UL Certification 3750KVA Three Phase Pad mounted transformer Liquid-filled Dead Front Loop Feed 34500V to 480Y277 ANSI C57

Why choose us

As a leading pad-mounted transformer manufacturer, WINLEY delivers high-performance units with voltages up to 34.5kV and ratings up to 5.5MVA. Our UL/cUL-certified transformers meet rigorous quality benchmarks, ensuring reliability and compliance with global standards. With deep expertise in North American projects, we specialize in ANSI/IEEE, CSA, DOE, and NEMA requirements, along with local regulations, providing tailored solutions for diverse power distribution needs.

Transformer Detail

WINLEY’s 3.75 MVA (3750 KVA) three-phase pad-mounted transformer (Compartmental-Type) delivers robust step-down power distribution with a Dyn1 vector group and loop feed operation. Rated for 34500V primary (35 kV class, 150 kV BIL) and 480Y/277V secondary (1.2 kV class, 30 kV BIL), it features a 5-position tap changer (2.5% steps), 600A/35 kV load break switches, and copper windings with Class E insulation (120°C). Using biodegradable vegetable oil (422 gallons), it offers KNAN self-cooling, 5.0-7.5% impedance, and meets DOE 2016/ANSI/IEEE standards.

Main data

Technical drawings

Standard Features

Three Phase Pad mounted transformer Performance

• Safe and Reliable: They use efficient insulation protection and heat dissipation equipment, with a well-designed cable cabinet structure ensuring safety and reliability. They have a strong overload capacity, allowing for 2 times overload for 2 hours and 1.6 times overload for 7 hours without affecting their lifespan.
• Convenient Connections: The use of elbow plugs makes it easy to connect high-voltage incoming cables, allowing for plug-in and plug-out operations under power.
• Strong Defense Capability: They can effectively resist instantaneous voltage peaks, protecting power equipment from damage. They also feature double fuse protection:
• Insertion Fuse (BAY-o-NET): A dual-sensitive fuse (temperature and current) protecting against short-circuit faults on the secondary side.
• Backup Current Limiting Protection Fuse (ELSP): Protects against faults inside the transformer and the high-voltage side.
• Flexible Power Supply: They can be either terminal type or ring network type, allowing one transformer to supply power to another, enhancing power supply distance and reliability.
• Energy Saving and Environmental Protection: Designed with energy efficiency and environmental protection in mind.

Specification

Production process

FAQ

1. Q: Can I have a sample order?

A: Yes, we welcome sample order to test and check quality.

2. Q: What is the lead time?

A: Mass production time 15-25 days.

3. Q: How long is the warranty?

A: 24 monthes from B/L. If there are any accessory problems,just provide the photos of damaged accessory,then we will provide free service. According to the number of products,we will provide easily damaged accessories for free. we also can provide technical support if you need.

4. Q: Is OEM/ODM available?

A: Yes,it is! We are manufacturer with our own R&D team, we can customize products according to customer's drawing or requirements.

Customized services:

a. Customized color and special function.

b. Customized box.

c. Print customer's logo.

d. Your other ideas about product, we can help you design and put them into production. The above customized services must be confirmed before production.

5. Q: How to control the products quality?

A: Our company owns the core technology ,all kinds of products hold CE certificate. We have professional engineers. Workers are strictly required to make products according to the drawings. Each process has technical instructors.The QC supervisors will regularly inspect the production. We will do products performance tests during production, and comprehensive quality tests when the products is completed.