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Distribution network fault line selection method based on transient energy difference

A distribution network fault and transient energy technology, applied in the direction of measuring electricity, fault location, measuring electrical variables, etc., can solve the problems of increased workload of distribution network operation and maintenance, increase of distribution network, etc., to improve line selection protection Margin, line selection principle is simple, the effect of high accuracy

Active Publication Date: 2017-08-18
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The number and scale of lines in the distribution network are increasing day by day, which adds a lot of workload to the operation and maintenance of the distribution network.

Method used

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  • Distribution network fault line selection method based on transient energy difference
  • Distribution network fault line selection method based on transient energy difference
  • Distribution network fault line selection method based on transient energy difference

Examples

Experimental program
Comparison scheme
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Embodiment 1

[0026] Embodiment 1: A distribution network fault line selection method based on transient energy difference, a distribution network simulation model is built according to the actual operation of the distribution network, and different lines and phase-specific grounding faults are set in the simulation model, and the distribution network is obtained. Each line of the power grid generates a corresponding transient zero-sequence current signal i 0i (t) and bus zero-sequence voltage signal u 0 (t); Select the zero-sequence current i within 5ms after the fault 0i (t) and zero sequence voltage u 0 (t), and then according to the zero-sequence energy function W i (t), to obtain the transient energy W of each line within 5ms after the fault i , and then obtain the average transient energy of the line Using transient energy W i and transient energy mean Construct line selection function Ei fault ,when When , line i is a non-faulty line; when Line i is the faulty line.

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Embodiment 2

[0045] Embodiment 2: Other parts of this embodiment are the same as Embodiment 1, as figure 1 As shown, the simulation model of 110kV / 35kV distribution network is as follows figure 1 As shown, it has 6 feeders, and the neutral point of the Z-shaped transformer is grounded through the series resistance of the arc suppression coil. Overhead feeder L 1 =18km, L 3 =30km, L 5 = 15km, wire-cable hybrid feeder L 4 =14km, the overhead feeder is 12km, the cable is 2km, and the cable feeder is L 2 = 7km, L 6 = 9 km. G in the power grid is an infinite power source; T is the main transformer, the transformation ratio is 110kV / 35kV, and the connection group is Y N / d11;T Z Is a zigzag transformer; L is the arc suppression coil; R is the damping resistance of the arc suppression coil. The feeder adopts three types of lines: overhead line, overhead line-cable hybrid line and cable line. The load uses a constant power load model. Feeder L 1 A single-phase ground fault occurs in ph...

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Abstract

The invention relates to a distribution network fault line selection method based on a transient energy difference, which belongs to the technical field of fault line selection in a power system. According to the actual operation of the distribution network, a distribution network simulation model is built, different lines and phases of grounding fault are set in the simulation model, and corresponding transient component zero sequence current and bus zero sequence voltage signals generated under grounding fault of each line of the distribution network are obtained. Zero sequence current and zero sequence voltage of each feeder line within 5 ms after fault are selected, transient energy of each line within 5 ms after fault and a transient energy mean value are solved, a line selection function is built by using the transient energy and the transient energy mean value, and when a line selection function value of a certain line is larger than the transient energy mean value, the line is a line without fault; and when a line selection function value of a certain line is equal to the transient energy mean value, the line is a line with fault.

Description

technical field [0001] The invention relates to a fault line selection method of a distribution network based on a transient energy difference, and belongs to the technical field of power system fault line selection. Background technique [0002] The number and scale of distribution network lines are increasing day by day, which adds a lot of workload to the operation and maintenance of distribution network. The ground fault is a common and difficult type of fault in the distribution network. When a single-phase ground fault occurs in the distribution network whose neutral point is grounded through the arc suppression coil, the three-phase line voltage of the power grid always maintains symmetry. The compensation function of the coil produces a small fault current. According to the power system operating regulations, the system can continue to run for 1-2h with a fault in this case, without tripping immediately, and maintaining the continuity of power supply to the load. At...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/08
CPCG01R31/086G01R31/088
Inventor 束洪春王书领曹璞璘沐润志陈诺
Owner KUNMING UNIV OF SCI & TECH