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Differential protection method based on phasor set

A differential protection and aggregation technology, applied in the direction of automatic disconnection emergency protection devices, emergency protection circuit devices, electrical components, etc., can solve problems such as exit, and achieve the effect of unaffected sensitivity and reliability.

Inactive Publication Date: 2016-08-31
XUJI GRP +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a phasor-based differential protection method to solve the problem that the sampling value of the current intelligent substation differential protection device adopts the 9-2 network access method and exits when out of sync

Method used

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  • Differential protection method based on phasor set
  • Differential protection method based on phasor set
  • Differential protection method based on phasor set

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Embodiment Construction

[0021] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0022] Theoretically, there are infinitely many current phasors at each moment in a continuous time period. In practice, we can calculate a phasor at each sampling point according to the sampling points included in the time window. If the multi-moment phasors within the step time window constitute a phasor set, then there must be synchronous phasors in this phasor set, and it is necessary to find out the differential current and braking current corresponding to the synchronous phasors in the phasor set To complete the differential protection, the method of differential protection includes the following steps:

[0023] The differential protection method based on phasor sets includes the following steps:

[0024] 1) Calculate the phasors of the current sampling point and the first n sampling points to form a set of sampling currents corresponding to each branc...

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Abstract

The invention relates to a differential protection method based on a phasor set. A disadvantage that the current differential protection depends on the strict synchronization of sampling values is changed to a large extent. Phasors of multiple times in a cross-step time window are employed to form a phasor set. Since a phasor which satisfies a differential protection synchronization requirement certainly exists in the phasor set, the differential protection is completed according to differential current and breaking current which are obtained through phasor set operation, thus when the sampling values are synchronous or out of synchronism in a certain degree, a purpose that the differential protection can be put into use continuously and both the sensitivity and reliability are not affected is realized.

Description

technical field [0001] The invention relates to a differential protection method. Background technique [0002] The sampling value data (SV) between the process layer devices of the smart substation adopts the DL / T860.92 (IEC61850-9-2, hereinafter referred to as the 9-2 mode) protocol point-to-point or network transmission mode, although the network transmission mode conforms to The development direction of smart substation networking, multi-interval information sharing, and simplified process layer network structure, etc., but the synchronization of SVs in different intervals depends on the time synchronization system. [0003] The technical requirement for the protection device is: it does not depend on the external timing system to realize its protection function. Substation network transmission SVs are mostly used for fault recording and network message analysis devices and station-level protection and control devices. When SVs are obtained by using the 9-2 network tran...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H3/26
Inventor 孟乐刘星李俊刚许云龙马仪成游建军韩宇吴水兰魏勇
Owner XUJI GRP