Abstract
Currently the detection of an internal arc inside a switchgear is done by means of an optical arc flash sensor. This triggers an external power supplied electronic device with charged capacitor to actuate the active primary arc mitigation device. In several cases the arc sensing is linked with the current threshold value in addition. A new and innovative method to detect, trigger and power the arc mitigation device by means of solar-cells which are energized by the arc flash only, has been worked out. There is no need to have the detection of both current and light together because the arc flash itself is used to generate enough power to tigger the active arc mitigation device. The new method using solar-cell triggers and powers the mitigation device even within less than 4…5ms. This paper presents an innovative way how to detect the internal arc in low– and medium– voltage and to trigger and actuate the active arc mitigation device.
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