Heavy-Duty Substation & Industrial Power Transformers
URJA Techniques designs and manufactures oil-immersed power transformers up to 10 MVA in the 33 kV voltage class. Engineered to perform reliably under demanding electrical network conditions, our units serve power utility substations, renewable energy parks, oil refineries, chemical plants, and heavy manufacturing facilities globally.
Each unit is tailored to customer technical specifications, offering either On-Load Tap Changers (OLTC) with automatic voltage regulating relays (RTCC) or Off-Circuit Tap Changers (OCTC). Designed and evaluated strictly in accordance with IEC 60076, IS 2026, and ANSI/IEEE standards, our power transformers feature high short-circuit withstand capabilities verified by premier test bodies including CPRI and ERDA.
Engineered for High Reliability & Long Life
Short-Circuit Proven
Type-tested at independent test laboratories (CPRI & ERDA) for dynamic and thermal short-circuit withstand strength, ensuring structural integrity during network faults.
Low Core & Copper Loss
Constructed with laser-scribed, high-permeability prime CRGO silicon steel laminations with step-lap mitered joints and electrolytic grade copper conductor windings.
Advanced Cooling
Available in ONAN, ONAF, and OFAF configurations with engineered radiator headers and multi-stage cooling control, designed for elevated ambient and tropical environments.
Standard Specifications & Parameters
| Power Rating Capacity | Up to 10,000 kVA (10 MVA) Three Phase / Single Phase |
|---|---|
| Voltage Class | Primary up to 33 kV (e.g., 33 kV, 22 kV, 11 kV, 6.6 kV) / Secondary as required |
| Applicable Standards | IEC 60076, IS 2026, BS 171, ANSI C57.12, IEEE Standards |
| Insulating Fluid | Mineral Transformer Oil (IS 335 / IEC 60296) or Ester Fluid (FR3 / Synthetic) |
| Cooling Methods | ONAN (Oil Natural Air Natural) / ONAF (Oil Natural Air Forced) |
| Voltage Regulation / Tapping | On-Load Tap Changer (OLTC) with RTCC panel / Off-Circuit Tap Changer (OCTC) |
| Vector Group | Dyn11, Dyn5, Ynd11, YNd1, or as per site network configuration |
| Frequency | 50 Hz / 60 Hz |
| Standard Protection Fittings | Buchholz relay, Magnetic Oil Level Gauge (MOG), OTI/WTI with alarm & trip, Pressure Relief Device (PRD), dehydrating breather |
| Export Markets Supplied | UAE, Saudi Arabia, Oman, Kenya, Nigeria, South Africa, Tanzania, Indonesia, and Australia |
Looking for Custom Power Transformer Engineering?
Consult with our transformer design engineers for specialized vector configurations, dual-voltage designs, loss evaluation, and complete technical tenders.