CN202435021U

CN202435021U - Automatic fault isolation system for distribution network feed line

Info

Publication number: CN202435021U
Application number: CN2011204089317U
Authority: CN
Inventors: 梁哲敏; 陈惠纲; 涂景添
Original assignee: HM POWER (GUANGDONG) CO Ltd
Current assignee: HM POWER (GUANGDONG) CO Ltd
Priority date: 2011-10-24
Filing date: 2011-10-24
Publication date: 2012-09-12
Anticipated expiration: 2021-10-24

Abstract

Provided is an automatic fault isolation system for distribution network feed lines. The automatic fault isolation system comprises a first transformer station equipped with a first outlet circuit breaker, a second transformer station equipped with a second outlet circuit breaker, and a control main station. The system is characterized in that all nodes of a backbone network connected with the first transformer station and the second transformer station are provided with ring network switching stations, and the DTU units of each two adjacent ring network switching stations are connected via a fiber. Each ring network switching station is composed of three or more than three ring network cabinet breakers which are all connected with the DTU unit. The DTU unit of each ring network switching station is connected with the control main station via a fiber, or electric carrier waves, or a GPRS or a CDMA. The ring network switching stations arranged on all nodes of the backbone network help to directly isolate short circuit fault points without trip-out and re-switching of breakers of the control main station, so that power is supplied without interruption for the purpose of no power failure, and a distribution network system is equipped with self-protection and self-healing capabilities for short circuit faults.

Description

Distribution feeder automation fault isolation system

Technical field

The utility model relates to a kind of distribution feeder automation fault isolation system.

Background technology

At present, the feed line automatization system scheme for distribution mainly realizes there are following several kinds through reclosing:

First and second reclosing scheme adopts the voltage-type on-load switch, cooperates feeder line outlet killer switch secondary reclosing, realizes the isolation in permanent fault zone.

It is simple that this traditional feeder automation pattern has equipment disposition, need not communication, the characteristics that the isolated fault success rate is high, but also have following shortcoming: (1) each fault all can cause feeder line outlet switch trip.(2) non-faulty section also can cause power failure.(3) isolated fault need feeder line go out wiretap repeatedly separating brake, close a floodgate to cooperate, cause non-fault zone repeatedly repeat have a power failure and to the repeatedly impact of system.(4) the isolated fault required time is long, the combined floodgate segmentation on-load switch of need delaying time piecemeal.(5) remote monitoring that can not realize feeder line trend, switch operating mode is controlled.

Two, single shot reclosing scheme, circuit adopts the automation on-load switch, cooperates RTU detection line fault and reports main website, cooperates feeder line outlet killer switch reclosing, realizes the isolation of fault zone.This feeder automation pattern has the function of utilizing RTU, and the backstage main website is through the reporting information to each RTU, and remote control separates the fault zone, and feeder line outlet killer switch reclosing is realized telegram in reply and Fault Isolation rapidly then.But also there is following shortcoming in this programme: (1) each fault all can cause feeder line outlet switch trip.(2) non-faulty section also can cause power failure.(3) reclosing can cause non-fault zone to be impacted.

The utility model content

The purpose of the utility model aims to provide a kind of uninterrupted power supply, and the distribution feeder automation fault isolation system that " zero " has a power failure is to overcome weak point of the prior art.

A kind of distribution feeder automation fault isolation system by this purpose design; Comprise first transformer station that is provided with the first outlet circuit breaker; Be provided with second transformer station of the second outlet circuit breaker; And controlling center, its architectural feature is that each node of the backbone network that is connected with second transformer station with first transformer station is provided with the loop networks switch station, the DTU unit at adjacent two loop networks switch stations connects through optical fiber.

Said loop networks switch station is made up of the ring main unit circuit breaker of three or above unit, and all is connected with the DTU unit.

Said first transformer station is a main electricity, and second transformer station is the stand-by power supply power supply, and during normal power supply, the second outlet circuit breaker of second transformer station keeps breaking off.

The DTU unit at said loop networks switch station is connected with controlling center through optical fiber or power carrier or GPRS or CDMA.

