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Fault line parameter calculation method based on single-phase ground fault record data

A technology for single-phase ground faults and fault lines, applied to fault locations, measuring devices, instruments, etc., can solve problems such as obtaining fault line parameters, achieve effective calculations and avoid errors

Active Publication Date: 2018-05-18
南京首风智慧电力研究院有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0011] The purpose of the present invention is to provide a fault line parameter calculation method based on single-phase ground fault recording data, which solves the problem of obtaining fault line parameters

Method used

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  • Fault line parameter calculation method based on single-phase ground fault record data
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  • Fault line parameter calculation method based on single-phase ground fault record data

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Embodiment

[0099] Assuming that a phase-to-ground fault occurs on the transmission line, use the voltage and current sampling values ​​on both sides of the line to calculate the line-mode voltage and current u between BC phases mbc , u nbc i mbc i nbc ; Establish the π-type equivalent circuit of the line model between BC phases; write the differential equation of the line model equivalent circuit between BC phases according to the circuit law; mbc , u nbc i mbc i nbc Substitute into this differential equation; use the least squares algorithm to solve the positive sequence resistance, positive sequence inductance and positive sequence capacitance of the line. Determine the fault location by distance measuring device or manual inspection; according to the fault location, establish the zero-mode R-L equivalent circuit of the fault line; write the differential equation of the zero-mode R-L equivalent circuit according to the circuit law; m0 , u n0 i m0 i n0 Substituting this differe...

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Abstract

The invention discloses a fault line parameter calculation method based on single-phase ground fault record data. The method comprises steps that S1, fault data is acquired, a single-phase ground fault of a line MN occurs, and current and voltage sampling values on both sides of a transmission line are acquired through a fault record device or a relay protection device; S2, a low-pass filter withthe cut-off frequency of 100 Hz is utilized to filter the acquired current and voltage sampling values to remove high-frequency components; S3, the non-fault phase-to-phase line current and voltage onboth sides of the line are calculated; S4, the zero-mode current and the zero-mode voltage on both sides of the line are calculated; S5, fault line parameters are calculated. The method is advantagedin that the fault line parameter calculation problem is solved.

Description

technical field [0001] The invention belongs to the technical field of power system parameter calculation, and in particular relates to a fault line parameter calculation method based on single-phase ground fault wave recording data. Background technique [0002] Transmission line parameters are the basic data for short-circuit current calculation, relay protection setting, transient stability calculation, power flow calculation and fault location measurement in power system. If the transmission line parameter error is large, it will cause many problems. [0003] 1) The calculation error of short-circuit current is large, and the electrical equipment selected by using the result is uneconomical or easily damaged under short-circuit impact. [0004] 2) The error of the setting value of the relay protection is large, which leads to the protection overtaking action or refusal to operate. [0005] 3) The calculation conclusion of power system stability is inaccurate, which may...

Claims

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Application Information

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IPC IPC(8): G01R31/08
CPCG01R31/088
Inventor 梁振锋张晓阳张惠智
Owner 南京首风智慧电力研究院有限公司
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