TRACTION DISTRIBUTION (as on 31.10.2022)
Electrification on SCR started with the electrification of Vijayawada - Gudur section in 1980. By the end of October 2022, a total of 5,094 Route kilometers and 10,877 Track kilometers have been electrified, spreading over six divisions viz Secunderabad, Hyderabad, Vijayawada, Guntakal, Guntur, Hyderabad and Nanded of SCR. Out of the total 6,471 (BG) Route kilometers of track on SCR, 5,094 Route kilometres i.e., 79% of the total track have been electrified.
SCR Total Route Km (BG)
Total Route Km Electrified (BG)
Total Track Km Electrified (BG)
Vijayawada – Gudur
Vijayawada – Bhimavaram Town-Nidadavolu
Gudivada – Machillipatnam
Samalkot – Kakinada Port
Vijayawada - Kazipet – Ballarshah
Dornakal - Karepalli - Singareni collieries – Bhadrachalam Road – Manuguru
Peddapalli – Lingampalli Jagityal – Morthad-Nizamabad
Kazipet - Secunderabad - Hyderabad – Sanathnagar – Vikarabad – Wadi
Vikarabad – Kohir-Latur Road
Manikgarh – Gadchandur
Motumarri – Jaggayapeta – Mellacheruvu – Janpahad – Vishnupuram
Gudur - Renigunta – Tirupati – Pakala – Katpadi
Renigunta – Gooty – Guntakal – Wadi
Gooty – Pendekallu
Guntakal – Kalluru
Guntakal – Bellary
Dharmavaram – Pakala
Krishna Canal - Guntur – Nallapadu – Dhone – Guntakal
Guntur – Tenali – Repalle
Nallapadu – Nadikudi – Pagidipalli
Nadikudi – Macherla
Obulavaripalli – Krishnapatnam Port
Sanathnagar - Lingampalli Under Multi Modal Transport
Telapur – Ramchandrapura Under Multi Modal Transport
Ghatkesar – Moula Ali 3rd & 4th line under Multi Modal Transport
Secunderabad – Falaknuma - Umdanagar Under Multi Modal Transport
Secunderabad – Malkajgiri – Medchal Under Multi Modal Transport
Medchal – Manorabad-Kamareddi
Nandyal – Yerraguntla
Gadwal – Raichur
Janakampet-Nizamabad (incl. Jankampet – Bodhan)
MMTS Phase – II (Moula Ali – Sanathnagar)
Purna – Hingoli Deccan
Rotegaon- Mudkhed – Janakampet
Mahbubnagar – Kurnool Town
Parbhani – Parli Vaijnath
Latur Road – Parli Vaijnath
The Electric supply from the State Grid is availed at 220/132 KV, 2 Phase and is stepped down to 25 KV, Single Phase at the Traction sub-stations. This 25 KV single phase supply is fed to the over head conductor system consisting of a grooved contact wire suspended from catenary wire by flexible droppers. There is a continuous sliding contact between the pantograph pan of the locomotive and the bottom of the contact wire. The pantograph of the locomotive when raised applies a pressure of 7.0 Kg/Cm² against the contact wire which ensures the continuous and smooth collection of current from the Over Head Conductor to the locomotive. The 25 KV supply is further stepped down and rectified and fed to the Traction Motors. The return current flows through the loco wheels to the Rails and form the Rails to the earthed terminal of the traction transformer thus completing the single phase electric circuit. As the rails are earthed, it is ensured that the potential of the return current, is not increased above the earth potential. This ensures that there is no electric hazard to the public coming in contact with electrified tracks. The speed variation of the locomotive is achieved by varying the input voltage to the traction motors.
In the newly electrified sections, 21.6/30.24 MVA Power Transformers have been provided at Traction Sub-stations (TSS). The capacity of these transformers can be increased from 21.6 MVA to 30.24 MVA by switching on forced air circulation fans.
The switch gear at the TSSs is of state-of-art SF-6/ Vaccum type. These switch gears require less maintenance as compared to oil switch gears, which were used earlier.
Provision of improved version of distance protection relays at TSSs to avoid spurious circuit breaker trippings and consequent interruptions to OHE power supply.
Provision of PTFE type short neutral sections in OHE to avoid stalling of Goods trains in gradient section.
The manually operated isolators at major yards have been motorized to facilitate quick isolation of faulty section of OHE and to reduce the detention to trains to main lines during breakdowns/ unusual occurrences.
Contactless Remote Sensing Device is used for identifying hot spots pertaining to connectors of the OHE jumpers, Busbars etc., of the TSSs/ Switching stations and to plan attention prior to failure.
Provision of long creepage Insulators for the OHE situated in polluted zone to avoid flash over and consequent failure of insulators.
Provision of Hybrid Insulators where OHE is prone for stone pelting activity by miscreants/cow-boys.
Provision of High speed Auto reclosures to all feeder circuit breakers to minimize power supply interruption to OHE.
Provision of Numerical relays in place of electromagnetic type relays.
PC based computer remote control system with the following special features have been installed at Secunderabad, Vijayawada, Guntakal, Guntur and Hyderabad,
All operations of Circuit Breakers, Interruptors etc., situated in the Sub-stations and Switching Stations over the length of Railway line can be remotely operated from the Divisional Control Office by simple commands through key board/mouse
The status of different equipment and values of voltages and currents are continuously monitored and displayed on the video monitors attached to the operator workstations.
Automatic fault isolation is done by SCADA system in case of faults on OHE
All the operations of the TPC and events are automatically logged in the system
Do not carry vertically long poles/ any other articles in the vicinity of overhead live conductors.
Do not touch/ walk on Rails.
Do not travel on roof of coaches and wagons, as overhead live conductors are fatal.
Tress-passing in electrified station yards is strictly prohibited for your own safety.
Do not project any metallic parts from Foot over bridge / Road over bridge towards live wires and conductors.
Do not pour water from Road over bridges/ Foot over bridges on the overhead wires and conductors.
Do not lean out from compartment while train is in motion.
Do not travel on top of Road vehicles passing through Level Crossing Gates.
Do not try to pass through Level Crossing Gates with consignments higher than the height gauge level.
Do not forget that Overhead Traction wires are always live and dangerous
Source : South Central Railway CMS Team Last Reviewed : 28-11-2022