Stabilise fluctuations
An ideal voltage stabilizer corrects the voltage fluctuation by either boosting (enhancing) the supply voltage to the required level or by bucking (reducing) the voltage if in excess. A good voltage stabilizer also provides a start-up delay function once the voltage is at a safe level.
Some tips
• Power rating: Power-handling capacity of the stabilizer is important for the safe and economical use of appliances. It is always better to select a stabilizer with capacity slightly higher than the power rating of the appliance . Another important parameter is the current rating of the stabilizer.
As most of the electrical appliances tend to draw more current when they start, the stabilizer must be powerful enough to supply the required current to the appliance during start-up.
• Input voltage range: A voltage stabilizer will work only within a specified voltage range. But it comes in ranges such as 150 V to 275 V and 130 V to 300 V. A wide-range stabilizer will be ideal . And it is always wise to select a stabilizer suitable for the voltage variations expected. To combat high voltage, you will need a stabilizer with less boost and wide buck.
• Low and high voltage cut-off: If the supply voltage goes to an extremely high or dangerously low level, the stabilizer will no longer be able to provide the required output.
Under this condition, a stabilizer with high/low voltage cut-off will disconnect the appliance from the AC mains, thus protecting the device.
• Intelligent time-delay system: Refrigerators and air conditioners come under this type of electrical appliances.
Such devices can be safely switched on only if the time gap from the previous switch off is greater than a specified value of 3 minutes.
• After-sales service: A good and easily available after-sales service will be of help.
T.K. MANI
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