Tag Archives: Servo Voltage Stabilizer

Guide to Voltage Fluctuations and why they happen in your Home?

What are Voltage Fluctuations and why do it happen in your home

Before beginning to explore the world of electricity and voltage fluctuations, it is essential to understand the basics of voltage. Voltage is the basic building block of electricity that can help you understand the manipulation and utilization of electricity. Voltage is the driving force of current; it is the electromotive force that pushes free electrons from one atom to another in the same direction. In general, Voltage is the pressure from the power source of an electrical circuit that pushes charged electrons (current) through a conducting loop, enabling them to do work such as illuminating a bulb or fan.

What are Voltage Fluctuations?

Servo Star, the servo voltage stabilizer manufacturer in India explain the term voltage fluctuation, they suggest that amplitude modulations of the fundamental frequency can be referred to as Voltage fluctuations. The below mentioned equation will help you understand better:

Voltage(v), at a given time(t):


Where V represents the RMS voltage, f0 is fundamental frequency, and m (t) refers to modulation. By choosing an appropriate expression for m (t), you can use the previous equation to describe basically any type of voltage fluctuation. For example, if we talk about a sinusoidal voltage fluctuation, you can express the modulation, m(t), by using the given equation:


Where M stands for modulation amplitude, fM is the modulation frequency, and φM refers to initial phase of the modulation.

Well if you are a reader who didn’t understand the scientific explanation, don’t you worry Servo Star a leading servo stabilizer supplier in India who have the right kind of explanation for you:

Voltage Fluctuation is something we have experienced in our homes. The voltage fluctuations can cause lights to flicker, turn off and then on again or glow brighter. Display screen of the computers may flicker as well.  On some occasions when voltage is very low electronic equipment, such as a computer, may fail to start up. So what exactly is voltage fluctuation?

Voltage fluctuation can be seen as a regular change in voltage that happens when devices or equipment requiring a higher load are used. The effects of a voltage fluctuation are similar to the effects of an Undervoltage (when voltage drops below intended level). The challenging part of voltage fluctuations is it can lead to computer systems losing its data, while televisions or radios may experience interference. This power problem may have a consequential effect on the lifespan of incandescent bulbs, since they are designed to be used for a specific voltage.

According to Servo stabilizer manufacturer in India, Servo Star, the effects of these voltage fluctuations can cause some serious problems. Voltages can drop upto 20% of nominal, which can result in exorbitant damage and time consuming errors, loss of important information, recovery and rerun costs and possible equipment damage.

Why Voltage Fluctuations happen in your home?

Already facing the brunt of frequent power cuts, the last thing an individual needs in their house is voltage fluctuations damaging the house appliances equipments like air conditioner, refrigerator or microwave ovens. These effects may be very disturbing and control this situation in your home Servo Stabilizer Suppliers in India share with us the possible causes why voltage fluctuations happen in your home:

  • Wiring Effects

Poorly designed wiring leaves a house with lesser electricity than needed, or it leads to ungrounded wire outlets to leak electricity and cause tough-to-solve power fluctuation issues. Wiring can also get damaged or disconnected by insects and/ or other animals that nest inside the walls. Issues with the house’s wiring create fluctuations when there is increase in energy drawn. A qualified electrician uses certain equipments to identify the problem source and repair the wiring without touching all of the home’s walls. Loose connections in your house wiring and from the circuit breakers to power outlets can also cause voltage fluctuation issues. Another problem can be the use of undersized wires in your house wirings.

  • Flickering

Flickering can occur because of the variations of input voltage sufficient in duration to allow the visual observation of a change in the intensity of electric equipment source. 

  • Notch Filter

Not using a notch filter can be problematic as it is used to remove a particular frequency, having a notch where signals are rejected is very useful. 

  • Overloading

 If where you live, the houses draw more load current than allowed by the authority, then it can lead to low voltage in your area.

  • Frequent use of heavy inductive loads

Another reason could be the use of heavy inductive loads more often, at the same time, such as the air conditioner, refrigerator or motors together. If  heavy loads are used simultaneously, then there can be voltage dip.

  • Natural causes

Striking of Lightning, birds or squirrels on power lines and falling trees all lead to power fluctuations that are difficult to avoid. Where lightning and fallen trees mostly lead to a complete power burnout, the animals or debris hanging on the wires leads to surges in electricity. Surges and swells in electric current often effect computers and other electronics, but Servo Stabilizer Manufacturers in India state, a simple stabilizer deals with the extra electricity before it reaches those devices.

What is Servo Stabilizer?

Servo Controlled Voltage Stabilizer

Is Servo Stabilizer or Servo Controlled Voltage Stabilizer Same ?

Yes, Both are the same thing, Only in some part of the country It is popular as Servo Stabilizer, and in some parts, it is called Servo Controlled Voltage Stabilizer.

