Pada masa ini, kaedah yang biasa digunakan untuk mengukur kesalahan terutamanya menggunakan ukuran rintangan agar sebanding dengan panjangkabel, 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 .
Kaedah Jambatan Kapasiti
Gunakan jambatan kapasitansi untuk mengukur litar terbuka dan pemutusan sambungankabel. 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.
Kaedah gelombang berdiri.
Menurut prinsip saluran transmisi gelombang mikro, fenomena resonans gelombang tegak saluran penghantaran digunakan untuk menguji kerosakankabel. Kaedah ini sesuai untuk mengukur rintangan rendah dan kerosakan litar terbuka.
Kaedah nadi.
Gunakan sumber isyarat voltan tinggi DC untuk menghantar isyarat nadi secara langsung ke teras yang rosak. Gunakan instrumen untuk menerima isyarat dan meletakkannya dengan tepat.
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.
