How to measure the performance of cable accessories

The connection methods of cable accessories are generally divided into terminal connection and central connection. Terminal connection is divided into indoor terminal and outdoor terminal. Generally, outdoor terminal refers to outdoor cable joint, and indoor terminal refers to indoor connection cable and electrical equipment joint; center The connection is divided into two types: straight-through and insulated.

The basic requirements of cold-shrinkable cable accessories: effective control of the electric field strength at the insulation shielding fracture, reliable sealing to the external environment and complete insulation protection, satisfactory mechanical strength, and excellent conductor connection. How to measure the function of a good cable accessory?

There are many aspects to measure the function of cable accessories. The most important thing is to measure whether a cable accessory has reached a long-term and stable operating life from the aspects ofelectrical function; andphysical function;. The most important element to measure is: stability Reliable long-term operation life, some common key elements of cable accessories after long-term operation have important influence on the function of cable accessories.

In terms of electrical functions: the performance of resisting partial discharge, the role of electrical stress control measures, the structure of the shielding layer of the cable center head, the weather resistance function of the cable terminal. To measure the effect of electrical stress control measures for cable accessories, whether it can effectively reduce the electric field strength of the internal and external interfaces, whether it can help to improve other electrical functions, and whether it can be proved by long-term operation time.

Physical function: waterproof sealing function, mechanical maintenance function of center head and reliability of ground connection, operation instructions and installation process of heat shrinkable cable accessories.

A good quality cable accessory should have the following characteristics:

1. It has certain mechanical strength, vibration resistance and corrosion resistance.

2. After long-term operation, the contact resistance is not greater than 1.2 times the resistance of the same length of the cable core body.

3. The wire core is well connected, the connection resistance is small and stable, and it can experience the impact of fault current.

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