500 kVA Servo Voltage Stabilizer
Enterprise-scale 500 kVA servo voltage stabilizer designed for large manufacturing plants and industrial complexes. Delivers unmatched voltage stability with servo-motor precision and robust overload handling.
Ref. SVS-500-3PH · Lead time 3–4 weeks · Made to order from Hapur
See full engineering specification & variants
Key Features
Recommended For
Specifications
| Specification | Value |
|---|---|
| Capacity | 500 kVA |
| Input Voltage | 300V–470V, 3-Phase |
| Output Voltage | 415V ±1% |
| Frequency | 50/60 Hz |
| Response Time | < 20 ms |
| Cooling Method | both air and oil cooled |
| Weight | 1965 kg |
| Warranty | 3 years |
Reading the specification
What these numbers mean for your installation
A datasheet tells you what the unit does. This is what each figure changes about how you specify, feed and site it — worked out for the 500 kVA specifically, not the range in general.
696 A per phase
At 415 V three-phase, 500 kVA works out at roughly 696 A per phase. At 696 A cable becomes awkward and expensive; most installations at this rating land on a busduct or a bolted busbar connection straight from the LT panel. Size the neutral deliberately as well — with the non-linear loads typical at this scale, triplen harmonics can put more current in the neutral than in any phase.
300V–470V
The unit holds output at 415V ±1% anywhere between 300 V and 470 V in. Pulling a 300 V supply back up to 415 V means adding 115 V — a 38% lift on the incoming supply, with the series winding carrying roughly 139 kVA of the 500 kVA throughput. Below 300 V it runs out of range, and the answer is a wider-window build, not more kVA.
< 20 ms
< 20 ms across a plant-level load means the servo is tracking a constantly moving target — every shift change and every large start moves it. Correction this fast is what keeps the whole facility inside tolerance rather than just the sensitive end of it.
150% overload tolerated for 30 minutes — covers motor-starting surges without derating
Direct-on-line starting draws six to eight times full-load current for a few seconds, and 150% overload tolerated for 30 minutes — covers motor-starting surges without derating is the margin that absorbs it. At 500 kVA the practical constraint is usually the largest single motor rather than the total: size against that starting current, not against the sum of the nameplates.
Sizing Guide
When is 500 kVA the right choice?
500 kVA is the standard rating for large integrated manufacturing floors — think a 15,000 sq ft plastics injection plant running 8–10 machines simultaneously, or a textile mill with multiple rapier looms, humidifiers, and overhead cranes on the same feeder. At this scale, a relay-type stabilizer or static AVR cannot keep up with the rate of load change; servo motor technology is the only reliable option. The 500 kVA unit also serves as the incomer stabilizer for multi-tenant industrial estates where the landlord wants to provide clean power to all tenants from a single point. Oil cooling is standard at this rating — the heat dissipation from a 500 kVA unit in continuous duty exceeds what any air-cooled enclosure can manage reliably.
Before you order
Where 500 kVA goes in, and what the site needs
Typical installations
We supply 500 kVA most often into plastics injection plants (8–10 machines), textile mills — rapier looms, humidifiers, overhead cranes, multi-tenant industrial estate incomers and steel re-rolling & fabrication units, alongside chemical process plants and power distribution substations. What separates those sites is duty cycle rather than load. A rating that runs cool on single-shift work sits near the top of its thermal range on a continuous three-shift line, and that is the point at which oil cooling stops being optional.
Site preparation
At 1,965 kg you are into hydra or gantry territory for the final lift, onto a plinth cast for the purpose. The unloading point matters as much as the destination: plan where the truck stands and how the 1,965 kg travels the last few metres, because that gap is where most delivery-day problems happen. Leave working clearance on the terminal side for cable entry and inspection. Sustained ambient above 45 °C, or an enclosed room without cross-ventilation, requires derating — send us the room conditions and we will confirm the rating still holds where you intend to put it.
Adjacent ratings
If 500 kVA is not the right size
Sizing rarely lands exactly on a catalogue rating first time. These are the ratings either side of it in the same range — compare the specification before you commit.
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View specificationEngineering detail on this configuration
The servo voltage stabilizer pages carry the full design rationale, comparison tables and application notes behind this SKU.
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