High-Performance Converter & Rectifier Duty Transformers

Urja Techniques (India) Pvt. Ltd. is a premier global manufacturer and exporter of custom-designed Converter Duty Transformers with capacity up to 15 MVA and voltage ratings up to 33 kV. Established in 1991, our ISO 9001:2015 certified facility delivers robust power solutions tailored for complex drive systems, multi-pulse thyristor/diode rectifiers, and heavy industrial applications.

Converter duty transformers are exposed to severe electrical stresses, steep voltage transients, and high current harmonics generated by solid-state power electronics. Our transformers are engineered with high mechanical short-circuit strength, reinforced insulation, low eddy current loss lamination, and optimized magnetic flux density to ensure uninterrupted performance in extreme operational environments.

Up to 15 MVA Custom Rating Scope

6 / 12 / 18 / 24 Pulse Multi-Winding Options

IEC 60076 & IS 2026 Type Tested Assurance

Industrial Converter Duty Transformer Manufactured by Urja Techniques India

Product Portfolio

Converter Duty Transformer Series

Designed and manufactured for high harmonic endurance, voltage step-up/step-down, and specialized industrial drives.

Industrial Converter Duty Transformer

Heavy-duty 3-phase unit engineered with electrolytic grade copper windings for power electronics, VFD systems, and industrial rectifier installations.

Capacity: Up to 5000 kVA
Primary Voltage: 11 kV / 33 kV
Cooling: ONAN / ONAF
Winding Material: 99.99% Electrolytic Copper

High-Capacity Converter Transformer

Built for demanding high-power industrial conversion applications. Features enhanced thermal margins and stray-flux shielding to withstand high THD load currents.

Capacity: 500 kVA to 15,000 kVA
Voltage Rating: 11 kV to 33 kV
Efficiency: Up to 99.9%
Cooling: ONAN / OFAF

Heavy Duty Multi-Winding Converter Transformer

Heavy Duty Multi-Winding Transformer

Designed with multi-phase secondary configurations (Star/Delta displacement) for 12-pulse and 24-pulse harmonic elimination in heavy drives and electrolysis.

Capacity: 10 kVA to 5000 kVA
Tap Changer: OLTC / Off-Circuit Tap Changer
Standards: IS 2026, IEC 60076
Structure: Disk / Layer Wound Winding

Technical Data

Standard Technical Specifications

Parameters can be customized according to client single-line diagrams (SLD) and grid compliance requirements.

Parameter	Standard Specification Scope
Power Rating Capacity	Up to 15 MVA (15,000 kVA)
Primary Voltage Class	3.3 kV, 6.6 kV, 11 kV, 22 kV, 33 kV (Custom primary voltages available)
Secondary Voltage Class	415 V, 690 V, 750 V, 950 V or tailored multi-winding outputs
Pulse Configuration	6-Pulse, 12-Pulse, 18-Pulse, 24-Pulse Rectifier Systems
Winding Conductor	High-grade Electrolytic Copper (99.99% purity) with Paper / Enamel Insulation
Magnetic Core Material	High-Permeability Cold Rolled Grain Oriented (CRGO) Silicon Steel
Cooling Medium / Method	ONAN (Oil Natural Air Natural) / ONAF (Oil Natural Air Forced) / OFAF
Vector Group Configurations	Dyn11, Dd0, Ynd11, Dy11d0, or extended phase-shift arrangements (+/- 15 deg)
Operating Frequency	50 Hz / 60 Hz
International Compliance	IEC 60076, IS 2026, IEEE C57.18.10, ISO 9001:2015, ISO 14001:2015

Global Applications

Key Industrial Application Areas

Urja Techniques converter duty transformers power heavy industry infrastructure across 40+ countries.

Variable Speed Drives (VSD)

Providing clean voltage isolation and step-down for high-power variable frequency motor drives in heavy manufacturing.

Electrolysis & Refining

Supplying high-current DC power for aluminium smelting, copper electro-refining, chlor-alkali, and chemical processing plants.

DC Arc & Metallurgical Furnaces

Heavy-duty design capable of bearing frequent short-circuit impacts and rapid load fluctuations in steel mill melting operations.

Traction & Railway Substations

Reliable power conversion for electric railway traction networks, metro rail DC substations, and heavy transit systems.

Converter Duty Transformer