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Regional power grid T line fault range-finding system based on generalized measurement

A technology of fault distance measurement and regional power grid, which is applied in radio wave measurement system, fault detection according to conductor type, satellite radio beacon positioning system, etc. It can solve the problem that current and voltage sensors are easily affected by saturation and the difficulty of installing current transformers , unable to achieve precise positioning and other problems, to achieve the effect of convenient daily maintenance, high reliability and low power consumption

Inactive Publication Date: 2017-05-10
YANTAI POWER SUPPLY COMPANY OF STATE GRID SHANDONG ELECTRIC POWER +1
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Problems solved by technology

At present, in 110kV lines and distribution networks with voltage levels below 10kV, the impedance method has been widely used in distribution automation systems, but it still cannot achieve accurate positioning, which has brought great difficulties to power grid inspection personnel. Introduce the traveling wave method based on generalized measurement into the fault location of T-connection line in 110kV regional power grid, in order to improve and solve this problem
[0004] Considering the working principle and electrical characteristics of traditional current transformers, there are many difficulties in installing current transformers in existing lines, and traditional current and voltage sensors are easily affected by saturation, making installation and maintenance complicated

Method used

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  • Regional power grid T line fault range-finding system based on generalized measurement
  • Regional power grid T line fault range-finding system based on generalized measurement
  • Regional power grid T line fault range-finding system based on generalized measurement

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Embodiment Construction

[0031] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0032] Traveling wave acquisition and ranging principle

[0033] Traveling wave ranging theory

[0034] When a fault occurs on a transmission line, the superposition principle can be used to figure 1 As shown in (a), it can be equivalently divided into non-fault state figure 1 (b) Shown and fault attached state figure 1 (c) shown.

[0035] figure 1 (b) The non-fault state refers to the normal operation state before the fault, and the equivalent voltage source U f The value is the normal voltage when there is no fault at the fault point; the additional state of the fault occurs after the fault, and is equal to the value of the voltage in the non-fault state, and the direction is opposite, and its additional equivalent voltage source is -U f . Fault-attached states are independent of non-faulted states, but are affected by how the system operates. ...

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Abstract

The invention discloses a regional power grid T line fault range-finding system based on generalized measurement, and the system employs distributed sampling terminals, a communication network, and a traveling wave range-finding analysis center. The distributed sampling terminals comprise non-contact voltage and current traveling wave collection devices disposed at poles, and each non-contact voltage and current traveling wave collection device collects an abrupt signal of a traveling wave, and uploads the abrupt signal to the traveling wave range-finding analysis center of a main station through a communication network. The traveling wave range-finding analysis center calculates the position of a fault point through employing the information uploaded by the sampling terminals, taking the time marks of two ends of a fault branch circuit as the references, combining the parameters of the fault branch circuit and employing a double-end traveling wave fault range-finding theory, thereby achieving the fault range finding of the T circuit of a power grid. The system avoids the impact on a transition resistor, is better in range-finding precision, and plays an important role in improving the power supply reliability of a regional power grid.

Description

technical field [0001] The invention relates to a generalized measurement-based T-connection line fault distance measurement system for regional power grids. Background technique [0002] In recent years, with the rapid development of social economy, the demand for electricity is increasing day by day. Especially in the summer peak hours, the load of the power grid is often close to full load operation. How to quickly restore power supply and ensure the continuity of power supply of the system is proposed for the inspection personnel of the power grid. new challenges. Therefore, when a fault occurs, quickly locate the fault location, so as to gain valuable time for the grid operation and control personnel to arrange the inspection personnel to repair the fault in time, which will have important significance for the safe and reliable power supply of the regional power grid. [0003] To quickly locate the fault location of the power grid, the traditional analysis methods are ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/08G01S19/17G01S19/42G08C17/02
CPCG01R31/086G01S19/17G01S19/42G08C17/02
Inventor 张学清卢刚刘斌陶旭嫣阎秀光王英武刘志洋田书然郝德荣韩振兴陈洪立韩日东胡国洋于慎航李欣唐王成福
Owner YANTAI POWER SUPPLY COMPANY OF STATE GRID SHANDONG ELECTRIC POWER
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