What issues should consumers pay attention to when purchasing surge arrester manufacturers
1. The overall dimensions of the arrester
The insulation strength of the porcelain sleeve is determined according to the indoor and outdoor dual-use conditions in the manufacture of lightning arresters, and the external dimensions are related to the material of the valve disc. When it is used in overhead lines or outdoor power distribution equipment, due to its large phase spacing, the shape and size of the arrester will not bring adverse effects. Because of the small size of the indoor handcart switchgear, the large size of the arrester will bring adverse effects.The unit flow capacity of the SiC valve of the silicon carbide arrester is only 1/4 of that of the ZnO valve.在相同通流能力（5kA）条件下，The diameter of the SiC valve plate is larger, and the outer diameter of the arrester is also larger; under the same rated voltage and residual voltage conditions, the height of the silicon carbide arrester is larger than that of the zinc oxide arrester.Especially the 35kV class is more significant.For example, the 112 scheme of JYN1-35 type handcart cabinet, originally used FYZ1-35 type no gap zinc oxide arrester, the height is only 650mm, installed on the simple handcart in the rear compartment of the cabinet, with an isolation plug on the upper part, because this product has been discontinued The engineering design insisted on switching to FZ3-35 type silicon carbide arrester, which is 1500mm high and the compartment height is not enough. The busbar compartment and the compartment partition plate have to be cancelled, and the arrester is directly connected to the main busbar, so that the test or replacement of the arrester must be completed. It is difficult to operate and maintain when the main busbar of the section is powered off, and the outer diameter of the arrester is large, and the air gap between the phases is not enough. The additional insulation partition between the phases has the hidden danger of aging and damp insulation. The outer diameter and height of the zinc oxide arrester are relatively small, and the 35kV class can also be made into a suspension type, such as the Y5CZz-42/110L series gap zinc oxide arrester, which has a height of only 640mm. The miniaturized arrester is more conducive to the installation and use in the handcart cabinet.
2. The performance and price ratio of arrester manufacturers
The valve plate of the gapless zinc oxide arrester bears the grid voltage for a long time during operation, and the working conditions are harsh. The valve plate must be strictly tested and selected during product manufacturing. The qualified rate is low and the price is high; because it has the ability to withstand transient overvoltage Poor’s fatal weakness is not suitable for popularization in my country's 3~35kV power grid. The series gap zinc oxide arrester has a gap, which greatly improves the long-term working conditions of the valve plate. The valve plate testing and screening requirements during product manufacturing are relatively low, the pass rate is high, the cost is low, and the price is cheaper. The series gap zinc oxide arrester is more expensive than no gap. Zinc oxide lightning arresters are generally cheap, sometimes cheaper than silicon carbide arresters (such as 3-10kV FZ type). At the same time, it has the effect of promoting strengths and avoiding weaknesses of other lightning protection devices. It is indeed the most advanced lightning protection appliance in the contemporary era, with high performance and price ratio. , Is the popularization and promotion product of lightning arrester replacement.
3. The service life of arrester manufacturers
The service life of the arrester is related to many factors. In addition to manufacturing quality, seal failure, moisture and other external factors, the aging speed of the arrester valve is the key factor affecting the service life. Due to its heavy action and load, large freewheeling, poor operating characteristics, silicon carbide arresters may suffer from transient overvoltage hazards and other reasons, accelerate valve aging, and have a short life span, generally 7 to 10 years, or even only 3 to 3 years. 5 years. The valve of the gapless zinc oxide arrester bears the grid voltage for a long time, the working conditions are severe, the inflection point voltage is low, the action frequency is large, and it may suffer from transient overvoltage hazards, temperature and heat damage, etc., quickly accelerate the valve aging, and have a short life. Some are shorter than silicon carbide arresters. The gap of the series gap zinc oxide arrester can ensure that the valve plate can only withstand high voltage during the overvoltage protection action process, and the time is very short (within 100μs). In other cases, the valve plate is isolated from the grid voltage or in an isolated state (when pure gap). Or in a low-potential state (composite gap resistance partial pressure), which greatly improves the long-term working conditions of the valve, and can also avoid transient overvoltage hazards and temperature thermal damage, and ensure that the temperature of the valve does not exceed 55°C, thereby ensuring the life of the arrester up to 20 More than years.
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
