Understanding the 3 Types of Automatic Voltage Regulators as Discussed by a Leading AVR Supplier in the Philippines

Almost every establishment has Automatic Voltage Regulators in the Philippines. AVR suppliers have continued to provide the country with some of the highest quality AVRs ever created. For those people who still have no idea what AVRs are, you should know that they are essential in protecting a lot of your electrical appliances.

In the Philippines, AVR suppliers usually offer three kinds of AVRs. Each with its own incredible power and immense usability in almost all aspects of life. Learn more about AVRs and how they could help maintain the life of your electronics by continuing on this article.


What is an AVR?

What is an AVR

An AVR or Automatic Voltage Regulator is a device that is used to regulate voltage automatically—it takes the fluctuating voltage levels of a current and turns it into a constant voltage level. In most cases, the voltage levels fluctuate in a range of -25% to +20%– with AVRs, the range in which these voltage levels fluctuate become smaller, usually around the +/-3% range which is significantly more precise.

The fluctuation in the voltage mainly occurs due to the variation in load from its supply system. This variation can be controlled by installing some equipment that is specialized to control voltage at specific places such as near transformers, generators, feeders, etc. AVRs are provided in more than one point in the power system in order to control the voltage variations.

The basic functions of AVRs are the following:

  1. It stabilizes the output voltage of a generator or any supply system.
  2. It divides the reactive load between the supply system in parallel operation.
  3. It maintains the excitation of the system under fault conditions.
  4. It reduces overvoltage which occurs because of the sudden load of a system.

There are three types of AVRs that are worth mentioning. Each of them has their own strengths and weaknesses—but all of them still do the basic functions and sometimes even more. In order to fully understand the three kinds of AVRs, you must know its inner workings as well as what makes it stand out from the rest. With that being said, here are the three types of AVRs, namely: The relay type AVR, the servo-motor AVR, and the static voltage regulator.


Relay Type AVR

Relay Type AVR

This type of AVR accomplishes voltage regulation through switching relays so as to connect one of a number of tappings of the transformer to the load whether it is for boosting or a bucking operation. It has an electronic circuit and a set of relays besides the transformer. It is comprised of the rectifier circuit, operational amplifier, controller unit and some other tiny yet valuable components.

Within the device, an electronic circuit compares the output voltage with a reference value provided by a built-in reference. When the voltage fluctuates, the control circuit switches the corresponding relay to connect a desired tapping into the output voltage.

These AVRs usually change the voltage from input voltage variations of +/-15% to around +/-6% with an output voltage accuracy of +/-5% to +/-10%

AVR Suppliers in the Philippines would recommend using these kinds of voltage regulators for low rating appliances at home, offices and/or industries because of their relatively low cost and weight.

However, relay type voltage regulators have several disadvantages that make it cower over the other more advanced options available in the market. Overall, relay type AVRs have slow voltage correction speed, are less durable, less reliable, and are unable to withstand high voltage surges.


Servo Motor AVR

Servo Motor AVR

In the Philippines, AVR suppliers recommend this as the go-to option for people who are looking for an AVR for their home, office, or even in industries. This type of AVR is a servo motor controlled stabilization system that provides the optimum voltage supply using a buck/boost transformer booster that captures voltage fluctuations from the input and regulates the current to the correct output. This type of AVR is useful for applications that need an accurate and high voltage accuracy. It can provide a voltage output of +/-1% when the input voltage has a voltage fluctuation rate as high as +/-50%.

In almost all aspects, Servo motor AVRs are better than Relay-type AVRs. It can reach a higher voltage level and an even more precise output. It can also support up to 5000 KVA and above. All of these plus the fact that Servo Motor AVRs are known for their immaculate performance makes these the better options hands down.

A Servo Motor AVR is nothing without its main components. For you to easily identify a servo motor AVR, as well as its parts, here are its 7 main components:

  1. Dimmer (Variable Transformer) – Normally round in shape, this silicon CRGO toroidal core is used for the base and for the copper wire with specific turn ratio according to the capacity that’s used. The purpose of this dimmer is to increase or decrease the voltage which is fed to the buck-boost transformer. At least 50% of the output voltage is manipulated by the dimmer alone.
  2. Buck Boost Transformer – This part is rectangular in shape. The bobbin is fitted with an EI CRGO core. The core is dipped in varnish for an added layer of protection. This type of insulating varnish is put on all the windings used in buck-boost transformers to encapsulate them before the servo stabilizer is ready for regress testing. The transformer varnish enhances the life of the coil and protects the windings in the transformers from environmental exposure that would otherwise get damaged due to vibrations.
  3. Servomotor (Synchronizing Motors) – Servomotor is the main part of the AVR. It rotates the arm connected on the dimmer in a clockwise or counterclockwise direction according to the input voltage.
  4. Carbon Bush – One of the moving parts of the servo stabilizer, it is fitted in the shaft to make contact with the dimmer. If the input voltage variation is frequent, then this brush will get easily worn out. When this happens, it needs to be replaced immediately. As one of the easily worn out parts of the Servo Motor AVR, you should make sure that you are provided with the best quality carbon brushes.
  5. Contactor – This part’s function is to cut the output of any Servo Motor AVR if it exceeds its prescribed limit.
  6. MCB and MCCB – the MCB is used to switch on/off the whole device and it also gives short circuit protection. MCCB is usually a part that protects the device from overloading.
  7. Electronic Circuit – this sends the signal to various parts of a servo stabilizer so it works according to that signal and does their part to correct the voltage.

