title: Analysis of short-circuit stresses in power plant auxiliary systems and investigations into their reduction with consideration of selective protection
title: Ð²ÑÐ¿ÑÑÐºÐ½Ð°Ñ ÐºÐ²Ð°Ð»Ð¸ÑÐ¸ÐºÐ°ÑÐ¸Ð¾Ð½Ð½Ð°Ñ ÑÐ°Ð±Ð¾ÑÐ° Ð¼Ð°Ð³Ð¸ÑÑÑÐ°
titleType: Subtitle
Creators: name: ÐÑÑÐºÐ¾Ð²Ð°, ÐÐºÐ°ÑÐµÑÐ¸Ð½Ð°
Publisher: name: Ð¡Ð°Ð½ÐºÑ-ÐÐµÑÐµÑÐ±ÑÑÐ³ÑÐºÐ¸Ð¹ Ð¿Ð¾Ð»Ð¸ÑÐµÑÐ½Ð¸ÑÐµÑÐºÐ¸Ð¹ ÑÐ½Ð¸Ð²ÐµÑÑÐ¸ÑÐµÑ ÐÐµÑÑÐ° ÐÐµÐ»Ð¸ÐºÐ¾Ð³Ð¾
Year: 2022
Subjects: Ð¢Ð¾ÐºÐ¸ ÐºÐ¾ÑÐ¾ÑÐºÐ¾Ð³Ð¾ Ð·Ð°Ð¼ÑÐºÐ°Ð½Ð¸Ñ
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description: This work alights the problem of very high short-circuit stresses in the auxiliary system of the typical thermal power plant and investigates which options exist today for fault current limitation and what interactions exist with the selective protection. In accordance to the main problem, the following tasks were solved during the course of the study: analysis of the auxiliary system, calculation of the short-circuit stresses, research on different types of fault current limiters and its implementation in the auxiliary system via simulation a model in MATLAB/Simulink software. In carrying out the work, grading times for relays were defined, motor start-up and transformer inrush current were calculated, as well as all parameters for a three-phase symmetrical short-circuit current estimation. Based on this results the parameter blocks in MATLAB scheme were filled. After the equivalent circuit for auxiliary system was ready, the short-circuit tests were performed in order to compare results with the theoretically calculated values.Â Fault current limiting device was inserted in the MATLAB scheme lately in this work, again the short-circuit tests were performed. Resulting limited current curves were obtained as well as fault current limiter deviceâs resistance dependence on time.