3150–31500 kVA Three-Phase Double-Winding Off-Circuit Tap-Changing Power Transformer

3150–31500 kVA Three-Phase Double-Winding Off-Circuit Tap-Changing Power Transformer

When you need reliable power distribution for industrial parks, substations, or large facilities, the 3150–31500 kVA Three-Phase Double-Winding Off-Circuit Tap-Changing Power Transformer from Suqian Lijie Electric Technology delivers enterprise-grade performance. Our transformers feature high-voltage off-circuit tap-changing capability with ±2×2.5% or ±5% voltage regulation range, oil-immersed double-winding construction, and YNd11 connection group configuration. With cooling options including ONAN, ONAF, and AFWF, these units achieve 99.5%+ efficiency ratings while operating reliably in both indoor and outdoor environments. Manufactured at our 500,000-square-meter facilities with ISO 9001:2015, CE, and IEC certifications, each transformer undergoes rigorous testing at the National Transformer Quality Supervision and Inspection Center.

Why Choose Our Power Transformers?

Built for Heavy-Duty Applications

You're looking for a transformer that won't let you down amid crest loads. Our medium and huge capacity transformers serve as the spine of control conveyance systems. They handle requesting scenarios with ease.

These units back steady voltage transformation from 35kV and 110kV frameworks. Your operations remain fueled without interruption.

Superior Plan and Engineering

Our double-winding oil-immersed plan gives great warm administration. The high-voltage side highlights off-circuit tap-changing components. This permits voltage alterations amid planned upkeep periods.

You get adaptability without compromising security. The cover framework complies completely with GB 1094 and GB/T 6451 national standards.

Flexible Cooling Solutions

We get it your office has special necessities. That's why we offer numerous cooling strategies:

• ONAN – Natural oil circulation with natural air cooling
• ONAF – Natural oil circulation with forced air cooling
• AFWF – Forced oil with forced water cooling

Choose the configuration that matches your environment and load profile.

Proven Manufacturing Excellence

Lijie Electric Power Technology Group operates with over 2,000 skilled employees. Our team includes 160+ engineers with advanced degrees. Two major manufacturing bases in Xuzhou and Nantong ensure production capacity and quality control.

Our annual sales exceed 5 billion RMB. This scale allows us to deliver competitive pricing without sacrificing quality.

Technical Specifications

Key Advantages

Customization to Your Specifications

Every project has different requirements. We tailor our 3150–31500 kVA Three-Phase Double-Winding Off-Circuit Tap-Changing Power Transformer to match your exact needs. Production cycles range from 6 to 30 days depending on customization level.

You get total specialized documentation counting drawings, operation manuals, and test reports.

International Quality Certifications

Our transformers carry numerous certifications:

• ISO 9001:2015 quality management
• CE marking for European standards
• IEC international compliance
• CQC and PCCC energy efficiency certification

These credentials give you confidence in product reliability and safety.

Comprehensive After-Sales Support

We don't disappear after delivery. Our service team provides:

• Installation guidance and commissioning support
• Spare parts availability
• Technical consultation throughout the product lifecycle
• Maintenance recommendations

Your speculation is secured for the long term.

Global Benefit Network

We've effectively conveyed transformers to Australia, Modern Zealand, India, Vietnam, Malaysia, Indonesia, Kazakhstan, Egypt, and Kenya. Our universal encounter implies we get it assorted framework necessities and natural conditions.

Frequently Asked Questions

Q: What's the difference between off-circuit and on-load tap-changing?

A: Off-circuit tap-changing requires the transformer to be de-energized before adjusting voltage taps. This is done during scheduled maintenance. It's more economical for applications where voltage adjustments aren't frequently needed. On-load tap-changers allow adjustments while the transformer operates, but cost more.

Q: Which cooling method should I choose?

A: ONAN works well for smaller capacities and moderate climates. ONAF provides enhanced cooling for higher loads or warmer environments. AFWF offers maximum cooling capacity for the largest transformers or extreme conditions. We'll help you select based on your load profile and location.

Q: Can these transformers operate outdoors?

A: Yes. Our product units are designed for both indoor and outdoor installation. The oil-immersed construction provides excellent environmental protection. We can also supply weather-resistant enclosures for harsh climates.

Q: What's included with delivery?

A: You receive the complete transformer, all technical documentation, factory test reports, operation manuals, and installation guidelines. We also provide spare parts recommendations and can supply them as needed.

Q: How do I know which capacity rating I need?

A: Our engineering team will assess your load requirements, future growth plans, and system voltage levels. We'll recommend the optimal capacity with appropriate safety margins. Contact us with your project details for a consultation.

Q: What's your warranty coverage?

A: We provide comprehensive warranty coverage on all transformers. Specific terms depend on operating conditions and capacity. Our after-sales team remains available throughout your transformer's service life for technical support and parts supply.

Contact Us

Reach out to our team at lijieelectrical@gmail.com to get started with your 3150–31500 kVA Three-Phase Double-Winding Off-Circuit Tap-Changing Power Transformer custom transformer solution.