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Blog Entry# 1913749
Posted: Jul 01 2016 (13:19)

6 Responses
Last Response: Jul 01 2016 (17:38)
General Travel
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10

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Jul 01 2016 (13:19)  
 
shailshekhara
shailshekhara   35240 blog posts
Entry# 1913749              
New Technological Developments In Electric Traction

High Rise OHE(7.57 M) & 2x25 KV System

High Rise OHE(7.57 M)
...
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Required for double stack container operations with electric traction. Successful trials done in ECoR with OHE height as 7.45 meter Pantograph also suitably modified. Normal OHE height is 5.5 meter. Complete Western DFC is with high rise OHE. On Indian Railway routes, high rise OHE being provided in Gurgaon-Mehsana, Jaipur-Phulera, Rewari-Ludhiana. Total 1188 RKM.

Images :- High Rise Pantograph in action


2x25 KV System

The 2 × 25 kV autotransformer system may be used on 25 kV lines to reduce energy losses. It should not be confused with the 50 kV system. In this system, the current is mainly carried between the overhead line and a feeder instead of the rail. The voltage between the overhead line (3)(refer attached image) and the feeder line (5) is 50 kV but the voltage between the overhead line (3) and the running rails (4) remains at 25 kV and this is the voltage supplied to the train. This system is used by Indian Railways, Russian Railways, French lines, Amtrak and some of the Finnish and Hungarian lines.

Higher hauling capacity. Increased Traction Substation spacing at 60-80 km apart against existing spacing of 40 km. Higher OHE current carrying capacity due to doubling of voltage (50kV). Improved voltage regulation and reduced transmission line losses. Seamless running of locomotives from 1×25 kV to 2×25 kV system.

Images :- 2 × 25 kV Autotransformer system, 2 × 25 kV OHE
Pdf:- Comparative Study Of The Electrification Systems 1X25 kV And 2X25 kV

Source :- 1 | 2 | 3 | 4
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Jul 01 2016 (13:27)guest
Re# 1913749-2              
This will be used from Ahmedabad to Phulera and Phuelra to Rewari via Ringus..
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Jul 01 2016 (13:30)
shailshekhara
shailshekhara   35240 blog posts
Re# 1913749-3               Past Edits
Complete Western DFC is with high rise OHE & 2x25 KV, 50 Hz AT traction feeding system

Attached
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Jul 01 2016 (13:31)
de_prakash^~
de_prakash^~   11154 blog posts
Re# 1913749-4              
Loco looks like a snake hood. :O
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Jul 01 2016 (13:35)
~   447 blog posts
Re# 1913749-5              
Good move by railway as Double stack of containers will double the efficiency of one train and it will be cost efficient too.
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Jul 01 2016 (17:38)
shailshekhara
shailshekhara   35240 blog posts
Re# 1913749-6               Past Edits
Tests were initially conducted with a pair of WAG-7 locomotives and later with empty and loaded trains on July 7-8 2008. The locomotive fitted with the high-reach pantograph made four successful runs from Jakhapura station, where standard OHLE is in use, to Tomka station, where the high-rise OHLE is installed. A distance of 21∙9 km was covered under 7450 mm high OHLE, and the transition between standard and high-rise OHLE was negotiated successfully on every trip. Current collection was smooth and almost without arcing on both the transition and high wire sections.
Current collection performance was monitored with the help of...
more...
Olivir-G software. A continuous record of the runs showed that there were no significant sparks up to a speed of 70 km/h, the maximum permitted on the test section.
From the recordings made using the Netra car on the trial runs it was also observed that the contact:loss ratio was 3∙17%. This value falls well within the permissible value of 20% adopted on Japanese Railways and on Indian Railways, where it is around 5%. The Netracar did not detect any other abnormalities.
No irregularity in current collection was observed during tests with the locomotives operating by themselves, nor with empty or loaded trains. The tests confirmed that the high-reach pantograph worked satisfactorily under both the existing and 7 450 mm OHLE, so validating the design for operation in the Dedicated Freight Corridors. On the basis of these tests IR decided in August 2008 to electrify the Western Corridor at 25 kV 50 Hz.

Source:- 1
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