Interpolation Sampled Value Protection Method
A sampling value protection, sampling value technology, applied in special data processing applications, instruments, electrical digital data processing, etc. Occasion-wide effect
Active Publication Date: 2017-04-12
NARI TECH CO LTD +1
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Problems solved by technology
[0003] The technical problem to be solved by the present invention is that the traditional sampling value protection has a large motion fuzzy area and low motion precision.
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[0040] Below in conjunction with accompanying drawing of description, the present invention will be further described.
[0041] The interpolation sampling value protection proposed by the present invention calculates the sampling value of the virtual zero-crossing point through the interpolation method, and calculates the data window t w Cumulative time t for inner sampling value greater than zero h , and then calculate the K value, by combining the K value and K iset Compare with the fixed value to judge whether the protection is active or not. The specific flow chart is as follows: figure 1 As shown, the implementation steps are as follows:
[0042] The first step is to set the settings for the interpolated sampled value protection, including a user-settable value I iset , two internal fixed values and K iset .
[0043] For a sinusoidal AC signal, its expression is formula (1):
[0044]
[0045] Where i is the instantaneous value, I is the effective value, f is th...
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The invention discloses an interpolation sampled value protection method. The interpolation sampled value protection method includes the steps of setting fixed valves for interpolation sampled value protection; discretizing and sampling an alternating current signal to obtain a sampled value sequence 0; assigning an absolute value from the sampled value sequence 0 to obtain a sampled value sequence 1; subtracting the sampled value sequence 1 by the fixed value I<iset> to obtain a sampled value sequence 2; subjecting a zero-crossing point of the sampled value sequence 2 to interpolation to obtain a virtual zero-crossing point sampled value, with which the sampled value sequence 2 form a sampled value sequence 3; acquiring t<w> data windows from the sampled value sequence 3, and calculating each accumulative time, which has a sampled value larger than zero; calculating a value K according to the t<k> and t<w>; performing protection logic judgment according to the value K, and determining protection actions. By the use of the interpolation sampled value protection method, the problems that the existing sampled value protection method has a large action fuzzy area and low precision; the interpolation sampled value protection method has the advantages of high action precision, high action speed and high reliability; the interpolation sampled value protection method is applicable to over-amount protection and under-amount protection universal to sinusoidal alternating current signals and has good application prospect.
Description
technical field [0001] The invention relates to an interpolation type sampling value protection method suitable for a microcomputer protection device, and belongs to the technical field of relay protection of electric power systems. Background technique [0002] Since the 1990s, with the popularization and use of microcomputer protection devices, the protection principles related to sampling values have been gradually studied and applied. The protection principle related to the sampling value directly uses the discrete instantaneous sampling value to form the protection criterion, which is a unique protection form of the microcomputer protection. At present, the principle of sampling value protection that is widely used is mainly sampling value differential protection. The basic principle is: take a data window of continuous R points, and use the sampling value of each sampling point to make a logical judgment. If there are S points in the data window that satisfy If the ...
Claims
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IPC IPC(8): G06F19/00
Inventor 江卫良陆源郑作伟郝后堂马营李延新
Owner NARI TECH CO LTD