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Petal-shaped power distribution network trunk line time-limited current quick-break protection acceleration method

A technology for rapid current interruption and power distribution network, which is applied to emergency protection circuit devices, measurement of electricity, electrical components, etc., can solve the problems of acceleration time-limited current rapid interruption protection, insufficient quickness, etc., and achieves good quickness.

Active Publication Date: 2020-11-03
STATE GRID HEBEI ELECTRIC POWER CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Constructing the sudden change criterion of the petal-shaped distribution network main line to accelerate the action of time-limited current quick-break protection not only overcomes the problem of insufficient quickness of traditional current protection, but also has the advantage of adapting to symmetrical faults

Method used

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  • Petal-shaped power distribution network trunk line time-limited current quick-break protection acceleration method
  • Petal-shaped power distribution network trunk line time-limited current quick-break protection acceleration method
  • Petal-shaped power distribution network trunk line time-limited current quick-break protection acceleration method

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Embodiment Construction

[0037] The present invention will be further described in detail below through the specific examples, the following examples are only descriptive, not restrictive, and cannot limit the protection scope of the present invention with this.

[0038] An acceleration method for time-limited current quick-break protection of a main line of a petal-shaped distribution network, which mainly utilizes the current mutation generated by the successive actions of the protection at both ends of the main line of the petal-shaped distribution network to realize the accelerated action of the time-limited current quick-break protection. The specific steps are as follows:

[0039] (1) if figure 1 As shown, is a schematic diagram of a 10kV petal-shaped distribution network specifically applied in this embodiment. The voltage acquisition device at the protection place collects the power frequency of each phase voltage during normal operation And the power frequency of each phase voltage at the ...

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Abstract

The invention relates to a petal-shaped power distribution network trunk line time-limited current quick-break protection acceleration method. The method comprises the following steps of calculating apositive sequence voltage power frequency quantity and a positive sequence current amplitude at a protection position during a fault; obtaining a positive sequence impedance value of a protected line, positive sequence impedance of a lower line in a protection direction and a minimum value of a fault current break variable measured by successive action protection of a petal-shaped power distribution network trunk line; judging a fault type; meanwhile, judging the fault direction; selecting an adaptive time-limited current quick-break protection setting formula and a current break variable setting formula according to a fault type judgment result when a fault direction element judges that a fault occurs in the forward direction; and when the positive sequence current is greater than the time-limited current quick-break protection setting value and less than the quick-break current setting value, and the current break variable is greater than the break variable setting value, judging the protection to be an internal fault. According to the invention, the problem of insufficient quickness of traditional current protection is overcome, and the method has the advantage of adapting to symmetric faults.

Description

technical field [0001] The invention relates to the field of relay protection of power system distribution network, and relates to an acceleration action method for time-limited current quick-break protection of distribution network, in particular to an acceleration method for time-limited current quick-break protection of petal-shaped main line of distribution network. Background technique [0002] With the improvement of users' requirements on the reliability of distribution network, the petal-shaped grid structure is gradually applied to distribution network, and the protection of petal-shaped distribution network is becoming more and more important to the safety and reliability of power system. The petal-shaped urban distribution network operates in a network, the grid structure is special, and the main line of the distribution network is short. When a short-circuit fault occurs on the main line, the fault current is large, which seriously threatens the safe and reliable ...

Claims

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Application Information

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IPC IPC(8): H02H7/26H02H7/28H02H1/00G01R31/08
CPCH02H7/26H02H7/28H02H1/0007G01R31/086G01R31/088
Inventor 赵自刚李永丽任江波陈晓龙常风然何亚坤耿少博王伟康孙广辉王强曹树江
Owner STATE GRID HEBEI ELECTRIC POWER CO LTD
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