Greetings to all.
Electrical distribution of my facility has a main 5MVA 38kV - 8.32kV transformer. From this transformer, four (4) transformers are connected stepping down from 8.32kv - 480V/277V. The capacities of these transformers are 750KVA, 750KVA, 1500KVA and 1500KVA. Then, from each transformer, switchgears are connected. Switchgears consist each of a main entrance, transfer switch and distribution panel.
I want to connect a 600kw 480V/277V cogeneration to one of the 1500KVA8.32kV ? 480V/277V transformer. The switchgear of this transformer consists of a main 1600A entrance, a transfer switch for a 1250KVA generator and a distribution panel with 1600A bus bars.
Possible connections that I can think of are
1) Grid connected directly to 1600A distribution panel bus bars. Using a monitoring meter to avoid back feed to POCO and avoid using the 480V/277V transformer as step up transformer. One drawback is that at some instances if existing loads are lower than 600kw then cogeneration need to be turned off.
2) Grid connected using a step up transformer 480V ? 8.32kV and connection to the facility 8.32kV distribution.
Any suggestions?
Electrical distribution of my facility has a main 5MVA 38kV - 8.32kV transformer. From this transformer, four (4) transformers are connected stepping down from 8.32kv - 480V/277V. The capacities of these transformers are 750KVA, 750KVA, 1500KVA and 1500KVA. Then, from each transformer, switchgears are connected. Switchgears consist each of a main entrance, transfer switch and distribution panel.
I want to connect a 600kw 480V/277V cogeneration to one of the 1500KVA8.32kV ? 480V/277V transformer. The switchgear of this transformer consists of a main 1600A entrance, a transfer switch for a 1250KVA generator and a distribution panel with 1600A bus bars.
Possible connections that I can think of are
1) Grid connected directly to 1600A distribution panel bus bars. Using a monitoring meter to avoid back feed to POCO and avoid using the 480V/277V transformer as step up transformer. One drawback is that at some instances if existing loads are lower than 600kw then cogeneration need to be turned off.
2) Grid connected using a step up transformer 480V ? 8.32kV and connection to the facility 8.32kV distribution.
Any suggestions?