Trenutno običajno uporabljene metode merjenja napak uporabljajo predvsem velikost upora, ki je sorazmerna z dolžinokabel, use the bridge principle to measure the resistance between the end of the faulty kabel and the fault point, and compare it with the non-faulty phase, and then determine the distance to the fault point .
Metoda kapacitivnega mostu
Uporabite kapacitivni most za merjenje odprtega tokokroga in odklopakabel. When the kabel is open circuit, because the DC bridge measurement arm fails to form a DC path, the resistance bridge method will not be able to measure the distance to the fault. Only the capacitance bridge method can be used. And use the high-voltage bridge method to measure the leakage and high-resistance breakdown.
Metoda stoječih valov.
V skladu z načelom mikrovalovnega daljnovoda se za preskus okvarjenega uporablja resonančni pojav stoječega vala daljnovodakabel. Ta metoda je primerna za merjenje napak nizkega upora in odprtega tokokroga.
Pulzna metoda.
Uporabite enosmerni vir visokonapetostnega signala za neposreden prenos impulznih signalov na okvarjeno jedro. Z instrumentom sprejmite signal in ga natančno postavite.
Combining the above method and technology application, 1. First determine the nature of the kabel fault, 2. Roughly locate, use the bridge method or the kabel fault locator to determine the distance of the fault point in meters. 3. Use DC high voltage signal source to directly transmit pulse signals to the faulty core. 4. Use underground kabel tester to accurately locate, and the error will not exceed half a meter.
