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

A surge protector and load test technology, applied in the direction of instruments, measuring electricity, measuring electrical variables, etc., can solve the problem of not being able to simulate the effect of lightning strikes, failing to achieve overvoltage protection, and not considering the accumulation of electric power and thermal effects of multi-pulse currents, etc. problem, to achieve the practical effect of the experimental method

Active Publication Date: 2020-01-31
SHANGHAI MUNICIPAL ELECTRIC POWER CO +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

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

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Experimental program
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Effect test

Embodiment

[0031] according to figure 1 Content, the surge protector multiple lightning current operating load test method of the present invention, the method includes the following steps:

[0032] Step 1: Record that the ambient air pressure in the laboratory is 102kPa, the temperature is 25°C, and the relative humidity is 45%. Select 20 pieces of low-voltage MOV valves for Class I surge protectors as test samples, the model is LS40K275QE7PK2, and its 8 / 20μs The nominal discharge current of the impulse current wave is 20kA, the maximum pulse discharge current (Iimp) of 10 / 350μs is 6500A, the length is 37.5mm, the width is 39mm, the height is 11.6mm, and the maximum continuous working voltage is 275V.

[0033] Step 2: Measure the residual pressure and The method of DC reference voltage, measuring the residual voltage (Ur) of the valve under the nominal discharge current is 1090V, the DC reference voltage (UDC1mA) when the DC reference current is 1mA is 418V, the freewheeling peak value...

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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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/12
CPCG01R31/1227
Inventor 司文荣傅晨钊张锦秀傅正财何雨微
Owner SHANGHAI MUNICIPAL ELECTRIC POWER CO
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