Products

Product Features

The 500kV oil-immersed three-phase double-winding unexcited voltage regulating power transformer is designed for extra-high-voltage transmission systems, ensuring efficient power transfer, stable voltage control, and high operational reliability. It adopts a high-quality grain-oriented silicon steel core and advanced oil-immersed cooling technology to reduce losses, improve thermal performance, and enhance energy efficiency. The optimized winding and insulation structure provides excellent dielectric strength, low partial discharge, and strong short-circuit withstand capability.

This transformer is suitable for large-scale substations, power grid interconnection projects, and critical transmission infrastructure. It delivers stable performance under heavy load conditions with long service life and low maintenance requirements. Manufactured in compliance with international standards, it can also be customized to meet specific technical requirements, environmental conditions, and utility specifications, making it a reliable solution for modern high-capacity power transmission networks.

Technical Specifications

500kV oil-immersed three-phase double-winding unexcited voltage regulating power transformer.

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.