Method for evaluating reliability of digital transformer substation relay protection system

A relay protection and reliability technology, applied in the direction of electrical digital data processing, special data processing applications, instruments, etc., can solve problems such as packet loss, unreliability, and complex structure

Inactive Publication Date: 2014-12-17
STATE GRID CORP OF CHINA +1
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  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

(2) Complex structure
Digital substation communicates in a message-based network communication mode, and there will always be unreliable factors, such as packet loss or network storms, which are not allowed in the relay protection system

Method used

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  • Method for evaluating reliability of digital transformer substation relay protection system
  • Method for evaluating reliability of digital transformer substation relay protection system
  • Method for evaluating reliability of digital transformer substation relay protection system

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Embodiment Construction

[0058] The technical solutions of the present invention will be further described below in conjunction with the accompanying drawings and specific implementation methods through examples.

[0059] The structural block diagram of a 220kV digital substation relay protection system is as follows: Figure 8 shown. The system adopts the IRIG-B code time synchronization form, the time synchronization network is a star structure, MI1 is a current transformer, MI2 is a voltage transformer, TS is a synchronous clock source, MU1 and MU2 are merging units, SW1-4 are switches, PR1 and PR2 are protection units, IT1 and IT2 are intelligent terminals, and BR is a circuit breaker. The merging unit, protection unit and intelligent terminal are all dual configurations, the SV sampling value transmission protocol is IEC61850-9-2, the switch network adopts the form of independent dual networks, and the GOOSE loop adopts the form of direct connection. Figure 8 The numbers 1-24 in represent the ...

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Abstract

The invention provides a method for evaluating the reliability of a digital transformer substation relay protection system. According to the method, a model for analyzing the reliability of the digital transformer substation relay protection system is built by using information stream of a protection function as a study object and using the pattern modeling and reliability diagram analysis principle as the basis according to the composition and the characteristics of digital relay protection, and in addition, the example calculation is used as a concrete implementation mode. According to the reliability analysis method provided by the invention, the analysis and the calculation are carried out by using the known element reliability of elements for forming the relay protection system as the basis, the result can be used for evaluating the reliability of systems adopting different structures, so a more proper system composition mode is selected out, and the method can be used for early-stage planning of a digital transformer substation. A reliability modeling and calculation method provided by the method disclosed by the invention is more visual, the thinking is clear, and a reliability calculation model can be directly abstracted out directly through topological graphs of the digital transformer substation.

Description

technical field [0001] The invention relates to a method for evaluating the reliability of a digital substation relay protection system, and belongs to the technical field of substation relay protection systems. Background technique [0002] In the 1980s, reliability analysis began to be applied to the power system, and gradually expanded from the initial planning reliability analysis to all aspects of the power system. In the relay protection system, indicators such as correct action rate, mean time between failures (MTBF), and average life (MTTF) were used as reliability evaluation indicators at first, but these indicators can only be used to determine the reliability of the system through previous data It is impossible to predict and estimate the possible reliability of a system, and its application in guiding the construction of relay protection systems has certain limitations. [0003] At present, in terms of protection reliability evaluation modeling and index solutio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F19/00
Inventor 郭亮孙旻熊华强荣彩霞王文彬
Owner STATE GRID CORP OF CHINA
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