FIELD: electrical engineering.
SUBSTANCE: current Ie flowing through tower to ground and voltage Ue at tower relative to ground are measured simultaneously. Symptoms of faults of two types are revealed at the tower and signal about fault is generated: at Ie>0 and Ue≤Uph signal about single-phase earthing, at Ie=0 and Ue.stand.<Ue≤Uph signal about single-phase tower frame ground connection and earthing circuit fault, where Ue.stand. is normalised voltage at tower relative to ground; Uph is circuit phase voltage. Particular tower fault is locally recorded and be remote means at dispatcher control station. Note here that fault signal is converted into encoded signal that comprises fault type sign and tower registration number. Said signal is transmitted via communication or radio line. Signal is decoded and fault is registered. Measured current and voltage are also used for calculation of actual tower earthing resistance. In case actual earthing resistance exceeds normalised value signal is generated indicating said fact, tower earthing circuit fault is registered locally and by remote means.
EFFECT: higher validity of pinpointing faulty tower with single-phase short circuits and control over actual tower earthing resistance.
1 dwg
