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These are basically cooled, floor mounting construction, immersed in transformer oil, confirming to IS 335. Cores are rigidly mounted on non magnetic frame and high grade carbon brushes collect the current from side of the wingdings. Full variation of the output from 0 to max. value is available in one revolution (approximately 350°) of the handle.
Units are supplied without oil. Standard transformer oil is to be filled by the user at site.
Besides manual operation, these are also available in motor operated mode with shaft driven by a high torque low speed drive motor through a gear train. Time taken for one revolution is 15 seconds upto 100 Amp models & 30 second for above 100 amp models.
Higher timings can be provided on request.

Specifications
Standard models are made to the following specifications

	1 Phase	1 Phase *	3 Phase
Input	230 V	400 V 1 Phase	400 V 3 Phase
Output	0-230V/270V	0-400/ 470V
Current	40, 50, 60, 75, 100, 150, 200, 300, 400, 500 & 600 amps.
Frequency	50/60 HZ
Insulation Class	A

*Many a times these are referred as 2 phase units as the input to these units is from 2 lines of 3 phase supply

Salient Features:

• Wingdings are made of electrolytic copper conductor
• Cores made from low loss, non aging high grade silicon steel
• Radiators have been provided for effective cooling wherever required