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Measuring method of power transmission line failure distance

A technology of fault distance and measurement method, which is applied in the field of measurement and can solve problems such as not being able to meet the test practice well.

Active Publication Date: 2006-06-28
保定浪拜迪电气股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0011] The above methods have their own advantages and disadvantages, and cannot well meet the needs of test practice. Therefore, it is necessary to propose a new and more convenient calculation method for people to choose and use.

Method used

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  • Measuring method of power transmission line failure distance
  • Measuring method of power transmission line failure distance
  • Measuring method of power transmission line failure distance

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Embodiment Construction

[0033] figure 1 It shows that a fault has occurred at the K point of the line, and the steps of using the present invention to measure the fault point distance are:

[0034] First, select the measurement base point M on the side of the fault point K, and measure the following data at point M:

[0035] A-phase measured voltage (Uma), A-phase measured current (Ima), A-phase load current (Ifa), A-phase zero-sequence current fault component (Ima0), unit positive sequence, zero-sequence inductance, resistance (L1, L0, R1 , R0), use the above data to calculate k L =(L0-L1) / L1,k R =(R0-R1) / R1.

[0036] When the fault at point K is single-phase grounding, substitute the above data into the following formula for calculation:

[0037] ∫ 0 t 2 Umadt - L 1 * lk ...

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Abstract

A method for measuring fault distance of power transmission line measures A phase voltage Uma, current Ima, load current Ifa, zero sequence fault component ImaO, unit positive sequence, zero sequence induction and resistance at M side of fault point then substitutes above values into formula of KL = ( LO ¿C L1 ) L1 and formula of KR = ( RO ¿C R1 ) R 1 for calculating out result.

Description

technical field [0001] The invention relates to a method for measuring the distance of a fault point in an electric power grid, which belongs to the technical field of measurement. Background technique [0002] High-voltage transmission line is an important part of the power system, and its safe and stable operation is related to the safety of the entire power grid. High-voltage transmission lines are very prone to failure due to man-made and natural reasons, and are extremely difficult to find. Therefore, finding the fault point quickly and accurately after the fault can not only repair the line in time and ensure reliable power supply, but also have very important significance for the safety, stability and economic operation of the power system. [0003] The system requires both reliability and accuracy for fault location. It is hoped that the error of distance measurement should be as small as possible. For example, for high-voltage overhead lines, the absolute error of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/08G01R31/02
Inventor 连建忠
Owner 保定浪拜迪电气股份有限公司
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