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Limit condition test system for direct-current switching device

A technology of extreme working conditions and DC switching, applied in the direction of circuit breaker testing, etc., can solve problems such as high cost, large impact on the power grid, and inability to achieve precise control, and achieve low cost, fast switching speed, and fast shutdown response Effect

Pending Publication Date: 2022-04-12
HEFEI KEWELL POWER SYST CO LTD
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention lies in the problems that the prior art testing method for DC switching devices has a large impact on the entire power grid, high cost, inability to achieve precise control, safety risks and low degree of automation

Method used

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  • Limit condition test system for direct-current switching device
  • Limit condition test system for direct-current switching device
  • Limit condition test system for direct-current switching device

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Embodiment Construction

[0078] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are part of the present invention Examples, not all examples. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0079] Such as figure 1 As shown, an extreme working condition test system for DC switching devices, including bidirectional DC power supply DC, capacitor C, first IGBT switch S1, second IGBT switch S2, rated load R1, peak load R2 and multiple DUTs , the input terminal of the bidirectional direct current power supply DC is connected to the power grid, the output positive termina...

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Abstract

The invention discloses a limiting condition test system for a direct-current switching device, which comprises a bidirectional direct-current power supply, a capacitor, a first insulated gate bipolar transistor (IGBT) switch, a second IGBT switch, a rated load, a peak load and a plurality of tested pieces, the output positive end of the bidirectional direct-current power supply, one end of the capacitor and one end of each tested piece are connected, the output negative end of the bidirectional direct-current power supply is connected with the other end of the capacitor, the other end of each tested piece, one end of the rated load and one end of the peak load are connected, and the other end of the rated load is connected with the other end of the capacitor through the first IGBT switch. The other end of the peak load is connected with the other end of the capacitor through the second IGBT switch; the method has the advantages that the impact on the whole power grid is small, the cost is low, accurate control is achieved, safety risks do not exist, and the automation degree is high.

Description

technical field [0001] The invention relates to the testing field of DC electrical switches, and more specifically relates to a limit working condition testing system for DC switching devices. Background technique [0002] For DC switching devices such as relays and contactors, their stability is usually checked through electrical life tests, and their performance under extreme conditions is verified through capacitive load tests, breaking capacity tests under extreme conditions, and short-circuit withstand capacity tests. Under the product performance and reliability. The currents in the latter three tests are very large, usually need to reach 5kA ~ 15kA, need to generate a large amount of energy in a short time, and there are high test risks due to possible product failures and other problems. [0003] Traditional testing methods such as Chinese Patent Application No. CN201822160530.9 disclose a circuit for improving the DC breaking capacity of an AC switch. The AC test e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/327
Inventor 谢鹏飞黄才能彭凯唐德平
Owner HEFEI KEWELL POWER SYST CO LTD
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