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Distribution Network Differential Protection System and Method

A technology of differential protection and power distribution network, applied in the direction of emergency protection circuit devices, electrical components, etc., to achieve rapid positioning and removal, and ensure the effect of selectivity

Active Publication Date: 2018-12-07
YUNNAN POWER GRID CO LTD ELECTRIC POWER RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a distribution network differential protection system and method to solve the problem that the method of determining the fault point according to the fault indicator in the prior art is no longer applicable to the distribution network of a multi-power supply network

Method used

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  • Distribution Network Differential Protection System and Method

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Embodiment Construction

[0037] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0038] see figure 1 According to the first aspect of the example of the present invention, a distribution network differential protection system is provided, and the distribution network includes: a main bus 10, a slave bus 20, and a bus connected between the main bus 10 and the slave bus 20 The distribution network line 30 between, the main bus 10 is provided with a master circuit breaker 11, and the slave bus 20 is provided with a slave circuit breaker 21, and the ...

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Abstract

The invention discloses a differential protection system and method for a power distribution network. The system comprises a differential protection host, an intelligent acquisition terminal, an optical line terminal and an optical network unit. The system and the method can achieve flexible expansion of differential protection to adapt to flexible wiring and running modes of a distribution network system and adapt to flexible access of distributed energy sources, thereby ensuring selectivity, rapidness, reliability and sensitivity of distribution network protection, and achieving rapid positioning and removal of faults; and meanwhile, an passive optical network is adopted, flexible access of multiple terminals can be achieved by using one trunk optical fiber core and a plurality of branch fiber cores, a lot of optical fiber resources can be saved, and on the basis that synchronization performance and rapid and reliable transmission of SMV and GOOSE messages are ensured, MMS messages can also be transmitted, thereby achieving far-end configuration and information calling of the intelligent acquisition terminal, and achieving differential protection of the power distribution network of a multi-power network.

Description

technical field [0001] The invention relates to the technical field of electric power system relay protection, in particular to a distribution network differential protection system and method. Background technique [0002] The traditional distribution network does not consider distributed energy access, and the fault current only exists between the power source and the fault point. Usually, only directional overcurrent protection is configured at the outlet of the 10kV line in the substation. Even if an overcurrent protection device is installed for the branch line, due to the short electrical distance of the distribution network line, the overcurrent protection setting value at the 10kV outlet and the branch line cannot be distinguished, and the overcurrent protection at the 10kV outlet can only be delayed Be selective. On the other hand, when the main line fails, if the main line section circuit breaker is not installed for protection, the entire line will lose power; if...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H7/26
CPCH02H7/262
Inventor 刘柱揆曹敏胡凡君董涛许守东
Owner YUNNAN POWER GRID CO LTD ELECTRIC POWER RES INST
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