Research & Development

COSMOSTAT R&D team has always kept us ahead by developing innovative products for uses in various domestic & industrial applications.

What is a voltage stabilizer?

A voltage stabilizer is a device that delivers stable voltages. Every regulator is designed for a specific voltage band. As long as the input voltage is within that band, it will correct it and ensures constant voltage at its output. Thus, it offers protection to the devices connected to it from voltage fluctuation. It also enhances equipment lifespan.

Why do we need a voltage stabilizer?

Power coming from the utility grid is not always pure, stable, and safe. It has Sag, Swell, overvoltage, overcurrent, spikes, and surges. All these compromises power quality. Every machine demands a pure power supply. Thus, a voltage stabilizer helps to supply fluctuation-free voltages. It stops all power impurities and protects your load.

What are the different types of stabilizers?

Based on the working principle, there are three types of voltage stabilizers. Servo, relay, and static systems are three types. Everyone has its advantages and disadvantages.

It is a voltages stabilizer working on the servo motor controlled mechanism. A servo voltage stabilizer consists of an autotransformer or dimmer, buck-boost transformer. Also, it has a servo motor with an electronic circuit. The primary side of the buck-boost transformer is fed by a dimmer. A rotating arm with a carbon brush is connected to the servo motor, and it can change the number of turns of the dimmer. So, when low or high voltages are at the input, the electronic circuit gives a single to the servo motor. Servo motor moves the arm to increase or decrease the turn of the dimmer, and hence primary voltage of the buck-boost transformer changes. As a result, the buck-boost transformer can adjust the output voltage to keep it stable.

Distribution transformers are the last port of call on a distribution grid. The grid will soak up high amounts of electrical energy and distribute it accordingly for the customer, be it household or commercial use. The distribution transformer is responsible for outputting the correct voltage. It converts the voltage from the transmission lines and delivers it for domestic or industrial usage.


Due to the fact that a distribution transformer has no moving parts, the concept of how it works is fairly simple… The main body of the transformer houses two or more coils of insulated wires wound on a steel core. As soon as voltage is introduced to one of the coils (Primary/Input Coil), the core magnatises. As a result, voltage transfers into the other coil (Secondary/Output Coil). It’s down to the turn ratio of the two coils to determine the change in voltage levels and final distribution.

As we know, distribution transformers are used for the correct distribution of electrical energy to the necessary consumer. Typically, distribution transformers are needed to manage the voltage output (often at a low level). For instance, industrial purposes may require a low voltage of less than 33KV whilst more domestic users only need between 220v-440v. Not only do distribution transformers help to distribute the correct levels of energy but they combat energy waste and core losses too – critical for today’s climate

Depending on the type of distribution transformer, they can be squeezed in to the tightest of spaces; generally, you’ll find them in open and expansive spaces on solar or wind farms, for example. Generally, you will see two different types of distribution transformer: pole mounted (if transmission lines run above ground) and pad mounted (transmission lines underground).

Power transformers are utilized in transmission networks with significantly higher voltage, while distribution transformers function in distribution networks defined by lower voltages. As a leading power and distribution transformer manufactures in Chennai contact us for more information.

A distribution transformer is a common type of transformer used in the electric power distribution system that receives energy from higher voltage levels, transforms, and distributes this energy to the lower voltage level needed for the application. To know more about distribution transformer manufacturers check out our website now.

Compact substation is one kind of compact complete set of distribution equipment that combines medium voltage switchgear, low voltage switchgear, distribution transformer, energy metering devices and reactive power compensation devices into boxes according to a certain wiring scheme. It is also called as prefabricated substation, box type substation, miniature substation, package substation and so on. Compact substations are normally suitable for residential quarters, public utilities and construction power supplies.

Transformer hum or transformer noise is caused due to the repeated expansion and contraction of the steel core inside the transformer. The expansion of core depends on the amount of flux, which in turn depends on the applied voltage and number of turns of transformer coils. The magnetic flux passing through the transformer core varies continuously which expands and contracts the core.

A tap changer is used to regulate the output voltage of a transformer. The variations in load on the transformer can result in minor variations in the output voltage of a transformer. This can be rectified using a tap changer. The output voltage can be either increased or reduced by a margin of 10% using tap changer.

All transformers are rated in kVA for the following two reasons: The transformers do not alter the power factor of the supply. The power factor of the input supply and that of the output are always the same. All losses occurring in the transformers are independent of the power factor of the input supply.

When a transformer is turned on for the first time it draws a current several times its rated current. It is instantaneous and last for a few cycles of input supply until the steady-state flux is reached.

Core losses, also known as constant losses are those losses occurring in the laminated steel core of the transformer. These losses do not vary upon load and remain constant for any particular transformer. These losses result from the variation of magnetization of core throughout the cycle of AC supply. Core losses are sometimes referred to as iron losses and two primary kinds of core losses are Hysteresis losses and eddy current losses.

To calculate the required capacity of the voltage regulator, we need to add up the KVA, KW, or Amp rating of all loads that you want to connect to that regulator. For single-phase load, we can calculate KVA capacity can by multiplying voltage to the current requirement of that load. Similarly, we can get a KVA rating for three-phase loads by multiplying line voltage to line current and multiplying the result by three. Once you calculate KVA for each device at your facility, add them to get the total required rating of the voltage stabilizer.

In order to reduce core losses, transformers are designed using better grade steel (normally Cold Rolled Grain Oriented –CRCO). Also using laminated cores especially, thinner core laminations can help in achieving better transformer efficiency by reducing core losses.

IS 1180 : 2014- For Distribution Transformer (used for auxiliary purpose i.e. output voltage of 433V) IS 2026 : 2011- For rest of the special purpose Transformer types (Windmill, Solar, Furnace etc.)

For Distribution Transformers with IS 1180 : 2014 Total loss at 50% and 100% loading- No tolerance and quoted as maximum w.r.t standard ratings % Impedance- Tolerance is applicable as per IS 2026 : 2011 For Special Purpose Transformers with IS 2026 : 2011 No Load loss, Load loss and % impedance - Tolerance is applicable as per IS 2026 : 2011