Three Phase Oil Cooled Servo Stabilizer

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Overview

Three Phase Oil Cooled Servo Voltage Stabilizer

Ensure Uninterrupted Power for Your Industrial Operations

A three phase oil cooled servo stabilizer keeps a steady 415 V (±1%) on all three phases for heavy industrial and commercial loads; 380 V or 400 V output is available on request.

Its buck-boost transformers are sealed in transformer oil, which keeps the stabilizer cool enough to run on full load 24 hours a day. It is the standard choice for heavy loads in Indian industry, and SERVOLINK builds it from 25 kVA right up to 2000 kVA.

Factories run their CNC machines on it, hospitals run MRI and CT, and malls run their central ACs on it. That is why buyers search for it by many names — industrial servo stabilizer, heavy duty servo stabilizer, CNC machine servo stabilizer, lift servo stabilizer, chiller servo stabilizer, hospital servo stabilizer. All of them are this one machine, built for your load.

This is the solution for any load, any size, and input as low as 100 V per phase. It also gives the most customisation of any servo we make, and every unit is built fully in-house at our Ghaziabad facility, where we have been making stabilizers since 1980.

Engineered and manufactured entirely by Servolink for superior quality and unmatched reliability and performance.

Servolink three phase oil cooled servo voltage stabilizers

At A Glance

Key Facts

Capacity25 kVA up to 2000 kVA, custom ratings on request

Output415 V ±1% phase to phase
230 V ±1% phase to neutral

Input240-470 V, 300-470 V or 340-470 V; custom down to 100 V per phase

DutyContinuous, 24×7, full load

Build100% copper variac, in-house CRGO buck-boost transformer, IS 9815

On big sites, the voltage problem does not come only from the grid. A long LT cable from the transformer to the far end of the plant, heavy motors starting one after another, and a feeder shared with other industries all pull the voltage down in their own way — like in an industrial area at 9 in the morning, when every factory on the line starts its machines at the same time. Our stabilizer corrects each phase separately, so the machines at the far end of the shop floor get the same voltage as the ones next to the panel.

From a 25 kVA unit for a small workshop to a 2000 kVA unit for a full plant, the control logic and the servo correction stay the same. Only the size of the variacs, the transformers and the tank grows with the load.

The Problem

Why Big Three Phase Loads Need Stabilization

For a large site, low voltage is not only a grid problem. The voltage drops along the LT cable as the load increases, so the panels far from the transformer get less voltage than the main panel. When big motors start, the voltage dips for a few seconds on the whole network. In industrial areas, the feeder voltage also changes with the shift timing of the factories around you, and the DG set voltage changes with its load.

At high kVA, every small voltage problem becomes a big cost. Motors run hot and their insulation ages faster, VFDs and PLCs trip in the middle of a batch, and medical and lab equipment gives errors or stops. One breakdown on a production line can cost more than the stabilizer itself.

Engineering

Features

Unwavering Three-Phase ProtectionEnsures consistent and reliable voltage across all three phases, safeguarding your industrial equipment and optimizing performance in complex electrical systems.

Advanced Servo TechnologyPrecisely regulates voltage fluctuations in each phase, preventing imbalances that can damage sensitive machinery.

Oil-Cooled DesignProvides superior heat dissipation for quieter operation in demanding environments, even under heavy loads.

Extended LifespanOil-cooled technology promotes efficient heat management, contributing to longer product life and reduced maintenance requirements compared to air-cooled models.

Customized SolutionsAt Servolink, we understand that every business has unique power requirements. That's why we offer tailored solutions to match your specific needs.

Wide Input Voltage RangeAdapts to fluctuating power conditions, offering unwavering stabilization for a wider range of industrial applications.

Robust ConstructionBuilt with high-quality materials and rigorous quality control to withstand the rigors of industrial environments.

Alarm SystemProvides audible and visual alerts for potential issues, allowing for preventive action and minimizing downtime.

The Right Fit

Where Is A Three Phase Oil Cooled Stabilizer Used?

Wherever the load is heavy and the machines cannot stop. Manufacturing plants with CNC, laser cutting, injection moulding, printing and textile machines; steel and fabrication shops; hospitals with MRI, CT and X-ray machines; data centres and telecom sites; cold storages, water treatment plants, malls, commercial towers, banks and government buildings. In all these places the load runs for long hours, and a breakdown means a loss of production, service or money.

Why choose an oil cooled model? If your load is above 100 kVA, or the load runs near its rating all day, or the stabilizer has to be placed at a site that is hot, dusty or semi-outdoor, then the oil cooled model is the right choice. The oil keeps the transformers cool under full load, protects the windings from dust and moisture, and gives the stabilizer a long working life even in tough site conditions.

Main USPs

Three Phase Oil Cooled Variants

Built For 24×7 DutyRuns full shifts and round the clock without getting overheated.

Wide Capacity RangeFrom 25 kVA to 2000 kVA, so one stabilizer can protect a complete plant from the main LT panel.

Higher Overload CapacityHeavy motor starting, compressors and lifts are handled easily.

Sealed In OilDust, moisture and the heat of an industrial site do not reach the transformer windings.

Made In Our Own FactoryCRGO core buck-boost transformers and copper wound variacs, so we control the quality from the first turn of winding.

