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Distribution network fault self-healing dead zone elimination method based on feeder protection simulation principle

A distribution network fault and feeder protection technology, applied in the direction of emergency protection circuit devices, electrical components, etc., can solve problems such as feeder self-healing dead zones, and achieve the effects of improving power supply reliability, eliminating dead zones, and reducing investment

Active Publication Date: 2017-01-11
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is to propose a self-healing dead zone elimination method for distribution network faults based on the feeder protection simulation principle to solve the problem that the current information between the feeder protection equipment and the feeder terminal equipment in the substation cannot be timely, Fault self-healing dead zone problem on feeder caused by correct interaction

Method used

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  • Distribution network fault self-healing dead zone elimination method based on feeder protection simulation principle
  • Distribution network fault self-healing dead zone elimination method based on feeder protection simulation principle
  • Distribution network fault self-healing dead zone elimination method based on feeder protection simulation principle

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Effect test

Embodiment 1

[0047] Embodiment 1: as Figure 4 Shown is the "hand in hand" ring network structure simulation model diagram. Simulate the situation when a phase-to-phase short-circuit fault occurs in the dead zone. The parameters in the simulation model are as follows:

[0048] (1) Line parameters: model JKLGY-10-150 / 25, the famous values ​​of resistance and reactance are R=0.21, X=0.32, the dead zone line length is 0.3km, the length from 1# switch to 2# switch is 2.5km, and the 2# switch The line lengths to No. 3# switch and 3# switch to tie switch are both 2.5km.

[0049] (2) 10 / 0.4kV transformer parameters: capacity 1600kVA; no-load loss 1650W; load loss 14500W; short-circuit voltage 4.5%, no-load current 0.4%.

[0050] (3) Load 1 parameters: capacity 0.8MVA, power factor 0.85; load 2 parameters, load 3 parameters are the same as load 1.

[0051] (4) Circuit breaker parameters: rated voltage 12kV, rated current 630A, rated short-circuit breaking current 20kA.

[0052] (5) According t...

Embodiment 2

[0060] Embodiment 2: as Figure 4 The simulation model diagram of the hand-in-hand ring network structure is shown. Simulate the situation when a phase-to-phase short-circuit fault occurs in the upstream area of ​​the dead zone. The parameters in the simulation model are the same as above, and the simulation results are shown in the figure Figure 6 Shown:

[0061] Step 1: The first FTU of the feeder monitors the current and voltage information on the feeder in real time, and stores the collected information in the storage unit;

[0062] The second step: if Figure 6 (e) As shown in (f), no flow and no pressure will be detected on the first FTU (2#FTU) of the feeder, and 2#FTU will start and exchange information between feeder protection simulation devices.

[0063] Step 3: If Figure 6 As shown in (d), if the magnitude of the fault current and the duration of the fault current do not meet any of the fault conditions, it is judged that there is no fault on the feeder.

[...

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Abstract

The invention relates to a distribution network fault self-healing dead zone elimination method based on a feeder protection simulation principle, which belongs to the technical field of power system relay protection. After a fault happens in the dead zone, a feeder protection simulation device acquires feeder protection action information in a fault point upstream substation, the first FTU (Feeder Terminal Unit) on the feeder acquires current information at the downstream of the fault point, the current information at the upstream and the downstream of the fault point is interacted through real-time communication between the two, and the first FTU on the feeder judges whether a fault happens to the dead zone; and if the fault happens to the dead zone, the first FTU on the feeder controls the first feeder sectioned switch to be cut off, a fault section is isolated, the dead zone is eliminated, a loop FTU controls a loop switch to be closed to restore power supply in a non-fault section. By using direct interaction between the feeder protection information in the substation and the feeder terminal unit information, the dead zone is eliminated, and the feeder power supply reliability is greatly improved.

Description

technical field [0001] The invention relates to a fault self-healing dead zone elimination method of a distribution network based on a feeder protection simulation principle, and belongs to the technical field of electric power system relay protection. Background technique [0002] As the last link of the power system facing users, the distribution network realizes the automation and intelligence of the distribution network, which is very important to improve the reliability of the power supply of the distribution network and improve the user's power consumption experience. Fault self-healing is an important feature of distribution network intelligence and one of the important methods to improve the reliability of distribution network power supply. At present, there are a variety of distribution network fault self-healing technologies, among which the distribution network fault rapid self-healing technology based on distributed intelligent terminals is applied to the project...

Claims

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Application Information

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IPC IPC(8): H02H7/26
CPCH02H7/262
Inventor 董俊李文泽束洪春王书领何婕
Owner KUNMING UNIV OF SCI & TECH
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