Engineering & Technologies, 2016, 9(2), 225-236 ~ ~ ~ УДК 621.3.018.782.3 Analysis of the Infl uence of Transient Process During the Shunt Reactors Commutation on Insulation of Substation “Zarya” Auxiliaries Evgenia U. Sizganova*, Roman A. Petukhov, Nikita V. Sizganov and Daria U. Nikotina Siberian Federal University 79 Svobodny, Krasnoyarsk, 660041, Russia Received 09.10.2015, received in revised form 14.12.2015, accepted 29.01.2015 The article considers the modeling and analysis of transient processes in a system of substation Zarya500 kV with different external conditions during commutation shunt reactor ROMBS-60000/500. <...> Revealed that the high-frequency overvoltageduring switching shunt reactor of 500 kV, can be dangerous for air insulation transformers TSZ-630/15. <...> Keywords: substation, shunt reactors, switching surges, auxiliary transformers, surge arresters, autotransformers, the current cutoff, replicate samples. <...> Citation: Sizganova E.U., Petukhov R.A., Sizganov N.V., Nikotina D.U., Analysis of the infl uence of transient process during the shunt reactors commutation on insulation of substation “Zarya” auxiliaries, J. Sib. <...> All rights reserved * Corresponding author E-mail address: seu_eset@mail.ru # 225 # Evgenia U. Sizganova, Roman A. Petukhov… Analysis of the Infl uence of Transient Process During the Shunt Reactors… Анализ влияния переходных процессов при коммутации шунтирующих реакторов на изоляцию оборудования собственных нужд подстанции «Заря» Е. <...> Shunt reactor (SR) is the source of reactive power for electric networks 500 kV, which is able to operate a number of functions: decrease of power loss; maintenance of reactive power under acceptable bounds; increase of transmission line throughput according to conditions’ stability; maintenance of voltage levels under acceptable bounds, described in Technical operation rules for power plants and networks of the Russian Federation Nowadays more than 270 shunt reactors for electric networks 500 kV are set at substations «FGC FEES» JSC. <...> Frequent commutations of electric SR on average, about 100 in year and even 1000 at some objects [1], cause a failure of circuit breaker, that commutate reactors. <...> High arc suppression effect in breakers during disconnection of SR may cause current section with instantaneous value 25-40 A (according to some data – 70 <...>