1. Coaching stock

2. Manufacturing of coaching stock
Sanction (Pink book, RSP) (Nodal directorate-PU)
Issue of Particular specification including Electrical part and layout plan by RDSO
General layout
Type of shell and Bogie
Type of key materials and systems (brakes, electrics etc)
Preparation of detailed drawings by Mechanical design of PU

3. Manufacturing of coaching stock
Preparation of detailed drawings by Electrical design of PU
Issue of material schedule for procurement of materials
Setting up jigs and fixtures
Manufacturing of prototype
Tests and trials in coordination with RDSO
Issue of speed certificate by RDSO
CRS sanction

4. Head On Generation (HOG) Coaches

5. SELF GENERATION (SG) SYSTEM
SELF GENERATION (SG) SYSTEM
Generation is AC which after AC-DC rectification becomes 110
Volt DC (with battery back up) for lights & fans. For AC (RMPU)
,it gets converted into 415 V, 3 ph through Inverters.
END-ON-GENERATION (EOG) SYSTEM
750 Volt Generation from DG sets placed in power cars at the ends.
HEAD-ON-GENERATION (HOG) SYSTEM
Power Supply from OHE through LOCO Transformer

6. SELF GENERATION SYSTEMS
Axle driven under slung alternator with V - belts
110V DC regulated at different speeds through RRU
Battery back up during standing/slow movement of train
  2X25KVA, 110 V DC/415 V inverters for AC load.
110 V DC supply for lights and fans

7. MOUNTING ARRANGEMENT OF AXLE DRIVEN ALTERNATOR

8. Pulley mounted on Wheel Rectifier cum Regulator Unit
SGAC LAYOUT
Belt Pulley
25 kVA AC Coach Inverter
AC Control Panel
AC Package Unit
Pulley mounted on Wheel
3 Phase AC Alternator
Rectifier cum Regulator Unit
25 kVA AC Coach Inverter
AC Control Panel
AC Package Unit
Self Generation System
Battery
Light & fans

9. Batteries for TL & AC Alternator for TL & AC Non-AC Coaches
120 Ah- 110 V DC (nominal) , 18 Mono blocks of 6 volt each
Air Conditioned coaches
1100/800 Ah (VRLA/low maintenance)- 110 V DC: 56 cells of 2 Volt each.
Alternator for TL & AC
Non AC- 4.5 kW
AC (RMPU)- 25 kW, AC (US)- 18 kW

10. ADVANTAGES OF SG SYSTEM
  Flexibility in rake formation
Independent of mode of traction
No separate power car required 
  Failure in one coach do not affect other coach
 Feed extension is possible in emergency from adjacent
coach
    

11. DISADVANTAGES OF SG SYSTEM
Load restricted to 2X25kw per coach
Bulky 1100 Ah(AC)/ 120Ah (Non-AC) coach battery required during
standby / slow movement
  No standby alternator/battery
 Extensive maintenance due to under-slung alternator, battery,
axle-pulley
 Poor system efficiency 54%  

12. END-ON-GENERATION SYSTEM
Rajdhani, Shatabdi type fully AC trains with large power
requirements.
Two power cars each with 2X250 kW (new high Capacity )
Diesel alternator sets.
Power fed by two feeders 750V 3- ph by I V couplers step down to
415V 3 ph for AC by 50/60 kVA transformers
110V AC lighting and fans by 415/110 AC transformer

14. Advantages of EOG system
 No restriction of Load due to high capacity power cars
Does not require bulky batteries, alternators
 Standby DA sets
  Independent of mode of traction
  Less maintenance required due to elimination of under slung
alternator, battery, axle pulley etc.
Higher system efficiency

15. Disadvantages of EOG system
   Flexibility in rake formation not possible
  High cost of energy due to high fuel cost
  Noise and smoke pollution from power car
  Passenger capacity reduced due to provision of power car

16. HEAD-ON GENERATION SYSTEM (HOG)
Power supply received from loco or tapped from OHE in power car
Cost effective, reliable and energy efficient
Elimination of heavy under slung alternator in SG coaches and DA sets in EOG power car avoiding noise and smoke pollution

17. HOG SYSTEM
Single phase power from OHE through Loco/ separate Pantograph
in power car.
 Inverter (single phase to 3 phase) can be bulk mounted on/under
power car or individual coach.

20. TL & AC Maintenance

21. Maintenance schedules
Trip maintenance, under gear and safety checking
Monthly maintenance : Schedule ‘A’
Quarterly maintenance : Schedule ‘B’
IOH after 9(conventional)/18 Months (LHB) : Schedule ‘C’
Periodical Overhauling (POH) : once in 18 (conventional)/36 Months (LHB)

22. Maintenance philosophy
At present all TL items like alternators, regulators, fans, lights, battery are maintained departmentally.
Under- slung type AC Coaches all equipment like compressors, condenser, evaporator, panel are maintained departmentally.
Contract with OEM for 4-monthly schedule of inverters.
Comprehensive service contract for RMPU for Trip, monthly, 3-monthly & Periodic overhaul with RDSO approved sources.
Selective outsourcing of ACCA.

23. THANKS