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A Method of Improving the Accuracy of Time-limited Current Quick-break Based on Mean Value Filtering

A mean filtering and current quick-break technology, which is applied to electrical components, emergency protection circuit devices, etc., can solve problems such as time-limited quick-break protection failure, achieve the effects of improving accuracy, avoiding quick-break protection failure, and low complexity

Active Publication Date: 2022-03-04
NINGXIA KAICHEN ELECTRIC GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

As mentioned above, since the error of the true effective value based on the basis is kept at ±0.5%, taking 10A as an example, it will fluctuate between 9.95A-10.05A. If the setting value is set at 10A, because there are data, it will make the time-limited quick-break protection invalid in this case

Method used

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  • A Method of Improving the Accuracy of Time-limited Current Quick-break Based on Mean Value Filtering
  • A Method of Improving the Accuracy of Time-limited Current Quick-break Based on Mean Value Filtering
  • A Method of Improving the Accuracy of Time-limited Current Quick-break Based on Mean Value Filtering

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Embodiment 1

[0022] The present invention provides a solution to the problem that the time-limited quick-break protection fails due to precision problems in the situation described in the background art, and can achieve accurate and timely time-limited quick-break protection in this situation. Generally speaking, every time the detection is performed (generally, the period is 5ms), the value is expanded to 1.002 times the original value when judging. Once the time-limited quick-break protection is entered, the subsequent judgment is based on the average value of ten values. Calculated, such that the number of current values ​​greater than 10A is basically always greater than the number of current values ​​less than 10A. This can effectively avoid the failure of the time-limited quick-break in this case due to a value lower than 10A.

[0023] The inventive method is specifically as follows:

[0024] 1. The true effective value of the time-limited quick break is enlarged according to the ma...

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Abstract

The invention relates to a method for improving the precision of quick breaking of time-limited current based on mean filtering. Its characteristic is that it includes the following steps: (1) multiplying the true effective value of the time-limited quick-break protection, so that the true effective value is larger by 2 / 1000; (2) converting the judgment basis after entering the time-limited quick-break protection from the true effective value to True RMS data after mean filtering for every ten true RMS values. The present invention provides a method based on average value filtering to improve the precision of current quick break with delay, which solves the contradiction between precision and time when performing current quick break with delay, and effectively improves the accuracy of the judgment, and is suitable for It is used in places that require high current breaking accuracy.

Description

technical field [0001] The invention relates to a method for improving the precision of quick breaking of time-limited current based on mean filtering. Background technique [0002] The mechanism of delayed current quick break is generally used in the comprehensive protection equipment in high and low voltage complete sets of equipment (high and low voltage power distribution cabinets), which are mainly used in power systems (including power plants, substations, transmission and distribution lines and industrial and mining enterprises Users) control and protection, users can put some power equipment or lines into or out of operation according to the needs of power grid operation, and can also realize the function of quickly removing the faulty part from the power grid in time when power equipment or lines fail. The whole process includes collecting voltage and current from the high-voltage electricity through the transformer for secondary transformation ratio, calculating th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H7/26
CPCH02H7/262
Inventor 王川朱建华张衍奎谢秉旺闫亮殷宝玉杜海燕
Owner NINGXIA KAICHEN ELECTRIC GROUP