Advantages & Limitations of Servo Controlled Voltage Stabilizers
Advantages of a Servo Controlled Voltage Stabilizer:
Can handle a variation of more than 40% of the input voltage.
It is possible to design to handle 80% variation on the input.
Servo stabilizers can deliver an accuracy of +/-1% on the output.
The output voltage is continuous, smooth and very stable, as Servo voltage stabilsers use stepless auto transformers.
Expected life of a standard servo electro-mechanical stabilisers is usually more than 20 years.
The electronics and mechanical components (spare parts) of servo voltage stabilizers are easily available at very nominal cost.
The technology is in use almost for the past 30 years. This has proved the design to be a very reliable.
A low-level of ongoing maintenance is required for these voltage stabilizers.
The 30 years old technology is so simple that even a low profile technician can understand and service the servo stabilizers easily.
Limitations of a Servo Controlled Voltage Stabilizer:
Servo controlled voltage stabilizers can only boost the voltage when the input supply is within the functional range of the stabilizer. It cannot regenerate the voltage.
In case of long supply line with too low conductor cross-section and too high systems impedance, there is accute drop in line voltage. In such cases, when the servo voltage stabilizer tries to boost the voltage, the input supply drops further below the functional range of the stabilizer.
But, a reliable operation is possible (under limited conditions) by installing an intermediate circuit at the feeding point (typically a step-up transformer) to increase the voltage to the highest admissible level. And at the consumer point, by reducing and stabilizing the supply to the rated voltage (using a servo controlled voltage stabilizer).
Servo voltage stabilizer cannot regenerate (or correct) the frequency or wave form. For standard appliances, the absolute minimum frequency lasts 48 cps. When the current (frequency) or the voltage waveform (sine-wave departures) on the input of the servo voltage stabilizer deviates, they are transmitted in both directions without significant attenuation.
Servo Controlled Voltage Stabilizer cannot eliminate surges, spikes, short-peaks, glitches, or voltage dips. Control range, speed of synchronous servo drive, and rated frequency determine the correction time. However, a considerably shorter correction time can be expected because the control process begins previous with a voltage deviation of 1%.
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