Possible Winding Voltages Setup Issue With GE Multilin 745 Transformer Management Relay

GE Multilin 745 Transformer Management Relay

This was a nice surprise for me.  Older versions of the SR-745 have a maximum voltage of 200kV.  If you use newer software to set the relay, it indicates a maximum voltage of 2000.0 kV.  If a voltage setting higher than the maximum is uploaded, the relay automatically divides all voltage and MVA values by a factor of 10.  There is NO warning when this happens.  This fix does work but will be a shock when someone else looks at the settings afterward.  A good fix is to change the voltages to line to ground values.

About the Author Chris Werstiuk

Chris is an Electrical Engineering Technologist, a Journeyman Power System Electrician, and a Professional Engineer. He is also the Author of The Relay Testing Handbook series and founder of Valence Electrical Training Services. You can find out more about Chris here.

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