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Satish kumar director delhi metro rail corporation

Satish Kumar


Delhi Metro Rail Corporation

Mr. Satish Kumar Director (Elect.), Delhi Metro Rail Corporation Ltd. (DMRC) currently is also a Govt. of India nominee on the Boards of Bangalore Metro Rail Corporation & Chennai Metro Rail Corporation. He is a former officer of the Indian Railway Service of Electrical Engineers and has over 45 years of professional experience and is one of the main persons behind the success of Delhi Metro Rail Project today.

Having been associated with this project right since its inception in 1998, for about 15 years Mr. Kumar has contributed immensely towards the introduction of the state of the art technologies in the Delhi Metro systems – Rolling Stock, Signalling, AFC etc., which has revolutionized the mass transport scenario of the national capital.

  He has also been Director incharge of operation and maintenance of Delhi Metro in its initial years upto 2005.

He has been conferred with many awards during the last 10 years, recent being the “Lifetime Achievement Award” by the Institution of Engineers (India) Delhi State Centre on 19th Jan 2013.

Satish kumar director delhi metro rail corporation

Design of Power Supply system for 527km High Speed Rail Line (300kmph) between Thiruvananthapuram & Kasargod

By Satish Kumar, Director/Electrical

Mahendra Kumar, Chief Elect. Engineer

International Seminar on High Speed Trains




Salient Features of Route

Power supply arrangements

Selection of Traction System

Selection of catenary system

Auxiliary Power Supply System

3. Conclusions

Salient features

Salient Features

Route Length - 527 Kms

Selection of the traction system

Selection of the Traction System

1500V DC system

AC system

25 kV ac

2X25 kV

Worldwide High Speed Railways have adopted

25kV ac system or 2X25kV AC Auto transformer


25kv ac system

25kV ac system

The system supplies power to the train-sets through 25kV ac overhead system. Current returns through the rail and the ground. The voltage between contact wire and rail is 25kV.

The voltage variation permitted as per EN 50163/ IEC 60850 is as below;

Mitigation of electromagnetic interferences emi
Mitigation of electromagnetic interferences (emi)

  • Booster Transformers are installed in series in the catenary, to reduce electromagnetic interferences.

  • These have limitations to mitigate the impact fully especially in case of failure of a few booster transformers.

  • It can have adverse effect on neighboring telecom system.

2x25kv ac single phase auto transformer system

2X25kV ac single phase Auto transformer system

This also supplies power to trains at 25kV ac but has transmission system of 50kV by Auto transformer system.

50kV is formed between the catenary, and a conductor called the ‘feeder

Satish kumar director delhi metro rail corporation

  • Catenary and feeder are supported on the same pole on the same track.

  • The transmission line so formed is coupled electrically to the catenary-rail loop via the auto transformers, which transforms this double voltage (50kV) into 25kV voltage for trains.

  • This system of auto transformer traction power supply system was first used in 1972 by the Japanese railways on the SANYO lines with the main objective of improving emi as compared to BT system.

  • It is learnt that France adopted 2X25kV ac Auto transformer system primarily from the point of view of reducing the emi and also the line losses.

Satish kumar director delhi metro rail corporation

It has other benefits compared to 1x25kV ac as under same track.

For equal volumes of traffic, the line voltage drops gets reduced by more than 2 to nearly 3,

Reduce the number of neutral sections

It gives flexibility to position the substations better with respect to existing grid lines

Discontinuity is not experienced in the contact wire as in the BT system.

In short electrical aspects of 1x25kv 2x25kv are
In short electrical aspects of 1x25kV & 2x25kV are same track.

Note: @-reduces the number of substation

Typical impedance for 2x25 ac system

Typical Impedance for 2X25 ac system same track.

  • 0.3 Ω per km using 1X25kV,

  • 0.12 Ω per km using 2X25kV

Selection of the catenary system

Selection of the Catenary System for Kerala High Speed line

Proper current collection at high speed by panto of train through contact wire is the main consideration.

Satish kumar director delhi metro rail corporation

Three types of 25kV ac catenary systems have been used world over

  • Compound type,

  • Y-stitch type and

  • Simple type

Satish kumar director delhi metro rail corporation

Compound Catenary system over

  • Compound system for HSR was evolved in Japan for first bullet train Shinkansen in 1964.

  • This system has a second catenary wire, called the auxiliary catenary wire between the main catenary wire and the contact wire. It is joined to the main catenary wire and the contact wire by means of droppers which helps to reduce variations.

  • However, the good current collection characteristics of this type of installation are offset by the increased material requirements and significant higher installation effort.

Satish kumar director delhi metro rail corporation

Compound Catenary system over

  • Latest compound catenary systems in operation is Taiwan-shinkansen

Y stitch catenary system

Y-stitch Catenary oversystem

A y-stitch wire is used to designate a connecting element inserted between the catenary wire and the contact wire.

  • Sicat H1.0 was used for HSR 300km/h in operation between Cologne and Frankfurt.

  • German rail has developed Y-stitch catenary system for conventional lines also

Simple catenary system
Simple Catenary system over

  • Simple catenary system with higher size conductors, heavier tension and a pre sag (of1/1000 of span) is reported to be adequate for speeds upto 350 kmph.

Satish kumar director delhi metro rail corporation

France over

‘TGV Atlantic line’ commissioned in 1989 with commercial speed of 300km/h.

TGV- Nord in 1993,

TGV- Mediterranean in 2001,


KTX- Kyungbu line in 2004.

TGV-est commercial speed of 350km/h.

Korea’s Kyungbu HSR line with a commercial speed up to 310km/h,

Auxiliary power supply system apss for the stations
Auxiliary power supply system (APSS) for the stations over

Reliable Auxiliary power is required for HSR for:

  • signal and telecommunication,

  • fire prevention,

  • tunnels,

  • stations,

  • depots, bases, facilities,

  • substations, SP, PP, RTU

  • CCTV, maintenance point, etc.

  • Commercial development on route

Typical design for apss
Typical Design for APSS over:

Reliability & availability assume equal importance. It can be achieved through two ways;

  • Using traction power

  • Laying separate power transmission line from the grid substations at 110 kV or 66kV


  • stepping it to down to 33kV or 11 kV for distribution through the cable network.


Conclusion over

From the techno-economical consideration it is proposed to go in for 2X25 kV traction system for the Thiruvananthapuram - Kasargod High Speed line

The power to the train is at 25 kV, ac, 50 Hz, single phase supply.

Simple catenary is proposed.

The Auxiliary Power supply system, power at the passenger stations shall be taken from the grid substations, stepped down at 33 kV or 11 kV and distributed through a cable network.

Concrete viaduct not being good conductor of electricity Earthing and Bonding arrangements will be designed specially.