2018 Georgia Tech Protective Relaying Conference

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Delayed Current Zero crossing Phenomenon During Switching of Shunt Compensated Lines

Shunt Reactors are installed in Transmission system to maintain the system voltage within permissible limits. These devices are installed either on system buses or on transmission lines with or without interrupting devices such as circuit breakers or circuit switchers. Under specific conditions, line currents during energization of lines with shunt reactors have indicated the presence of DC component resulting in delayed zero crossings (DCZ). Similar phenomenon is observed during the energization of shunt reactors on energized connected through lines. Line breaker fails to interrupt current, if called upon to open immediately following the line energization or shunt reactor energization. The paper analyses the effect of degree of compensation and point on wave switching on the DCZ phenomenon and discusses various mitigation methods. The paper also discusses protection and automatic control practices that can be employed to minimize DCZ transient effects on the equipment to successfully clear faults

Paul Nyombi
Xcel Energy
United States

Pratap Mysore
Pratap Consulting Services,LLC
United States

 

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