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A Calculation Method for Fault Location of Distribution Line Using Main Oscillation Frequency

A calculation method and technology of distribution lines, applied in the field of power system, can solve problems such as instability, inability to guarantee detection reliability and sensitivity, uncertainty, etc., and achieve the effect of fast distance

Active Publication Date: 2021-08-13
SHANDONG POLYTECHNIC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] At present, in the field of power system distribution automation, there are unstable and uncertain problems in the line selection, positioning and distance measurement of single-phase ground fault detection of distribution lines, and the reliability and sensitivity of detection cannot be guaranteed.

Method used

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  • A Calculation Method for Fault Location of Distribution Line Using Main Oscillation Frequency
  • A Calculation Method for Fault Location of Distribution Line Using Main Oscillation Frequency

Examples

Experimental program
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Effect test

Embodiment 1

[0028] A calculation method for fault location of distribution lines by using the main oscillation frequency, characterized in that the steps of the calculation method are as follows:

[0029] Step 1: Obtain the main oscillation frequency of the fault f :

[0030] When a single-phase ground fault occurs, the line selection device of the substation completes the line selection function, selects the fault line, and extracts the frequency with the highest amplitude of the transient current within the range of 0.5~3KHz as the main oscillation frequency f ;

[0031] Step 2: Calculate the total equivalent inductance L ∑ , equivalent capacitance C ∑ :

[0032] L ∑ is the equivalent inductance, C ∑ is the equivalent capacitance, where the calculation formula (1) is:

[0033] (1)

[0034] In the formula (1):

[0035] L u1 is the positive sequence inductance per unit length of the distribution line, unit H / km,

[0036] l fu is the distance from the distribution line fa...

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Abstract

The invention discloses a calculation method for fault location of a distribution line by using the main oscillation frequency, which does not need to use an FTU detection device on the distribution line, but uses a single-phase ground fault in a distribution system that is not effectively grounded for the neutral point , extract the main oscillation frequency with the lowest oscillation frequency and the largest amplitude in the single-phase ground fault transient current signal, and calculate the The inductance of the distribution line, and then using the relationship between the inductance of the distribution line and the inductance per unit length, can quickly calculate the distance between the fault point and the substation.

Description

technical field [0001] The invention relates to the field of power systems, in particular to a calculation method for fault location of distribution lines by using the main oscillation frequency. Background technique [0002] The medium-voltage distribution network mostly adopts the operation mode that the neutral point is not grounded or the arc-suppression coil is grounded. For the neutral point ungrounded system, when a single-phase ground fault occurs on the distribution line, the fault steady-state current is much smaller than the load and short-circuit current, and the traditional method of fault detection (line selection, location and distance measurement) using steady-state The reliability and sensitivity of detection cannot be guaranteed due to problems such as insignificant, unstable or even uncertain faults. [0003] At present, the commonly used methods are the medium resistance method and the transient information method, using the line selection device install...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/08
CPCG01R31/085G01R31/088Y04S10/52
Inventor 刘凌林毓梁
Owner SHANDONG POLYTECHNIC