AVTMMTO3XX Rev 3 Sept 2013
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Table of Contents
1 Getting to know the MTO .................................................................................................................................. 1
Product Overview 300/330 ................................................................................................................................ 1
Top Panel Controls .............................................................................................................................................. 2
2 Safety ...................................................................................................................................................................... 7
Safety is the responsibility of the user ............................................................................................................... 7
General Safety Precautions ................................................................................................................................. 8
Input Power Precautions ..................................................................................................................................... 9
PC Interface Precautions .................................................................................................................................. 10
3 Preparing for a Test ........................................................................................................................................... 11
Site Preparation .................................................................................................................................................. 11
Making Circuit Connections ............................................................................................................................ 11
4 Operating the MTO300/330 ........................................................................................................................... 13
Description of Test Sequence ......................................................................................................................... 13
5 Transformer Testing ......................................................................................................................................... 19
Winding Resistance Testing ............................................................................................................................. 19
Testing a Single-Phase Transformer ............................................................................................................... 20
Testing Delta Configured Windings ............................................................................................................... 35
Demagnetizing a Transformer ......................................................................................................................... 37
6 MTO330/300 Series PowerDB Lite ............................................................................................................... 43
Introduction ....................................................................................................................................................... 43
Software Installation ......................................................................................................................................... 44
Using PowerDB Lite ......................................................................................................................................... 47
Using PowerDB OnBoard (MTO330 only) .................................................................................................. 53
7 Service ................................................................................................................................................................. 55
Maintenance ....................................................................................................................................................... 55
Fuse Replacement ............................................................................................................................................. 55
Calibration .......................................................................................................................................................... 56
Repairs ................................................................................................................................................................. 57
Error Codes ........................................................................................................................................................ 58
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