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What does ‘Static Converter Fitted’ or similar annotation mean on a locomotive?

20-06-2019

Locos traditionally had a rotary converter (of Arno make) to generate 3-phase AC on board to power auxiliary equipment such as traction motor blowers, compressors, exhausters, etc. Starting in the 1980s static converters using solid-state circuitry to generate 3-phase AC on board have been used instead of the Arno converter, driving up efficiency and reliability by eliminating the moving parts that the Arno contained. ये भी पढ़े - 10 ईज़ी वेट लॉस टिप्स Static convertors and microprocessor control have now become standard kit for all new production WAP-4s beginning from the 22640 series. Static convertors have become standard for all new WAG-7's too.

How do the AC-DC locos (WCAM series) switch from one power source to another on the run?

July 16, 2019

At DC/AC changeover points as on the Virar-Vaitarna section, WCAM locos can switch from one power source to another without stopping. The WCAM-1 has a selector on the rightmost side of horizontal control panel for selecting the pantograph. It has four positions, DC, AC, DC-ALT and AC-ALT. In DC and AC-ALT mode, pantograph with two collector shoes

How are DC locos swapped for AC locos at the point where traction power changes from DC to AC?

July 16, 2019

Today while the the Mumbai area is still mostly at 1.5kV DC, there are a couple of important AC-DC transition points such as Igatpuri -- now Kasara -- and Virar. In time, when 25kV AC becomes the norm and DC traction is decommissioned, these transitions will be history and there will be no more traction changeovers! Sad for railfans, but perhaps

Why is the neutral section provided with a dummy (neutral or electrically dead) cable? Why can’t it be a real gap?

July 16, 2019

Pantographs of electric locomotives have a spring mechanism or compressed-air assembly that keeps the pantograph pushing up against the contact wire with a certain specific pressure. If the neutral section were not wired and the contact wire simply ceased to exist, then then possibility exists that if the driver has not dropped the pantographs at

How are phase breaks (AC) or power gaps (DC) handled by the locomotives?

July 16, 2019

The catenary has breaks or gaps in its electrical continuity every once in a while at points where successive sections are connected to different substations. A neutral section of catenary is usually provided between the two live sections of different phases or connected to different substations. At such points, single locomotives do not drop

How do the new 3-phase AC locos (WAP-5, etc.) work, and how do they compare with the earlier locos?

July 16, 2019

Three-phase AC locos such as WAP-5 use some fairly new technology as compared to the earlier generations of diesel-electrics and electrics. In most of the earlier locos, the traction motors driving the axles are DC motors. DC motors were used because they afforded (in those days) far superior speed and torque control compared to AC motors — the

What’s the history of electric traction in India?

July 16, 2019

The first electric train ran between Bombay's Victoria Terminus and Kurla along the Harbour Line of CR, on February 3, 1925, a distance of 9.5 miles. In 1926, Thana and Mahim were connected. In 1927, electrification was complete up to Kalyan. In 1928, Borivili in the north was connected (Colaba-Borivili of WR being inaugurated on May 1). In 1929,

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What does ‘Static Converter Fitted’ or similar annotation mean on a locomotive?

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