Distribution Transformers
10 KVA – 2,500 KVA | Up to 33 kV | IS 1180 / IEC 60076 | BIS Star Rated
10 KVA – 2,500 KVA | Up to 33 kV | IS 1180 / IEC 60076 | BIS Star Rated
Marsons manufactures a comprehensive range of oil-immersed distribution transformers for utility, industrial, and commercial applications — in single-phase and three-phase configurations. Available in free-breathing, conservator-type, and hermetically sealed variants. BIS approved and type tested for energy efficiency compliance up to Level 3.
| Parameter | Value / Description |
|---|---|
| Rating Range | 10 KVA to 2,500 KVA |
| Number of Phases | Single-phase and three-phase |
| Voltage Class | Up to 33 kV (HV side) |
| HV Winding Voltages | 3.3 kV, 6.6 kV, 11 kV, 22 kV, 33 kV (standard) |
| LV Winding Voltages | 433 V (3-phase) / 240 V (single-phase) and others as specified |
| Frequency | 50 Hz standard | 60 Hz on request for export |
| Vector Group | Dyn11, Yyn0, Dzn0, Yzn11 and others per IS / IEC |
| Applicable Standards | IS 1180 Parts 1 & 2, IEC 60076, ANSI, IEEE |
| Insulating Fluid | PCB-free Mineral Oil per IS 335 / IEC 60296. FR3 biodegradable on request. |
| Insulation Class | Class A (maximum hot-spot temperature 105°C) |
| Temperature Rise | Oil: 50°C max | Winding: 55°C max above 40°C ambient |
| Cooling Class | ONAN standard | ONAF on request |
| Tap Changer | OCTC: ±2 × 2.5% standard | OLTC on request |
| No-Load Losses | Per IS 1180 BIS Star Rating — Level 1, Level 2, Level 3 compliant |
| Load Losses | Per IS 1180 guaranteed loss levels. Test certificate supplied with each unit. |
| Impedance Voltage | 4–6% standard | Custom values on request |
| Sealing Options | Free-breathing with silica gel breather | Conservator-type | Hermetically sealed |
| Standard Fittings | Oil-level gauge, dial thermometer, drain valve, sampling valve, pressure relief device, rating plate |
| Optional Fittings | Buchholz relay, OTI, WTI, marshalling box, conservator with silica gel breather |
| Type Tests | BIS approved. Type tested at NABL accredited laboratory. Energy efficient up to Level 3 per IS 1180. |
MARSON operates a state-of-the-art manufacturing facility dedicated to building high-performance power transformers. From high-grade materials to rigorous quality control, our entire production line is optimized for reliability, longevity, and efficiency.
Our robust round core construction uses cold rolled silicon steel and secure clamping to prevent movement, support windings, and boost short circuit strength.
Our dedicated core coil assembly area meticulously constructs the transformer's vital active part, defining its insulation scheme, cooling, and dynamic withstand capabilities.
The core and coil form the vital active part of our transformers. Utilizing cold-rolled, grain-oriented silicon steel, our robust construction defines the insulation scheme, optimizes cooling, and guarantees superior dynamic withstand capabilities during operation and transport.
Precision is paramount. By maintaining an isolated, clean winding environment, we ensure extremely low impedance variation. Furthermore, our advanced vacuum drying technology cuts drying times by over 50%, passing those time savings directly to your delivery schedule.
Housed in a pristine, enclosed room, our winding department uses vertical and horizontal machines to ensure tight tolerances and low impedance variation.
Our highly effective vacuum drying process ensures perfect dryness and extends the transformer lifespan, while significantly shortening production cycles and delivery times.
From standard distribution to specialized power transformers, explore our robust, precision-engineered solutions designed to meet your exact energy infrastructure requirements.
A quality policy is a reflection of the endeavors and aims of the organization. Quality has always been a benchmark at Marsons.
Our uncompromising stance on quality and strict adherence to ISO 9001:2008 standards furnish our customers with the very best and reliable products.
To maintain these rigorous standards, our quality control activities are seamlessly integrated into every stage of the production cycle.
These core activities can be summarized as: custom order management, a strict approval system for all vendors, uncompromising manufacturing supervision, and comprehensive testing and inspection.
Our testing departments, utilizing high-end equipment, play a decisive role in the implementation of our quality program. We operate two laboratories, both equipped with modern machinery and precision instruments.
To ensure the highest accuracy, tests are conducted separately. One laboratory is strictly allotted for high/medium voltage transformers, and the other for medium/low voltage transformers.
Our quality is backed by accredited infrastructure. Our fully equipped NABL accredited laboratory can efficiently carry out all required routine and type tests, including Impulse lightning tests and Temperature rise tests.
This facility allows us to rigorously test various ratings of Power Transformers up to the range of 200 MVA 220 kV class using various conventional, state-of-the-art, and modern equipment.
Ready to power your infrastructure? Contact our experts today to discuss our wide range of ISO-certified distribution and power transformers, backed by 65 years of industry trust and credibility.
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