A kind of multi-lightning current action load test method of surge protector

Abstract

The invention relates to a multi-lightning current motion load test method of a surge protective device. The method comprises the following steps: on the basis of the standard motion load test methodof the surge protective device, one group of multi-waveform multi-pulse currents with a pulse interval of millisecond level is used for replacing the one group of five repeatedly applied currents of 8 / 20 milliseconds in the existing standard motion load test. The multi-waveform multi-pulse currents include one simulated lightning current first-time return current component, one to four simulated follow-up return current components, and one simulated return spacing long-duration current component; various performances of the surge protective device before and after the test are measured and compared; and the capability of withstanding the multi-lightning current impact is evaluated. Compared with the prior art, the load test method provided by the invention has the following beneficial effects: the capability of withstanding the actual lightning currents including the first-time return current component, the follow-up return current component, and the return spacing long-duration current component by the surge protective device in operation can be simulated and examined; and the examination test of the test sample is close to the actual situation.

Description

technical field [0001] The invention relates to a test technology of a surge protector, in particular to a test method for multiple lightning current action loads of a surge protector. Background technique [0002] Surge protector (SPD) is an important measure to protect indoor electronic equipment from lightning overvoltage, and its voltage limiting element is mainly metal oxide varistor (MOV). Due to factors such as a large number of installations and a wide range of distribution, the life assessment and test methods of SPDs are very important for the safe and effective operation of indoor electronic equipment. Especially for Class I SPDs installed at the entrance of buildings, they are extremely vulnerable to damage caused by lightning strikes, causing lightning overvoltages to invade power electronic systems, threatening the safe and effective operation of sensitive electronic equipment. Therefore, the characteristics of SPD under the actual lightning current impact are...

AI Technical Summary

Problems solved by technology

The single-pulse 8 / 20μs or 10 / 350μs waveform current used in the standard action load test cannot simulate the actual lightning strike effect with multiple current components, and the repeated application of single-pulse current does not take into account the electric shock caused by multiple pulse currents. Dynamic and Thermal Effects Cumulative

The impact of multiple impulse currents with an interval of ms level or even μs level on MOV has a cumulative effect, and the damage effect of multi-pulse current impacts on arresters is obviously much more severe than that of single-pulse current repeated application, so some have passed standard action loads The tested SPD often suffers from impact aging damage in actual use, failing to achieve the purpose of overvoltage protection

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