Common Causes Of Metal Waterproof Cable Connector Failure

Nylon Cable Gland is an indispensable accessory for laying cables. At present, its types, specifications and forms are very rich, but this also leads to uneven quality on the market, and the technical level of the installers is different. When the purchased joints are of poor quality and not installed properly, failures often occur during use. Let's analyze the common causes of failures of metal waterproof cable joints.

Different operating modes and conditions of metal waterproof cable joints lead to different causes of failures.

At present, many high-voltage cables use cross-linked polyethylene insulated cables, especially in various types of power transmission and distribution lines with power frequency AC voltage of 500KV and below.

Because of the different media before it and the oil-paper cable, the causes of failure after using the metal waterproof cable joint are also different. After the oil-paper cable is installed, the main reason is that the insulation part is damaged.

The reason for the failure of the cross-linked polyethylene insulated cable after the metal waterproof cable joint is installed is that there is a problem with the conductor connection. When its operating temperature exceeds the rated temperature, it is easy to heat up, and it is easy to have problems such as short circuit and fire.

In addition, excessive contact resistance can also cause metal waterproof cable joint failure. In the circuit, resistance is the resistance of the material to the current. The material with low resistance is called conductor, and the material with high resistance is called insulator.

Once the temperature of the joint connection rises too quickly and the heat cannot be dissipated, the oxide film of the metal waterproof cable joint will thicken, which will further increase the contact resistance and make the temperature rise more serious. Such a vicious cycle for a long time will accelerate the speed of insulation layer damage, and the failure of the insulation layer and fire may occur.