Intelligent protection system of distribution network

An intelligent protection and distribution network technology, applied in the direction of emergency protection circuit devices, electrical components, etc., can solve the problems of long isolation fault time, tripping, and fixed value coordination, so as to improve the reliability of power supply, ensure safe operation, and reduce the number of lines Effect of fault outage range

Active Publication Date: 2014-10-22
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] 3. The tripping and isolation fault time of the section switch protection action is long, and the general action time is ≥100 milliseconds. When the number of section switches is ≥2, it cannot cooperate with the fixed value of the quick-break protection time of the outlet switch in the substation to realize the selectivity of the protection action. When the line is faulty, there may be a phenomenon that both the outlet switch and the section switch in the substation are protected and tripped

Method used

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  • Intelligent protection system of distribution network

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Embodiment 1

[0022] In this implementation, the distribution network intelligent protection system is as follows: figure 1 As shown, it includes substation bus 1, line outlet switch 2, distribution line 3, section switch 4 (1#, 2#, 3#), large branch switch 5, distribution network automation system platform 6, optical fiber network 7 and intelligent Protective terminals (FTU) 8 (1#, 2#, 3#, 4#), section switches 4 (1#, 2#, 3#) are set on the distribution line 3, and large branch switches 5 are set on the branch lines Above, segment switch 4 (1#, 2#, 3#) and large branch switch 5 correspond to intelligent protection terminal (FTU) 8 (1#, 2#, 3#, 4#) respectively, segment switch 4 (1 #, 2#, 3#) and the large branch switch 5 have the same current speed breaking value, and the current speed breaking protection setting value is that when a two-phase short circuit fault occurs in the minimum operation mode at the section switch installation place, the protection device can operate reliably.

[0...

Embodiment 2

[0026] Such as figure 2As shown, in this embodiment, the smart distribution network adopts ring network lines, and its protection system includes substation busbar 1 (1#, 2#), line outlet switch 2 (1#, 2#), distribution line 3, segment Switch 4 (1#, 2#, 3#, 4#), contact switch 5, distribution network automation system platform 6, optical fiber network 7, intelligent protection terminal (FTU) 8 (1#, 2#, 3#, 4# ) and intelligent protection terminal 9, intelligent protection terminal (FTU) 8 (1#, 2#, 3#, 4#) are respectively installed in the section switch 4 (1#, 2#, 3#, 4#), intelligent The protection terminal 9 is installed in the tie switch 5, and each intelligent protection terminal is used to collect the information of the corresponding switch. (3#, 4#) are set on the distribution line 3 of the 2# busbar of the substation, the contact switch 5 is set at the connection between the distribution line of the 1# substation busbar and the distribution line of the 2# substation b...

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Abstract

The invention, which belongs to the technical field of automation of the distribution network, relates to an intelligent protection system of distribution network. According to the invention, the system comprises at least two section switches installed at a distribution line and matched intelligent protection terminals, a communication system and a distribution network automation system platform. According to the system, non-level different current protection is used; and thus the current protection tripping time setting values of all section switches are identical. The intelligent protection terminals identify the supervisor-subordinate relation of all intelligent protection terminals according to a network topological relation file. When a fault occurs at the distribution line, tripping of the corresponding section switch is carried out, the faulty line section is isolated, and the non-fault line section carries out operation continuously; and power supplying of the non-fault section behind the fault point is recovered by a connecting switch of another distribution line. Therefore, the line fault power-failure range can be reduced; power supply reliability of the distribution network is improved; and secure operation of the power system is guaranteed.

Description

technical field [0001] The invention relates to an intelligent protection system for a distribution network, which belongs to the technical field of distribution network automation. Background technique [0002] With the development of the times and the improvement of living standards, users have higher and higher requirements for power supply quality and reliability. Distribution network automation is a new technology for power applications in recent years, mainly involving medium and low voltage power grids. At present, all countries in the world are very concerned about this and are constantly exploring. In recent years, many regions in my country have carried out pilot work on distribution network automation at different levels and scales. The current schemes are mainly divided into Japanese and European. The fault isolation mode of the distribution line is current type or voltage type. When a fault occurs, the protection switching action of the substation trips, and the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/26
Inventor 杨明乾姜俊莉张明王勇焕秦文杰时振堂黄长明李林卿
Owner CHINA PETROLEUM & CHEM CORP
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