go to the Service product page Anonymous asked on Jan 27th, 2015 in Service

While checking the main contact resistance we found that a few of the values across one of the breaking chambers are higher than expected. What is your recommendations?

Herb Rogers, Head of High-voltage Service

ABB's answer

We normally allow up to 2000 Microohms in a filter application. If the contact resistance has a high value, it´s due to powder contamination and sometimes you can use a higher current level to measure correct resistance levels. Another option is to operate the breaker 30 times without any load on the breaker, that cleans up the contact path.

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Area expert

  • Herb Rogers

    Herb Rogers

    Head of High-voltage Service

    High Voltage Products

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