The interconnection of the following equipment’s forms a ‘Bay’
1. Line isolator with e/s and bus isolator
2. Lightning arrestor
3. Potential transformer
4. Current transformer
5. Circuit Breaker and
6. Carrier communication equipments
The following are the type of Bays
1. Incoming feeder bay
2. Outgoing feeder bay and
3. Transformer bay
The number of bays are selected based on the number of feeders incoming and outgoing and the number of transformers.
BAY is a part in a substation which starts from a bus to a feeder or vice versa. It consist of a CB i.e circuit breaker and its associated equipment likeIsolators, Current transformer, earth switches etc.
It is mainly assembly of three components:
2.circuit breaker and
various Interconnections of these three components in switchyard forms a BAY.