220kV Oil-immersed Three-phase Three-winding On-load Voltage Regulating Power Transformer
Product Introduction
Product Features
The 220kV oil-immersed three-phase three-winding on-load voltage regulating power transformer is designed for efficient and flexible voltage control in medium-to-high voltage power transmission systems. It integrates advanced on-load tap changer (OLTC) technology, enabling real-time voltage adjustment without interrupting power supply, ensuring stable grid operation under varying load conditions. The transformer adopts high-quality grain-oriented silicon steel cores and optimized winding structures to reduce no-load and load losses, improve efficiency, and minimize operating noise. Its oil-immersed cooling system provides excellent heat dissipation, enhancing thermal stability and extending service life. With strong short-circuit withstand capability, superior insulation performance, and low partial discharge levels, the unit ensures safe and reliable operation in demanding environments. It is widely applied in substations, industrial power systems, and regional grid interconnections. Customizable designs are available to meet different technical standards, environmental conditions, and utility requirements, making it a dependable solution for modern power infrastructure.
Technical Specifications
220kV oil-immersed three-phase three-winding on-load voltage regulating power transformer.
| Rated capacity(kVA) | Rated voltage and tapping range | Vector group | No load current (%) | Impedance voltage (%) | No load losses (kW) | On load losses (kW) | |||
|---|---|---|---|---|---|---|---|---|---|
| HV | Tapping range (%) | MV | LV | ||||||
| 31500 | 220 230 | ±4×1.25 ±6×1.25 ±8×1.25 | 69 115 121 | 6.3 6.6 10.5 21 36 37 38.5 | YNyn0d11 | 0.5 | HV~MV:12-14 MV~LV:7-9 | 19 | 138 |
| 40000 | 0.48 | 23 | 165 | ||||||
| 50000 | 0.48 | 26 | 194 | ||||||
| 63000 | 0.44 | 31 | 231 | ||||||
| 90000 | 10.5 21 36 37 38.5 | 0.35 | 40 | 300 | |||||
| 120000 | 0.35 | 51 | 369 | ||||||
| 150000 | 0.31 | 59 | 438 | ||||||
| 180000 | 0.31 | 68 | 538 | ||||||
| 240000 | 0.28 | 85 | 667 | ||||||
Applications
Customization Service
Certifications
Packing and Delivery
Product Design and Manufacturing Quality
Yawei Transformer applies strict quality control throughout the entire manufacturing process, including:
- Core cutting and assembly
- Winding production
- Vacuum oil filling
- Insulation system testing
- Temperature rise testing
- Partial discharge testing
- Factory acceptance testing (FAT)
Installation and Maintenance
1.Daily/Weekly Inspections
Visual check for oil leaks at gaskets, valves and welds. Verify oil & winding temperatures stay within normal limits. Listen for abnormal hum or buzz signalling loose core laminations or overload.
2.Monthly/Quarterly Checks
Check silica‑gel breather; regenerate/replace gel if pink (saturated). Confirm conservator oil level, top‑up with matching‑grade oil as needed. Clean bushings to avoid flashovers from dirt contamination.
3.Annual Maintenance
Run DGA test on insulating oil for early internal fault detection (arcing, overheating). Verify protective relays and alarm circuits work properly. Retighten external electrical connections; check tank paint and anti‑corrosion condition.
4.Long‑term Overhaul
Carry out major overhaul every 10‑15 years subject to service conditions and oil analysis. Works include oil draining, inspection of inner core and coil clamping parts, gasket replacement, and insulating‑oil reconditioning or full renewal.
Tell us the required capacity, primary and secondary voltages, phase, frequency, installation environment, applicable standard, and delivery destination. Our sales and engineering teams will review your requirements and respond within one business day.
Contact Us
Tel. / WhatsApp: +86-19940712559
Email: enquiry@Yaweielectric.com
Office Address: Building 24, No. 86 Hezuo Road, Pidu District, Chengdu City, Sichuan Province, China.
Products
Mobile Website