A configuration method that takes into account the voltage sag characteristics of low-voltage releases

Abstract

The invention discloses a configuration method with the voltage dip character of low-voltage releasing devices taken into consideration. The configuration method comprises the following steps that an experiment scheme suitable for the voltage dip character of the low-voltage releasing devices is established; experiments are carried out on the different types of low-voltage releasing devices, and valid experiment data re acquired; voltage tolerance curves of the different types of low-voltage releasing devices are drawn based on the experiment data; approximate rectangularization processing is carried out on the voltage tolerance curves, and voltage dip character mathematical models are obtained; the voltage dip character mathematical models are clustered through a fuzzy clustering method; the appropriate low-voltage releasing devices are screened out with the tolerance ability of the voltage dip of a user side device as the basis according to the clustering result, and the configuration method is formed. According to the configuration method, it can be guaranteed that when the voltage dip accident happens, the voltage dip is in range of the tolerance ability of the voltage dip of the user side device, mistaken tripping can be avoided through the low-voltage releasing devices, the user power supplying reliability is guaranteed, the average power failure time is shortened, and the configuration method has high practicality and popularity.

Description

technical field [0001] The invention relates to the field of low-voltage release protection, in particular to a configuration method that takes into account the voltage sag characteristics of the low-voltage release. Background technique [0002] Due to its protective functions such as undervoltage and loss of voltage, low-voltage releases are currently widely used in distribution networks. In recent years, voltage sag has become the most concerned power quality issue for power supply departments and power users. When a voltage sag event occurs, within the capacity of the user-side equipment to withstand the voltage sag, the reasonable and scientific configuration of the low-voltage release can avoid false tripping, effectively reduce the average power outage time of the user, and greatly ensure the reliability of power supply Rate. Therefore, the research on the configuration method of low-voltage release has important practical significance and promotion value for ensuri...

AI Technical Summary

Problems solved by technology

There are obvious defects in adopting such a method: the voltage sag characteristics of the low-voltage release are not studied, and the ability of the user-side equipment to withstand the voltage sag is not even considered. When a voltage sag event occurs, it is very likely that there will be The risk of sudden power failure at the user side due to false tripping, resulting in huge load loss

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