100 kVA 3-Phase Servo Voltage Stabilizer
Engineered for CNC lines, injection molding, textile mills, and heavy automation — delivering ±1% output accuracy and continuous 80 kW active load capacity under fluctuating industrial grid conditions.
Technical Specifications
Complete parameter sheet for the 100 kVA three-phase oil cooled servo voltage stabilizer, built for industrial duty cycles and wide input voltage fluctuation.
| Parameter | Specification |
|---|---|
| Rated Capacity | 100 kVA (100,000 VA / 80 kW at 0.8 PF) |
| Input Voltage Window | 300V – 480V AC Three-Phase (Custom 280V–480V available on request) |
| Output Voltage & Accuracy | 415V AC ± 1% Line-to-Line |
| Phase Configuration | 3-Phase, 4-Wire (Star / Neutral) |
| Cooling Type | Oil Cooled (ONAN – Mineral Oil per IS 335 / IEC 60296) |
| Correction Speed | 45V / second |
| Response Time | < 30 milliseconds |
| Efficiency | 98.5% at full load |
| Insulation Class & Enclosure | Class H (180°C), IP54 Enclosure |
| Protection Features | Over/Under Voltage Cutoff, Overload, Short Circuit, Phase Reversal, Single Phasing Preventer |
| Compliance Standards | IS 9815:2018, IS 14697:2022, IEC 61000 |
How a 100 kVA Servo Voltage Stabilizer Works
A continuous closed-loop correction system built on three coordinated stages: sensing, mechanical actuation, and series transformer correction.
Continuous Microcontroller Sensing
A dedicated microcontroller continuously samples all three input phases at high resolution, comparing instantaneous RMS voltage against the 415V ± 1% setpoint. Any deviation — sag, surge, or phase imbalance — is detected within milliseconds and converted into a correction command sent to the servo drive circuit.
Servo Motor Actuation
The correction signal drives a precision servo motor coupled to a carbon-brush roller assembly riding on the buck-boost autotransformer winding. The motor rotates the roller along the winding to physically adjust the tapping point, achieving smooth, stepless voltage correction rather than the discrete jumps seen in relay-based stabilizers.
Buck-Boost Series Correction
The repositioned tap changes the turns ratio of a series buck-boost transformer wired in-line with the load. This transformer either adds to (boost) or subtracts from (buck) the incoming line voltage, delivering a stabilized 415V output to connected machinery — all while the unit remains fully immersed and cooled in mineral oil.
Industrial Applications
The 100 kVA capacity band is specifically sized for medium-to-large industrial loads where voltage-sensitive electronics and motor drives operate on a shared feeder.
CNC Machining Centers
Protects servo drives and spindle controllers from voltage transients that cause positioning drift and tool-path errors.
Injection Molding Machines
Stabilizes supply to heater bands and hydraulic servo pumps, maintaining consistent melt temperature and cycle repeatability.
Textile Mills
Supports looms, spinning frames, and drive motors across long production runs where voltage sag directly affects yarn quality.
Medical Imaging Equipment
Delivers the tight regulation required by CT, MRI, and X-ray systems where voltage instability can affect imaging accuracy and equipment safety.
Heavy Industrial Automation
Protects PLC racks, VFDs, and robotic cells from grid fluctuations common in industrial estates with shared transformer loading.
HVAC & Compressor Plants
Prevents motor overheating and premature winding failure caused by chronic undervoltage on large compressor motors.
Air Cooled vs. Oil Cooled — 100 kVA Comparison
At 100 kVA, thermal management becomes a decisive factor in unit longevity and overload tolerance.
| Parameter | Air Cooled | Oil Cooled (Recommended at 100 kVA) |
|---|---|---|
| Thermal Buffer Capacity | Low – heat dissipates only via forced air over windings | High – oil mass absorbs and evenly distributes heat load |
| Enclosure Protection | Typically IP23 / IP42 | IP54 – sealed against dust and moisture ingress |
| Overload Tolerance | Limited short-term overload margin | Higher short-term overload tolerance due to oil thermal inertia |
| Dielectric Insulation | Air-insulated windings | Oil-insulated windings — superior dielectric strength |
| Maintenance | Requires periodic fan and filter maintenance | Requires periodic oil quality testing; fewer moving parts |
| Suitability at 100 kVA | Better suited to lower kVA, cleaner indoor environments | Recommended for 100 kVA+ continuous industrial duty |
Compliance & Standards
Manufactured and tested against applicable Indian and international standards for voltage regulation equipment.
Frequently Asked Questions
Technical answers to the most common questions on 100 kVA servo voltage stabilizers.
What is the maximum kW load a 100 kVA servo stabilizer can handle?
Why choose Oil Cooled over Air Cooled for a 100 kVA unit?
How does ±1% voltage accuracy protect CNC and automated machinery?
What protection systems come standard with this unit?
Request a Factory Quote on the 100 kVA Servo Voltage Stabilizer
Speak directly with our engineering team for site-specific load calculations, delivery timelines, and pricing.