FIELD: electricity, electrode network. SUBSTANCE: device has a measuring element made in the form of integrated timer 12 operating in a self-oscillator mode with RC-circuit connected between the output of low-pass filter 27 and the input of integrated timer 12, an actuating device made in the form of audio-frequency transformer 21, rectifier 22 and relay 23 shunted by capacitor 24. EFFECT: enhanced reliability. 2 dwg
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