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What is the meaning of STC Fitted / Static Converter Fitted as mentioned on locomotives?  
5 Answers
Apr 23 2013 (09:39)

Entry# 1543     
Soumitra Chawathe*^~
What is the meaning of STC Fitted / Static Converter Fitted as mentioned on locomotives?

Apr 23 2013 (09:35)
Blog Post# 731012-1     
Gopal*^   Added by: Soumitra Chawathe*^~  Apr 23 2013 (09:39)
It is mentioned on loco as "Static Converter Fitted" .What is its significance?

Apr 23 2013 (09:38)
Blog Post# 731012-2     
Guest: 7fc05a96   Added by: Soumitra Chawathe*^~  Apr 23 2013 (09:39)
The Static Converter provides an artificial means by which a three-phase motor can be operated from a single-phase supply thereby offering a cost-effective solution to this dilemma. In most instances, no modification to the machine is necessary.
The Static Converter is designed to operate three phase motors with starting characteristics and duty cycles as generally experienced on machine tool applications (ie. light to medium duty and relatively constant load conditions). This style of converter is typically used in single operator environments where only one machine is used at a time.

Apr 23 2013 (09:39)
Blog Post# 731012-3     
Begins Falls Rises ™~   Added by: Soumitra Chawathe*^~  Apr 23 2013 (09:41)
Q. What does 'Static Converter Fitted' or similar annotation mean on a locomotive?
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.
Static converters and microprocessor control have now become standard kit for all new production WAP-4s beginning
from the 22640 series. Static converters have become standard for all new WAG-7's too. This has also meant that the new locos may not carry the 'Static Converter' or 'Microprocessor Fitted' markings despite being equipped with these systems. These locos are now being distributed to all sheds.

Apr 23 2013 (09:54)
Blog Post# 731012-8     
VijayAditya*~   Added by: Soumitra Chawathe*^~  Apr 23 2013 (09:56)
The OHE of AC sections in India works on 25Kv single phase AC, this is fed to the loco with the aid of a panto where conversion has to take place to feed the three phase motors, older locos used ROTARY Converters where the input voltage was being fed to the Rotor(single phase) while Stator used to be a three phase STAR(wye) connection from which the output used to be taken.
Modern Locos have STATIC converters which employ solid state equipment to create a rotating magnetic field between the single phase source
and star connections to generate a 3 phase output. So practicaly there is no rotating part but technically the field does keep changing. This avoids the need of a convertor with moving parts arcing,wear, losses, maintenance and other trouble.
Locos with Static convertors fitted have it written on it, hope it helps..

Apr 23 2013 (10:05)
Blog Post# 731012-9     
Heiroglyphics   Added by: Soumitra Chawathe*^~  Apr 23 2013 (10:07)
A full diagram of a Single-phase to 3phase Convertion by idler motor... (Arno)
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