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Method for identification of distribution line short circuit permanent faults and temporary faults through energy storage and discharge of capacitor

A technology for transient faults and permanent faults, applied in fault locations, circuit devices, emergency protection circuit devices, etc., can solve problems such as instantaneous faults in power distribution lines, and achieve low cost, clear and reliable signals

Inactive Publication Date: 2017-12-15
STATE GRID CORP OF CHINA +3
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0016] The purpose of the present invention is to provide a method for identifying short-circuit permanent faults and transient faults of distribution lines by capacitor energy storage and discharge, so as to solve the problem of judgment of transient faults and permanent faults of distribution lines

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  • Method for identification of distribution line short circuit permanent faults and temporary faults through energy storage and discharge of capacitor
  • Method for identification of distribution line short circuit permanent faults and temporary faults through energy storage and discharge of capacitor

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Embodiment Construction

[0033] The present invention will be further described below in conjunction with accompanying drawing.

[0034] see figure 1 As shown, the present invention uses capacitor energy storage discharge to identify a method for short-circuit permanent faults and transient faults of distribution lines. A capacitor device and a grounding switch are connected in parallel between the three phases of the line side of the distribution line outlet circuit breaker and the ground; During normal operation, the line charges the capacitor of the shunt capacitor device. After the charging is completed, the shunt capacitor is disconnected from the line, and the grounding switch is always open when it is normal.

[0035] The capacitor device is connected in parallel between the three phases of the line side of the distribution line circuit breaker and the ground in a neutral point grounding manner, including rectification circuits, pre-charging and bypass switching circuits, parallel capacitors, b...

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Abstract

The present invention discloses a method for identification of distribution line short circuit permanent faults and temporary faults through energy storage and discharge of a capacitor. The method comprises the following steps: 1) a capacitor device and an earth switch are connected in parallel between the three phases of the line of a distribution line outgoing breaker and the ground; a line charges a capacitor connected in parallel with the capacitor device when normal operation, the parallel capacitor is disconnected from the line after the charging is completed, and the earth switch is always located in an opening state when the earth switch is normal; and 2) after distribution line faults cause three-phase tripping of the outgoing breaker, different paralleled capacitors are selected according to different fault types are input and cooperated with the motion of the earth switch after a setting time, and it is determined that the fault property is a temporary fault or a permanent fault according to the voltage changing features within a period of time after the capacitors are input. The method provided by the invention depends on the voltages of two ends of the capacitors to identify the permanent faults and temporary faults, and is obvious and reliable in signal.

Description

technical field [0001] The invention belongs to the field of distribution network relay protection, in particular to a method for identifying permanent faults and instantaneous faults of distribution lines by using capacitor energy storage and discharge. Background technique [0002] Power system reclosing is of great significance to improve the reliability of power grid power supply. When the line fault causes the protection action switch to trip, the reclosing device will drive the switch to automatically reclose after the preset delay time arrives. If the fault is instantaneous, it will reclose If successful, the power supply will be restored quickly; if the fault is permanent, the reclosing will fail, the protection will act again, and the switch will trip again. However, there is a big problem with the above reclosing strategy: it does not distinguish between instantaneous and permanent faults before reclosing, and reclosing itself has a certain degree of heuristics. W...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/08G01R31/02H02H3/06
CPCG01R31/085G01R31/50H02H3/06
Inventor 刘健张志华张小庆刘星芮骏黄河孟乐
Owner STATE GRID CORP OF CHINA
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