Introduction to the Causes of High-Voltage Cable Failure

1) Causes of Cable Body Manufacturing

Generally, the problems that are easy to occur in the cable production process are insulation eccentricity, uneven thickness of the insulation shield, impurities in the insulation, protrusions in the inner and outer shields, uneven cross-linking degree, dampness of the cable, poor sealing of the metal sheath of the cable, etc. 

It is serious that failure may occur in the complete test or shortly after the operation, and most of them are in the form of defects in the cable system, which poses a serious hidden danger to the long-term safe operation of the cable.

2) Reasons for Cable Connector Manufacturing

High-voltage cable joints used in the past, such as wrapping, molding, molding, etc., require a lot of work on-site.

And because of the limitations of the field conditions and the manufacturing process, there will inevitably be air gaps between the layers of the insulation. 

And impurities, so problems are easy to occur. The types commonly used in China today are assembled and prefabricated.

Cable connectors are divided into cable terminations and cable intermediate connectors. 

Regardless of the connector type, cable connector failures generally appear at the cable insulation shield breaks. 

This is where the electrical stress is concentrated. The cause of the cable connector failure is stress due to manufacturing reasons. 

Cone body manufacturing defects, insulation filler problems, seal oil leakage, and other reasons.

3) Cable Grounding System

The cable grounding system includes a cable grounding box, a cable grounding protection box (with a sheath protector), a cable cross-connect box, and a sheath protector. 

The problem that is generally prone to occur is mainly because the tank is not well sealed and causes multiple points of grounding, causing the metal sheath to induce an excessive current. 

In addition, the parameters of the sheath protector are unreasonable or the quality is not good. 

The instability of the zinc oxide crystal is also likely to cause damage to the sheath protector.

If you have any interest in our cable products, you can email us at info@zmscable.com or contact us via the "Contact Us" section of the website.