氧化锌避雷器厂家在输电线路上的应用

There are two aspects to the application of zinc oxide arresters on transmission lines:

One is used for lightning protection of transmission lines;

The second is to limit the over-voltage operation along the transmission line of 330kV and above (especially the circuit where the circuit breaker cancels the closing resistance).

Different applications, the determination of zinc oxide arrester model, zinc oxide arrester parameters and installation location are also different.

Compared with the lightning protection of traditional transmission lines, zinc oxide arresters are connected in parallel at both ends of the line insulators (strings) to protect the sections with frequent lightning activities and difficulty in reducing the grounding resistance of the tower. At the same time, with the rapid development of composite jacket arresters and With the continuous improvement of the performance of resistors, the application of zinc oxide arresters in power systems is becoming more and more extensive, and the research work of lightning arresters for line lightning protection is gradually being carried out.

Line arresters are divided into series gap type (air gap or fixed gap) and gapless type. They are connected in parallel at both ends of the insulator (string). The main difference is that the zinc oxide arrester body of the previous type basically does not bear the operating voltage of the system, and the failure of the body does not affect the normal operation of the line. The latter type of arrester bears the effect of working voltage for a long time.

Discussion on related issues of passing zinc oxide arrester, cold-shrinkable cable terminal, and lightning current

When lightning strikes the top of the tower, part of the lightning current travels along the lightning protection line to both sides of the lightning strike; part of it enters the ground through the tower; and part of it flows through the zinc oxide arrester. The proportion of each part of the current to the total current depends on the geometric arrangement of the lightning conductors and wires, the height of the tower and the grounding resistance. Taking a line arrester with a rated voltage of 108kV installed on a 110kV single pole single lightning protection line cement tower as an example, the electromagnetic transient calculation program (EMTP) calculation shows that under extremely harsh conditions, the lightning current amplitude is 300kA, and the tower The grounding resistance is 60SZ. When lightning strikes the tower directly, the current flowing through the zinc oxide arrester does not exceed 20kkA.

In the field test, in order to summarize the methods to prevent the lightning damage of transmission lines in coastal areas in winter, the technicians have carried out manual lightning triggering and measured the lightning current flowing through the line arresters.

Yichang Hengyuan Technology Co., Ltd. is a professional manufacturer of European-style cable connectors, plug connectors, cable branch boxes, American elbows, high-voltage vacuum circuit breakers, high-voltage load switches, lightning arresters, zinc oxide arresters, tank arresters, overvoltage protectors, Counters, monitors, heat-shrinkable cable accessories, cold-shrinkable cable accessories, T-heads, wall bushings, European cable accessories, American cable joints, transformer neutral point protection devices, fuses, isolating switches, PT cable heads, elbows Manufacturers of type cable joints, 10kV outdoor terminals, switch cabinets, cable intermediate joints, cable accessories and other products