CN102447246A - Method of fault isolation and self-healing for electric distribution network - Google Patents

Abstract

The invention relates to a method of fault isolation and self-healing for an electric distribution network. The method comprises the following steps: 1) non-path protection which is capable of detecting and removing any position and does not need path relation is adopted on the electric distribution network; 2) a circuit breaker capable of cutting off short circuit electricity is adopted to replace the existing load switch; and 3) a spare power supply automatic input unit is arranged on the electric network. Compared with the prior art, the method provided by the invention does not only rely on a communication channel, can be used for removing a fault section selectively and rapidly, but also the power supply at a non-fault section can be recovered rapidly, and the power distribution network has a fault self-healing capability.

Description

The method of a kind of distribution network failure isolation and fault self-recovery

Technical field

The present invention relates to a kind of power distribution network, especially relate to the method for a kind of distribution network failure isolation and fault self-recovery.

Background technology

Traditional syllogic current protection and distance protection because feeder line is short, usually are difficult to obtain matching property; The direction overcurrent protection is long more operate time the closer to power end, and when the feeder line section increased, also be that user institute is unacceptable operate time; And at differential protection experience difficulties on feeder line of high-voltage fence exhibits excellent because feeder line also has many branch lines, the branch current of these branch lines be uncertain, change, it also needs passage; There is similar problem in direction comparison expression pilot protection.The no path protection that has occurred (Non-Communication Protection) is that the basis combines acceleration protection to constitute with the directional current protection; They do not need communication port; Responsiveness very fast (with respect to the direction overcurrent protection); Have good selectivity, thereby become the more satisfactory selection of feed line automatization system.

But the existing deficiency of no path protection of carrying is at present: can not excise the three-phase symmetric fault fast; Dead terminal fault detect criterion is left to be desired; Realize that this system also needs the cooperation of a switchgear.

In recent years, along with the fast development of the communication technology, feeder automation pattern-based on the feeder automation of line feed terminals unit F TU (Feeder Terminal Unit) and network service, see Fig. 1 has appearred.Under this pattern; Searching, isolate and restoring electricity of fault is to lean on FTU collection fault message and be uploaded to the control centre, and the branch closing operation of circuit breaker and on-load switch (this on-load switch also can be replaced by has the circuit breaker that cut-offs the short circuit current ability) is controlled by the control centre.This pattern has very high automatization level, and switch only needs once action, but it is too strong for the dependence of passage; Because system decision-making instruction is sent by the control centre, the time-delay of communication port in addition, the recovery time of non-fault section is also long; System reliability directly depends on the reliability of passage.In sum; There is following defective in the FEEDER AUTOMATION that has occurred: 1) usually; Except that the feeder line outlet breaker, what installed other position of feeder line all is the on-load switch that does not have cutting-off of short-circuit current capacity, therefore to be cut off be inevitable to non-fault feeder section.2) only at feeder line outlet configuration current quick, certainty moved blindly and cut off the whole piece feeder line, does not have selectivity.3) the feeder automation pattern of dependence communication port, system constitutes complicated, and reliability is low.

Summary of the invention

The object of the invention is exactly for the defective that overcomes above-mentioned prior art existence a kind of communication port that not only can not rely on to be provided; Can excise fault section selectively, fast; Can also recover non-fault section power supply apace, have the distribution network failure isolation of fault self-recovery ability and the method for fault self-recovery.

The object of the invention can be realized through following technical scheme: the method for a kind of distribution network failure isolation and fault self-recovery is characterized in that this method may further comprise the steps:

1) on power distribution network, adopts the no path protection that can detect the excision optional position, not need channel contact;

2) adopt can cutting-off of short-circuit electric current circuit breaker replace existing on-load switch;

3) stand-by power supply is set and drops into the unit automatically on electrical network.

Compared with prior art, the present invention has the following advantages:

1, can not rely on communication port, excise fault section selectively, apace, satisfy the requirement of rapidity, selectivity and the reliability of intelligent power distribution net Fault Isolation;

2, can recover non-fault section power supply apace, have the fault self-recovery ability, satisfy the requirement of power distribution network safe and stable operation, satisfy the requirement of China's intelligent power distribution net development.

Description of drawings

Fig. 1 is existing structural representation.

Fig. 2 is a structural representation of the present invention.

A is a transformer station among Fig. 1, and b is that loop networks switch, c are that control centre, CB are that circuit breaker, S are that on-load switch (or circuit breaker), L are that branch's load, FTU are that line feed terminals unit, F are the fault point.

1 is that transformer station, 2 is that stand-by power supply, CB are that circuit breaker, DNCP are that feeder line does not have path protection, F is that fault point, L are on-load switch among Fig. 2.

Embodiment

Below in conjunction with accompanying drawing and specific embodiment the present invention is elaborated.

Embodiment

As shown in Figure 2, the method for a kind of distribution network failure isolation and fault self-recovery, this method may further comprise the steps: step 1) adopts the no path protection that can detect the excision optional position, not need channel contact on power distribution network;

Step 2) adopt can cutting-off of short-circuit electric current circuit breaker replace existing on-load switch;

Step 3) is provided with stand-by power supply and drops into unit 2 automatically on electrical network.

Thereby can realize Fault Isolation and fault self-recovery between the transformer station 1.

Claims (1)

1. a distribution network failure is isolated and the method for fault self-recovery, it is characterized in that this method may further comprise the steps:

1) on power distribution network, adopts the no path protection that can detect the excision optional position, not need channel contact;

2) adopt can cutting-off of short-circuit electric current circuit breaker replace existing on-load switch;

3) stand-by power supply is set and drops into the unit automatically on electrical network.

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