Zinc oxide arrester tester is used to test the arrester electrical parameters of the instrument, can be used for live test in the test site, but also used for laboratory outage maintenance. Zinc oxide arrester tester what characteristics, the following one for you to introduce.
1. Large flow capacity
The current performance is mainly reflected in the lightning arrester has the ability to absorb all kinds of lightning overvoltage, power frequency transient overvoltage and operation overvoltage. The current capacity of zinc oxide arrester is in line with or even higher than the requirements of national standards. The line discharge grade, energy absorption capacity, 4/10 ns high current impact tolerance, 2ms square wave flow capacity and other indicators reach the domestic high level.
Two, excellent protection characteristics
Zinc oxide arrester is used to protect all kinds of electrical equipment in power system from overvoltage damage of electrical products, has good protection performance. Because of the excellent nonlinear voltammetry characteristics of zinc oxide valve sheet, only a few hundred microamps of current pass under the normal operating voltage, it is easy to design a no-gap structure, so that it has the characteristics of good protection performance, light weight and small size. When overvoltage invades, the current flowing through the valve plate increases rapidly, and limits the amplitude of overvoltage and releases the energy of overvoltage. After that, the zinc oxide valve plate restores the state of high resistance to make the power system work normally.
Three, good sealing performance
Lightning arrester components with good aging performance, good air tightness of high-quality composite coat, using control of sealing ring compression and coated sealant and other measures, ceramic coat as sealing material, to ensure reliable sealing, so that the performance of the lightning arrester is stable.
Four, mechanical properties
The mechanical properties are measured in three aspects: the seismic force, the wind pressure acting on the lightning arrester and the allowable tension of the wire at the top of the lightning arrester.
Five, good decontamination performance
The non - gap zinc oxide arrester has high pollution resistance. Specific creepage distance class stipulated by the national standard is:
1. Grade II medium polluted area: specific creepage distance 20mm/kV
2, Class III heavy pollution area: creepage distance 25mm/kV
3. Class IV extremely heavy polluted area: specific creepage distance 31mm/kV
High operation reliability
The reliability of long-term operation depends on the quality of the products and the reasonable selection of the products. There are three main factors affecting its product quality. One is the rationality of the overall structure of the lightning arrester. Second, the voltammetric characteristics and aging resistance of zinc oxide valve; The third is the sealing performance of the lightning arrester.
Seven, power frequency tolerance
Due to the power system such as single-phase grounding, long line capacitance effect and load rejection and other reasons, will cause the increase of power frequency voltage or produce high amplitude transient overvoltage, lightning arrester has a certain time to withstand a certain power frequency voltage rise.
Wuhan Xinsheng neng is a professional power testing equipment manufacturers, welcome to inquire: 0312-3188568! Wuhan Xinshengneng official website: www.whxsn.com
