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Self-synchronization longitudinal current differential protection method suitable for power transmission line

A current differential and transmission line technology, applied in the direction of emergency protection circuit devices, electrical components, etc., can solve problems such as the scope of influence, technically complex satellite equipment, and difficulty in adapting to multiplexing communication systems with elastic load variable routing, etc. Achieve the effect of high sensitivity, high transmission efficiency, simple and reliable protection method

Active Publication Date: 2017-11-17
SHANDONG UNIV
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Problems solved by technology

Among them, the sampling time adjustment method based on the data channel, the sampling data correction method and the clock correction method require the same delay in the sending and receiving process, which is difficult to adapt to the multiplexing communication system with elastic load and variable routing; the satellite-based synchronization method has high precision and wide range of services. wide, but the technology is complicated and relies too much on satellite equipment, which is easily affected by satellite working conditions and has a huge range of influence

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  • Self-synchronization longitudinal current differential protection method suitable for power transmission line
  • Self-synchronization longitudinal current differential protection method suitable for power transmission line
  • Self-synchronization longitudinal current differential protection method suitable for power transmission line

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Embodiment Construction

[0040] The present invention will be further described below in conjunction with accompanying drawing.

[0041] The invention discloses a self-synchronizing longitudinal current differential protection method suitable for transmission lines, which includes the following steps:

[0042] A self-synchronizing current differential protection method suitable for transmission lines, comprising the following steps:

[0043] (1) The relay protection devices at both ends of the protected line collect in real time and obtain the ABC three-phase current sampling sequence; the two ends of the protected line are independently sampled, and the sampling process is not required to be strictly synchronized (the time scale density can be reduced), but it should be used. A high sampling frequency is used to ensure the accuracy of the time of failure and the accuracy of data synchronization. It is recommended that the sampling frequency is not lower than 3200 Hz, and the sampling frequency used i...

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Abstract

The present invention discloses a self-synchronization longitudinal current differential protection method suitable for a power transmission line. The method includes the following steps that: fault condition detection and fault time point extraction are realized according to the fault features of the line; with the fault time points of two ends of the protected line adopted as time reference, current data are synchronized, and therefore, excellent effects can be realized in the vicinity of a zero crossing point; and according to the influence of the reflection and reflection process of traveling waves, noise interference and the like, seven consecutive sampling points are detected, and it is confirmed that a fault occurs when at least four points change suddenly, and therefore, the reliability of protection and the precision of the time point of the fault are both guaranteed. The method of the invention does not depend on synchronous clocks and does not need to adopt extra equipment; and the method fully utilizes the fault features to realize the data synchronization, thereby reducing the transmission of time information. The method has the advantages of small communication traffic, high channel utilization efficiency, and the like, and can tolerate the influence of channel delay, sampling delay and the like.

Description

technical field [0001] The invention belongs to the field of relay protection for power system transmission lines, in particular to a self-synchronizing longitudinal current differential protection method suitable for transmission lines that does not require a synchronous clock. Background technique [0002] The transmission line has a wide coverage and a large geographical span, and its operating environment is complex and its working conditions are changeable. In actual operation, faults frequently occur on the transmission line and the fault range is easy to expand, which seriously affects the safe, stable and economical operation of the entire system. Therefore, sensitive and reliable protection devices must be equipped. The longitudinal current differential protection uses the current data at both ends of the line to form a differential criterion. It has excellent operating performance and absolute selectivity. It is often used as one of the main protections for EHV and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/26
CPCH02H7/26
Inventor 高厚磊黄家凯
Owner SHANDONG UNIV
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