About Three-Phase AVR System

The three-phase AVR processes the three-phase alternating current (AC) power, the power from the grid, or the generator. Although such a unit takes the power as the input, some stabilizers can generate both three-phase and single-phase power depending upon the design and actual application. The three-phase voltage regulator usually works for three-phase loads solely. The application of the three-phase AVR/AVS is typical in commercial and industrial settings, such as companies and factories, because these settings demand a great amount of power supply, with constant voltages as well.

Why AVR is important for generators

Unregulated generators are generators without an automatic voltage regulator (AVR) which are generally unable to satisfactorily meet the power needs and requirements for every piece of equipment or device connected to the generator. This is because they are unable to control or regulate voltage, so the terminal voltage will always keep decreasing as the load requirements continue to increase.

If the voltage of a generator is not retained at a constant or fixed-rate, its overall performance can be negatively impacted and any utilities, equipment, or machinery that is being powered by the generator may also be negatively influenced.

The three-phase automatic voltage regulator (AVR) directly correlates to the performance and longevity of the generator, as well as the commodities that the generator is providing power to, and ensures that the voltage output delivered will be consistent in its load current even if fluctuations were to occur in the background. This helps mitigate and even eradicate the damage that any fluctuations can cause to appliances,

machinery, devices, and equipment.

Features of the AVR system

1. Voltage Regulation

Optimal voltage regulation is attained when the value of voltage is equivalent to all electrical equipment loads. Several factors like voltage regulation, including wire and cable size and type, transformer reactance and cables, motor starter, circuit design, and power factor can affect voltage regulations. However, of these potential obstacles, voltage regulation must be selectable to an accuracy of ±1%.

2. Input Voltage Range

To select the best three-phase AVR specify your input voltage range. The input voltage range should be broad and shifted because line voltages drop more than it increases. This feature entitles to more low correction, rather than high correction. It also authorizes the automatic voltage regulator to be more configurable to all bucks or boost, giving it maximum voltage correction for extreme points.

3. Low Impedance

Impedance is the resistance of a component to the flow of electrical current, measured in ohms. The goal of an automatic voltage regulator is to gain low impedance. Interaction between the load current and source impedance can drive low voltage, harmonic distortion, and voltage unbalance. Ideally, your automatic voltage regulator would get around all of this if it had low impedance.

4. Load Compatibility

Voltage regulation solutions must be consistent with the specified load to ensure their operation and to avoid interfering with the other loads connected to the same power source. High-performing automatic voltage regulators should be able to deal with loads with high starting currents, all power factors, and high crest factors. To prevent fluctuation, the regulator’s speed of response must be prepared to work with the electronic power supplies used in much of today’s equipment.

5. Voltage Accuracy

The primary job of an automatic voltage regulator is to make voltage levels more precise, but what is the optimal accuracy level for the application? Voltage accuracy is dependent on the critical load requirement. Typically, three-phase AVR functions in circuits where voltage regulation can not be achieved by changing the size of the conductor. The five characteristics listed above are critical for a three-phase automatic voltage regulator to perform satisfactorily in demanding applications.

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