A Technique for Processing Statistical Information for Elaborating Design Solutions for Protection from Sags and Short-Term Voltage Interruptions
A technique for processing statistical information on sags and short-term voltage interruptions is proposed. The technique is based on subdividing the initial totality of sags and short-term voltage interruptions recorded at an electric network node into critical and non-critical ones proceeding from the requirements of the valid regulatory documents for the noise immunity of equipment. The characteristics of each critical sag and short-term voltage interruption obtained for an electric network node are used as the initial data for calculating a number of indicators based on which a preliminary list of design solutions on limiting the influence of the considered phenomena can be drawn up. The proposed indicators have a clear physical meaning and can subsequently be used for estimating the required characteristics in generalized form, and open the possibility to carry out a preliminary technical-economic comparison of the developed preliminary versions of technical solutions. The results of approbating the proposed technique taking as an example individual points for monitoring the electric power quality in 6-220 kV networks of four regional power systems of Russia are presented.