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Overcurrent protection methods and devices for line between/inside transformer station in ring network power supply system

A technology of overcurrent protection and power supply system, which is applied in the direction of emergency protection circuit devices, overcurrent protection, electrical components, etc. It can solve problems such as poor failure, and achieve the effect of simple judgment method and fast protection action

Active Publication Date: 2019-02-22
XUCHANG XJ SOFTWARE TECH +4
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide an overcurrent protection method and device for inter-substation / internal lines in a ring network power supply system, which is used to solve the problem of poor failure of the backup protection system in the prior art for the overcurrent protection of incoming lines on the lines between substations
[0007] The present invention also provides an overcurrent protection method for substation internal lines in a ring network power supply system, which is used to solve the problem of poor failure of the backup protection system in the prior art for the overcurrent protection of the incoming line in the substation. Correspondingly, to solve To solve the above technical problems, the present invention also provides an overcurrent protection device for the line in the substation in the ring network power supply system

Method used

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  • Overcurrent protection methods and devices for line between/inside transformer station in ring network power supply system
  • Overcurrent protection methods and devices for line between/inside transformer station in ring network power supply system
  • Overcurrent protection methods and devices for line between/inside transformer station in ring network power supply system

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Embodiment 1

[0054] This embodiment provides an overcurrent protection method for the lines between substations in the ring network power supply system, which is used for overcurrent protection when a fault occurs on the line between the substations in the ring network power supply system, and improves the reliability of the ring network power supply system sex.

[0055] The ring network power supply system used in the overcurrent protection method for the lines between substations in the ring network power supply system provided by this embodiment is as follows: figure 1 As shown, including the first main substation and the second main substation, a plurality of sub-substations are set between the first main substation and the second main substation, and each sub-substation is used for power consumption in the corresponding subway station or intercity light rail station The device is powered.

[0056] Each sub-substation is equipped with two sections of busbars, namely the corresponding ...

Embodiment 2

[0072] This embodiment provides an overcurrent protection method for lines between substations in a ring network power supply system, which is used for overcurrent protection when a fault occurs on a line between substations in a ring network power supply system, and improves the reliability of the ring network power supply system .

[0073] The ring network power supply system used in the overcurrent protection method for the lines between substations in the ring network power supply system provided by this embodiment is as follows: figure 1 As shown, including the first main substation and the second main substation, multiple sub-substations are set between the first main substation and the second main substation, each sub-substation is provided with a corresponding power distribution cabinet, and the power distribution cabinet It is used to supply power to electrical equipment in corresponding subway stations or intercity light rail stations.

[0074] Each sub-substation i...

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Abstract

The invention provides an overcurrent protection method and device for a line between / inside a transformer station in a ring network power supply system. The overcurrent protection method includes thefollowing steps: after optical fiber differential protection of the ring network power supply system fails, when an incoming line overcurrent protection device detects that a current of a corresponding line is greater than a corresponding protection current, if a corresponding outgoing line overcurrent protection device detects that the current of the corresponding line is not greater than the corresponding protection current, the incoming line protection device executes an overcurrent protection action; and when the outgoing line overcurrent protection device detects that the current of thecorresponding line is not greater than the corresponding protection current, if the corresponding incoming line overcurrent protection device detects that the current of the corresponding line is greater than the corresponding protection current, the outgoing line protection device executes the overcurrent protection action. According to the technical scheme provided by the method and the device,the judging method is simple, is fast in protection action, is not restricted by protection areas, and can solve the problem that failure is poor when a backup protection system performs incoming lineovercurrent protection on the line between transformer substation in the prior art.

Description

technical field [0001] The invention belongs to the technical field of relay protection for power systems, and in particular relates to an overcurrent protection method and device for inter-substation / internal lines in a ring network power supply system. Background technique [0002] At present, each station in the domestic urban rail transit is equipped with a corresponding substation, and the substation can be divided into a traction substation and a traction step-down hybrid substation. The substation is equipped with a substation cabinet, and the substation cabinet generally adopts a single busbar section to supply power, that is, the busbar in the same substation cabinet is divided into two sections, and the two busbar sections are connected to each other through a bus tie circuit breaker. . Each section of busbar is equipped with corresponding incoming and outgoing lines, and the incoming and outgoing lines of the busbar in each substation are respectively connected t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/26H02H7/22H02H3/08
CPCH02H3/08H02H7/22H02H7/262
Inventor 翟浩冲刘星李俊刚任雪涛姜睿智朱若松刘洋薛建民胡源奇郭华刘虎吴水兰胡志明周小金刘浩旭罗志杰
Owner XUCHANG XJ SOFTWARE TECH
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