A control method suitable for switching on and off of the differential protection function of t-connected transmission lines

A transmission line and differential protection technology, applied in the direction of emergency protection circuit devices, electrical components, etc., can solve problems such as low reliability, achieve the effect of improving reliability and reducing the possibility of exit

Inactive Publication Date: 2017-05-31
STATE GRID CORP OF CHINA +2
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0009] The purpose of the present invention is to provide a control method suitable for switching on and off of the differential protection function of a T-connected transmission line to solve the problem of low reliability in the prior art

Method used

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  • A control method suitable for switching on and off of the differential protection function of t-connected transmission lines
  • A control method suitable for switching on and off of the differential protection function of t-connected transmission lines
  • A control method suitable for switching on and off of the differential protection function of t-connected transmission lines

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Embodiment Construction

[0023] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0024] One protective device is configured on each of the three sides of the three-terminal differential protection of the T-connection transmission line, and each device is equipped with two fiber channel interfaces; The channel interfaces are connected to form a three-terminal differential protection.

[0025] like figure 1 As shown, there are three protection devices—M-side protection device, N-side protection device, and S-side protection device. Each side protection device has two fiber channels CHA and CHB.

[0026] A specific method of differential throwing and withdrawing is given below:

[0027] 1) if figure 2 , each protection device is equipped with two channel pressure plates: channel A input, channel B input, respectively corresponding to two optical fiber channels. The M, S, and N three-side protection devices all send the input status of t...

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Abstract

The invention relates to a control method for switching on and off of the differential protection function of a T-joint electric transmission line and belongs to the technical field of power system relay protection. The three sides of the three-end differential protection of the T-joint electric transmission line are respectively provided with a protection device. Under the condition that the channel of the device of a certain side is abnormal and needs overhauling, or channel conditions do not exist between the devices of certain two sides, the three-end differential protection cannot be switched on, the electric transmission line will lose main protection, and the reliability of relay protection is lowered. According to the self-adaptive control method for the three-end differential protection, the switching on and off conditions of channel pressing plates of all sides can be recognized intelligently, the detail working conditions of the devices of the three sides can be extinguished, the three-end differential protection can be kept or quit selectively, the possibility that the differential main protection quits under some abnormal working conditions is lowered greatly, and the reliability of the relay protection of a power system is improved.

Description

technical field [0001] The invention relates to a control method suitable for switching on and off of the differential protection function of a T-connected transmission line. Background technique [0002] With the increase of power load density and the access of new distributed new energy sources such as wind power generation and photovoltaic power generation, more and more three-terminal power transmission systems appear in the power system. The three-terminal power transmission system adopts T-type wiring. It has the advantages of saving transmission corridors, reducing equipment investment and short construction period. At present, in the reconstruction or new substation, most of the main protection of this three-terminal transmission system adopts three-terminal differential protection. [0003] The three-terminal differential protection of the T-connection transmission line is equipped with a protection device on each of the three sides, and each device is equipped wit...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H7/26
Inventor 李文正倪传坤李旭李宝伟唐艳梅席颖颖孟利平
Owner STATE GRID CORP OF CHINA
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