200 kVA Oil-Immersed Transformer: Preferred Choice for Small-Scale Industrial Power Distribution in 2026
Feb 03, 2026
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Why 200 kVA Fits Small-Scale Industrial Power
The 200 kVA oil-immersed transformer is a widely selected rating for small factories, workshops, commercial complexes and agricultural facilities. It provides enough capacity for motor loads, lighting and heating without the capital cost of larger units, and it fits standard distribution voltages such as 10 kV/0.4 kV with Dyn11 connection. For 2026 planning cycles, energy-efficiency regulations make low-loss S13 and S22 units the practical baseline.
Technical Reference Data
| Parameter | Value |
|---|---|
| Rated power | 200 kVA |
| HV voltage | 6/6.3/10/10.5/11 kV typical |
| LV voltage | 400/230 V |
| Vector group | Dyn11 or Yyn0 |
| Cooling | ONAN |
| No-load loss (S13) | 215 W |
| On-load loss (S13) | 2080-2185 W |
| Impedance | 4% |
Energy Efficiency in 2026
New installations should compare the capitalized cost of losses: a transformer runs continuously, so no-load loss dominates operating cost. S13 reduces no-load loss by about 10-15% versus S11, and S22 goes further, aligning with tightened efficiency targets such as GB 20052 and the EU Ecodesign regulation for distribution transformers.
Design and Protection Features
The unit uses a fully sealed corrugated tank, step-lap grain-oriented core, concentric windings with oil ducts, pressure relief valve and optional gas relay and temperature monitoring. These features support long life in dusty or humid industrial environments.
Application Guidance
Small and medium manufacturing plants.
Commercial and mixed-use buildings.
Rural and suburban distribution nodes.
Backup or site power at 200 kVA scale.
FAQ
How much load can a 200 kVA transformer carry?
At unity power factor it can supply 200 kW continuously; at 0.8 power factor about 160 kW, within the rated temperature rise.
Should I choose S11, S13 or S22?
Choose by the loss budget and payback period: S13 balances first cost and efficiency for most projects, while S22 suits utilities or sites with very high load factors.
Can it handle motor starting currents?
Yes, transformers withstand inrush and starting currents, but frequent heavy starts should be checked against the unit's short-circuit and thermal capability.
What is the typical delivery lead time?
Lead time depends on the manufacturer's schedule and configuration; standard ratings are usually produced faster than customized voltages or tap arrangements.
How is efficiency calculated?
Efficiency is output power divided by input power; at rated load it typically exceeds 98% for a 200 kVA S13 unit, with peak efficiency near 50-75% load.