Transient power direction-based hand-in-hand line low-current grounding fault processing method

A fault handling method and low-current grounding technology, applied to electrical components, circuit devices, emergency protection circuit devices, etc., can solve problems such as low fault judgment efficiency, inability to immediately judge segmental switches, and secondary damage to electrical equipment, etc., to achieve The effect of improving the efficiency of troubleshooting and avoiding the risk of secondary power outages

Inactive Publication Date: 2018-12-07
ELECTRIC POWER RES INST OF GUANGXI POWER GRID CO LTD
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  • Abstract
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Problems solved by technology

And when the line fails, the sectional switch cannot be judged immediately, but must rely on the protection trip of the recloser or circuit breaker. After the feeder loses voltage, the sectionalizer can judge, so the fault judgment efficiency is low, and the sound section has experienced two power outages , easy to cause secondary damage to electrical equipment

Method used

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  • Transient power direction-based hand-in-hand line low-current grounding fault processing method
  • Transient power direction-based hand-in-hand line low-current grounding fault processing method
  • Transient power direction-based hand-in-hand line low-current grounding fault processing method

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Embodiment Construction

[0026] In order to better understand the present invention, the present invention will be further described below in conjunction with accompanying drawing and specific embodiment:

[0027] The small current grounding fault handling method of the hand-in-hand line based on the direction of transient power includes the following steps:

[0028] (1) Define the node close to the bus side as the root node, and the other nodes as child nodes. For the root node of the fault section and the root node of the healthy section upstream of the fault point, the transient zero-sequence current and transient zero-sequence voltage satisfy:

[0029]

[0030] For the sub-nodes of the fault section, the sub-nodes of the upstream sound section without faults downstream, and all the nodes of the healthy section downstream of the fault point, the transient zero-sequence current and transient zero-sequence voltage satisfy:

[0031]

[0032] Among them, u 0 (t) is the fault point zero sequence ...

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Abstract

The invention belongs to the low-current grounding fault technical field and relates to a transient power direction-based hand-in-hand line low-current grounding fault processing method. According tothe transient power direction-based hand-in-hand line low-current grounding fault processing method of the invention, a transient power direction and delay combined method is adopted to process the low-current grounding fault of a hand-in-hand line; a fault section can be judged on the basis of transient power directions; and action delay is set for switches; and corresponding switches at the upstream or downstream of the fault section are controlled to trip after set delay time comes. The method does not rely on communication, and does not affect the normal power supply of a valid section atthe upstream of a fault point; and a risk that a valid section line undergoes secondary power failure can be avoided, and fault processing efficiency can be improved.

Description

technical field [0001] The invention relates to the technical field of small current grounding fault processing, in particular to a small current grounding fault processing method for hand-in-hand lines based on transient power direction. Background technique [0002] In the feeder automation system using the recloser voltage-time sectionalizer and the hand-in-hand line, the power switch of the distribution line adopts a recloser with two reclose functions, and the delay time for the first reclose is longer (typically 15s), the delay time of the second reclosing is short (typically 5s), and the section switch and tie switch use voltage-time section section. When a fault occurs, the recloser as a power switch trips, and then the sectionalizer along the line is opened due to voltage loss. After a delay, the recloser recloses for the first time, and the voltage-time sectionalizer as a sectional switch is set at The first set of functions is to delay X-time limit automatic clos...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/26H02H1/00H02H3/06
CPCH02H7/266H02H1/0084H02H3/006H02H3/06
Inventor 周杨珺俞小勇欧阳健娜秦丽文高立克梁朔李珊李克文欧世锋陈绍南陈千懿
Owner ELECTRIC POWER RES INST OF GUANGXI POWER GRID CO LTD
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