How It Works

Working Mechanism

R, Y and B each have their own variac, buck-boost transformer and servo motor. The control card reads the input and output of every phase, and runs that phase’s motor forward or in reverse to move its carbon brush along the variac. The buck-boost winding then adds or subtracts exactly the correction needed. Follow the numbers in the diagram below.

Tap the diagram to open it full size

Mains inputR, Y, B supply enters through the 3-pole MCB.
SensingThe control card reads the input and output of every phase.
Range checkIf any phase goes beyond the low or high cut, the contactor cuts off the output.
Motor driveThe card runs that phase’s servo motor forward or in reverse.
Brush movesThe motor turns the carbon brush on that phase’s variac.
Buck or boostThe variac feeds the BBT primary and input. The secondary-output winding adds or subtracts voltage in series.
Stable outputCorrected R, Y, B voltage passes through the contactor to the output terminals.

Technical Data

Specification

Brand	SERVOLINK
Product Type	Three Phase Oil-Cooled Servo Voltage Stabilizer
Capacity	25, 30, 40, 50, 60, 75, 100, 125, 150, 200, 250, 300, 400, 500, 600, 750, 1000 kVA and up to 2000 kVA; other ratings on request
Supply System	Three phase, 4 wire (R, Y, B + neutral), with protective earth
Input Voltage Range	240-470 V / 300-470 V / 340-470 V (phase to phase), as per selected model; custom ranges with input as low as 100 V per phase on request
Output Voltage	415 V ±1% phase to phase (230 V ±1% phase to neutral); 380 / 400 V on request
Frequency	50 Hz
Control Type	Independent phase control (unbalanced type)
Mode of Operation	Automatic, servo-controlled
Duty Cycle	Continuous, 24 hours
Efficiency	More than 98%
Variac	100% copper wound, made in-house
Buck-Boost Transformer	CRGO core, copper wound, made in-house
Cooling	Oil-cooled, buck-boost transformers dipped in transformer oil
Oil Level Indicator	Provided on the tank
Installation	Indoor and outdoor (under shed)
Ambient Operating Temperature	Up to 50°C
Display	LCD display panel on all models
Voltage Protection	High/low voltage cut-off on all models
Phase Protection	Single phasing and phase reversal protection
Overload / Short-Circuit Protection	As per selected model
Restart Delay	Provided on all models
Switchgear	Lauritz Knudsen (L&T) MCB and MNX contactors
Bypass	Heavy duty rotary cam bypass switch, rated as per design
Mobility	Iron wheels on smaller ratings; base channel on higher ratings
Standard	Built as per IS 9815 (Part 1):1994, IS 5142, IS 302 (Part 1)

Questions

Frequently Asked Questions

Why are big servo stabilizers mostly oil cooled?

As the kVA goes up, the heat produced inside the transformers also goes up. Air alone cannot take away this heat in a compact size, but transformer oil can. That is why most stabilizers above 100 kVA are oil cooled, and oil cooled is also the better choice for smaller ratings that run on full load all day.

Where should the stabilizer be connected in a factory?

It is connected on the LT side, after the main transformer or the main LT panel and before the load distribution panels. If the whole plant needs protection, put it at the main incomer. If only a few sensitive machines need it, a smaller stabilizer can be placed on that section’s feeder.

Is one big stabilizer better or many small ones?

One big stabilizer at the main incomer is simpler to install, gives the whole site stable voltage, and needs one place for maintenance. Separate smaller stabilizers make sense when machines are in different buildings, or when only some machines are sensitive. We study your single line diagram and suggest what suits your plant.

Can it be installed outdoors at the plant?

Yes. Place it under a proper shed, on a raised concrete plinth so rainwater cannot reach the tank, and keep enough space around it for service and air flow. Bring the cables through a proper trench or cable tray.

Can it handle VFDs, compressors and lift motors in the plant?

Yes. Share the list of motors and VFDs with their kW ratings and starting method, because direct-on-line starting draws a high current for a few seconds. We size the stabilizer so it handles the starting current without tripping.

What maintenance does a big oil cooled stabilizer need?

Check the oil level and the breather regularly, test the oil (BDV) once a year, check and replace the carbon brushes when worn, tighten all power terminals, and clean the dust from the control section. Under our AMC, our technicians do all of this at your site on a fixed schedule.

Can it work with the plant’s DG set?

Yes. Connect it after the changeover, so both grid and DG supply pass through it. The restart delay lets the DG settle before the output switches on, and the stabilizer keeps the voltage steady as the DG load changes.

Why choose a SERVOLINK three phase oil cooled servo stabilizer?

We have been making stabilizers since 1980, and every major part is made under one roof at our 16,000 sq ft factory in Ghaziabad: CRGO core and buck-boost winding, 100% copper variac winding, variac motorization, tank fabrication, assembly and testing, each in its own workstation. Our servos are built as per IS 9815, IS 5142 and IS 302, and every unit is tested in our own testing section before dispatch. Our oil cooled stabilizers are running at hospitals, banks, research institutes, telecom sites and government power plants.

For loads up to 100 kVA in a clean, covered electrical room, our three phase air cooled servo stabilizers may be a better fit.

The Difference