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A distance protection method based on distributed parameter model

A distributed parameter model and distance protection technology, applied to emergency protection circuit devices, electrical components, etc., can solve problems such as distributed capacitive current and harmonic effects, and achieve the effects of small calculation, high reliability, and low sampling rate requirements

Inactive Publication Date: 2008-08-13
XIAN XIRUI CONTROL TECH CO LTD +1
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Problems solved by technology

[0007] The purpose of the present invention is to provide a distance protection method based on a distributed parameter model to overcome the existing distance protection problems affected by distributed capacitive current and harmonics

Method used

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  • A distance protection method based on distributed parameter model
  • A distance protection method based on distributed parameter model
  • A distance protection method based on distributed parameter model

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Embodiment Construction

[0016] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0017] The concrete steps of this method are:

[0018] For a transmission line with distributed parameters, assuming that the positive direction of the current is shown in Figure 1, it can be deduced from the differential equation describing the wave process of the transmission line, the voltage and current at a distance l from the end m of the line are respectively

[0019] u ( l , t ) = 1 2 [ u m ( t - l v ) + Z c i m ( t - l v ...

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Abstract

The invention relates to the relay protection field of electric transmission line of electric power system, in particular to a distance protection method based on the distributed parameter model. The invention is aimed to solve the problem that the current distance protection is affected by distributed capacitance current and harmonic. The invention uses the voltage and current in the protection mounting place to compensate the end of the section I of the distance according to the distributed parameter model, and simplifies the line between the end of the section I and the fault point into a R-L model. That weather the fault is at inside or outside can be determined by solving differential equation. The invention has the advantages that: comparing to the distance protection based on the R-L model of the electric transmission line, the invention avoids the affect of distributed capacitance current and harmonic; comparing to the distance protection based on the pi model of the electric transmission line, the invention has higher reliability on fault determine; comparing to the distance protection based on the Bergeron model of the electric transmission line, the invention has the advantages of low requirement on sampling rate, low amount of calculation, low requirement on the hardware for the distance protection apparatus.

Description

Technical field: [0001] The invention relates to the field of relay protection for power system transmission lines, in particular to a distance protection method based on a distributed parameter model. Background technique: [0002] As a basic component of line protection, distance protection plays a vital role in the safe and stable operation of the power system. With the expansion of power system scale, high-voltage long-distance transmission lines are increasing, and the requirements for distance protection are also getting higher and higher. [0003] At present, the computer distance protection adopts a simplified parameter model (R-L model), which can only be used for relatively short lines. For UHV long-distance transmission lines, distributed capacitive currents and harmonics in the fault process have a great influence on the accurate calculation of distance protection, which may easily cause transient overriding of distance protection. In order to speed up the prot...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/26
Inventor 索南加乐顾嘉贠保记
Owner XIAN XIRUI CONTROL TECH CO LTD
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