UL/cUL Listed 2.5 MVA Three Phase Pad Mounted Transformer 2500KVA Oil-Immersed 12470V To 400V ANSI/IEEE Standards

The 2.5 MVA (2500 kVA) pad-mounted, compartmental-type transformer is a liquid-filled, three-phase step-down unit engineered for reliable distribution service. Designed for loop-feed applications, it features a DYN1 vector group with a 12,470 V delta primary (15 kV class, 95 kV BIL) and a 400Y/231 V wye-neutral secondary (1.2 kV class, 30 kV BIL). The transformer is rated for 60 Hz operation, 65°C temperature rise, Class E insulation (120°C), and KNAN (self-cooled) cooling with no forced air fans.

WINLEY offers a complete line of liquid-filled three-phase pad-mounted transformers that meet ANSI®/IEEE® standards and have obtained UL/cUL certification. With voltages up to 34.5 kV and ratings up to 5,000 kVA, these transformers suit high-voltage and large-capacity applications like substations and industrial power systems. Their oil-immersed design ensures superior performance and stability in high-load, high-voltage scenarios.

Main data

Technical drawings

Key electrical and mechanical highlights:

• Capacity: 2.5 MVA, efficiency 99.40%
• Impedance: typical 5.0–7.5%
• Tap changer: 5-position (±2.5%)
• 600 A / 15 kV switch located in HV front compartment
• Primary: dead-front V terminal arrangement, 6 connections for elbow connectors, three HV elbow surge arrestors included
• Secondary: live-front staggered NEMA spade terminals supporting multiple lug connections;neutral grounded to tank
• Overcurrent protection: bayonet expulsion fuse with partial-range current-limiting fuse (oil-immersed)
• Insulating fluid: biodegradable natural vegetable oil ester (non-PCB)
• Winding: aluminum;
• core: grain-oriented steel;
• tank/cabinet/base: coated steel
• Enclosure: compartmental air-filled cabinet, NEMA 3R weatherproof, seismic rated, pad-mounted with bottom-feed underground conduit entry
• Safety, controls and serviceability:
• Load break switch (1 × 600 A, 15 kV) and HV bayonet fuse holder with drip shield
• Analog gauges for liquid level, temperature, and pressure; automatic pressure-relief device; gas sampler valve and accessible fill/drain ports
• Tamper-proof housing, hinged pad-lockable doors, hot stick stored on HV door
• Lifting lugs and provisions for jacking, rollers, or skidding for installation
• Standards and compliance:
• Meets DOE 2016 efficiency requirements and multiple ANSI/IEEE, CSA, ASTM, NEMA, and federal standards (including ANSI/IEEE C57 series, C62.11, C62.22, and 10 CFR Part 431)
• Typical dimensions and weights:
• Dimensions: 75" W × 75" D × 73" H
• Dry weight: 4,918 lb; total weight (filled): 11,534 lb
• Rated ambient: -40°C to +40°C; sound level ~62 dBA; altitude rating 3,300 ft (1,000 m)
• This transformer delivers high-efficiency, robust protection, and environmentally friendly insulating fluid for utility and industrial pad-mounted distribution applications. For detailed specifications, testing data, or customization options, contact our sales engineering team.

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.