Lightning accounts for a large proportion of tripping accidents caused by modern power systems. The lightning current generated by the power system can reach tens or even thousands of amperes, causing powerful electromagnetic, mechanical and thermal effects. From the perspective of power engineering, lightning discharge will cause high lightning overvoltage in the power system, which will cause insulation faults and power outages in the power system. With the development of the power system, tripping accidents caused by lightning strikes on transmission lines are also increasing. According to power grid fault classification statistics, in areas with relatively high tripping rates in my country, tripping times caused by lightning strikes account for 40% to 70% of the total number of trips caused by high-voltage shallow road operations. In areas with strong lightning activity, high soil resistivity, and complex terrain, the tripping rate caused by lightning strikes on transmission lines corresponds to The use of high-voltage arresters to improve the lightning resistance level of AC transmission lines was analyzed and studied. The lightning protection effect of high-voltage arresters during lightning counterattack and shielding and the impact of factors such as grounding resistance and AC transmission line distance on the lightning resistance level were analyzed. Finally, the lightning protection range of high-voltage arresters was analyzed and discussed.
European cable connector
In recent years, with the continuous deterioration of environmental conditions, tripping accidents of high-voltage transmission lines caused by lightning strikes have also increased. Especially in areas with frequent thunderstorms, complex terrain, and high soil resistivity, lightning will increase the failure rate of transmission lines and even cause local power supply interruptions, bringing huge safety risks to production. In this regard, it is necessary to effectively improve the protection of high-voltage lines. This article analyzes the reasons for power line jumps caused by snow and lightning, enumerates the main measures for three common high-voltage line lightning strikes, and analyzes the types of high-voltage arresters installed on high-voltage lines, highlighting its effect in reducing line lightning tripping rates and improving power supply safety and reliability.
American cable connector
Fully insulated composite jacketed metal oxide arrester, including an arrester body connected with leads. The upper end of the high-voltage arrester body is provided with a tapered sleeve for the leads to pass through, and the lower end is equipped with a mounting flange. The leads are made of high-voltage insulated cable wires, and one end is equipped with a terminal block. , the other end is sealed in a tapered sleeve and connected to the upper end of the arrester body; the tapped grounding stud located at the lower part of the arrester body passes through the arrester jacket and is packaged on the 10KV high-voltage arrester body, so that the external parts and the high-voltage arrester body form a fully insulated whole. High-voltage arresters not only reduce the number of components, improve manufacturability, and make high-voltage arresters more compact, but also greatly reduce the air distance between adjacent arresters and increase the creepage distance of the arrester. Through the flexible connection structure, the arrester can be extended to high-altitude and heavily polluted areas. It is especially suitable for switch cabinets with limited space.
Cold shrink cable head
Lightning arrester manufacturer
