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Adaptive regulation method of bus protection ratio brake coefficient based on bus connection current

A busbar protection and ratio braking technology, applied in emergency protection circuit devices, electrical components, etc., can solve the problems of differential criterion refusal to operate, increase of braking current, etc.

Active Publication Date: 2008-04-23
BEIJING SIFANG JIBAO AUTOMATION +1
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0007] This criterion may lead to braking current i zd Increase, if the ratio braking coefficient K is not lowered, the differential criterion may refuse to move

Method used

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  • Adaptive regulation method of bus protection ratio brake coefficient based on bus connection current
  • Adaptive regulation method of bus protection ratio brake coefficient based on bus connection current
  • Adaptive regulation method of bus protection ratio brake coefficient based on bus connection current

Examples

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Embodiment Construction

[0063] The following takes the double-bus single-section bus system as an example to illustrate the specific implementation plan, and the implementation plan of the double-bus double-section bus system is similar.

[0064] figure 2 It is a typical wiring diagram of a double-bus single-section bus system in a power system, which includes three sections of busbars and three busbars / sections, intervals I-II1,..., intervals I-IIn run on bus I or bus II, Bays III-II1, . . . , bays III-IIm run on bus III or bus II.

[0065] against figure 2 Analyze the fault situation in the I parent zone by various operation modes, and the fault analysis in the II and III parent zones is similar.

[0066] 1. Method 1

[0067] Bus coupler 1, bus coupler 2 and section (bus coupler 3) run in closed loop, the operation diagram is as follows image 3 shown.

[0068] 1) There is no switching operation, and the small difference rings of I bus, II bus and III bus are independent, and the fault analy...

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Abstract

An adaptive regulation method for a bus protection ratio braking coefficient of a microcomputer bus protection based on bus bar current includes the following steps: evaluating the bus bar circulation coefficient of a bus bar based on two bus bar currents correlated to the bus bar, regulating the previous ratio brake coefficient to get the regulated ratio brake coefficient to be used in the microcomputer bus bar protection differential criterion to increase its reliability.

Description

technical field [0001] The invention is applied to the microcomputer busbar protection of the power system. Background technique [0002] With the improvement and expansion of the grid structure of the power system, in order to ensure the stability of the system, more and more busbar systems adopt the ring busbar connection type (double-bus single-section wiring and double-bus double-section wiring). Due to the influence of the system structure, fault current may flow out when a fault occurs in the loop-closing operation of the ring bus system. Once a fault current flows out, the braking current in the differential current criterion of the busbar protection will increase. If it is not appropriate If the ratio braking coefficient is reduced, the busbar protection will refuse to operate, which will have a bad influence on the safe and stable operation of the power system. At present, the microcomputer bus protection applicable to the ring bus system adopts some adjustment met...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H7/22
Inventor 黄少峰李天华操丰梅宋小舟
Owner BEIJING SIFANG JIBAO AUTOMATION
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