Novel method for detecting abnormality of alternating current circuit of traction substation

A technology for traction substations and AC circuits, applied in the direction of measuring current/voltage, measuring electricity, measuring devices, etc., can solve the problems of extremely weak monitoring and interference with the order of railway transportation, so as to prevent misoperation of protection and solve the problem of leapfrog action Effect

Active Publication Date: 2014-12-17
南京国电南自轨道交通工程有限公司
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Problems solved by technology

[0008] Therefore, judging from the current monitoring methods of traction substations, in actual operation, the monitoring of high-voltage fuse fuses in the voltage loop, poor contact, and common disconnection and poor contact in the current loop is extremely weak, which seriously interferes with the order of railway transportation.

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  • Novel method for detecting abnormality of alternating current circuit of traction substation
  • Novel method for detecting abnormality of alternating current circuit of traction substation
  • Novel method for detecting abnormality of alternating current circuit of traction substation

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Embodiment Construction

[0058] The present invention will be further elaborated below in conjunction with the accompanying drawings and specific embodiments.

[0059] Such as figure 1 As shown, the typical main wiring diagram of the traction substation of the present invention. The present invention is a scheme for realizing the abnormality of the AC circuit based on the apparent power.

[0060] Under the normal operation of the transformer in the traction station, the apparent power of the high and low voltage sides is basically balanced, but in the case of an abnormal AC circuit, the apparent power balance relationship will be broken. , It is easy to cause low-voltage start-up and over-current misoperation, so it is necessary to effectively detect the state of the AC loop to block or open the relevant protection nodes.

[0061] The abnormal alarm event flags related to the abnormality of the AC circuit are:

[0062] a) The voltage circuit on the high voltage side is abnormal;

[0063] b) The c...

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Abstract

The invention discloses a novel method for detecting the abnormality of an alternating current circuit of a traction substation. By an apparent power conservation principle in electricity, problems of the conventional technology for detecting the abnormality of voltage and current circuits of traction equipment are practically and reliably solved. The method mainly comprises steps of judging a voltage abnormality condition under an idle load and judging an apparent power S abnormality condition under a load, and is simple, convenient and high in applicability; the problem of override trip caused by the fusing of a high voltage fuse, which has the greatest influence on a traction power supply system at present is effectively solved; and the traction power supply equipment is safe and reliable. On the background that the mileage of electrified railways is increasing at present, the method can create good economic benefit.

Description

Technical field [0001] The invention involves the field of electrified railway traction power supply systems, and the invention creates an effective way to detect the current and voltage circuit abnormal detection function of traction substation. Background technique [0002] With the implementation of my country's "Medium and Long -term Railway Network Plan", especially in the context of the global financial crisis, my country has added 2 trillion yuan for railway construction. my country's railway construction has ushered in a new round of peaks. The safety of the power supply system must be technically a large step, and the safe operation of the railway cannot be separated from the protection of the traction power supply system.For a long time, the abnormal working status of the protection and current circuit of traction substations has caused the decent to stick to the equipment. In particular, the phenomenon of the 27.5kV high -voltage insurance fuse caused by the bare circu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/02G01R19/165
Inventor 包素丽曲伟刘苹殷少鹏
Owner 南京国电南自轨道交通工程有限公司
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