TYPES OF SUBSTATION BUS SCHEMES BASIC INFORMATION AND TUTORIALS



Various factors affect the reliability of a substation or switchyard, one of which is the arrangement of the buses and switching devices. In addition to reliability, arrangement of the buses/switching devices will impact maintenance, protection, initial substation development, and cost.

The substation design or scheme selected determines the electrical and physical arrangement of the switching equipment.

Different bus schemes can be selected as emphasis is shifted between the factors of safety, reliability, economy, and simplicity dictated by the function and importance of the substation.

Some of these schemes may be modified by the addition of bus-tie breakers, bus sectionalizing devices, breaker bypass facilities, and extra transfer buses.

The substation bus schemes used most often are found below:

1. Single bus
2. Main and transfer bus
3. Double bus, single breaker
4. Double bus, double breaker
5. Ring bus
6. Breaker and a half

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