Positive rail grounding fault positioning method of fourth rail backflow traction power supply system

A traction power supply system, ground fault technology, applied in the direction of fault location, information technology support system, fault detection according to conductor type, etc., can solve the problems affecting the operation efficiency and safety of the urban rail system, long-term problems, etc., to reduce the fault inspection Time, the effect of improving system operation efficiency and safety

Active Publication Date: 2020-08-25
CHENGDU SHANGHUA ELECTRIC CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It may take a long time to inspect the line, which affects the operating efficiency and safety of the urban rail system

Method used

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  • Positive rail grounding fault positioning method of fourth rail backflow traction power supply system
  • Positive rail grounding fault positioning method of fourth rail backflow traction power supply system
  • Positive rail grounding fault positioning method of fourth rail backflow traction power supply system

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Embodiment Construction

[0022] The implementation steps of the present invention will be further described below in conjunction with the accompanying drawings.

[0023] The implementation steps of the present invention are firstly to determine whether the fault occurs, secondly to determine the fault section and whether the fault is located in the uplink or downlink, and finally to determine the fault location.

[0024] 1. Judgment of failure

[0025] Since the current of the earth leakage protection device is not affected by the traction load, it is used as the criterion for the failure of the maglev power supply system. In actual engineering, the current threshold can be set (preferably 1A). When the current is less than this threshold, the earth leakage protection device current is considered to be zero. When the current of the ground leakage protection device in the traction substation of the whole line is zero, it can be judged that the system is operating normally; otherwise, it can be judged...

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PUM

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Abstract

The invention discloses a positive rail grounding fault positioning method of a fourth rail backflow traction power supply system, which specifically comprises the following steps of: determining which power supply section a fault section is located in and an uplink or downlink line of the section by using differential current, and determining a fault position by using a fault positioning formulaprovided by the invention. The method is not affected by traction loads, the unit resistance of the positive rail and the unit resistance of the negative rail can be different, the fault patrol time is shortened, and the system operation efficiency and safety are improved.

Description

technical field [0001] The invention belongs to the field of fault diagnosis of urban rail transit traction power supply system. In particular, it relates to a method for locating a positive rail grounding fault in a fourth rail backflow traction power supply system. Background technique [0002] Urban rail traction power supply system plays an important role in providing electric energy for trains. In order to reduce the corrosion of stray currents to underground metal pipelines, some urban rail traction power supply systems use the fourth rail return power supply method. Positive rail grounding faults may occur in the urban rail traction power supply system, which will cause the relevant protection devices to operate and cause power supply interruption. Due to the airtightness of urban rail transit vehicles, a longer power outage may cause passengers to have difficulty breathing and even lose their lives. Therefore, when a ground fault occurs in the urban rail traction ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/08
CPCG01R31/085G01R31/088Y04S10/52
Inventor 马庆安刘炜李鲲鹏潘卫国
Owner CHENGDU SHANGHUA ELECTRIC CO LTD
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