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Explain working of servo controlled voltage stabilizer.
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Answer Posted / siddhu
The SERVO CONTROLLED VOLTAGE STABILIZER utilizes a motor
driven variable
auto transformer & a Buck\Boost transformer. Which is
connected between the incoming
phase supply & the load. The primary winding of the Buck \
Boost transformer is
connected to the continuously Variable Auto Transformer in
such a way that One lead of
the winding is connected to a predetermined tap point of
the auto transformer,
depending on the position of the variable brush arm with
respect to the fixed point the
voltage applied to the primary winding has addition or
subtraction on the supply voltage
available on the secondary side.
The autotransformer is driven by an AC synchronous motor to
achieve increase or
decrease in output set voltage by rotating it in clockwise
or anticlockwise direction
depending on the input supply voltage.
An electronic control card continuously monitors the
output voltage and the same is
being compared against the set reference voltage to achieve
the desired output voltage.
The control card responds to the variation in input voltage
in such a way that the motor
in voltage correction doesn’t overshoot in either
direction. This method of correction in
output voltage is free from generating waveform distortion
& harmonics.
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