Product Description
300kV Power Transformers
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Product Overview
300kV Power Transformers
Designed for Reliability, Efficiency, and Global Compliance
Market Context
The global energy transition is driving unprecedented demand for high-capacity power transformers. As grids become more interconnected and renewable generation scales up, transformer assets must deliver not only high availability but also operational flexibility, extended service intervals, and demonstrable environmental performance.
Our 300kV transformer portfolio is engineered to meet these challenges head-on—combining internationally proven design philosophies with manufacturing precision to serve utility, industrial, and power generation clients across Asia, Africa, Europe and the Americas.
| Rated Power | 100-720 |
| Voltage Class | 300 kV |
| Number of Phase | 3 |
| Vector Group | YNd11 or as per customer requirements |
| Losses | Complies with IEC standards or customer requirements |
| Impedance Voltage | Complies with IEC standards or customer requirements |
➜ Spec Sheet
➜ Manual
| Voltage Class | 90 kV – 330 kV | Rating Capacity | 6.3 MVA – 420 MVA |
| Short-Circuit Impedance | 7% – 24% | No-Load Current | < 0.15% – 0.3% |
| No-Load Losses | Compliant with IEC 60076 / IEEE C57.12.00 — typically 40% below GB6451 requirements | Cooling Type | ONAN / ONAF / OFAF / OFWF |
| Tap Changer | On-load (OLTC), vacuum type — > 500,000 operations capability | Insulation Level | Per IEC 60076-3, customizable to specific requirements |
| Configuration | 3-phase, OLTC-equipped, step-up transformer | Primary Voltage | 15 kV / 18 kV / 20 kV / 22 kV — matched to generator terminal voltage |
| Secondary Voltage | 110 kV – 330 kV — matched to transmission system | Frequency | 50 Hz / 60 Hz |
| Cooling Arrangement | ONAF or OFAF — natural oil circulation air cooling or forced oil / forced air | Application | Generator step-up (GSU) transformer for thermal power plants |
Transformer Features
Our 500kV power transformers are engineered for demanding high-voltage transmission and grid applications, combining optimized electrical design, advanced cooling, robust insulation, and simulation-based engineering to support reliable long-term operation.
- Advanced Core Design with high-permeability, low-loss grain-oriented silicon steel and five-step stepped-lap construction with fully mitered joints.
- Optimized Winding Design with conductor transposition and helical/interleaved disc configurations to minimize losses and enhance short-circuit withstand capability.
- Advanced Cooling System with zigzag oil duct arrangements for uniform cooling and reduced hot-spot temperature gradients.
- High-Performance Insulation with vacuum-dried and oil-impregnated windings designed to support reliable insulation performance and minimize partial discharge risks.
- Robust Tank & Mechanical Design with magnetic shunting and copper shielding to help reduce stray losses.
- Advanced OLTC System with vacuum-type on-load tap changing technology capable of more than 500,000 operations.
- Simulation-Based Engineering covering electromagnetic, mechanical, thermal, insulation, and short-circuit performance before manufacturing.
- Flexible Configuration with customizable voltage, capacity, cooling, frequency, and other electrical and environmental requirements.
CTSS
Benefits
Designed for demanding high-voltage applications, our 500kV power transformers combine robust engineering, proven design practices, and flexible configuration to support reliable long-term grid operation. From electrical and thermal performance to mechanical strength and compliance, every transformer is engineered with reliability and lifecycle performance in mind.
Power Utility
Thermal, nuclear, and large hydro power plants — generator step-up (GSU) duty.
Solar & Wind Energy
Centralized wind and solar collection stations requiring bulk power step-up.
Mining
Steel mills, mines, data centers, and other high-power industrial facilities.
EV Charging Station
High-power electrical facilities requiring reliable transformer solutions and flexible configuration.
Oil & Gas
Demanding industrial facilities requiring reliable power supply and robust transformer performance.
Telecom & Data Center
High-power data centers requiring reliable transformer solutions for demanding electrical loads.