330kV Oil-immersed Three-phase Three-winding Unexcited Voltage Regulating Power Transformer
Product Introduction
Product Features
The 330kV oil-immersed three-phase three-winding unexcited voltage regulating power transformer is designed for high-voltage transmission networks requiring reliable performance, efficient energy conversion, and stable operation. It adopts a high-quality grain-oriented silicon steel core combined with advanced oil-immersed cooling technology, effectively reducing no-load losses, improving heat dissipation, and ensuring low operating noise. The three-winding structure enables flexible power distribution and enhanced system integration for complex grid applications.
With a robust insulation system and optimized electromagnetic design, the transformer delivers excellent short-circuit withstand capability, strong dielectric strength, and long-term operational stability. It is suitable for substations, regional grid interconnections, and large-scale power transmission projects where reliability is critical.
The product is engineered for long service life, low maintenance requirements, and consistent voltage regulation performance. Custom design options are available to meet different technical standards, environmental conditions, and utility specifications, making it a dependable solution for modern power systems.
Technical Specifications
330kV oil-immersed three-phase three-winding unexcited voltage regulating power transformer.
| Rated capacity(kVA) | Rated voltage and tapping range | Vector group | No load current (%) | Short-circuit impedance (%) | No load losses (kW) | On load losses (kW) | |||
|---|---|---|---|---|---|---|---|---|---|
| HV | Tapping range (%) | MV | LV | ||||||
| 90000 | 330 345 | ±2×2.5 | 121 | 10.5 13.8 15.75 | YNyn0d11 | 0.37 | HV-MV: 24-26 HV-LV:14-15 MV-LV: 8~9 | 42 | 302 |
| 120000 | 0.37 | 53 | 374 | ||||||
| 150000 | 0.34 | 63 | 442 | ||||||
| 180000 | 0.34 | 72 | 507 | ||||||
| 240000 | 0.32 | 89 | 629 | ||||||
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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.
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