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Date：07-22-2022
1. Flow capacity
This is mainly reflected in the arrester’s ability to absorb various lightning overvoltages, power frequency transient overvoltages, and operating overvoltages.
2. Protection features
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 plate are very good, only a few hundred microamperes of current can pass under normal operating voltage, which is convenient to design a gap-free structure, so that it has good protection performance, light weight and small size. feature. When the overvoltage invades, the current flowing through the valve plate increases rapidly, and at the same time, the amplitude of the overvoltage is limited, and the energy of the overvoltage is released. After that, the zinc oxide valve plate returns to the high resistance state, so that the power system can work normally.
3. Sealing performance
The arrester element adopts a high-quality composite jacket 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 jacket is used as a sealing material to ensure reliable sealing and stable performance of the arrester.
4. Mechanical properties
The following three factors are mainly considered: the seismic force to be endured; the maximum wind pressure acting on the arrester; the maximum allowable tensile force of the wire on the top of the arrester.
5. Decontamination performance
The gapless zinc oxide arrester has high contamination resistance.
The creepage ratio specified by the national standard is: Class II medium pollution area: creepage ratio 20mm/kv; Class III heavy pollution area: creepage ratio 25mm/kv; Class IV extra heavy pollution area: creepage ratio 31mm/kv.
6. High operational reliability
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: the rationality of the overall structure of the arrester; the volt-ampere characteristics and anti-aging characteristics of the zinc oxide valve plate; the sealing performance of the arrester.
7. Power frequency tolerance
Due to various reasons in the power system, such as single-phase grounding, long-line capacitance effect and load rejection, 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 within a certain period of time. Voltage boost capability.
