction ........................................................................................................................................... 12
1.2 Terminology ........................................................................................................................................... 12
1.2.1 Acronyms .................................................................................................................... 12
2.0 MVCT Unpack and Preparation for Use........................................................................... 13
2.1 Contents of MVCT kit ............................................................................................................................ 13
2.2 Assembly and Installation ................................................................................................................ 15
2.3 Communication Ports ........................................................................................................................ 15
2.3.1 Ethernet Ports on MVCT ............................................................................................. 15
2.3.2 Ethernet Ports on Display ........................................................................................... 16
2.3.3 USB 2.0 Interface on Display ...................................................................................... 16
2.4 Supply Voltage ...................................................................................................................................... 16
2.5 Operating System ................................................................................................................................. 17
3.0 Basic Theory of Operation .................................................................................................... 17
3.1 General ..................................................................................................................................................... 17
3.2 CT Testing ................................................................................................................................................... 17
3.2.1 Ratio Test ..................................................................................................................... 17
3.2.2 Polarity Test ................................................................................................................. 18
3.2.3 Excitation Test .............................................................................................................. 20
3.2.4 Insulation Resistance Test ............................................................................................ 21
3.2.5 Burden Test .................................................................................................................. 22
3.2.6 Secondary Winding Resistance .................................................................................... 23
4.0 Powering System ..................................................................................................................... 23
4.1. Initial Start Up ....................................................................................................................................... 23
5.0 User Interface ............................................................................................................................ 24
5.1 Integrated Display or Smart Touch View Interface ............................................................... 24
5.2 Personal Computer Interface ......................................................................................................... 25
5.3 Software Interface .............................................................................................................................. 29
5.4 Testing Mode ................................................................................................................................................. 32
5.4.1 CT Testing Mode – Menu Items ....................................................................................... 32
5.4.2 VT Testing Mode – Menu Items .................................................................................. 64
5.4.2.7 Self Test................................................................................................................................................ 72
5.4.3 Relay Testing Mode ........................................................................................................................ 81
6.0 Testing CT with MVCT ........................................................................................................... 82
6.1 Test Plan Creation ............................................................................................................................... 82
6.2 CT Saturation Test ............................................................................................................................... 86
6.2.1 Method 1 – Concurrent ............................................................................................... 86
6.2.2 Method 2 – Non Concurrent or Testing a Single Tap .................................................. 90
6.3 Ratio Test ................................................................................................................................................ 94
6.3.1 Method 1 – Concurrent ............................................................................................... 94
6.3.2 Method 2 – Non Concurrent or Testing a Single Tap ................................................... 98
6.4 CT Winding Resistance Test: ........................................................................................................ 103
6.4.1 Method 1 – Concurrent ............................................................................................. 103
6.4.2 Method 2 – Non Concurrent or Testing a Single Tap ................................................ 107