Iec 60694 Free Download Pdf: Learn About the Normative References, Definitions, and Ratings for High

The modern High Voltage SF6 circuit breakers have two parallel contact sets. The main contacts are low resistance contacts, which are silver plated, whereas arcing contacts are of tungsten-copper which helps in initiating arc quenching and current interruption. Measurement of the static contact resistance with the breaker in closed position gives the resistance of main contacts only because the arcing contacts are bypassed. Healthiness of main contacts only gets checked during this test. The minimum dc test current should be used according to manufactures specification; however, the IEC and ANSI recommended levels are: 50 A IEC 60694 and 100 A ANSI.

Iec 60694 Free Download Pdf

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