Due to its good protective performance, zinc oxide arresters are widely used in AC and DC systems to protect power generation, substation equipment and other areas. However, during long-term live operation, the following problems may occur:
1. Zinc oxide arresters eliminate the series gap and can withstand system voltage and current flow for a long time. The active component in the current causes the valve plate to heat up, which may cause aging or even thermal breakdown of the valve plate over a long period of time.
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2. The inside of the zinc oxide arrester is damp or has poor insulation performance, which increases the power frequency current and intensifies the power consumption. In severe cases, it may lead to internal discharge.
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3. The zinc oxide arrester is contaminated by rain, snow, frost or dust, which causes the internal and external charge distribution to be different, resulting in a potential difference between the internal valve plate and the external porcelain sleeve, which will lead to radial discharge.
In serious cases, the above faults may cause the zinc oxide arrester to explode and affect the safe operation of the system. Therefore, it is very necessary to use zinc oxide arrester tester products to conduct live detection. The zinc oxide arrester tester product can measure its full current, resistive current fundamental wave and harmonic component, active power, phase angle value and other data, and then clearly and accurately analyze the operating status of the tested arrester, discover the internal defects of the arrester as early as possible, and provide guarantee for its normal operation.
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