Intelligent insulation line lightning protection on-line monitoring device and method

Abstract

The invention discloses an intelligent insulation line lightning protection on-line monitoring device and method. The intelligent insulation line lightning protection on-line monitoring device comprises a CPU module, the input end of the CPU module is connected with a sampling module, an environment temperature detection module and a power supply module, the sampling module is connected with a current transformer and a voltage transformer of a lightning arrester, and the environment temperature detection module is connected with a temperature sensor of the lightning arrester; the CPU module isfurther connected with a communication module and is in communication with the communication module, and the communication module is in communication with a system main station; the wire of a power distribution line is supported on a cross arm through an insulator string; the lightning arrester comprises a support clamp, a wiring spherical electrode, a grounding spherical electrode and an adjustable fixed support; and the support clamp is clamped to bear the wiring spherical electrode, the wiring spherical electrode is conducted with a conducting wire through the support clamp, and the grounding spherical electrode is supported on the cross arm through the adjustable fixed support and is ground connected. According to the device, the insulators are prevented from being attacked by lightning, data remote transmission is carried out on the lightning arrester leakage current and resistive current component and action times, and the working efficiency is high.

Description

technical field [0001] The invention belongs to the technical field of electric power safety, and in particular relates to an intelligent on-line lightning protection monitoring device and method for insulated lines. Background technique [0002] With the development of the national economy, the requirements for power supply reliability are getting higher and higher. In order to reduce tripping accidents caused by line overvoltage, many transmission lines adopt the method of replacing insulators to improve the line insulation level, in order to achieve the purpose of reducing the line tripping rate. After replacing the insulator, when encountering operation overvoltage or lightning overvoltage, the anti-overvoltage product (lightning arrester) installed on the line cannot completely and effectively release the operation or lightning current, which will cause the voltage on the line to rise and endanger the power supply on the line. Equipment safety, leading to serious equip...

AI Technical Summary

Problems solved by technology

After replacing the insulator, when encountering operation overvoltage or lightning overvoltage, the anti-overvoltage product (lightning arrester) installed on the line cannot completely and effectively release the operation or lightning current, which will cause the voltage on the line to rise and endanger the power supply on the line. Equipment safety, leading to serious equipment safety accidents

[0003] The insulation level of distribution lines is usually relatively low. Not only direct lightning strikes can cause damage, but also overvoltage generated by induced lightning can cause lightning accidents. At the same time, the lightning protection measures that can be taken for distribution lines are very limited, and generally it is not possible to use lightning protection lines , coupling ground wire and other methods, just install lightning arresters for protection

However, the arrester is only suitable for the protection of the incoming and outgoing lines of the distribution line and the distribution equipment, and cannot be installed in large quantities on the distribution network. If the arrester is installed on the entire distribution line, due to the large number, it will inevitably lead to high cost, large investment, and difficult operation and maintenance. difficult, and the arrester itself will form a new fault point when it is damaged, affecting the reliable operation of the distribution network, so the lightning protection problem of the distribution network has always been the main problem affecting the safe operation of the distribution network

Because the distribution lines have to pass through mountains, rivers, hills and other areas, the probability of being struck by lightning is very high. The insulation level of the porcelain insulators used on the lines will decrease after long-term operation, and the strong lightning current and power frequency current will blow up the insulators. , and even cause disconnection accidents

[0004] In order to prevent line insulators from being damaged during lightning strikes, it is necessary to protect the insulators. The best way is that when lightning strike overvoltage occurs, the lightning strike current and its subsequent power frequency continuous flow will not flow through the surface of the insulator, because if the lightning current or power frequency When the freewheeling current flows through the surface of the insulator, it will more or less damage the insulator, and because it is an insulating structure at the interface between solid and gas, it is affected by the contamination of the insulator surface and the influence of electric field distortion, which is not conducive to the extinguishment of the arc, and the lightning The arc building rate is high, and in severe cases, the insulator will be completely destroyed

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