Abstract
The market application value of power cables has gradually emerged with the development of various industries. Cable laying is a basic project in the construction of power grid and a key part of power engineering construction, and a key content of power engineering construction, which is related to the safe and reliable operation of the entire power grid. With the laying process of power cable, the metal sheath is subjected to structural damage such as extrusion deformation. This paper takes a 110kV cable line as an example, The case of cable damage was introduced in detail, and targeted measures were proposed based on the defects caused by the damage. At the same time, the structural analysis of the cable damage is carried out, and the structural analysis and simulation are performed, and the partial discharge test is performed on the damaged portion of the insulation to obtain the stress received when the cable is recessed, and the partial discharge signal detected by the damage of the insulating shielding layer is collected. Provide reference for staff related to power cables.
Highlights
As an important part of power transmission and distribution in the power system, power cables are usually laid in the soil or in the space of buildings, ditches or tunnels, which are not affected by the surrounding environment or climate conditions, and can carry out stable performance transmission with high security
The heating phenomenon generated by the large current flowing through the magnetic core can be avoided, reducing the risk of cable insulation damage, and at the same time, the metal protection of the cable The sheath plays a shielding role, and the metal sheath has a profound impact on the safety and reliability of the power supply of the cable [4,5]
Once the metal sheath is damaged by external force, such as depression and other structural damage, the local overheating of the cable will occur, and the power supply reliability of the whole cable will be seriously affected
Summary
As an important part of power transmission and distribution in the power system, power cables are usually laid in the soil or in the space of buildings, ditches or tunnels, which are not affected by the surrounding environment or climate conditions, and can carry out stable performance transmission with high security. The metal sheath plays an important role in the power cable. In the process of power cable transmission, once the line has a short-circuit fault, the short-circuit current can flow through the metal sheath as its flow path. In this way, the heating phenomenon generated by the large current flowing through the magnetic core can be avoided, reducing the risk of cable insulation damage, and at the same time, the metal protection of the cable The sheath plays a shielding role, and the metal sheath has a profound impact on the safety and reliability of the power supply of the cable [4,5]. This paper analyses the cause of external force damage of 110kV cable line in a certain area, carries out mechanical
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