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Protection method and protection device of power distribution network

A protection device and distribution network technology, which is applied in the direction of automatic disconnection emergency protection device, emergency protection circuit device, circuit device, etc., can solve the problems of long power failure time and slow recovery of power supply, etc.

Inactive Publication Date: 2013-01-30
NANJING INTELLIGENT DISTRIBUTION AUTOMATION EQUIP
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

The power outage time of this method is long, and the recovery of power supply is slow

Method used

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  • Protection method and protection device of power distribution network
  • Protection method and protection device of power distribution network
  • Protection method and protection device of power distribution network

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Embodiment Construction

[0091] figure 1 It is a specific embodiment of the protection device of the present invention. The protection device is mainly composed of a transformer, a signal amplification circuit, a signal conditioning circuit (filter circuit), an A / D conversion module, an optocoupler, a communication module and a CPU. Among them, the transformer, signal amplification circuit, signal conditioning circuit (filter circuit), and A / D conversion module constitute the signal acquisition module; the CPU is mainly composed of DSP digital signal processor, MCU digital signal processor and the communication connection between the two chips. It is composed of dual-port RAM, and the MCU processor chip includes a clock chip, LED alarm and a human-computer interaction module composed of LCD screen and buttons. The DSP and MCU digital signal processors in this embodiment use TMS320F2835 and STC12LE5A60S2 respectively, the A / D conversion module uses ADS8364; the liquid crystal screen uses organic light-...

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Abstract

The invention relates to a protection method and a protection device of a power distribution network. The method comprises the following step of: arranging the protection devices used for carrying out logic control on opening and closing states on the breaker switch, linked switch and recloser of the power distribution network with phase voltages (UA, UB and UC) and phase currents (IA, IB and IC), wherein the logic control comprises voltage loss opening protection, hemi-voltage reclosing protection, current protection type voltage reclosing, latch-up separating protection, reclosing detection failure current protection, transient voltage latch-up protection, bilateral voltage latch-up closing protection, ring closing input withdrawing and hemi-voltage closing; and each protection device comprises a mutual inductor, a signal amplification circuit, a signal conditioning circuit (filtering circuit), an A / D (Analog / Digital) conversion module, an optical coupler, a communication module and a CPU (Central Processing Unit). By virtue of a plurality of creative protection logics and the corresponding protection devices, rapid fault region isolation and non-fault region power supply recovery for the power distribution network can be realized.

Description

[0001] technical field [0002] The invention relates to the technical field of distribution network relay protection, in particular to a protection method and a protection device for a distribution network. Background technique [0003] Smart grid has become an inevitable trend in the development of power grids, and all countries are vigorously developing smart grids. With the rapid development of social economy and science and technology, the society puts forward higher and higher standards and requirements for high-quality and high-reliability power supply. The State Grid Corporation clearly proposes to build an "informatization, automation, and interactive smart grid". The State Grid Corporation requires that the power supply reliability index that power supply companies should reach in the future is 99.96% in general urban areas, so that the annual The average power outage time is not more than 3.5 hours, and the central area of ​​important cities should reach 99.99%,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/26H02H3/06
Inventor 林莘郝立鹏杜仁伟李斌刘洋
Owner NANJING INTELLIGENT DISTRIBUTION AUTOMATION EQUIP
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