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Zinc Oxide Arrester Test Method, Zinc Oxide Arrester Test


1. Measurement of Insulation Resistance of Lightning Arrester
Insulation resistance measurement, for the FS arrester, is mainly to check the sealing condition, if the seal is not strict will inevitably cause internal moisture, so that the insulation resistance is significantly reduced. According to the requirements of the pre-test procedure, a 2500V megohmmeter shall be tested during the measurement, and the insulation resistance measured shall not be lower than 2500MΩ. Before the test, wipe the surface of the zinc oxide arrester porcelain sleeve clean, otherwise it will affect the accuracy of the test due to leakage current on the surface of the jacket. To do this, clean the surface of the porcelain sleeve with a clean cloth with good water absorption before the test, and use a thin metal wire to wind around the lower part of the first shed of the jacket and then connect it to the “shield” terminal of the megohmmeter. Eliminate the effects of. In the test, the megohmmeter and the arrester cable should be as short as possible, and ensure good electrical contact. When testing, the megohmmeter should be placed horizontally with uniform shaking speed, and 120 rpm is appropriate for good measurement results. Lightning arrester prices For the FZ type arrester, in addition to checking whether the inside is damp, it is also necessary to check whether the shunt resistance is broken or deteriorated. If the shunt resistance is aged or broken, the insulation resistance will be increased due to poor contact. To ensure that the measurement is accurate, it should be measured twice and compared to see if there is any change in the data. Measurements should be made using the same megohmmeter of the same voltage class, otherwise they cannot be compared.
2. DC 1 mA reference voltage test
During the test, a 0.75-fold 1 mA DC voltage was applied across the zinc oxide Surge Arrester (with a DC voltage ripple rate of not more than ±1.5%) when the current through the arrester stabilized at 1 mA. The voltage across the arrester should not be less than 25 kV.
3. DC leakage current test
After applying a 0.75-fold 1 mA DC voltage across the arrester , the leakage current through the zinc oxide arrester should not exceed 50 μA. During the test, when the leakage current reaches 30μA, the voltage will continue to rise. At this time, the leakage current will increase dramatically. At this time, the voltage should be increased slowly. If the boost pressure is too fast, the measurement will be inaccurate. In order to prevent the influence of leakage current on the surface of the porcelain sleeve, a good cloth with good water absorption should be used to wipe the outer surface of the porcelain sleeve clean before the test to eliminate the influence.
4. Measurement of the electric conduction current of the arrester with parallel resistance lightning arrester

The micro-amperemeter used for the electric conduction current of the parallel resistance lightning arrester type measuring belt should have an accuracy of not less than 1.5, and the connecting wires should be thick and short to reduce the influence of the wire resistance on the measurement. Also pay attention to the effects of stray currents and stray capacitance around high voltages during measurement. It should not be measured with an electrostatic voltmeter. Keep the test equipment away from devices that are prone to interfering magnetic fields, or set up shielding measures. When measuring the flow of electrical current, the application of the dc test voltage should start with a sufficiently low value and then slowly increase, apply the voltage in segments and read the value of the electrical conduction current in segments. After the voltage to be tested remains at the specified time, if the microampere meter pointer is not shaken, its display value is the electric conduction current value of the voltage. If the parallel resistance is aged and the contact is poor, the electric conduction current is significantly decreased. If the parallel resistance is broken, the electric conduction current is reduced to zero. If the parallel resistance itself is flooded, the electrical current will increase dramatically, typically up to 1000μA. In order to ensure the safety and accuracy of the number of high-voltage arrester tests, it is also necessary to compare the measured values of the electric conduction currents at different temperatures and convert them to the same value of the electric conduction current value. Experience has shown that for every 10°C increase in temperature, the electrical conduction current increases by approximately 3% to 5%.

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