A distributed element differential protection method and system

A differential protection and distributed technology, applied in the direction of automatically disconnected emergency protection devices, electrical components, emergency protection circuit devices, etc., can solve problems such as inconsistency in protection action behavior, improve power supply reliability, quickly isolate faults, step-by-step effect

Active Publication Date: 2020-01-14
XUJI GRP +2
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Problems solved by technology

[0006] The purpose of the present invention is to provide a distributed component differential protection method and system, which is used to solve the problem of inconsistency in the protection action behavior of each protection sub-unit under the distributed installation of multiple protection sub-units and the non-master configuration mode

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  • A distributed element differential protection method and system
  • A distributed element differential protection method and system
  • A distributed element differential protection method and system

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Embodiment Construction

[0026] The specific embodiment of the present invention will be further described below in conjunction with accompanying drawing:

[0027] Distributed element differential protection consists of multiple protection sub-machines cooperating to complete a complete set of protection functions. Each protection sub-machine collects partial interval analog values, and the collected analog values ​​are provided to the protection sub-machine and other protection sub-machines at the same time. , each protection sub-machine has an independent protection logic function. Due to the difference in the sampling time of the analog quantity of each protection sub-machine, there is a little difference in the fault current reflected by each protection sub-machine after filtering calculation and in the case of complex faults. , and then affect the action behavior of individual protection sub-machines in the whole system, which is manifested in the inconsistency of action behavior.

[0028] In ord...

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Abstract

The invention provides a distributed type component differential protection method and a distributed type component differential protection system. The distributed type component differential protection method comprises the following steps: judging whether other protection sub-machines except for one of the protection sub-machines act or not; if one of the protection sub-machines starts failure judgment, determining the protection judgment logic of one of the protection sub-machines according to the condition whether other protection sub-machines except for one of the protection sub-machines act or not; and if other protection sub-machines act, simplifying the action criterion of one of the protectin sub-machines, guaranteeing the protection sub-machine rapidly perform tripping outlet, guaranteeing that each protection sub-machine is far away from the failure point at the highest speed and avoids adverse influence caused by action behavior on the adjacent protection device or the safeautomatic device. The problem that the interval tripping time of the distributed type mounting and non-master configuration span-spacing component protection is inconsistent under the complex failurecondition in the area is solved, consistent step of the action behavior of each protection sub-machine under any failure is guaranteed, the failure can be isolated rapidly, and the power supply reliability is improved.

Description

technical field [0001] The invention belongs to the technical field of electric power system relay protection, and in particular relates to a distributed component differential protection method and system. Background technique [0002] At present, with the rapid development of smart substations, the innovation of relay protection technology has been strongly promoted, but some problems have also been exposed. Due to the processing delay of the merging unit and the intelligent terminal in the smart substation, the action time of the entire group of protection is close to the boundary of the system stability calculation. The relay protection of the smart substation coexists with multiple technical routes, the technical principles are not unified, the development direction is not clear, and even a breakthrough The basic principle of "four characteristics" of relay protection brings many potential risks to the operation of the power grid, and the protection technology of smart ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H7/22H02H3/26
CPCH02H3/26H02H7/22
Inventor 王智勇邓茂军李宝伟倪传坤金全仁李旭黄继东马和科李文正闫志辉郑拓夫
Owner XUJI GRP
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