1. Auxiliary Power Supply System By CGS Gunasekara

2. Content Why auxiliary supply is needed ? Equipments supplied through auxillary. Modes of operation. Demonstration of operation

3. Why auxiliary supply is needed ? To supply power to generator/turbine and other ancillary equipments for their operation.

4. Equipments supplied by auxiliary. Common supplies Lighting system Annunciators & indicators, alarms Ventilation system (supply fans, Exhaust fans) AC system (compressures, blower fans) Battery charging system (220 V, 48 V) Drainage pumps Communication system

5. Turbine & Generator Instrumentation (metering) Protection relays Bearing oil pumps Air compressors – (to operate governor equipment – Turbine, break system) Cooling water pumps (stator coolers, bearing oil coolers) Bearing oil pumps Generator Heaters

6. General Layout Diagram

7. Modes of operation (1) From 220 KV bus through main T/F1,2,3 and through HAD3,5, or 6 (to both ESS & Non-ess sides) (2) Generators through HAD3,5 or 6 (to both ESS & Non-ess sides) (3) DG ( only to ESS side, can not extend to Non- Ess side)

8. *Voltage : 220 KV bus voltage 13.8 KV 11 KV 400 V 3 ph

9. *Voltage : generator voltage 13.8 KV 11 KV 400 V 3 ph

10. * Voltage : through DG T/F 400 V step up to 11 KV 400 V 3 ph

11. Demonstration of operation Auxiliary supply system demonstration.exe Note: To run the exe file, 1. Down load the APSS.rar file.APSS.rar 2. Unzip that file to the same folder where APSS.ppt is available. 3. Now, click above link