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Challenges and Field Experience on Controlled Switching of EHV Circuit Breakers for Special Applications including Renewable Grid Integration Dr. Parikh Urmil1, M Sonagra ehulbhai2, Dr. Upadhyay V.J.2, Dr. Gajjar Gopal3 1ABB India Limited 2L.D. College of Engineering, India 3Pal Labs, Mumbai, India Online published on 6 February, 2020. Abstract This paper presents Challenges and Field Experience on controlled switching of EHV Circuit breakers for three special applications viz. mitigation of Ferro-resonance for transformer and capacitor combination, charging of 100% shunt compensated HV cable and energization Ungrounded Shunt Capacitor Bank for mechanically staggered gang operated circuit breaker at MV level. Also, the handling of missing zero phenomenon is well elaborated. In this context, the feasibility of attaining desired targets for various cases having various design and connection configurations have been elaborated. Furthermore, the importance of CB characteristic parameters while deciding switching targets for aforesaid equipment is elaborated. At the end, Effect of grid voltage variation on un-energized second and third poles post first pole energisation on a weak grid have been presented. Top Keywords Rate of decrease of dielectric strength, Ferro-resonance, Interphase dependency, Mechanical staggered gang operated circuit breaker. Top | |
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