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A Calculation Method of Traveling Wave Front for Single-phase-to-ground Fault in Distribution Network

A single-phase ground fault, calculation method technology, applied in the fault location, detection of faults by conductor type, measurement of electricity and other directions, to achieve the effects of reducing environmental noise, easy operation of algorithms, and accurate positioning

Active Publication Date: 2019-04-16
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the influence of noise, it is easy to calculate multiple pseudo-traveling wave heads by directly applying the Hilbert transform, and effective denoising processing is necessary

Method used

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  • A Calculation Method of Traveling Wave Front for Single-phase-to-ground Fault in Distribution Network
  • A Calculation Method of Traveling Wave Front for Single-phase-to-ground Fault in Distribution Network
  • A Calculation Method of Traveling Wave Front for Single-phase-to-ground Fault in Distribution Network

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Embodiment Construction

[0027] The technical solutions of the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0028] Such as figure 1 As shown, the embodiment listed in this application is a single-phase ground fault distance measurement experiment in a distribution network, and the ATP-EMTP is used to build a line model for the experiment. Among them, the voltage source is designed as an ideal power supply, and the initial angle is 0 ° , to simulate a three-phase infinite power supply. The transformer connection group number is YD11, and the secondary side voltage is 10.5KV. After the transformer is a simple line MN. The line parameters per unit length are:

[0029] Positive sequence parameters: resistance R 1 =0.21Ω / km, inductance L 1 =1.2732mH / km, capacitance C to ground 1 = 0.00907 μF / km.

[0030] Zero sequence parameters: resistance R 0 =0.21Ω / km, inductance L 0 =7.0028mh / km, capacitance C to ground ...

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Abstract

The invention discloses a method of calculating the travelling wave front of a single-phase grounding fault in a distribution network. A line data collector uploads two voltage cycles before a fault and two voltage cycles after the fault, performs Karrenbauer transform on the voltage travelling wave to get a line mode voltage, performs Hilbert transform on the line mode voltage, carries out derivation, and calculates the modulus. The obtained modulus is de-noised, an effective interval is taken, and then, the arrival time of the travelling wave front is obtained. The method has the advantage of quick and accurate calculation. Through the method, the arrival time of the travelling wave front can be calculated accurately, and conditions can be created for fault location. The method has a very good application prospect.

Description

technical field [0001] The invention belongs to the technical field of power system automation, relates to fault diagnosis of a distribution network, and is a fast and accurate calculation method for a single-phase ground fault traveling wave head of a distribution network. Background technique [0002] With the development of our country's national economy, the higher people's requirements for the reliability of power supply, the higher the reliability of the distribution network operation that is closely related to residents' electricity consumption. This requires that the faults of the distribution network can be accurately identified and quickly eliminated. However, the problem of single-phase-to-ground fault location in distribution network has not been well solved for a long time. Because the distribution network generally adopts a hybrid line of overhead lines and cable lines, and the line has many branches and complex structures, it is more difficult for the distrib...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/08
CPCG01R31/086G01R31/088
Inventor 齐郑林健雄郑宇航庄舒仪
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)