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Distance measuring method based on Bergeron model for power transmission line

A distance measurement method and transmission line technology, applied in the direction of measuring electricity, measuring devices, measuring electrical variables, etc., can solve the problems of difficulty in meeting the fault distance measurement requirements of UHV transmission lines, and reduce the accuracy of distance measurement and protection. Enhanced, high-precision effects

Inactive Publication Date: 2006-07-19
TIANJIN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The accuracy of distance measurement and protection is greatly reduced, and it is difficult to meet the requirements of UHV transmission line fault distance measurement

Method used

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  • Distance measuring method based on Bergeron model for power transmission line
  • Distance measuring method based on Bergeron model for power transmission line

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Embodiment Construction

[0015] The voltage and current at any point on the line can be calculated according to the voltage and current at the beginning of the transmission line using the Beryllon model. The inventor found in the study of the distance protection of UHV transmission lines using the Beryllon model that if there is no fault on the line, or if there is a fault outside the line, the line must satisfy the Beryllon model, and the calculated voltage and current must change uniformly, as shown in figure 1 shown. However, if a fault occurs on the line, the Beryllon model at the fault point is destroyed, and the corresponding phase voltage (single-phase to ground short circuit) or the corresponding phase-to-phase voltage (phase-to-phase short circuit) at this point must be equal to zero (without transition resistance) or minimum (with transition resistance) such as figure 2 shown. However, the line between the fault point and the protection installation point is still uniform, satisfying the ...

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Abstract

The invention relates to a power transmission wire fault distance-measuring and protecting method, which comprises the following steps: using phase-choosing unit to choose the fault phase when it occurs the wire fault, ascertaining the computing step-length by the wire length and accuracy, adopting Brain model to compute the step-length of the fault phase voltage or between the fault phases to obtain the voltage of each point of the wire, looking for the minimum voltage point of the wire to obtain the fault point.

Description

technical field [0001] The invention relates to the field of relay protection of power system transmission lines, in particular to a fault distance measurement and protection method for transmission lines. Background technique [0002] UHV transmission lines generally have a long distance and large distributed capacitance. The wave process when the transmission line fails makes the distance from the fault point no longer proportional to the series impedance of the line between the point and the protection installation, which destroys the conventional fault measurement. The theoretical basis of distance and distance protection. The accuracy of distance measurement and protection is greatly reduced, and it is difficult to meet the requirements of UHV transmission line fault distance measurement. [0003] The Beryllon model is an accurate model based on the electromagnetic wave propagation process on the transmission line. Guo Zheng and He Jiali introduced the Beryllon model ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/08G01R31/02
Inventor 贺家李薛士敏
Owner TIANJIN UNIV
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