Experimental device for multiple lightning current return strokes of surge protection device (SPD)

Abstract

The invention discloses an experimental device for multiple lightning current return strokes of a surge protection device (SPD). The experimental device comprises an optical fiber isolation intelligent impact control circuit, a single-power multi-feed high voltage charging circuit, a multi-pulse time sequence ignition circuit and a multiple return stroke discharging main circuit; and the experimental device is used for simulating the working condition and effect of multiple lightning current return strokes under natural lightning conditions. The experimental device can perform 1-8 times of 8 / 20 microseconds and other waved shaped lightning return stroke sequential tests for a single-path SPD, an arrester, a lightning protector, grounding materials and the like, wherein the return stroke times is selectable from 1 to 10; the time interval of the return stoke current is adjustable from 1-100 microseconds to 1-500 milliseconds; equal or non-equal test series for the return stoke current amplitudes each time are adjustable; the experimental device can be used for testing at most ten SPDs, arresters, lightning protectors, grounding materials and the like synchronously; and new measuresare supplied to the working condition stimulations and effect tests of multiple lightning current return strokes.

Description

technical field [0001] The invention belongs to the technical field of electrical engineering, and in particular relates to a test device for performing lightning current multiple return strike tests on surge protectors. Background technique [0002] Lightning strikes in nature refer to a complete lightning process, which lasts from hundreds of milliseconds to 1 second. A lightning includes one or several high-current pulse processes. Each high-current pulse process is called a lightning strike. The current intensity of each lightning strike is different. Generally, the first lightning strike is larger, or the first and last lightning strikes are larger, or the last lightning strike is larger. Large, the interval between lightning strikes is generally tens of milliseconds to hundreds of milliseconds. For the flickering of lightning strikes and lightning in the human eye in nature, it is caused by several lightning strikes. [0003] Surge protectors are used to protect elect...

AI Technical Summary

Problems solved by technology

[0003] Surge protectors are used to protect electrical and electronic products such as industrial process measurement and control devices from lightning surge damage. Lightning surge testing is a necessary test to investigate and verify the protection level and performance of surge protectors. The current test methods and devices Only the simulation of a single lightning current test can be carried out. Because the charging and discharging time of multiple repeated tests is more than tens of seconds, it is impossible to simulate and evaluate the electrodynamic effect and thermal effect accumulation of multiple lightning current strikes with a time interval of microseconds to milliseconds. The simulation and test of this type of effect test are very important for the performance assessment of products and devices such as surge protectors, lightning receptors, lightning arresters, and grounding materials.

For example, in the actual operation, it is found that the surge protector that has passed the single test of tens to hundreds of thousand amps of lightning current, in the case of natural lightning strikes, some relatively small lightning currents can cause damage to the surge protector. This is because Natural lightning often includes multiple return strikes, and the interval between each return strike is relatively short, usually ranging from tens of microseconds to hundreds of milliseconds. The cumulative effect of multiple return strikes leads to damage to the surge protector

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