Analysis and treatment of cable insulation breakdown

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Author：Shenghua Cable Click： Time：2019-12-25 00:00:00

Cable insulation breakdown is not the breakdown we commonly understand. Cable insulation breakdown refers to the original insulation performance of the cable's insulation layer being damaged by external forces (such as compression, lightning strikes, etc.), aging of insulation materials, etc., resulting in the loss of original insulation performance, and the occurrence of grounding and short circuit faults between the core wires of the cable during operation, between the core wires of the cable, and between the core wires of the cable's outer protective steel strip and ground. Commonly known as "breakdown".

There are generally several reasons for cable breakdown:

One is mechanical damage, such as heavy objects compressing the cable, external force damage, etc. The second is damage caused by non-standard construction, such as improper connection of cable heads, unqualified materials used, etc. The third is damage caused by insulation moisture, such as improper operation during construction, allowing some water vapor to enter the cable, or careless operation, causing external damage, allowing water vapor to enter the inside of the cable, causing breakdown. Another issue is insulation aging. During long-term operation, insulation materials become fragile and easily broken, making them prone to breakdown.

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Measures to prevent cable insulation breakdown:

(1) Prevent mechanical damage. Firstly, it is necessary to strengthen inspections and promptly prevent excavation, excavation of overhead transmission lines, and excavation of soil near cable lines.

(2) Improve the construction quality of cable heads. Strictly carry out drying treatment. Due to the uneven distribution of electric fields near the terminal head, the electric field strength at the lead sleeve edge is the highest, so it is necessary to strengthen the insulation at that location.

(3) Strictly prevent insulation from getting damp., Strengthen the maintenance of the electrical outer protective layer, and apply asphalt on the outer protective layer every 2-3 years.

(4) Be careful when handling cables, avoid squeezing them, and avoid excessive bending during laying to prevent damage to the internal insulation.

(5) Purchase cables with qualified and excellent quality, such as our Shenghua Cable, which has passed the national weapons and equipment certification with excellent quality. For a long time, Shenghua Cable has always adhered to the principle of survival through quality, safety as the guarantee, reputation through service, efficiency through management, and development through development. Through strict control at every stage from raw material entry to finished product delivery, Shenghua Cable ensures product quality and meets customer requirements.

Shenghua Cable Group mainly produces high and low voltage cross-linked cables, power cables (YJV, YJV22, YJLV) cloth wires (BV, BVR, RVV, RVS) aluminum alloy cables (YJLHV), overhead cables, flame-retardant and fire-resistant cables, rubber sheathed cables, control cables (KVV), special cables and other products. Customers with needs are welcome to inquire.

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Analysis and treatment of cable insulation breakdown

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