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The method to prevent the optical fiber differential protection from misoperation caused by single ct saturation of 3/2 connection

A technology of differential protection and optical fiber, which is applied in the direction of automatic disconnection emergency protection devices, emergency protection circuit devices, electrical components, etc., can solve the problems of transmission line differential protection misoperation, etc., to prevent differential protection misoperation, The effect of reliable identification

Active Publication Date: 2018-04-17
XUJI GRP +3
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Problems solved by technology

[0005] The purpose of the present invention is to provide a method to prevent the misoperation of optical fiber differential protection caused by the saturation of a single CT in the 3 / 2 connection mode, so as to provide a method that can solve the problem of the saturation of a switch CT in the 3 / 2 connection mode and cause the differential protection error of the transmission line moving method

Method used

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  • The method to prevent the optical fiber differential protection from misoperation caused by single ct saturation of 3/2 connection
  • The method to prevent the optical fiber differential protection from misoperation caused by single ct saturation of 3/2 connection
  • The method to prevent the optical fiber differential protection from misoperation caused by single ct saturation of 3/2 connection

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Embodiment Construction

[0022] Attached below figure 1 , 2 , 3 The present invention is described in further detail.

[0023] The method for preventing optical fiber differential protection maloperation caused by single CT saturation in the 3 / 2 connection mode of the embodiment of the present invention is used in the optical fiber differential protection of 330kV and above voltage level ultra-high voltage and UHV transmission lines based on the 3 / 2 connection mode. 3 / 2 wiring mode transmission line wiring such as figure 1 As shown, the working process of the inside and outside discrimination module is as follows figure 2 As shown, the method of starting the starting element to determine the starting point is as follows image 3 As shown, the method includes the following steps:

[0024] (1) The line protection device is respectively connected to the current of the two switches on the 3 / 2 wiring side.

[0025] (2) Calculate the start-up currents at points k, k-1, and k-2 according to the two swi...

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Abstract

The present disclosure relates to a method for preventing a maloperation of differential protection of an optical fiber caused by saturation of a single Current Transformer (CT) of 3 / 2 connection. By applying a combination of the differential judgment and the sub-CT current judgment, reliable identification of internal and external faults is ensured, and the problem of misjudging of the internal fault as the external fault can be prevented as well.

Description

technical field [0001] The invention belongs to the technical field of electric power system relay protection, and in particular relates to a method for preventing maloperation of optical fiber differential protection caused by single CT saturation in a 3 / 2 connection mode. Background technique [0002] The relay protection device is an important part of the power system, and it plays a very important role in ensuring the safe operation of the system. When the system fails, it removes the faulty equipment and contributes to the safe operation of the system, but the incorrect action of the relay protection also causes great harm to the system. [0003] Because of its simple and reliable principle, current differential protection is widely used in the protection of high-voltage transmission lines, busbars and electrical main equipment. The basic principle of current differential protection is based on Kirchhoff's current law, and comprehensively judges whether there is a faul...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H7/22H02H7/26G01R31/08
CPCH02H3/283
Inventor 李宝伟倪传坤李文正李旭姜自强唐艳梅郝慧贞石欣赵剑松董新涛席颖颖马全霞乔彦涛唐宇孟利平
Owner XUJI GRP
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