The core component of the high voltage power cable is the cable body, but the cable body is very easy to destroy and it is not easy to solve after the failure occurs. At this time, the high power power cell body is mainly applied in a completely closed space. Moreover, the distance between the high voltage power cable and the cable body is relatively long, which brings great difficulties to the maintenance of the cable body. Failure to solve the failure in time will cause greater problems. The types of cable body faults are very diverse. The following is a detailed description of cable body faults.
(1) Mechanical damage to the cable body. The most important fault in cable body failure is the mechanical damage of cable. Mechanical damage means that the cable is affected by external forces during the laying of the cable or after the cable is laid. The cable is deformed or broken. This can lead to a sudden failure of the cable and can not normally transmit electricity to affect the operation of the grid.
(3) Cable quality does not pass. In cable manufacturing, the manufacturing does not strictly comply with the relevant standards, resulting in cracking of the main insulation layer of the wrapped cable, which reduces the insulation performance of the cable body and causes ground failure in the actual operation of the cable. Insulation breakdown will occur due to poor insulation performance, which will cause cable body failure.
High power cable uses cable connectors for long-distance power supply. This is a commonly used power supply method in Xinjiang, and intermediate connectors are almost always found in Xinjiang cables. However, cable connectors are very prone to failure. The cable connector failure mainly occurs in the part of the cable where the electrical stress is concentrated, that is, the cable insulation shield fracture, and the cable connector failure in the insulation shield fault performance is mainly electrical leakage and then high resistance failure. As well as the cable joint seal ring oil leakage, cable joint filling agent quality is not cleared, thus affecting the operation of the power grid.
1.3 Failure of the ground system of high power power cable
(1) high voltage power cable cable low resistance and ground failure. The low resistance fault of the high voltage resistance is mainly manifested in: the insulation between the high power power cell phase and the ground is damaged, which affects the high power power grid insulation resistance. continuous decrease, At this time, there is a low resistance failure of high voltage resistance.
(2) The resistance value between the open circuit fault, the high power power cable phase, and the high power power cell phase and the ground must be stabilized between a certain range according to the relevant standards. However, in the normal operation of high power power cable, there is often a situation where the cable terminal does not have voltage, or the load capacity of the cable terminal is not strong, so that there will be an open circuit failure of high power power power cable.