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Method and device for protecting lines of time blind area

A line protection and blind zone technology, applied in emergency protection circuit devices, circuit devices, electrical components, etc., can solve the problem of skipping trip risks due to lack of protection functions, and achieve the goal of eliminating skipping trip risks, ensuring power supply quality, and improving stable operation levels. Effect

Inactive Publication Date: 2016-12-07
XUJI GRP +4
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a line protection method for time blind zone, to solve the problem that there is a risk of over-level tripping due to the lack of protection function in the time blind zone of accident handling of transport inspectors

Method used

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  • Method and device for protecting lines of time blind area
  • Method and device for protecting lines of time blind area
  • Method and device for protecting lines of time blind area

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Embodiment Construction

[0017] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0018] method embodiment

[0019] In the following embodiments, a 110kV line is taken as an example for illustration. It should be pointed out that the method of the present invention is not limited to transmission lines of a specific voltage level of 110 kV, and can also be used for transmission lines of other voltage levels.

[0020] figure 1 Among them, the 110kV bus includes four components: 110kV line 1, component 2, component 3, and component 4. The protection device of 110kV line 1 is directly connected to the intelligent terminal through optical port 1, and realizes switching in and out according to the GOOSE standard for energy supply; Port 2 is directly connected to the optical port 2 of the merging unit to collect current and voltage information according to the IEC 61850-9-2 standard; it is connected to the 110kV line 1 process layer switch thro...

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Abstract

The invention relates to a method and a device for protecting lines of a time blind area. The method comprises the following steps: obtaining busbar differential protection information as well as current data of other elements and lines on busbars from a process layer network; when CT broken lines are judged, calculating the vector sum of each element and line participating busbar differential calculation to be zero, calculating the phase and amplitude of interval three-phase current; enabling the calculated phase and amplitude of the interval three-phase current to participate protection logic calculation, and outputting protection action information according to calculation results. By using the advantages, such as data transmission digitization, networking and information sharing, of an intelligent substation, data self-healing is realized in the time blind area for accident handling of operation and maintenance workers, and an override trip risk caused by protection function loss is eliminated.

Description

technical field [0001] The invention relates to the field of relay protection, in particular to a line protection method for CT or PT disconnection. Background technique [0002] At present, my country's power grid technology and equipment are constantly upgrading, promoting the development of the power grid in the direction of intensification, specialization, flattening, and unmanned advanced management. Substations below 220kV have fully promoted the unattended substation mode, which reduces the operating costs of substations. Improved operating efficiency. In terms of equipment failure handling, since the substation is unattended, there will be time blind spots for equipment to operate with failures during the period from the operation personnel at the dispatching end discovering the equipment failure information of the substation to arranging the inspection personnel to go to the substation for processing. The length of the time blind zone is related to the length of tim...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/26H02H7/22H02J13/00
CPCH02H7/22H02H7/26H02J13/0013Y02E60/00Y04S10/16Y04S10/20
Inventor 牛强李贞邱俊宏钟加勇姜帅刘永欣董新涛李栋徐瑞林张友强梁经宛陶永健李峰贾华伟李萌
Owner XUJI GRP
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