Fault locating method and system of active power distribution network

A distribution network fault and distribution network system technology, applied in the direction of fault location, etc., can solve problems such as failure of traditional current fault location methods

Inactive Publication Date: 2014-09-17
STATE GRID CORP OF CHINA +3
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

If the short-circuit current provided by the distributed power supply exceeds the current detection setting value, the FTU of the downstream switch of the fault point will also report the information of the fault current flow to the main station, which will cause the failure of the traditional current fault location method

Method used

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  • Fault locating method and system of active power distribution network
  • Fault locating method and system of active power distribution network
  • Fault locating method and system of active power distribution network

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Embodiment Construction

[0018] The active distribution network fault location method of the present invention, such as figure 1 shown, including the following steps:

[0019] Step S1: Set each feeder terminal (FTU) fault current detection setting to be higher than the maximum load current. When a fault occurs in the distribution network, the fault current is much greater than the normal operating current. Setting the fault current detection value higher than the maximum load current can make the terminal do not need to check the fault when the feeder is working normally, and is in a relatively idle state.

[0020] Step S2: When a fault occurs in the active distribution network, the feeder terminal whose current is greater than the fault current detection setting value starts fault detection and reports the short-circuit current measurement value to the master station of the distribution network system.

[0021] Step S3: The main station of the distribution network system resets the fault current det...

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Abstract

The invention relates to a fault locating method and system of an active power distribution network. The method comprises the following steps that 1 fault current constant values of feeder terminals are set to be higher than the largest load current; 2 when the active power distribution network has faults, fault detection is started for the feeder terminal through which a fault current passes, and a short-circuit current measurement value is submitted to a power distribution network system master station; 3 the power distribution network system master station resets a fault current constant value according to the short-circuit current, passing through an outlet breaker, submitted by a circuit outlet switch feeder terminal and then judges whether the fault current passes through a switch of one certain circuit, and the fault section is recognized by adopting a common fault locating method. The system comprises the power distribution network master station, the feeder terminals and a communication system, and the power distribution network master station is connected with all the feeder terminals through the communication system to achieve information exchange. The method and system can locate the faults easily and rapidly, easy to achieve and good in use effect.

Description

technical field [0001] The invention relates to the technical field of electric power automation, in particular to a fault location method and system for an active distribution network, which is suitable for realizing automatic fault location after a fault occurs in a medium-voltage distribution line (feeder). Background technique [0002] At present, when a short-circuit fault occurs in the active distribution network, the distributed power supply injects a short-circuit current into the fault point, so that the downstream switch of the fault point also has a short-circuit current flow. If the short-circuit current provided by the distributed power supply exceeds the current detection setting value, the FTU of the downstream switch of the fault point will also report the information of the fault current flow to the master station, which will cause the failure of the traditional current fault location method. [0003] The short-circuit current flowing through the downstream ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/08
Inventor 李天友黄建业陈彬徐丙垠王敬华
Owner STATE GRID CORP OF CHINA
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