Article | REF: D4705 V1

Medium-voltage switching techniques

Author: Serge THÉOLEYRE

Publication date: November 10, 1999

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2. Switching off load currents

You'd think that the main difficulty would be switching off very high currents. In fact, certain load currents make disconnection difficult due to arc/network interactions. In this section, we'll look in turn at the various normal and fault situations encountered on networks.

2.1 Switching off resistive currents

In normal MV operation, a circuit is cut:

  • on a load current of a few amperes to a few hundred amperes, low compared with the short-circuit current (10 to 50 kA);

  • with a power factor greater than or equal to 0.8; the phase shift between circuit voltage and current is small, and the voltage minimum occurs around the current minimum (highly resistive circuit).

  • ...
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