go to the Instrument transformers product page Anonymous asked on Jan 24th, 2015 in Instrument transformers

What is the risk of a short-circuited secondary in voltage transformers?

Nicholas S Powers, Global Product Marketing Manager Instrument Transformers

ABB's answer

Each unused secondary winding must be grounded at one point. Never short-circuit a secondary winding as it can create very high current between the terminals which may prove dangerous for both- the personnel and the transformers. Grounding at more than one point in a connected instrumentation circuit results in circulating currents on the neutral wire. This causes a voltage drop and increases errors in measuring, or even a short-circuit in case both polarity wire and neutral wire are grounded at different points.


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  • Worawut Sae-Kok

    Worawut Sae-Kok

    Global Product Marketing Manager Disconnectors

    High Voltage Products

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