Double-end traveling wave ranging method without depending on absolute time difference

A double-ended traveling wave ranging and traveling wave ranging technology, which is applied in directions such as fault locations, can solve the problems of complex mathematical processing and is not suitable for engineering applications, and achieves the effect of improving practicability and reliability.

Inactive Publication Date: 2018-11-13
NR ELECTRIC CO LTD +1
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  • Abstract
  • Description
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Problems solved by technology

The mathematical processing process of the invention is complex and not suitable for practical engineering applications

Method used

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  • Double-end traveling wave ranging method without depending on absolute time difference
  • Double-end traveling wave ranging method without depending on absolute time difference
  • Double-end traveling wave ranging method without depending on absolute time difference

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Embodiment Construction

[0028] The present invention will be further described below in conjunction with the accompanying drawings.

[0029] Such as figure 1 As shown, the two sides of line AB in the system are integrated devices for line protection and traveling wave ranging. The devices access analog quantities through CT and PT, and the devices on both sides are connected through fiber optic channels to exchange protection and traveling wave ranging information.

[0030] A two-terminal traveling wave ranging method that does not depend on time synchronization, such as figure 2 shown, including the following steps,

[0031] Step 1. The traveling wave ranging module and the line protection module are integrated in the integrated device for line protection and traveling wave ranging. The line protection module and the traveling wave ranging module respectively perform power frequency sampling and high frequency transient sampling at the same time. The protection module judges whether an internal f...

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Abstract

The invention discloses a double-end traveling wave ranging method without depending on absolute time difference. A traveling wave ranging module and a line protection module are integrated in a lineprotection and traveling wave ranging integrated device, the line protection module calculates channel delay in real time and completes absolute clock deviation calculation on the two sides, and the two-side traveling wave ranging module is used for calculating and correcting the absolute clock difference values of the fault initial traveling wave to the two sides, so that double-end traveling wave ranging without depending on absolute time difference is achieved. According to the method, time delay and absolute clock deviation of two sides are calculated by means of a line protection function, so that double-end traveling wave ranging depending on absolute time difference is achieved, the practicability and the reliability of double-end traveling wave ranging are improved, and engineeringis easy to achieve.

Description

technical field [0001] The invention relates to a double-terminal traveling wave ranging method independent of time synchronization, and belongs to the technical field of electric power system relay protection. Background technique [0002] At present, the traveling wave ranging method is a new method of fault location using current or voltage traveling waves. It is widely used due to its unique advantages such as being affected by long-term distributed capacitance. [0003] The existing traveling wave ranging method is divided into double-ended method and single-ended method. The single-ended method only needs to set a measurement point at one end, which is not limited by communication conditions. The difficulty lies in accurately distinguishing the reflected traveling waves corresponding to each traveling wave; The double-ended method uses the absolute time difference when the initial traveling wave generated by the fault arrives at the measurement points at both ends of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/08
CPCG01R31/08
Inventor 谈浩徐晓春赵青春朱晓彤李奔陆金凤陈玉林
Owner NR ELECTRIC CO LTD
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