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
No comments:
Post a Comment