Protective device for preventing overvoltage of top net

Abstract

The invention discloses a protective device for preventing the overvoltage of a top net. The protective device comprises an insulating shell, an overvoltage protection piece is arranged in the insulating shell, and a first conductive connecting piece and a second conductive connecting piece are arranged at the two ends of the insulating shell; the two ends of the overvoltage protection piece are electrically connected with the first conductive connecting piece and the second conductive connecting piece respectively, and a short-circuit protection piece is further arranged in the insulating shell; one end of the short-circuit protection piece is electrically connected with the first conductive connecting piece, and the other end of the short-circuit protection piece is electrically connected with a high-voltage bus; the rated current of the short-circuit protection piece is larger than a normal leakage current of the overvoltage protection piece and is smaller than a fault current of the overvoltage protection piece. The protection device has the following advantages and effects that the locomotive overvoltage protection can be met, and meanwhile, the defect of network burning caused by the short-circuit grounding formed by an existing locomotive overvoltage protection piece under a fault condition is overcome, so that the safety and reliability of locomotive operation are improved.

Description

Technical field [0001] The present invention relates to the field of power locomotive apparatus, particularly relates to an anti-top network overvoltage protection device. Background technique [0002] In present locomotive engine using overvoltage prevention overvoltage protection device, but over time, the overvoltage protection device performance degradation is inevitable, once the critical breakthrough point, the overvoltage breakdown protection element will, after the breakdown, the resistance is almost zero, is equivalent to the catenary directly to ground, while the short-circuit current will blow as catenary, which causes class C accidents, causing great damage to the entire operation of the vehicle, conventional protection devices fail status in the overvoltage protection element , can not be isolated from the overvoltage protector catenary system, the catenary system to ensure normal power supply, while likely to cause secondary damage to the car network. Inventive con...

AI Technical Summary

Problems solved by technology

[0002] At present, locomotives use locomotive overvoltage protection components to prevent overvoltage, but as time goes by, the performance of overvoltage protection components will inevitably decline. Once the critical point is broken, the overvoltage protection components will break down. If it is zero, it is equivalent to the direct grounding of the catenary, and the catenary will be blown due to the large short-circuit current, resulting in a class C accident, which will cause great losses to the entire vehicle operation. , it is impossible to isolate the overvoltage protection part from the catenary system to ensure the normal power supply of the catenary system, and it is easy to cause secondary damage to the vehicle network

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