1, Partial discharge detection
Partial discharge is one of the main forms of faults in high-voltage cables, which can cause local deformation, burning, and in severe cases, even appearance cracking, leading to accidents. Therefore, partial discharge detection is one of the common detection items for high-voltage cables. The detection methods include high-frequency current method, radio frequency method, and ultrasonic method.
2, Detection of dielectric loss tangent angle
The tangent of the dielectric loss angle is one of the indicators for measuring the dielectric loss performance of high-voltage cables, and it is also a key parameter for the safe and stable operation of the power system. By detecting the tangent of the dielectric loss angle, the aging and residual life of the cable can be determined, and aging cables can be maintained and replaced in a timely manner.
3, Cable insulation resistance detection
Cable insulation resistance is one of the indicators for determining the insulation status of cables and a parameter for measuring the degree of cable aging. The detection methods include DC resistance method, AC resistance method, and neutral point current method.
4, Cable capacitance detection
Cable capacitance is one of the inherent electrical parameters of high-voltage cables, which directly affects the electric field distribution and electrical performance of the cable. Detecting cable capacitance can determine whether the cable is damaged or aged.
The above are common testing items for high-voltage cables. Regular testing can timely detect cable faults and carry out maintenance to ensure the safe and stable operation of the power system.