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Seven characteristics of zinc oxide surge arresters



1. The flow capacity of the zinc oxide surge arresters is large

This is mainly reflected in the arrester's ability to absorb various lightning overvoltages, power frequency transient overvoltages, and operating overvoltages.


2. The protection characteristics of zinc oxide surge arresters

Zinc oxide arrester is an electrical product used to protect various electrical equipment in the power system from overvoltage damage, and has good protection performance. Because the nonlinear volt-ampere characteristics of the zinc oxide valve is very good, only a few hundred microamps of current flow through it under the normal working voltage, which is convenient to design into a gapless structure, so that it has the characteristics of good protection performance, light weight and small size. When the overvoltage invades, the current flowing through the valve increases rapidly, and at the same time limits the amplitude of the overvoltage and releases the energy of the overvoltage. After that, the zinc oxide valve returns to the high-resistance state to make the power system work normally.


3. The sealing performance of the zinc oxide arrester is good

The components of the surge arrester adopt a composite casing with good aging performance and good air tightness. Measures such as controlling the compression of the sealing ring and adding sealant are adopted. The ceramic casing is used as the sealing material to ensure reliable sealing and stabilize the performance of the arrester.


4. Mechanical properties of zinc oxide arrester

Mainly consider the following three factors:

A: Earthquake force withstood;

B: The gale pressure acting on the arrester;

C: The top of the arrester bears the maximum allowable tension of the wire.


5. Good anti-pollution performance of zinc oxide arrester

The gapless zinc oxide arrester has high pollution resistance.


6. High operational reliability of zinc oxide arrester

The reliability of long-term operation depends on the quality of the product and whether the selection of the product is reasonable. The product quality that affects it mainly has the following three aspects:

A The rationality of the overall structure of the arrester;

B Volt-ampere characteristics and aging resistance characteristics of zinc oxide valves;

C The sealing performance of the arrester.


7. Power frequency tolerance

Due to various reasons in the power system, such as single-phase grounding, long-term capacitance effect, and load shedding, etc., the power frequency voltage will rise or a transient overvoltage with a high amplitude will be generated. The arrester has the ability to withstand a certain power frequency voltage rise within a certain period of time.


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