The main problems in the operation of the zinc oxide arrester characteristic tester:

The zinc oxide arrester characteristic tester is an instrument used to test the electrical performance of zinc oxide arresters. The instrument is suitable for the detection of live or power failure of zinc oxide arresters of various voltage levels, so as to promptly discover dangerous defects such as dampness of the internal insulation of the equipment and aging of the valve.

The zinc oxide arrester characteristic tester is simple to operate and easy to use. The whole measurement process is controlled by a single-chip microcomputer. It can measure the full current, resistive current and its harmonics of the zinc oxide arrester, power frequency reference voltage and its harmonics, active power and phase difference , The large screen can display the true waveforms of voltage and current.　　

The zinc oxide arrester characteristic tester uses digital waveform analysis technology, and uses software anti-interference methods such as harmonic analysis and digital filtering to make the measurement results accurate and stable. It can accurately analyze the content of the fundamental wave and the 3-7th harmonic, and can overcome Interphase interference influence, correctly measure the resistive current of the side-phase arrester.　　

The editor introduces the main problems in the operation of zinc oxide arresters, and judges whether the valves of the zinc oxide arresters are aging or damp, usually observe the changes in the leakage current flowing through the zinc oxide valves during normal operation, that is, observe whether the resistance increases As a basis for judgment.　　

1. The main problems in the operation of zinc oxide arresters 　　

1) Since the zinc oxide arrester has cancelled the series gap, it will withstand the system voltage for a long time, and the current will flow. The active power component in the current generates heat on the valve plate, which induces changes in the volt-ampere characteristics. The result of long-term action will cause the valve plate to age and even thermal breakdown.　　

2) When the zinc oxide arrester is used by impulse voltage, the valve plate will also age under the action of impulse voltage energy.　　

3) Moisture inside the zinc oxide arrester or poor insulation performance will increase the power frequency current, increase the power consumption, and cause internal discharge in severe cases.　　

4) The zinc oxide arrester is polluted by rain, snow, condensation or dust. Due to the difference of internal and external electrical releases, there is a relatively potential difference between the internal valve plate and the external ceramic sleeve, which leads to the occurrence of radial discharge.　　

2. Zinc oxide arrester mainly aims at the following aspects: 　　

1) Thermal breakdown of zinc oxide arrester 　　

The final cause of the thermal breakdown of the zinc oxide arrester generator is that its heating power is greater than its heat dissipation power. The heating power of the zinc oxide valve plate depends on the current and voltage on it (current is the active component of the current flowing through the valve plate).　　

2) Moisture inside the zinc oxide arrester 　　

If the seal is not tight, it will cause moisture inside the arrester or moisture ingress during installation, which will increase the total current of the arrester under voltage. When damp to a certain degree, discharge will occur along the surface of the zinc oxide valve disc or the inner wall of the porcelain sleeve, causing the arrester to explode.　　

The increase in the total current caused by the damp of the zinc oxide lightning arrester is caused by the increase in the resistive leakage current. It can be inferred whether it is damp or not by detecting the change of the viewing angle.　　

In summary, the above faults can be reflected by changes in resistive leakage current. Knowing the changes in the resistive leakage current of zinc oxide, such as lightning arresters, can predict whether the above-mentioned failures will occur.