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A method for restoring power supply after DC grounding protection starts tripping

A DC grounding and power restoration technology, applied in the field of maglev systems, can solve the problem of high fault identification efficiency, achieve the effects of high fault identification efficiency, fast power restoration, overcoming fault identification and power restoration

Active Publication Date: 2017-12-08
CHINA RAILWAY SIYUAN SURVEY & DESIGN GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of the above defects or improvement needs of the prior art, the purpose of the present invention is to provide a method for restoring power supply after the DC grounding protection starts tripping, wherein by improving its key process steps such as fault judgment, compared with the prior art It can effectively solve the problem of restoring power supply after the DC grounding protection starts tripping in the power supply system, especially for magnetic levitation systems, with high fault identification efficiency and rapid power supply recovery

Method used

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  • A method for restoring power supply after DC grounding protection starts tripping
  • A method for restoring power supply after DC grounding protection starts tripping

Examples

Experimental program
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Effect test

Embodiment 1

[0020] The working condition of this embodiment is: when any one feeder cabinet is running, the DC grounding protection device detects a fault.

[0021] Response processing consists of the following steps:

[0022] (1) The feeder cabinet trips immediately, and then performs a test switch-on;

[0023] (2) If the test is closed successfully and the DC protection trip signal is no longer received, it will operate normally;

[0024] (3) If the DC ground protection trip signal is received immediately after the test is closed, the feeder cabinet will trip and be locked.

Embodiment 2

[0026] The working condition of this embodiment is: when any two feeder cabinets (named A and B respectively) are running, the DC grounding protection device detects a fault.

[0027] Response processing is divided into the following two cases:

[0028] Situation 1: If A and B are both uplink or downlink at the same time, when the DC ground protection trip signal is received for the first time, they all trip, and at the same time, they are tested and closed together. If the DC ground protection trip signal is received again after closing, then trip and lockout;

[0029] Case 2: If A and B are not in the uplink or downlink at the same time, follow the steps below:

[0030] (1) All feeder cabinets A and B trip, and then send a test closing signal to feeder cabinet A;

[0031] (2) If no DC grounding protection trip signal is received after the A feeder cabinet is successfully tested and closed, it is considered that the line is faultless, and no test closing signal is sent to t...

Embodiment 3

[0036] The working condition of this embodiment is: when any three feeder cabinets (named A, B, and C respectively) are running, the DC grounding protection device detects a fault.

[0037] Response processing is divided into the following two cases:

[0038] Case 1: Two upstream feeder cabinets (named A and B respectively) and one downstream feeder cabinet (named C), follow the steps below:

[0039] (1) The three feeder cabinets are running normally, and a DC grounding protection fault occurs. The three feeder cabinets trip immediately, and then send a test closing signal to the upstream, and the two upstream feeder cabinets A and B are tested to close. If A and B are closed If the DC grounding protection trip signal is not received after that, it is considered that there is no fault in the uplink, and no test closing command will be issued to the downlink;

[0040] (2) If the DC grounding protection trip signal is received again after the upstream test is closed, the A and ...

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Abstract

Method for recovering power supply after tripping activated for direct-current ground protection, comprising the steps of: (1) fault detection: a direct-current ground protection device being connecting to a power supply system for detecting a fault in the power supply system, wherein the power supply system comprises two uplink grid contact lines, two downlink grid contact lines and several feeder cabinets, any one of the feeder cabinets being connected to the two uplink grid contact lines or the two downlink grid contact lines; all the feeder cabinets are connected to the direct-current ground protection device; and when the direct-current ground protection device detects a fault, tripping occurs to all the feeder cabinets; and (2) response processing: according to whether the feeder cabinets are simultaneously connected to the two uplink grid contact lines and the two downlink grid contact lines, processing is carried out separately according to two conditions. Due to the improvements in the fault recognition principle of a power supply system, the method for recovering power supply after tripping activated for direct-current ground protection, and the like, the beneficial effects of high failure recognition rate and high power supply recovery speed can be achieved.

Description

technical field [0001] The invention belongs to the field of urban rail transit, and more specifically relates to a method for restoring power supply after a DC grounding protection starts tripping. After the trip is initiated, the power supply can be quickly restored. Background technique [0002] For railway facilities, such as high-speed rail, subway, maglev transportation, tram and other railway facilities, the electrical design is the key to drive lines and fault protection, and has an important impact on the safe operation of railway facilities. At present, rail transit (such as subways and trams) does not have DC grounding protection, and because the DC traction power supply system of maglev rail transit is compared with the traditional subway power supply method, its negative pole does not return through the running rail, but a negative pole rail Backflow, therefore, in order to detect DC ground leakage and ensure personal safety, it is necessary to install a set of...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H3/06H02H1/00
CPCH02H1/0007H02H3/066H02H3/06
Inventor 盛蓉蓉吴树强许龙
Owner CHINA RAILWAY SIYUAN SURVEY & DESIGN GRP
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