VARIVOLT AUTO TRANSFORMER Is a continuously
variable voltage autotransformer, having a movable carbon tip, fixed
to a brush - arm sliding on a silver plated commutator. Rotation of
the brush - arm by either manual or motor drive, delivers - an
output voltage from zero to or above line voltage. VARIVOLT conforms
to I.S. 5142 of 1969. |
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| Salient Features :- |
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Rugged Construction : Varivolt
Autotransformers are designed for heavy duty trouble - free
operation. All components are designed to give maximum life to the
unit under extreme operating conditions, and do not require to be
changed frequently. This practically makes the Varivolt a
maintenance free electrical equipment. |
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Excellent Regulation : The drop in voltage from
"no load to full load" is minimal in Varivolt Auto-transformers. |
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High Efficiency : Careful copper, core selection
and design assures the user of low watt loss, as compared to other
types of controllers. |
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No Wave From Distortion : Varivolt provides an
output voltage wave - from, which is a faithful and distortionless
replica of the input voltage wave from. |
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Silver Plated Communator : A special silver
plating technique is used on the commutator, enabling it to with
stand high overloads & maintain constant contact drop. It also
ensures smooth operation, long life & increased resistance to
corrosion. |
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Over-load Capacity : Because of its careful
designing, Varivolt can withstand many over - load. When repeated
over loading takes place, care has to be exercised that sufficient
of time is provided to reduce the temperature build-up. |
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Low Operating torque : A glass smooth commutator,
special sintered bushing for the shaft & perfect assembling fo the
coils, results in low operating torque for all Varivolt Auto -
teansformers. |
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Smooth & Linear Output : As voltage between
turns is small & as the brush-arm is in constant contact with more
than one turn, Harmfull sparking is avoided & output voltage can be
set very easily to fraction of a volt from zero onwards by rotation
of the knob. |
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Low Magnetizing Current : By using an adequate
section of high quality grain oriented silicon steel, the iron
losses in Varivolt, are controlled to the minimum. The no-load
current in all Varivolt transformers, is invariably less than 36% of
the rated current. |
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Negligible Maintenance & Trouble - Free Long
Life : Varivolt has been carefully designed. No special care has to
be taken to maintain varivolt auto transformers in normal working
environments. The only components needing inspections & maintenance
are the carbon tips & the commutator. Timely replacement of
the carbon tips & the commutator surface of foreign particles &
accumulated dust, will ensure a considerably long, maintenance -
free & uninterrupted life of the unit. Normaliy Varivolt Auto -
transformers upto 28 Amps. are offered in aircooled or oilcooled
construction. In very special cases varivolt of 40Amps. & above can
be offered in air cooled construction. This is possible due to the
new parallelling trchniques adopted by us. |
