CONCLUSION
The previous discussions have detailed the bus characteristics during transfer and the types of relays that can be used to provide reliable transfer. the transfer logic controller provides a solution to the overall bus transfer problem by incorporating the following features in one relay package.
1. trip and close control of unit auxiliary and startup source breakers.
2. direct control of each type of transfer regardless of bus conditions.
3. automatic selection of the proper transfer type (Fast, in phase and residual voltage) depending on bus conditions.
4. three transfer initiation modes:
a) manual transfer initiate
b) protective relay transfer initiate
c) automatic transfer initiate

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