FIELD: electric power transmission lines for mains with insulated neutral wire. SUBSTANCE: transducer, which is located in point for checking ice load on wire, converts signal from output of ice load detectors into direct current voltage. Output of transducer is connected to comparator which is triggered when ice load reaches given level. In addition device has controlled low-frequency oscillator, which output voltage is added to value of transducer, when comparator is triggered and electronic key is open. This results in duplication of continuous direct voltage signal with low-frequency signal, when dangerous ice load is detected. This also results in increased reliability of monitoring, when resistance drops and phase-earth information transmission channel is partly shunted. EFFECT: increased reliability of monitoring of dangerous ice load. 1 dwg
