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Self-adapting three-phase reclosure decision method of ultra-high voltage electric power line with shunt reactor

A transmission line and reclosing technology, which is applied to circuit devices, emergency protection circuit devices, electrical components, etc., can solve the problems of difficult research on three-phase adaptive reclosing, achieve favorable stability, simple algorithm, and ensure continuity Effect

Inactive Publication Date: 2008-12-03
TIANJIN UNIV
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  • Abstract
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  • Application Information

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Problems solved by technology

However, due to the little information that can be extracted from the line after the three-phase trip, the research on the three-phase adaptive reclosing is very difficult, and no practical method has appeared so far.

Method used

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  • Self-adapting three-phase reclosure decision method of ultra-high voltage electric power line with shunt reactor
  • Self-adapting three-phase reclosure decision method of ultra-high voltage electric power line with shunt reactor
  • Self-adapting three-phase reclosure decision method of ultra-high voltage electric power line with shunt reactor

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Embodiment Construction

[0026] The invention provides a method for judging the fault nature of an adaptive three-phase reclosing fault of an ultra-high voltage transmission line with a shunt reactor. Permanent failure. The invention realizes the self-adaptive action of the three-phase reclosing by detecting the amplitude of the differential mode voltage in the residual voltage after the three-phase tripping of the line and comparing it with the setting value.

[0027] Its judgment process is as follows figure 1 Shown: First, a multi-phase fault occurs on the line and the three-phase trip of the circuit breakers on both sides of the line is judged to determine whether a three-phase trip occurs on both sides of the line. If it is a three-phase fault (including phase-to-phase and grounding), take the three-phase Voltage instantaneous value and calculate the instantaneous value of α, β mode voltage (u α = u A -u B , u β = u A -u C ), and then take the frequency of the α and β mode voltages (the fr...

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Abstract

The invention discloses an ultra-high voltage transmission line self-adaptive three-phase recloser judging method with a shunt reactor. The line residual voltage mode component amplitude is taken as criterion and the failure property can be exactly judged before the circuit breakers at two sides of the transmission line are reclosed, thus respectively realizing the quick action of the recloser during the transient failure and the locking of the recloser during the permanent failure. Compared with the prior art, the judging method of the invention avoids the secondary impact on the electric installation and the threatening on the stability of the system caused by that the circuit breaker is reclosed at the permanent failure in three-phase, quickens the closing time during the transient failure, is beneficial for the stability of the system and the continuity of the power supply, can only use a micro-computer protection device to process the sampling data of the voltage at the line termination without adding any devices, affects no action time of the protection and has simple arithmetic.

Description

technical field [0001] The invention relates to an automatic reclosing control method of a transmission line in a power system, in particular to a method for realizing the judgment of the adaptive three-phase reclosing fault property (permanent fault or transient fault) of a transmission line. Background technique [0002] Most of the faults on overhead lines are instantaneous, and the normal operation of the system can be restored by reconnecting the line after the arc is extinguished at the fault point. Therefore, in order to ensure the continuous and stable power supply of the power system, automatic reclosing technology is widely used in high-voltage power grid application. The current automatic reclosing devices are divided into two types: single-phase reclosing for single-phase fault, single-phase tripping, and single-phase reclosing and three-phase reclosing for multi-phase fault, three-phase tripping, and three-phase reclosing In this way, it does not detect whether...

Claims

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Application Information

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IPC IPC(8): H02H3/06H02H7/26
Inventor 李永丽李博通
Owner TIANJIN UNIV
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