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Transmission line protection method and transmission line protection device

A technology for transmission lines and protection devices, which is applied in the field of power systems and can solve problems such as easy malfunction or refusal to operate, and low reliability of protection devices.

Active Publication Date: 2016-01-13
TSINGHUA UNIV +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the limitations of hardware level and mathematical processing tools, these protection devices are less reliable in field applications, and are prone to malfunction or refusal

Method used

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  • Transmission line protection method and transmission line protection device
  • Transmission line protection method and transmission line protection device
  • Transmission line protection method and transmission line protection device

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Embodiment Construction

[0032] In order to have a clearer understanding of the above objects, features and advantages of the present invention, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that, in the case of no conflict, the embodiments of the present application and the features in the embodiments can be combined with each other.

[0033] In the following description, many specific details are set forth in order to fully understand the present invention. However, the present invention can also be implemented in other ways different from those described here. Therefore, the protection scope of the present invention is not limited by the specific details disclosed below. EXAMPLE LIMITATIONS.

[0034] figure 1 A schematic flowchart of a method for protecting a transmission line according to an embodiment of the present invention is shown.

[0035] Such as figure 1 As shown, the protection ...

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Abstract

The invention provides a transmission line protection method and a transmission line protection device. The transmission line protection method comprises the steps that three voltage equivalent travelling waves of three voltage fault transient traveling wave phasors on one end of a transmission line are constructed, and three current equivalent travelling waves of three current fault transient traveling wave phasors on one end of the transmission line are constructed; the polarity of three voltage equivalent travelling waves and the polarity of three current equivalent travelling waves are acquired; according to the polarity of three voltage equivalent travelling waves and the polarity of three current equivalent travelling waves, whether one end of the transmission line has a forward fault is determined; if the fact that one end of the transmission line has the forward fault is determined, whether the other end of the transmission line has a forward fault is determined; if the determining result is yes, the transmission line is cut off to protect the transmission line. According to the technical scheme of the invention, whether the transmission line has a line fault can be quickly detected, and appropriate measures are taken to effectively improve the protection reliability of the transmission line.

Description

technical field [0001] The invention relates to the technical field of power systems, in particular to a method for protecting a power transmission line and a protection device for a power transmission line. Background technique [0002] At present, EHV and UHV transmission lines, especially long-distance transmission distances, have obvious distribution parameter characteristics. The traditional relay protection technology based on power frequency is easily affected by the distributed capacitance of the transmission line, the saturation of the current transformer and other factors, and cannot accurately detect the fault of the transmission line. The relay protection method based on fault traveling wave principle is not affected by line distributed capacitance, system oscillation and current transformer saturation, and has broad application prospects in the protection of EHV and UHV transmission lines. [0003] As early as the 1970s, the protection idea based on the princip...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/26G01R31/00
Inventor 董新洲任立罗澍忻汤兰西唐志军邓超平林少真
Owner TSINGHUA UNIV
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