New phase-segregated digital busbar protection solutions

This paper focuses on the new phase-segregated solution. A general overview of busbar protection principles is given starting from simple interlocking schemes for single-incomer distribution busbars, to high-end microprocessor based protection schemes. Also, a novel phase segregated approach based on existing hardware platforms capable of processing plurality of single-phase AC input signals is presented. The new solution is discussed in details including architecture, reliability, dependability, speed of operation, security on external faults, case of configuration and cost. Lastly, the basic application principles for protection of complex busbars are presented. They include a tie-breaker with a single CT, treatment of blind zones and overtripping zones, dynamic bus replica, end fault protection and breaker failure protection. Both principles and examples are presented.