FIELD: physics.
SUBSTANCE: in the device, a capacitor is in parallel to a second circuit consisting of series-connected second resistor, optocouple input, electronic switch output, where auxiliary control pulses are transmitted to the input of the electronic switch, said pulses being synchronised with an intrinsically safe ac voltage source.
EFFECT: simplification and ensuring complete failure safety, which prevents output of a signal falsely indicating voltage asymmetry in the control or signalling line.
5 cl, 4 dwg
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