THREE PHASE VARIABLE OIL COOLED AUTO TRANSFORMER
We specialize in the manufacture of high current rated coils. The commutator surface of our coils is machine processed and hence very uniform and smooth. This is very important for proper collection of current by the carbon brushes thus reducing the heat generated. Our standard coils are 100 Amp, 150 Amp, 200 Amp.
Using these coils we manufacture Oil Cooled Variable Autotransformers (colloquially known as Variac) from 100 Amp 3 Phase to 1200 Amp 3 Phase capacity (415 V input and 0-470 V variable output). In high current rated models of Oil Cooled Variable Autotransformers, we use multiple coils with properly rated balancing coils to achieve the rated current. Based on the calculations of cooling area, appropriate number of radiators & fins are used. These Oil Cooled Variable Autotransformers (colloquially known as Variac) are generally motorized with geared mechanism.
We also cater to tailor-made requirements of Oil Cooled Variable Autotransformers.
Features of Three Phase Variable Auto Transformer
SMOOTH CONTROL : A variac can be set to any output voltage within its range. Output voltage is continuously variable from zero to maximum. As voltage between turns is small and as the bush arm is constant touch with more than one turn harmful sparkling is avoided and the ouput can be set very easily to a fraction of a volt from zero onwards by rotation of the knob.
LOW OPERATING TORQUE : A smooth carbon brush and the perfect assembling of the coils result in low operating torque for the auto transformer
BETTER EFFICIENCY : Very low loss under all loud conditions. Our variable auto transformers are designed with very low loss grain oriented strip cores. Careful selection of copper ensures the use of low watt loss as compared to other type of controllers.
NO WAVEFORM DISTORTION : Our variac offers distortion less output voltage waveform
BETTER REGULATION : The drop in voltage from No load to full load is very minimal in variac
LINEAR OUTPUT VOLTAGE : Output voltage varies linearly with angle of rotation of control knob
ADVANCED DESIGN : Excellent electrical specification is matched by rugged compact construction. Brush replacement is simple and convenient. Two ,three or more units can be ganged on one shaft for series and parallel connection
COMPACT SIZE
NEGLIGIBLE MAINTENANCE AND TROUBLEFREE LONG LIFE