the power supply to a train coach

1. SUMMER TRAINING
IN
SOUTH EAST CENTRAL RAILWAY
Submitted By:
Vijay Kumar Patel
Dept. of industrial &production engineering

3. 1. Self Generating (SG)
2. End-on-Generation (EOG)
3. Head-on-Generation (HOG)

4. Self Generating (SG)
2×25 kW alternators for AC coach and 1×4.5 kW for non-AC coach is mounted
underslung, driven by a pulley-belt arrangement when driving pulley is mounted on coach
axle. Output is rectified and charges 110V DC battery for continuous power supply to AC
and non-AC coaches. AC load of roof mounted packaged units is supplied by converting
DC into 2×25 kVA inverters. This system is followed over trains having a combination of AC
and non-AC coaches.

5. 110V BATTERY
WHEEL
ALTERNATOR

6. End-on-Generation (EOG)
Two power cars each equipped with 2×750 kVA DG sets, one at each end of the train, supplies 3 phase
power at 750 V AC power to each electrically interconnected air conditioned coach. The voltage is
stepped down to 3 phase 400 V and supplied to standard voltage equipment on each coach. EOG
system is followed for fully air conditioned train like Rajdhani, Shatabdi, Duranto, Garib Rath, Premium
special trains. Import of LHB class of coaches from Germany is provided with the EOG system with a
promise to provide SG system design for indigenous manufacturing. SG technology given was a
complete failure and IR is still struggling to develop designs for the last 15 years.

7. Head-on-Generation (HOG)
Power is supplied from the train locomotive at the head of the train. The single phase 25 kV transformer of
the electric locomotive is provided with hotel load winding which is converted to three phase AC at 750 V
using 2×500 kVA inverter and supplied to the same system as that of EOG. In case of Diesel Locomotive,
three phase alternator is mounted on the traction alternator and feeds the hotel load. This is the most
efficient system as the cost of power is about 25% less as compared to EOG, but the system is still under
development for the last 30 years. The other class of trains namely Electrical Multiple Unit and Main Line
Electrical Multiple Units employs the same system for coach lighting. The system is similar to what is followed
in train-set composition of train having a power unit at head as well as on tail and power the entire load of
the coach for comfort.