Insulators – Physical Elements?

1. What is an insulator?

 

A device capable of withstanding voltage and mechanical stress installed between conductors of different potentials or between conductors and grounded components. There are many types of insulators and different shapes. Although the structure and shape of different types of insulators are quite different, they are all composed of two parts: insulating parts and connecting hardware.

An insulator is a special insulation control that can play an important role in overhead transmission lines. In the early years, insulators were mostly used for utility poles, and gradually developed in the high-voltage wire connection tower with a lot of disc-shaped insulators hanging at one end. It is to increase the creepage distance, usually made of glass or ceramics, called insulators. The insulator should not fail due to various electromechanical stresses caused by changes in the environment and electrical load conditions, otherwise the insulator will not play a significant role and will damage the service and operating life of the entire line.

 

2. Functions and requirements of insulators?

 

The main function of insulators is to achieve electrical insulation and mechanical fixation, for which various electrical and mechanical performance requirements are specified. If there is no breakdown or flashover along the surface under the action of the specified operating voltage, lightning overvoltage and internal overvoltage; under the action of the specified long-term and short-term mechanical loads, no damage or damage will occur; under the specified machine , electrical load and long-term operation under various environmental conditions, there will be no obvious deterioration; the hardware of the insulator will not produce obvious corona discharge phenomenon under the operating voltage, so as not to interfere with the reception of radio or television. Because insulators are widely used devices, their connecting hardware also requires interchangeability. In addition, the technical standards of insulators also require various electrical, mechanical, physical and environmental conditions change tests on insulators to verify their performance and quality according to different models and conditions of use.

 

3.Maintenance and management of insulators?

 

In wet weather conditions, dirty insulators are prone to flashover discharge, so they must be cleaned to restore the original insulation level. One year in general area

Clean once, and clean dirty areas twice a year (once before fog season).

3.1. Power outage cleaning

Power outage cleaning is to wipe the line with a rag after the line is out of power. If it is not clean, it can be wiped with a damp cloth or a detergent. If it is still not clean, the insulator should be replaced or a synthetic insulator.

3.2. Uninterrupted cleaning

Generally, the insulator is wiped on the running line by using an insulating rod equipped with a brush or tied with cotton yarn. The electrical performance and effective length of the insulating rod used, and the distance between the person and the live part should comply with the regulations of the corresponding voltage level, and there must be a special person to supervise the operation.

3.3. Rinse with charged water

There are two methods of large water flushing and small water flushing. The flushing water, the effective length of the operating rod, and the distance between the person and the live part must comply with the requirements of the industry regulations.

 

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Post time: Sep-21-2022


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