Faoi láthair, úsáideann na modhanna a úsáidtear go coitianta chun lochtanna a thomhas méid na frithsheasmhachta a bheith comhréireach le fad ancábla, use the bridge principle to measure the resistance between the end of the faulty cábla and the fault point, and compare it with the non-faulty phase, and then determine the distance to the fault point .
Modh Droichead Capacitance
Úsáid an droichead toilleas chun ciorcad oscailte agus dícheangal ancábla. When the cábla 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.
Modh tonn seasta.
De réir phrionsabal na líne tarchuir micreathonn, úsáidtear feiniméan athshondais tonn seasta na líne tarchuir chun an locht a thástáilcábla. Tá an modh seo oiriúnach chun lochtanna ísealfhriotaíochta agus ciorcad oscailte a thomhas.
Modh cuisle.
Úsáid foinse comhartha ardvoltais DC chun comharthaí bíge a tharchur go díreach chuig an gcroí lochtach. Úsáid an ionstraim chun an comhartha a fháil agus é a shuíomh go cruinn.
Combining the above method and technology application, 1. First determine the nature of the cábla fault, 2. Roughly locate, use the bridge method or the cábla 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 cábla tester to accurately locate, and the error will not exceed half a meter.