Some time even it is called Automatic Servo Voltage Stabilizer also

Servo is an electrical motor that is primarily an integral part of the stabilizer, which controls and stabilizes the output voltage supplied by the voltage stabilizer irrespective of the incoming voltage fed to it.

Accordingly, a few people call it as Servo Controlled Voltage Stabilizer while others go short by calling just as a Servo Stabilizer.

What is a Servo Controlled Voltage Stabilizer? Why should I install one?

A Servo Stabilizer is a Servo motor controlled stabilization system that performs optimum voltage supply using a Buck\Boost transformer booster that captures voltage fluctuations from input and regulates current to the correct output. An AC synchronous motor adjusts voltage in clockwise or anticlockwise direction and manages the output voltage with components like control card,dimmer,comparator, transistors, mocs, etc.

Main Components & their Functioning

There are seven main components in a servo voltage stabilizer:-

1. Dimmer (Variable Transformer)

2. Carbon Brush

3. Servomotor – Synchronizing Motors

4. Buck Boost Transformer (Series Transformer)

5. Contactor or Relay


7. Electronic Circuit

1. Dimmer (Variable Transformer) – It is normally round in the shape. Silicon CRGO toroidal core is used for the base & copper wire with specific turn ratio according to the capacity is used. The basic purpose of dimmer is to increase or decrease the voltage which is fed to the buck boost transformer. 50% of the output voltage is increased or decreased by dimmer only.
Let us take an example: If the input voltage is 160V, the dimmer will increase it to 190V & rest of the 30V (since 220V is required to run any single phase load) will be done by Buck Boost Transformer.

2. Carbon Brush – This is a moving part in servo stabilizer, it is fitted in the shaft to make the contact with dimmer. If the input voltage variation is very frequent, this carbon brush will erase early and customer has to replace it very frequently. That is why servo stabilizer manufacturers should use best quality carbon brush.

3. Servomotor (Synchronizing Motors) – Servomotor as the name suggests is the main part of servo stabilizer. The motor rotates the arm connected on the dimmer in clockwise or anti clockwise direction according to input voltage.Buck-Boost-Transformer

4. Buck Boost Transformer – Contrary to dimmer it is in rectangular shape. Bobin is fitted with EI CRGO core. When the transformer structure is built, it is dipped in varnish tank for extra protection.
This type of Insulating varnish also called transformer varnish is put on all the windings used in buck boost transformers to encapsulate them before the servo stabilizer is ready for regress testing. Transformer varnish enhances coil life and protects windings in the transformer from environmental exposure that would otherwise get damaged due to vibrations. This varnish can be used as a great insulator for any coil of wire. Though transformer is there in Isolation Transformer also, But it different from buck boost transformer

5. Contactor – The function of contactor is to cut the output of any servo stabilizer if it exceeds a prescribed limit.

6. MCB, MCCB – The MCB is used to switch on /off the servo stabilizer and gives short circuit protection whereas MCCB is normally for overload protection.

7. Electronic Circuit – As the name suggests, it sends the signal to various parts of a servo stabilizer like motor, dimmer, etc., so it works according to that signal & does their part to correct the voltage.


These are the main components used in servo stabilizer though there are many other parts also like voltmeter, ampere meter, connectors, etc. Give us your email address to know the functioning of each Component.

The Servo stabilizer has definitely an edge over traditional stabilizers.

Basically there are two types of stabilizers, one is relay based and the other is Servo based.

In relay stabilizer, a switch corrects the output voltage accuracy at ±10%. But in Servo, the primary Servo motor corrects supply using buck-boost function. This type of stabilizer is beneficial for high output voltage accuracy. It provides ±1 % voltage output where input voltage alters up to ± 50 %. This type supports up to 5000 KVA & above so it has a higher load capacity.

Ultimately, the major difference between the two is performance as Servo is a stepless correction technologically superior to traditional relay transformers and gives accurate output.

A Servo Stabilizer is a popular replacement for low high rating appliances used in both commercial and residential places, homes and industries that provides unmatched voltage supply to protect your fragile equipments. Servo has both single-phase and three-phase systems coming in Oil cooled and Air-cooled units.


Why do I use a Servo stabilizer?


A Servo Stabilizer is not just a voltage fixing system, but a completely reliable energy device that is advantageous over the traditional relay based stabilizer. We have quite a number of benefits of using Servo:

1. High voltage correction accuracy with output of ±1 voltage correction.

2. Switch less system to adjust fluctuating voltage at desired levels.

3. High load capacity that supports up to 5000 KVA or above.

4. Voltage is based on step less correction.

5. Perfect stabilization for hospitals best for intricate machineries like X-ray machines, CAT scans, radiation and diagnostic equipments.

6. Wide functioning area from schools, offices, homes and industries.

7. Oil cooled and air cooled transformers that fit your budget.

Eventually, Servo stands the winner because of its unmatched performance and longer life features