|
|
|
|
TRACTION DISTRIBUTION (as on 31.03.2023)
VISION The vision of Traction Distribution is to provide safe, reliable and efficient operation of goods and passenger services.
ACTIVITIES: 
Progress of Electrification on South Central Railway
Electrification on SCR started with the electrification of Vijayawada - Gudur section in 1980. By the end of March 2023, a total of 5,802 Route kilometers and 12,005 Track kilometers have been electrified, spreading over six divisions Secunderabad, Vijayawada, Guntakal, Guntur, Hyderabad and Nanded of SCR. Out of the total 6,471 (BG) Route kilometers of track on SCR, 5,802 Route kilometres i.e., 90% of the total track have been electrified & 2022-23, SCR electrified 1017 RKM which is second highest over Indian Railways. The prestigious Vande Bharat train work on electric traction. A 8 car Vande Bharat train has a power of approx. 4500 hp & A 16 car Vande Bharat train has a power of approx. 9000 hp. 
Division wise Electrification
| Division | SCR Total Route Km | Total Route Km Electrified (BG) | Total Track Km Electrified (BG) | | Secunderabad | 1557 | 1508 | 3529 | | Vijayawada | 1065 | 1004 | 2791 | | Guntakal | 1449 | 1436 | 3024 | | Guntur | 678 | 678 | 1118 | | Hyderabad | 737 | 572 | 840 | | Nanded | 986 | 603 | 704 | | Total | 6471 | 5802 | 12005 |
State wise Electrification | State | Route Km | BG RKM | MG RKM | Total RKM | | Electrified | Non-Electrified | | BG | BG | MG | | Andhra Pradesh* | 2930.229 | 63.998 | 0 | 2994.227 | -- | 2994.227 | | Telangana* | 1838.115 | 127.143 | 0 | 1965.258 | -- | 1965.258 | | Maharashtra | 737.938 | 304.817 | 59.940 | 1042.755 | 59.940 | 1102.695 | | Karnataka | 288.669 | 98.50 | 0 | 387.169 | -- | 387.169 | | Madhya Pradesh | 0 | 0 | 70.18 | -- | 70.18 | 70.18 | | Tamil Nadu | 6.86 | 0 | 0 | 6.86 | -- | 6.86 | | Total | 5801.811 | 594.458 | 130.12 | 6396.269 | 130.120 | 6526.389 | * 51.799 RKM added to Telanagana (Bhadrachalam-Bhavanapalem-Sattupalli section in SC divn) and 3.172 RKM added to Andhra Pradesh (GY Bypass line of GTL divn.) in Electrified BG RKM Electrified sections over SC Railway - Vijayawada – Gudur
- Vijayawada - Visakhapatnam
- Vijayawada – Bhimavaram Town-Nidadavollu
- Gudivada – Machillipatnam
- Bhimavaram Town-Narsapur
- Samalkot – Kakinada
- Obulavaripalli – Krishnapatnam Port
- Vijayawada - Kazipet – Ballarshah
- Dornakal - Karepalli - Singareni collieries – Bhadrachalam - Manuguru
- Peddapalli – Lingampalli Jagityal – Morthad-Nizamabad
- Kazipet - Secunderabad - Hyderabad – Sanathnagar – Vikarabad – Wadi
- Vikarabad – Parli Vaijnath
- Manikgarh – Gadchandur
- Motumarri – Jaggayapeta – Mellacheruvu – Janpahad - Vishnupuram
- Gudur - Renigunta – Tirupati – Pakala – Katpadi
- Renigunta – Gooty – Guntakal - Wadi
- Gooty-Dharmavaram
- Gooty – Pendekallu
- Guntakal - Kalluru
- Guntakal – Bellary
- Dharmavaram – Pakala
- Nandyal-Yerraguntla
- Krishna Canal - Guntur – Nallapadu – Dhone - Guntakal
- Guntur – Tenali - Repalle
- Nallapadu – Nadikudi – Pagidipalli
- Nadikudi – Macherla
- Sanathnagar - Lingampalli Under Multi Modal Transport
- Telapur – Ramchandrapura Under Multi Modal Transport
- Ghatkesar – Moula Ali 3rd & 4th line under Multi Modal Transport
- Secunderabad –Umdanagar Under Multi Modal Transport
- Secunderabad – Malkajgiri – Medchal Under Multi Modal Transport
- Medchal – Manorabad-Nizamabad-Basar
- Jankampet-Bodhan
- Umdanagar-Dhone
- Gadwal – Raichur
- Akola-Purna
- Pimpalkutti-Mudkhed
- Parli Vaijnath-Parbhani
- Ankai-Aurangabad-Dinagaon
Electrification under progress over South Central Railway: - Dinagaon –Parbhani-Nanded-Mudkhed-Basar
- Bidar-Gulbarga
- Devarakadra-Krishna
- Kadapa-Pendilimarri
- Akkanapet-Medak
- Manorabad-Gajwel
- Akola-Akot
- Kotapalli-Manoharabad
- Kakinada-Kotipalli
System of working of Electric Traction Distribution
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.
Technological Improvements  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. Contactless Thermovision camera 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 re-closures to all feeder circuit breakers to minimize power supply interruption to OHE. Provision of Numerical relays in place of electromagnetic type relays. 2 x 25 KV AT system is proposed in Ballarshah – Vijayawada-Gudur & Vijayawada-Duvada sections to run 160 kmph trains & to meet Mission 3000 MT target by 2030
Special Features of SCADA
 - 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
Safety
All the traction masts and structures are earthed properly so as to negate any possibility of electric shock due to any leakage of power. Sufficient clearances are maintained with earthed structures. A working clearance of two meters is maintained from the live OHE. All FOB’s & COP’s are earthed to rail & to earth electrode. Protective screens on FOB’s/ROB’s are provided.
Some of the Safety Tips to be followed by "PUBLIC" to safely travel in Electrified section are given below:
| | |
