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Blog Entry# 2053165  
Posted: Nov 08 2016 (19:06)

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Info Update
Nov 08 2016 (19:06)   BL/WCAM-1/21800

ANUBHARADWAJ MAHARSHI   2468 blog posts   108 correct pred (63% accurate)
Entry# 2053165            Tags   Past Edits
First ACDC locomotive WCAM/1 21800 called "VALLABH"
WCAM-1 is a class of locomotives used in the Indian Railways system. They are the first of the WCAM series. These locos can be seen in Mumbai-Vadodara-Ahmedabad section but occasionally they travel up to Pune but not beyond these because the maintenance facilities are not available beyond this point. An occasional loco has also appeared on Mumbai C.S.T.-Igatpuri route. This locos works on both AC as well as DC as their classification suggests.
These locos hauls the trains from DC section of suburban trains to AC
section and performs very critical task as they can easily operate on both AC and DC. However they perform poorly in DC mode compared to AC mode but they are very robust and have easy operating and handling characteristics. These loco are now very less in use as Western Railways DC section has been converted in AC. They are used for the second tier general/express/super-fast trains of Western Railway.[4] These are 1st class of Wide Gauge's(W) Bi-current charged(CA - runs both under AC and DC) and Mixed load series(M - hauls both passenger and freight trains). These were the first electric locomotives to enter Western Railway's Mumbai division. Prior to that steam and diesel locomotives used to haul trains in Western Railway's Mumbai division. These brought end to the steam era in this division. They were also the first locomotives allotted to Valsad (BL) shed. They are now the most low-horse powered surviving electric locomotives under AC in the country along with WAM-4. Their top speed under DC is also the lowest compared to other Bi-current charged locomotives. They were the first Bi-current charged locomotives in the country. Initially all were vacuum braked but were retrofitted with air brakes to make them dual braked. Some also had there vacuum brakes replaced with air brakes. Due to the reduction of DC territory in Mumbai, some locomotives had their DC equipment removed at the shed. Now these locomotives only run under AC territory. They are soon to be decommissioned.
Introduced in 1975. One of the single pantographs on the WCAM-1 is used in dc traction; the other one carries ac current. The two pantographs are not identical, though similar in design. Originally built with vacuum brakes only, although a few (Nos. 21805, 21807, 21812, 21828, 21838, 21844, 21845, and 21850) have both vacuum and air brakes. They also lack dynamic brakes.
The WCAM-1 does not use a variable ratio auto-transformer in AC mode like the others; it uses a fixed-ratio transformer and rectifier bank to convert the OHE supply to 1500VDC. The design of the transformers and notches makes this a hard machine to operate, with the fusible links tending to blow often. Of the 28 notches, notches 4, 14, 21, and 28 can be used for continuous operation, although notch 4 was intended for low-speed shunting and is very ineffective. Notches 14, 21, and 28 are the terminal notches of the series, series-parallel, and parallel circuit notch sequences. In DC mode, the WCAM-1 uses resistor banks for speed control.
However they were very robust machines and relatively easy in the handling characteristics. WCAM-1's have three traction modes (series, series-parallel, parallel) in both DC and AC mode, but using the parallel mode in DC was discouraged because of power problems. In practice this was not restrictive since series-parallel notches allowed reaching 75 km/h or so. In AC mode, the locos are almost always used with the motors in all-parallel mode. Unlike the WCAM-2 and WCAM-3 locos, no reconfiguration has been carried out to force the use of all-parallel mode with AC. Weak field operation is available. They were briefly tried out for freight use by CR, but all finally ended up with WR.
The top ones getting the WCAM-2P (see below). [5/02] However, recently CR's Indore-Pune weekly train has been hauled by a WR WCAM-1.
Recently [2004] it's been seen that some (3-4) WCAM-1 locos have been modified to run only in AC mode; in many cases these locos have even had their DC equipment removed. Such modifications occurred after WR's Virar - Vasai freight lines were converted to AC. It is not proposed that the locos will be re-classified; one, #21808, simply bears an annotation saying 'Only AC Working'.
Max. speed 100 km/h, 110 km/h after regearing. Traction motors are nose-suspended and axle-hung.
Source:click here

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