FIELD: switchgear protection against short circuits accompanied by arcing. SUBSTANCE: device has measuring element that functions to check signal level proportional to light flux generated by electric arc caused by short circuit; measuring element has frequency-dependent component in its input section which forms, together with operating photosensor and control cable, low-frequency or band filter whose transmission gain depends on photosensor condition. EFFECT: improved response to short circuits enabling reliable elimination of various electromagnetic interferences. 1 dwg
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|---|---|---|---|
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