Automatic Voltage Regulator Relays are frequently used in large power transformers. As the name suggests, these devices regulate the fluctuating voltage in the supply end of a transformer and output a specified constant voltage.

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Usage

When the different loads on the power line are low, the voltage supplied by the power transformer remains stable. But if the load starts increasing due to more drawing of current by the industries or houses, the voltage starts fluctuating. A device called the tap position indicator can be used in this scenario. The tap position indicator is attached to the secondary winding of the step-down transformer. It measures the current output voltage from the power transformer and shows the percentage error of the transformer output.

Here comes the need of the automatic voltage regulator relay. The regulator takes the data from the tap position indicator. When the terminal voltage and reactive power of the synchronous transformer change, the output current of the device is automatically controlled according to the corresponding feedback signal to achieve the purpose of automatically regulating the terminal voltage.

Benefits of using an Automatic Voltage Regulator

There are several advantages of using an AVR for personal devices and even in industries. A few of them are mentioned below.

Utility Voltage Levels

This is the reason described earlier where the demand of the users determines the output voltage of the system. Therefore users can get maximum voltage only in the middle of the night when the load is comparatively the lowest as most factories are shut.

Faster correction

The automatic voltage regulators have sensors which decrease the response time and correct the voltage in unlimited cycles.

Sensitivity to Voltage Levels and Voltage Fluctuation

Though most devices can operate within a voltage range, in no way the efficiency remains the same in every kind of voltage. The devices that can operate only in +/- 5% (or less) of nominal voltage would be considered to be sensitive to a certain voltage level or fluctuations. Such devices need a voltage regulator for stopping them from damages.

Voltage regulation for effective business

Failure in any kind of heavy machinery in factories due to high voltage fluctuations can cause a lot of damage to the production chain. Loss of time and huge amounts of revenues can leave the customers dissatisfied with no products and lead to shutting down of the business.

Low maintenance

The automatic voltage regulators require no major maintenance and therefore offer maximum service life.

Automatic voltage regulation is a necessary process for the safety of electrical devices. Using the automatic voltage regulator relay users can achieve this easily.