Application of Admittance-Based Relaying Scheme Under Dynamic Shunt Compensation

Abstract

With abrupt change in reactive power, demand in the system may lead to unhealthy voltage profile. To maintain the flat-voltage profile, static var compensators (SVCs) are mainly used. SVC controls voltage level by regulating the reactive power in the system. Introduction of SVC in the grid may lead to mal-operation of conventional relaying schemes for transmission line (TL) protection due to dynamic impedance variation of SVC during faulty condition. An existing differential admittance-based method is discussed and its application under the dynamic shunt compensation is obtained in this paper for different types of fault with different fault locations, inception angles, evolving fault, cross-country fault, and high resistance fault cases.