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

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...

AI Technical Summary

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

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