The document summarizes various power supply systems used in Indian railways such as self-generating (SG) systems, end on generation (EOG) systems, and head on generation (HOG) systems. It discusses the development and key aspects of each system including their merits and demerits. The SG system was developed by CRIS and provides independent power but has limited capacity and poor efficiency. The EOG system has higher capacity but is costly and polluting. The HOG system draws power from overhead lines making it more efficient and pollution-free compared to the other systems.

1. PS&EMU directorate/RDSO
VARIOUS POWER SUPPLY SYSTEMS
➢ Self generating system(SG)
➢ End on generations(EOG)
➢ Head on generations(HOG)

2. DEVELOPMENT OF SELF GENERATION SYSTEM (SG)
• The self generation system is invented by “centre for
railway information systems (CRIS)” of the indian
railways, ministry of railways, government of india.
• It is located in “chanakyapuri, new delhi.” CRIS was
establish by indian railway in “1986 July”
• The self generating system is invented key people of
ashvini vaishanaw [Minister of railways],
V.K.Tripathi[chair person and chief executive officer].

3. MERITS OF SELF GENERATING SYSTEMS
• Independent of the iron formation
• Independent of mode of traction
• No additional source of power is required
• It can be designed to specific need of the coach
• The most of the commen types of train , run’s at an average speed of
50.6 km/h

4. DEMERITS OF SG SYSTEM
• Limited capacity of generation, at present 2 x 25 KW per coach
• Power is not generated during standing/slow speed, hence bulky
batteries are required
• High maintenance requirements and poor reliability
• Very poor efficiency (58% only)

5. END ON GENERATION SYSTEM
• The self generation system is
invented by “centre for railway
information systems (CRIS)” of the
indian railways, ministry of railways,
government of india.
• It is located in “chanakyapuri, new
delhi.” CRIS was establish by indian
railway in “2008 Feb”
• The end on generation system is
invented by “Ajay kumer
nigam”[loco pilot present] and
“Sathish shrivastar”[senior assistant,
loco pilot]

6. MERITS OF END ON GENERATION (EOG)
SYSTEM
• High capacity of power source is available, at present 2 x 336 KW
• No need of bulky batteries
• Low maintenance requirement and high reliability as stand by DA set
is available
• Independent of traction system
• Power transmission at 750V with reduced transmission loss.
• Reduced dead weight as compared to SG system
• A train which consists of length 650 meters
• The most of the commen types of train , run’s at an average speed of
75 km/h

7. DEMERITS OF EOG SYSTEM
• Higher cost of energy due to high fuel cost
• Noise/ Smoke pollution and non environment friendly
• Loss in passenger earning capacity due to presence of two power cars with
on-board DA sets at both ends
• Can feed load upto 21 coaches only with existing DA set
• Requires intensive maintenance of DA sets

8. HEAD ON GENERATION SYSTEM
• The self generation system is invented by
“centre for railway information systems
(CRIS)” of the indian railways, ministry
of railways, government of india.
• It is located in new delhi.” CRIS was
establish by indian railway in “2011
SEPT”
• The system run’s the trains hotel load [the
load of air conditioning lights, fans, and
pantry etc] by drawing electricity from
the over head electric lines through the
pantograpy.

9. MERITS OF HOG SYSTEM
• Input supply to hotel load converter is single phase 750 V AC from the transformer of
locomotive
• This would cause the trains to become more cost-efficient and less polution.
• Globally, HOG is an established system of power supply arrangement in trains
• Pollution free and cheaper power from OHE as compared to EOG system and SG system
• Highest reliability as compared to SG and EOG system due to reduced number of
generating equipment
• No irritating noise or smoke
• Low maintenance requirement
• Reduced dead weight as compared to SG

10. • Suitable for diesel as well as electric traction
• Elimination of under-slung equipment like alternator & battery thereby enhanced safety
• HOG type AC coaches shall be interchangeable with EOG type trains
• Charging of battery from alternator requires at least 24 km/h (cut-in) train speed. Operation of SGAC
coach is thus difficult in slow moving
• The trains chaging of battery from alternator requires at least 24km/h
• High efficincy (93%) and low running of the train.

11. ROUTE RELAY INTERLOCKING SYSTEM (RRI)