Power transmission line single end fault range finding method

A fault location and transmission line technology, which is applied to the fault location, detects faults by conductor type, and measures electricity, etc., can solve the problems affecting the power supply recovery time of fault lines, low fault location accuracy, and difficulty in finding fault points. The effect of speeding up the restoration of power supply, reducing comprehensive economic losses and reducing the burden of line inspection

Inactive Publication Date: 2018-04-20
DAZHOU POWER BUREAU SICHUAN ELECTRIC POWER
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is that the existing fault location accuracy is low, which not only affects the power supply recovery time of the faulty line, but also brings a heavy burden to the line operation and maintenance personnel to check the line, especially for the case where the fault phenomenon is not obvious. The fault point is difficult to find. The purpose is to provide a single-ended fault location method for transmission lines, which can accurately calculate the short-circuit fault point when symmetrical short-circuit and asymmetrical short-circuit faults occur in different locations in the power system, and the distance measurement accuracy is high. Can accurately calculate the distance of the short-circuit point where the fault phenomenon is not obvious

Method used

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  • Power transmission line single end fault range finding method

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Embodiment 1

[0221] The present invention provides a single-end fault location method of a transmission line. The fault location method uses the sequence component method to set the voltage change of the transmission line as a quadratic function, and the known voltage, current and unit impedance of the transmission line head end Calculate the voltage of the short-circuit fault point and the distance from the short-circuit fault point to the head end. The fault location method is used for single-phase ground short circuit, two-phase ground short circuit, two-phase phase-to-phase short circuit and three-phase short circuit in a three-phase system.

[0222] (1) Under the single-phase-to-ground short-circuit situation, the single-phase-to-ground short-circuit fault model is as follows figure 1 As shown, the fault distance calculation formula is:

[0223]

[0224] in, is the phase voltage at the head end of phase A, is the phase voltage at the head end of phase B, is the phase voltage...

Embodiment 2

[0235] Based on Embodiment 1, the accuracy of simulating single-ended fault location by simulation:

[0236] (1) Establish a simulation model such as Figure 5 As shown, it includes a distributed parameter line module, a system power supply module, a three-phase circuit short-circuit fault generator element and a three-phase voltage-current detection module.

[0237] For distributed parameter line modules: the parameters R, L, and C of the line are evenly distributed along the line, and generally cannot be treated as concentrated parameter components, and some parameters are still functions of frequency. When studying short circuit and power flow, only power frequency positive sequence and zero sequence parameters are needed, which can be found in the manual or calculated. MATLAB simulation toolbox provides two kinds of mathematical models of power transmission and distribution lines, respectively is lumped parameter U type chain model and distributed parameter Bergeron mathe...

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Abstract

The invention discloses a power transmission line single end fault range finding method. According to the method, voltage change of a power transmission line is set to be a quadratic function via a sequence component method; voltage of a short circuit fault point and distance between the same and a head end can be calculated based on head end voltage, current and unit impedance of a known power transmission line; the short circuit fault point can be accurately calculated when a symmetric short circuit fault or an asymmetric short circuit fault occur at different positions in an electric powersystem, the method is high in range finding precision, and distance between short circuit points with not-too-obvious fault phenomena can be calculated accurately.

Description

technical field [0001] The invention relates to the technical field of electric power system relay protection, in particular to a single-end fault distance measurement method of a power transmission line. Background technique [0002] The power system is a power production and consumption system composed of power generation, power transformation, power transmission, power distribution and power consumption. Its function is to convert the natural primary energy into electric energy through the power generation device, and then supply the electric energy to each load center through the transmission, transformation system and distribution system, and then convert it into power, heat, light, etc. through various equipment. The form of energy serves the regional economy and people's lives. But everything has two sides, and the same is true for electric energy. If the electric energy is misoperated or the power system failure is caused by external conditions, it will pose a serio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/08G01R31/02
CPCG01R31/085G01R31/088G01R31/50
Inventor 唐金银涂向阳韦德康陈文锋冯超
Owner DAZHOU POWER BUREAU SICHUAN ELECTRIC POWER
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