Analysis and treatment of cable insulation breakdown in Zhengzhou yjv22 Cable Co., Ltd

  　　  Analysis and treatment of cable insulation breakdown in Zhengzhou first cable Co
, Ltd
Cable insulation breakdown is not a breakdown in our conventional understanding
Cable insulation breakdown refers to the destruction of the original insulation performance of the cable insulation layer due to external force damage, (extrusion, lightning, etc
), aging of insulation materials, etc
, and the loss of the original insulation performance, resulting in grounding and short-circuit faults caused by the discharge between the core wire and the core wire of the cable, between the core wire and the outer protective steel belt of the cable and to the ground
Commonly known as & ldquo; Breakdown & rdquo Cable breakdown is generally caused by the following reasons: First, mechanical damage, such as heavy objects pressing cables, external force damage, etc
Second, damages caused by non-standard construction, such as improper connection of cable heads, unqualified materials, etc
Third, the insulation is affected by moisture, such as unreasonable operation during construction, allowing part of the water vapor to enter the cable, or careless operation, causing external damage, making the water vapor enter the inside of the cable and causing breakdown
There is also the problem of insulation aging
During long-term operation, the insulating material becomes fragile and easy to break, which is prone to breakdown Measures to prevent cable insulation breakdown: (1) prevent mechanical damage
The first is to strengthen the inspection and timely prevent the excavation near the cable line and the soil taking of overhead transmission line and electric joint line (2) improve the construction quality of cable head
Strictly carry out drying treatment
As the electric field distribution near the terminal head is very uneven, and the electric field intensity at the lead sleeve edge is the largest, the insulation at this place should be strengthened (3) insulation shall be protected from moisture
, Strengthen the maintenance of the electric outer protective layer, and paint asphalt on the outer protective layer every 2 ~ 3 years (4) the cable shall be handled carefully
When moving the cable, the cable shall not be squeezed
The cable shall not be bent excessively during laying to prevent damage to the internal insulation (5) purchase qualified and excellent cables