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A small-current ground fault isolation method for distribution network based on area agent

A low-current grounding and regional proxy technology, applied in electrical components, emergency protection circuit devices, etc., can solve the problems of high failure rate of communication network, short life of backup power supply, unsatisfactory operation effect, etc., to achieve wide adaptability, guarantee Quickness and selectivity, the effect of improving power supply reliability

Active Publication Date: 2019-08-27
SHANDONG UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the existing technology, power distribution automation is mainly used to realize fault location, fault isolation and power supply recovery. Power distribution automation is affected by factors such as high failure rate of communication network, short life of backup power supply, and failure to keep up with management and maintenance. The actual operation effect is not ideal.

Method used

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  • A small-current ground fault isolation method for distribution network based on area agent
  • A small-current ground fault isolation method for distribution network based on area agent
  • A small-current ground fault isolation method for distribution network based on area agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Such as figure 1 As shown, a small current ground fault isolation method of distribution network based on regional agent includes the following steps:

[0042] Step 1001, setting up regional agent terminals and dividing agent regions;

[0043] In this embodiment, taking the overhead line network as an example, in such as figure 2 The overhead line network shown has three power sources: power source T1, power source T2 and power source T3, and power outlet switches: outlet switch QS1~outlet switch QS3, outlet switch QS1~outlet switch QS3 are respectively connected to power source T1 and power source T2 And the corresponding connection of the power supply T3. Between the outlet switch QS1 and the outlet switch QS2, there are five section switches connected at one time: section switch Q1~section switch Q5, among which section switch Q3 is defined as a tie switch. Outlet switch QS3 is connected with five section switches in sequence: section switch Q12~section switch Q8...

Embodiment 2

[0072] In this embodiment, the initial state of the distribution network and figure 2 The distribution network shown is the same, assuming that the fault point K2 occurs in the agent area represented by the outlet switch QS3, specifically between the section switch Q5 and the outlet switch QS2, as shown in Figure 5 shown.

[0073] When the fault K2 occurs, the outgoing line switch QS2 judges that the transient reactive power is negative, that is, the outgoing line switch QS2 is located upstream of the fault point K2, then the outgoing line switch QS2 should be turned off, and when the configured action time is reached, the outgoing line The switch QS2 is turned off, and an instruction is issued to turn off the section switch Q5 downstream of the fault point K2, so as to realize the isolation of the fault section, such as Figure 6 shown.

[0074] Then the outgoing line switch QS2 compares the spare capacity of the tie switch Q3 and the tie switch Q10, assuming that the spa...

Embodiment 3

[0078] In this embodiment, the initial state of the distribution network and figure 2 The distribution network shown is the same, assuming that the fault point K3 occurs in the agent area represented by the outlet switch QS2, specifically between the section switch Q11 and the section switch Q12, as shown in Figure 7 shown.

[0079]When the fault K3 occurs, the outlet switch QS3 and the section switch Q12 judge that the transient reactive power is negative, that is, the outlet switch QS3 and the section switch Q12 are located upstream of the fault point K2, then the outlet switch QS2 and the section switch Q12 should be disconnected. When the configured action time is reached, the segment switch Q12 is first disconnected. After the segment switch Q12 operates, the zero-sequence voltage detected by the outlet switch QS3 disappears, and the outlet switch QS3 does not need to delay action, and the outlet After the switch QS3 receives the action information of the sub-section s...

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Abstract

The invention relates to a method for isolating a small current grounding fault of a distribution network based on an area agent, which belongs to the technical field of distribution automation. The method includes the following steps: step a, setting the proxy area and the regional proxy terminal; step b, configuring the fault action time of the switch in the proxy area; step c, judging whether a small current ground fault occurs in the distribution network; step d, located at the fault point The upstream switch delays the action; step e, realizes the isolation of the fault point; step f, determines the contact switch that needs to be operated and closes the contact switch; step g, updates the topological network of the distribution network; step h, reconfigures the agent area Fault action time of internal line switch. This small-current ground fault isolation method based on regional agents in the distribution network does not rely on communication and master station systems by setting agent areas and regional agent terminals, and only relies on local traffic to achieve small-current ground fault isolation, which has higher reliability.

Description

technical field [0001] The invention relates to a method for isolating a small current grounding fault of a distribution network based on an area agent, which belongs to the technical field of distribution automation. Background technique [0002] At present, the protection setting and configuration of distribution network relays are not perfect, especially in the small current grounding system, and there is currently a lack of reliable small current grounding fault protection and isolation methods. In the existing technology, power distribution automation is mainly used to realize fault location, fault isolation and power supply recovery. Power distribution automation is affected by factors such as high failure rate of communication network, short life of backup power supply, and failure to keep up with management and maintenance. The actual operation effect is not ideal. . Contents of the invention [0003] The technical problem to be solved by the present invention is:...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H7/28
Inventor 张新慧王敬华史建海
Owner SHANDONG UNIV OF TECH
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