Bus Duct Cooling Flashcards
1
Q
What are the Bus Duct Fan auto starts?
A
Low Flow with C/S in auto
(5” H2O decreasing)
2
Q
What cools the Bus Duct?
A
TACW
3
Q
What has to be done if both Bus Duct fans fail?
A
Bus loading must be reduced to a maximum of 10,000 amps per phase (~40% power)
4
Q
What is the Deionizing Baffle for?
A
Prevents transferring ionized air (arcing) from one phase to another (they are between the main transformer connections)
5
Q
What is the bus duct flow path for U1?
A
- Fan
- Out Middle Duct
- Supplies generator terminals, bus PT xfmrs, GSUs, and UATs
- Return in North and South ducts
- Cooler
- Fan Inlets
6
Q
What is the bus duct flow path for U2?
A
- Fan
- Out South Duct
- Supplies generator terminals, bus PT xfmrs, GSUs, and UATs
- Return in North and Middle ducts
- Cooler
- Fan Inlets
7
Q
How many Bus Duct Cooling Fans do we need to operate at 100% power?
A
1 Bus Duct Cooling fan needed for 100% operation
8
Q
At what temperature would a Unit Trip be required?
A
At the High High Limit of 105°C ( 221°F )
9
Q
What are the U1 and U2 Bus Duct Loads?
A
- Main Gen Connections
- Bus PTs
- Main Transformer Connections
- Unit Aux Transformer Connections
