What is an Automatic Voltage Regulator (AVR) and why do diesel generators need one?

Abstract: Diesel generators are very important complex machines, especially when used in work sites or buildings. They are an essential tool in emergencies, providing you with continuous and stable power in the absence of a grid. However, there is still a lot that is not known about diesel generators, especially the importance of automatic voltage regulators. This article will explain AVR and its importance in more detail.


An AVR is a solid-state electronic device used in diesel generators that automatically maintains the generator output voltage at a predetermined level. The voltage level in the generator can fluctuate, especially when the load or operating temperature fluctuates, and the AVR, which is part of the alternator excitation system, is used to neutralize the output voltage. It stabilizes the output of the generator, which often has inconsistent loads, but can also split the reactive load between multiple generators operating in parallel (called voltage sag) and can assist the generator in case of overload.


Although small, and its appearance resembles that of a computer's motherboard, the AVR can control the output by electronically sensing the voltage emitted by the generator terminals and comparing it to a predetermined voltage level. It then sends an error signal to the exciter stator, which is used to adjust the excitation current (by increasing or decreasing the current), and the exciter stator adjusts the terminal to a higher or lower flow rate.


In short, an constantly monitors and adjusts the voltage of a generator or used generator to maintain a fixed voltage level.


But why is AVR important for generators?


Diesel generators that are not equipped with an AVR and are considered unregulated, they often have problems meeting the power requirements required for the equipment or equipment connected to the generator. If you work closely with generators, you know that one generator may need to power multiple devices or machines.


Many non-regulated generators without AVR cannot regulate the voltage output on their own, so if more devices and machines require power - the more voltage output is required - the terminal voltage will gradually decrease, meaning that the connected devices will not have enough power voltage to be fully powered. The use of an AVR is critical for generators because if the voltage output is constantly changing or decreasing, rather than being maintained at a fixed predetermined level, this can affect the performance of the generator and the equipment connected to it.


The automatic voltage regulator also helps to keep the output terminals at a safe voltage level and can provide surge protection. Without an AVR, a generator may output a terminal voltage that is too high for the device or machine it is powering, which could overload that device. Not only can this damage the connected device, but it can be very dangerous, leading to an electrical fire or electric shock. AVR helps generators adjust voltage levels during overload to prevent electrical short circuits.


The use of an AVR increases the efficiency of the generator and extends its service life, including the equipment connected to the generator. It monitors the voltage output to ensure consistent levels. Without AVR , voltage levels can fluctuate wildly, damaging machines or causing problems at a business or job site.


Parts for automatic voltage regulator (AVR)


The automatic voltage regulator is a small but powerful device with many advantages. AVR is often combined with other power quality capabilities, such as surge suppression and prevention, short circuit prevention, voltage balancing, line noise reduction, and harmonic filtering.


An AVR is a complex device that does more than just meet the eye and is made up of many precise components, including contact voltage regulators, transistor regulators, and computer-controlled regulators. All of these parts together make the AVR an important configuration for generators. However, the typical purpose of an AVR is to automatically adjust the output voltage of a generator.


If the generator's voltage is not maintained at a constant fixed rate, the overall performance of the generator may be negatively affected, and any utility, equipment, or machinery powered by the generator may also be negatively affected by an unregulated generator.


The AVR is directly related to the performance and life of the generator and the project that the generator is powering, and ensures that the output voltage output remains consistent in its load current even if fluctuations occur in the background. This helps mitigate or even eliminate any damage that fluctuations can cause to appliances, machinery, fixtures, and equipment.


Summary: The most important function of an AVR is to automatically control the generator voltage and keep the output within the appropriate voltage level range of the generator, regardless of the current consumed by the load. AVR not only helps to adjust the voltage to a safe level, but also provides surge protection against power surges, spikes, and generator overloads. Helps generators respond and handle overloads to prevent short circuits, and also distributes reactive loads between generators operating in parallel. If you need it, you can contact us and we can provide you with quality guaranteed products.


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