The utility model is through being provided with the loop networks switch station on each node of backbone network; Can directly isolate short circuit trouble point; Need not the circuit breaker trip and the coincidence of transformer station; Thereby the realization uninterrupted power supply reaches the purpose that " zero " has a power failure, and makes distribution network systems possess the self-shield and the self-healing ability of short trouble.The malfunction of adjacent DTU unit is relatively judged needs the high speed fibre passage; Along with the material conditions of the development optical-fibre communications of electrical network are ripe, and the communication of DTU unit and controlling center can be through optical fiber or power carrier or the GPRS or the CDMA etc. of technology maturation.

Description of drawings

Fig. 1 is the sketch map of the utility model one embodiment normal operating condition.

Sketch map when Fig. 2 is embodiment fault generation.

Fig. 3 is the sketch map of the state that restores electricity fast after the embodiment fault.

Embodiment

Below in conjunction with accompanying drawing and embodiment the utility model is further described.

Referring to Fig. 1; This distribution feeder automation fault isolation system; Comprise first A of transformer station that is provided with the first outlet circuit breaker 1, be provided with second B of transformer station of the second outlet circuit breaker 10, and controlling center 11; Its each node with the backbone network that first A of transformer station is connected with second B of transformer station is provided with loop networks switch station 9, and the DTU unit 8 at adjacent two loop networks switch stations 9 connects through optical fiber.First A of transformer station is a main electricity, and second B of transformer station is the stand-by power supply power supply, and during normal power supply, the second outlet circuit breaker 10 of second B of transformer station keeps breaking off.

Loop networks switch station 9 is made up of the ring main unit circuit breaker of three (or more than) unit, and all is connected with DTU unit 8.The DTU unit 8 at loop networks switch station 9 is connected with controlling center 11 through optical fiber or power carrier or GPRS or CDMA.

Loop networks switch station 9 in the present embodiment has two groups; Ring main unit circuit breaker by three unit is formed; The label that the label of three ring main unit circuit breakers at first group of loop networks switch station 9 is followed successively by three ring main unit circuit breakers at 2,3,4, the second groups of loop networks switch stations 9 is followed successively by 5,6,7.

The operation principle of the utility model is:

The first outlet circuit breaker 1 of first A of transformer station (main electricity), the time-delay that its short-circuit protection band 200ms is above.Two ring main unit circuit breakers 4 are connected DTU unit 8 respectively with ring main unit circuit breaker 5; And through the optical fiber high speed communication; If the power network line failed because between ring main unit circuit breaker 4 and the ring main unit circuit breaker 5; Ring main unit circuit breaker 4 corresponding DTU unit 8 detect short-circuit current (D=1); And ring main unit circuit breaker 5 corresponding DTU unit 8 do not detect fault current (D=0), and through high speed communication, the 8 failure judgement zone, DTU unit of ring main unit circuit breaker 4, ring main unit circuit breaker 5 is a circuit between the two; Control looped network cabinet breaker 4 is protected tripping operation (as shown in Figure 2) immediately with 5 two circuit breakers of ring main unit circuit breaker, and is whole from detecting the successful time < 150ms of fault zone isolation.Before making the first outlet circuit breaker, 1 action of first A of transformer station (main electricity); With the fault zone moment isolation between ring main unit circuit breaker 4 and the ring main unit circuit breaker 5; The power supply area of ring main unit circuit breaker 4 fronts is unaffected; Telegram in reply rapidly can be realized through remote scheduling from an other side second B of transformer station (subsequent use power supply) power supply (as shown in Figure 3) in the zone of ring main unit circuit breaker 5 back, reduces interruption duration.

Claims

1. distribution feeder automation fault isolation system; Comprise first transformer station (A) that is provided with the first outlet circuit breaker (1); Be provided with second transformer station (B) of the second outlet circuit breaker (10); And controlling center (11), each node of the backbone network that it is characterized in that being connected with second transformer station (B) with first transformer station (A) is provided with loop networks switch station (9), and the DTU unit (8) at adjacent two loop networks switch stations (9) connects through optical fiber.

2. according to the said distribution feeder automation of claim 1 fault isolation system, it is characterized in that said loop networks switch station (9) is made up of the ring main unit circuit breaker of three or above unit, and all be connected with DTU unit (8).

3. according to the said distribution feeder automation of claim 2 fault isolation system, the DTU unit (8) that it is characterized in that said loop networks switch station (9) is connected with controlling center (11) through optical fiber or power carrier or GPRS or CDMA.