Just like in any kind machinery, every part has their own function, it won’t be able to work when one of them is missing. That being said, every AVR supplier in the Philippines would recommend you to regularly check your servo motor and exercise regular maintenance.


Static Voltage Regulator

Static Voltage Regulator

This kind of AVR has many similarities with the Servo Motor AVRs except for the fact that it does not have any moving part. Voltage manipulation is achieved purely through the help of electrical circuits. Static voltage regulators are the new generation when it comes to voltage regulators and stabilizers. It is based on the Pulse Width Modulation Technique (PWM).

One of its key features is that it manipulates voltage levels without the need for any kind of distortion in the waveform of the output. Static voltage regulators use an Insulated Gate Bipolar Transistor(IGBT) as power switches. In its case, there is no need for any kind of double conversion where PWM is done.

Since it is filled primarily with circuits, there will be almost no wear and tear of the parts as compared with the servo motor AVRs. Static voltage regulators are known to be even better than servo motor AVRs. Some even saying that these can perform at up to 500 times faster.

As was done with the Servo Motor AVR, to further understand this AVR, it is only natural for you to discuss its major components:

  1. Buck Boost Transformer – The secondary of the buck-boost transformer is connected to the input and output terminal of the voltage regulator. The neutral part in between the input and output of the static voltage stabilizer is common so the voltage that is induced across the secondary of the buck-boost transformer is connected to the IGBT power stage.
  2. IGBT Power Stage – This part consists of the IGBT bridge which is connected to the DSP controller. The IGBT power stage is responsible for generating the appropriate amount of voltage with the help of the PWM technique. The Output voltage of the IGBT bridge is applied across the primary of the buck-boost transformer.

The IGBT bridge can generate voltages at its output—which is applied across the primary of the buck and boost transformer. It can be in phase or 180 degrees out of phase with the input line voltages so that the voltage induced across the secondary of the buck-boost transformer can be added to or subtracted from the input line’s voltages.

  1. DSP Based Control Board – This control board continuously senses the value of the input voltage, output voltage, current load, and the IGBT current with the help of the Current transformer and the voltage transformer connected to it. This information is processed and can give a signal to the IGBT power stage to generate more or less voltage.

Static voltage regulators have the benefit of not having any moving part within their system. Because of this, it needs almost no maintenance of any kind. However, this doesn’t mean that you don’t have to do regular maintenance to it. The best way to keep these static voltage regulators in its top shape would be to keep it clean and tidy.


Why are AVRs Important?

Why are AVRs Important

Now that you’ve been informed about the types of automatic voltage regulators that are recommended for residential, commercial, and industrial use by the top AVR suppliers in the Philippines, you should also know why AVRs are important in the first place. Yes, AVRs are manufactured to regulate voltage that goes into your home, specifically your appliances—but what does this actually entail?

There are a lot of factors that contribute to the need for automatic voltage regulation. The primary reason, however, finances. To avoid the costs that come with equipment damage and downtime that is caused by poor voltage levels.

Every appliance requires a certain amount of voltage. When it receives an amount that is over or under it, then most likely, it will have an effect on the said appliance. Some appliances are very sensitive to voltage, wherein receiving an amount of voltage that is not within the normal range would have a negative effect on the system of the appliance. AVRs help prevent this by, as the name states, regulating the voltage levels to safe and acceptable values.

That being said, voltage levels fluctuate on a regular basis, particularly because of your proximity to local distributors, or probably because of something in the main power system. This is why you have to take note of your appliances, particularly those that are sensitive to voltage levels. Prevent yourself from damaging them by using AVRs!


Meiji Electric: The Leading AVR Supplier in the Philippines

Meiji Electric The Leading AVR Supplier in the Philippines

When it comes to electrical suppliers in Metro Manila, Meiji Electric has been in the electrical business for more than 30 years. We have been well-established as one of the leading companies that deal with electronic supplies.

Whether you’re in need of an AVR supplier or panel board supplier, our company carries electrical controls and distribution equipment and systems, as well as a plethora of other modern equipment. Meiji Electric is bigger than ever before! When it comes to electronics, there’s no better place to look for supplies than Meiji Electric!

If you’re looking for the highest quality AVRs for your home or office, then you don’t have to look any further. With Meiji, you’ll be sure about every piece of electronics that you’d get!

Click here to learn more about our different products and services!

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