Standard for Fire Safety in Rapid Transit Systems - Singapore Civil ...

Diagram.4.1.3.2 - Block diagram of typical RTS station dual feeder LV power supply
Scheme
Load "A"
LV Switchroom
No. 1 Auto-close on power
(Refer to
Diagram 4.1.3.2
for Station LV
supply)
Transformer
Room No.1
NC
O
T/F
No.1
LEGEND
NO - Normally Open
NC - Normally Close
NO
Primary (normal) supply
for Load "A"
Secondary (emergency)
supply for Load "B"
interruption of any feeder
Primary (normal) supply
for Load "B"
Secondary (emergency)
supply for Load "A"
Transformer
Room No.2
Block diagram of typical RTS station dual feeder HT power supply Scheme
Station No. 1
T/F
No.1
T/F
No.2
NC NC
O
Load "B"
Standard for Fire Safety in Rapid Transit Systems 163
T/F
No.2
LV Switchroom
No. 2
Station No. 2 Station No. 3 Station No. 4 Station No. 5 Station No. 6
(End Station) (End Station)
22KV
Switchroom
No.1
66KV/22KV
T/F
Feeder No.1 Feeder No.2
Intake from utility at 66KV
66KV/22KV
T/F
22KV
Switchroom
No.2