Products

Product Features

1. Reliable On-load Voltage Regulation 
Equipped with an advanced on-load tap changer (OLTC), the transformer can adjust the output voltage without interrupting power supply. This feature helps compensate for voltage fluctuations caused by load variations and improves the stability of the power system. 
The on-load voltage regulating function is especially suitable for applications requiring continuous power supply and strict voltage quality, such as:

• Utility substations
• Industrial power systems
• Renewable energy collection systems
• Large commercial facilities

2. Efficient Oil-immersed Cooling System 
The transformer uses high-quality insulating oil as both an insulation medium and cooling medium. The oil circulation system efficiently transfers heat generated by the core and windings to the radiator, ensuring safe operation under continuous loads. 
Key advantages include:

• Excellent heat dissipation performance
• Long service life of insulation materials
• Stable operation under heavy loads
• Reduced risk of overheating

3. Advanced Three-phase Double-winding Structure 
The three-phase double-winding design provides a compact structure and high operational reliability. The optimized electromagnetic design helps reduce:

• No-load losses
• Load losses
• Short-circuit forces
• Noise levels

High-quality copper conductors and premium electrical steel cores are used to achieve excellent energy efficiency and mechanical strength.

Technical Specifications

66kV oil-immersed three-phase double-winding on-load voltage regulating power transformer.

Outline Installation Dimensions

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.