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A comprehensive tripping method and system for inter-station line protection based on weight distribution

A line protection and weight distribution technology, applied in the direction of emergency protection circuit devices, electrical components, etc., can solve the problems of easy malfunction and refusal of line protection between power distribution stations, and achieve the effect of increasing reliability

Active Publication Date: 2019-01-01
XUJI GRP +4
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a comprehensive tripping method and system for line protection between stations based on weight distribution, to solve the problem that line protection between distribution stations is prone to malfunction and refusal

Method used

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  • A comprehensive tripping method and system for inter-station line protection based on weight distribution
  • A comprehensive tripping method and system for inter-station line protection based on weight distribution
  • A comprehensive tripping method and system for inter-station line protection based on weight distribution

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Embodiment 1

[0033] Such as figure 1 Shown is a schematic diagram of inter-station line protection when each substation includes two current transformers, including two connected substations 1 and 2, where A and B are the current transformers on the inter-station lines, and C and D are The current transformer corresponding to the sum of all incoming currents on the back side of the bus bar, when the current transformer corresponding to a certain loop of all incoming currents is abnormal, it can be considered that C or D is abnormal.

[0034] The differential criterion between current transformers A and B is {A, B}. If any one of current transformers A or B has abnormal data, it will lead to misoperation of inter-station line protection. If the data abnormality can be identified, In order to prevent misoperation, the line protection between stations corresponding to {A, B} will be reliably blocked, but at this time line AB will rely on the backup protection, and the failure may cause the sc...

Embodiment 2

[0043] As the requirements for the reliability of distribution network power supply continue to increase, the future distribution network protection may be configured in a dual manner with reference to the main network. figure 2 The schematic diagram of the substation acquisition network with dual configuration is shown. Each set of current transformers has two secondary coils. The current information of each node in the station is collected by 1U with dual configuration. The stamped current phasor is uploaded to the protection intelligence center. The protection intelligence center will collect more redundant information, and adopt a unified time synchronization method to re-synchronize the collected current phasor data, and then implement current differential protection on the corresponding lines and busbars to achieve more Comprehensive tripping strategy for high reliability. Such as figure 2 As shown, using the four current transformers (C1, C2, A1, A2) on the bus Bus1...

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Abstract

The invention relates to the field of a power distribution network and specifically relates to an interstation line protection comprehensive tripping method and system based on weight allocation. According to the method, current information on a substation is collected; interstation line protection is formed; corresponding tripping weight values are configured for the interstation line protection; a comprehensive tripping set value is set; the sum of the tripping weight values for the interstation line protection is compared with the comprehensive tripping set value; and whether to trip or not is controlled according to a comparison result. According to the method and the system, the problem that maloperation and operation rejection are liable to occur in the interstation line protection process is solved, a fault of an interstation line can be identified relatively accurately, and the reliability of the interstation line protection is improved.

Description

technical field [0001] The invention relates to the field of distribution network protection, in particular to a weight distribution-based comprehensive tripping method for line protection between stations and a system thereof. Background technique [0002] At present, distribution network protection generally adopts protection principles based on local information, such as ladder current protection. Since there is no longitudinal channel between stations, the lines between stations do not meet the conditions for implementing differential protection criteria. Even if there is a longitudinal channel between stations, the selectivity of protection can be improved by using the longitudinal differential protection, but this protection criterion still faces the problems of abnormal data such as CT interference, saturation, and disconnection, as well as synchronization errors of current information from different terminals. These problems will lead to misoperation of the longitud...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H7/26
CPCH02H7/263
Inventor 郑灏王庆平薄志谦王林马凯琪金能
Owner XUJI GRP