Megger MVCT Bruksanvisning

Megger mätning MVCT

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MEGGER VOLTAGE AND CURRENT TRANSFORMER TEST

INSTRUMENT

MVCT USER MANUAL

May 8, 2020

Part#86027R5

 

 
Table of Contents 
0  MVCT............................................................................................................................................. 12 
0  Introduction ........................................................................................................................................... 12 
2  Terminology ........................................................................................................................................... 12 
2.1  Acronyms .................................................................................................................... 12 
0  MVCT Unpack and Preparation for Use........................................................................... 13 
1      Contents of MVCT kit ............................................................................................................................ 13 
2  Assembly and Installation ................................................................................................................ 15 
3  Communication Ports ........................................................................................................................ 15 
3.1  Ethernet Ports on MVCT ............................................................................................. 15 
3.2  Ethernet Ports on Display ........................................................................................... 16 
3.3  USB 2.0 Interface  on Display ...................................................................................... 16 
4  Supply Voltage ...................................................................................................................................... 16 
5  Operating System ................................................................................................................................. 17 
0  Basic Theory of Operation .................................................................................................... 17 
1  General ..................................................................................................................................................... 17 
2    CT Testing ................................................................................................................................................... 17 
2.1     Ratio Test ..................................................................................................................... 17 
2.2     Polarity Test ................................................................................................................. 18 
2.3     Excitation Test .............................................................................................................. 20 
2.4     Insulation Resistance Test ............................................................................................ 21 
2.5     Burden Test .................................................................................................................. 22 
2.6     Secondary Winding Resistance .................................................................................... 23 
0  Powering System ..................................................................................................................... 23 
1.   Initial Start Up ....................................................................................................................................... 23 
0     User Interface ............................................................................................................................ 24 
1  Integrated Display or Smart Touch View Interface ............................................................... 24 
2   Personal Computer Interface ......................................................................................................... 25 
3   Software Interface .............................................................................................................................. 29 
4 Testing Mode ................................................................................................................................................. 32 
4.1 CT Testing Mode – Menu Items ....................................................................................... 32 
4.2      VT Testing Mode – Menu Items .................................................................................. 64 
4.2.7     Self Test................................................................................................................................................ 72 
4.3  Relay Testing Mode ........................................................................................................................ 81 
0  Testing CT with MVCT ........................................................................................................... 82 
1  Test Plan Creation ............................................................................................................................... 82 
2  CT Saturation Test ............................................................................................................................... 86 
2.1  Method 1 – Concurrent ............................................................................................... 86 
2.2  Method 2 – Non Concurrent or Testing a Single Tap .................................................. 90 
3  Ratio Test ................................................................................................................................................ 94 
3.1  Method 1 – Concurrent ............................................................................................... 94 
3.2     Method 2 – Non Concurrent or Testing a Single Tap ................................................... 98 
4  CT Winding Resistance Test: ........................................................................................................ 103 
4.1  Method 1 – Concurrent ............................................................................................. 103 
4.2   Method 2 – Non Concurrent or Testing a Single Tap ................................................ 107 