Fault phase determining method of arc extinguishing cabinet based on transient high-frequency component

A technology of high frequency component and fundamental frequency component, applied in the fault location, measuring electricity, measuring device and other directions, can solve the problems of low accuracy, inability to accurately judge the faulty phase, and power system hazards.

Active Publication Date: 2018-06-08
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The accuracy of this method using a single criterion is low, and the single arc grounding is mostly intermittent arc grounding, that is, the arc is generated and extinguished regularly in units of cycles,

Method used

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  • Fault phase determining method of arc extinguishing cabinet based on transient high-frequency component
  • Fault phase determining method of arc extinguishing cabinet based on transient high-frequency component
  • Fault phase determining method of arc extinguishing cabinet based on transient high-frequency component

Examples

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example 1

[0056] Example 1: if figure 2 As shown, the distribution network has A-phase intermittent arc-ground faults in the L4 branch. , using a method for judging a fault phase of an arc suppression cabinet based on a transient high-frequency component disclosed by the present invention, including the following steps, see figure 1 :

[0057] Step 1: The on-site oscilloscope records the instantaneous value data of the three-phase voltage of the bus when the arc burns, and the recorded data is as follows: image 3 As shown, the intermittent arc ground fault, the first arc burning and extinguishing time are 0.1s and 0.11s respectively.

[0058] Step 2: Calculate the effective values ​​of the bus three-phase voltage data respectively. Taking half a cycle (0.01 second) as the unit time, the effective value is the root mean square value of the instantaneous value collected in step 1 within a unit time:

[0059]

[0060] Select the data of the first 0.01 second (0.1s ~ 0.11s) at the ...

example 2

[0066] Example 2: if figure 2 As shown, the distribution network has A-phase intermittent arc-ground faults in the L4 branch. , using a method for judging a fault phase of an arc suppression cabinet based on a transient high-frequency component disclosed by the present invention, including the following steps, see figure 1 :

[0067] Step 1: The on-site oscilloscope records the instantaneous value data of the three-phase voltage of the bus after the arc is extinguished, and the recorded data is as follows: image 3 shown. The specific data is from the first arc extinguishing time of 0.11s to the second arc burning time of 0.12s.

[0068] Step 2: Use Fourier transform to decompose the three-phase voltage recorded in step 1, and decompose it into three groups of multiple voltage components with different frequencies, and extract the components with frequencies ranging from 49 to 51HZ, which are called system frequency components, also known as The fundamental frequency comp...

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Abstract

The invention discloses a fault phase determining method of an arc extinguishing cabinet based on a transient high-frequency component. A traditional fault phase determining method of the arc extinguishing cabinet based on a single criterion, that the effective voltage value of the fault phase approaches 0 after a single-phase arc grounding fault, is low in accuracy causes cases of fault phase determining errors onsite, and threatens the reliability of the power system. According to the fault phase determining method of the invention, the criterion that the high-frequency component phase of the fault phase after arc extinguishing is opposite to the high-frequency component phase of a non-fault phase is used, and the criteria that the effective value of the fault phase is reduced before arcextinguishing and a high frequency component only exists in the fault phase are also used, so that the fault phase can be determined accurately and rapidly.

Description

[0001] Patent field [0002] The invention belongs to the field of relay protection of electric power system, relates to the judgment of the fault phase of the arc suppression cabinet, in particular to the judgment method of the fault phase of the arc suppression cabinet based on the transient high frequency component. Background technique [0003] With the continuous increase of power system scale, the reliability of distribution network plays an increasingly important role in the national economy. The distribution network is a link directly facing users, which is related to the production and life of power users, and its importance is self-evident. In distribution network faults, single-phase ground faults occupy a dominant position, and single-phase arc-ground faults account for the vast majority of single-phase ground faults. Each year, single-phase ground faults cause a certain amount of potential safety hazards to the power system, reducing the The reliability of the po...

Claims

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Application Information

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IPC IPC(8): G01R31/08
CPCG01R31/088
Inventor 齐郑郑宇航庄舒仪薛融
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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