Bi-directional fast bus transfer scheme for three interconnected busbars

This paper covers the logic of Fast Bus Transfer (FBT) system between three inter-connected switchboards involving three sources. At present, commonly used schemes include a two-breaker scheme and a three-breaker scheme involving maximum two electrical sources or bus-bars. However, fast bus transfer scheme can also be applied to an electrical system involving three sources or bus-bars. Such an electrical system can be adopted to achieve higher level of reliability. The commonly available FBT microprocessors can be used without greatly changing their operating modes and internal microprocessor programming (part of standard product). The focus is on the operating scheme using the existing standard FBT modules with minor modifications.