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Fault starting method, system and high-voltage power transmission line relay protection system

A high-voltage transmission line, relay protection technology, applied in emergency protection circuit devices, electrical components, measuring electrical variables, etc., can solve the problems of misjudgment of interference pulses, reliability to be improved, etc.

Active Publication Date: 2017-12-15
TSINGHUA UNIV
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Problems solved by technology

At present, the fault starting method commonly used in ultra-high-speed line protection judges the occurrence of a fault by the instantaneous sampling value of the current being greater than the threshold. The action speed is extremely fast, but any interference pulse will be misjudged as a fault, so the reliability needs to be improved.

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  • Fault starting method, system and high-voltage power transmission line relay protection system
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  • Fault starting method, system and high-voltage power transmission line relay protection system

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specific Embodiment 1

[0083] This embodiment is applied to a 750 kV transmission line, and the sampled values ​​of the three-phase currents obtained by sampling are mixed with 40 dB of noise.

[0084] Such as figure 2 As shown, this embodiment includes the following steps:

[0085] Step S202, collect the three-phase current of the transmission line in real time at a sampling rate of 10 Hz (that is, collect at least one first current value at a preset interval in the first period), and obtain the three-phase current sampling value i a (n), i b (n) and i c (n), where n is a sampling sequence, then enter step S204;

[0086] Step S204, subtracting the collected three-phase current sampling value from the current sampling value 200 points ago to obtain the three-phase current mutation value Δi a (n), Δi b (n) and Δi c (n) (that is, determine the current mutation sub-value corresponding to each first current value), then enter step S206;

[0087] The calculation method of current sudden change is...

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Abstract

The present invention provides a fault starting method, a system and a high-voltage power transmission line relay protection system, wherein the fault starting method comprises: acquiring at least one first current value at preset intervals in a first period; determining the current sudden change sub-value corresponding to each current value and determining the sudden change value corresponding to the current sudden change sub-value; determining the average of the wavelet model corresponding to the sudden change value; and if the average of the wavelet model satisfies a preset formula, determining that the fault start-up is executed when the first current value time is collected. Through the technical scheme of the invention, the singularity of the signal is reflected by the integrated average of the modulus maxima, and the reaction speed can be promptly responded to various kinds of line faults. The movement speed is improved, and the accurate judgment of the no-action action is performed when the noise interference and the pulse interference are disturbed, making the system more reliable.

Description

technical field [0001] The present invention relates to the field of relay protection systems for high-voltage transmission lines, in particular to a fault start-up method, a fault start-up system, a computer device, a computer-readable storage medium, and a high-voltage transmission line relay protection system. Background technique [0002] At present, as my country gradually forms an interconnected grid pattern in which UHV transmission lines are connected to ultra-high voltage grids, a large amount of electric energy is sent from thermal power and hydropower centers in the west to load centers in the east through ultra-UHV lines. It is one of the effective measures to effectively increase transmission capacity, reduce equipment damage and enhance system transient stability by detecting and removing faults reliably and reliably. [0003] Traditional power frequency protection effectively guarantees the safe and stable operation of transmission lines, but when applied to u...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/26G01R19/175
CPCG01R19/175H02H7/26
Inventor 董新洲雷傲宇王宾
Owner TSINGHUA UNIV
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