Seven characteristics of zinc oxide arrester:
Flow capacity
This is mainly reflected in the arrester's ability to absorb various lightning overvoltages, power frequency transient overvoltages, and operating overvoltages.
Protection characteristics
Zinc oxide arresters are electrical products used to protect various electrical equipment in the power system from overvoltage damage and have good protection performance. Because the nonlinear volt-ampere characteristics of the zinc oxide valve are very good, only a few hundred microamps of current can pass through it under normal operating voltage, making it easy to design into a gapless structure, making it feature good protection performance, light weight, and small size. When overvoltage invades, the current flowing through the valve plate increases rapidly, while limiting the amplitude of the overvoltage and releasing the energy of the overvoltage. After that, the zinc oxide valve plate returns to the high resistance state, allowing the power system to operate normally.
Sealing performance
The arrester components adopt high-quality composite jackets with good aging performance and good air tightness. Measures such as controlling the compression amount of the sealing ring and adding sealant are adopted. The ceramic jacket is used as a sealing material to ensure reliable sealing and stable performance of the arrester.
Mechanical properties
The following three factors are mainly considered:
The seismic force that A bears;
BThe maximum wind pressure acting on the arrester;
The top of C arrester bears the maximum allowable pulling force of the conductor.
Decontamination performance
Gapless zinc oxide arresters have high pollution resistance.
The creepage distance level specified by the national standard is:
Level II moderately polluted area: specific creepage distance 20mm/kv
Level III heavy pollution area: specific creepage distance 25mm/kv
Level IV extremely polluted area: specific creepage distance 31mm/kv
High operational reliability
The reliability of long-term operation depends on the quality of the product and whether the product selection is reasonable. There are mainly three aspects that affect its product quality:
A The rationality of the overall structure of the arrester;
B The volt-ampere characteristics and aging resistance of zinc oxide valves;
C The sealing performance of the arrester.
Power frequency withstand capability
Due to various reasons in the power system, such as single-phase grounding, long-line capacitance effect, and load shedding, the power frequency voltage will increase or a transient overvoltage with a high amplitude will occur. The arrester has the ability to withstand a certain power frequency voltage increase within a certain period of time.
Yichang Hengyuan Technology Co., Ltd. specializes in the production of European-style cable joints, plug-and-pull heads, cable branch boxes, American-style elbow joints, high-voltage vacuum circuit breakers, high-voltage load switches, arresters, zinc oxide arresters, tank arresters, over-voltage protectors, counters, monitors, heat-shrinkable cable accessories, Manufacturer of cold shrink cable accessories, T-heads, wall bushings, European cable accessories, American cable joints, transformer neutral point protection devices, fuses, isolating switches, PT cable heads, elbow cable joints, 10kV outdoor terminals, switch cabinets, cable intermediate joints, cable accessories and other products
