1000kVA Three Phase Pad Mounted Distribution Transformer 24940Y/14400V to 480Y/277V UL Listed

1. Winley Electric three-phase transformers are UL/cUL Listed under File No. E536138, with ratings from 45 kVA through 7000 kVA. They are designed and manufactured to meet applicable ANSI/IEEE, CSA, NEMA, and DOE 2016 requirements.
2. With extensive experience in North American utility, industrial, and commercial projects, Winley Electric can deliver cost-effective customized solutions based on your specific project requirements.
3. With a strong supply chain and experienced production team, standard three-phase pad-mounted transformers can be completed in 4–6 weeks after technical approval to help keep your project on schedule.

Engineered to meet the demanding requirements of modern power networks, this 1000 kVA three-phase pad-mounted transformer delivers efficient and reliable voltage conversion from 24940Y/14400V to 480Y/277V. Designed and tested in accordance with ANSI C57.12.34, the rugged, tamper-resistant unit integrates medium-voltage switching, coordinated overcurrent protection, and low-voltage terminations within a compact pad-mounted enclosure—making it a strong choice for outdoor utility distribution, commercial complexes, logistics hubs, and light industrial facilities.

Using biodegradable FR3 non-PCB insulating fluid together with KNAN natural cooling, the transformer supports dependable continuous operation at a 65°C temperature rise without auxiliary forced-air cooling equipment. Its engineered configuration includes a five-position off-circuit tap changer with ±5% adjustment, 125 kV HV BIL, coordinated bayonet and current-limiting fuse protection, and a two-position load-break switch. Together, these features provide flexible voltage matching, enhanced fault protection, convenient high-voltage circuit control, and lasting value for outdoor distribution systems.

     

• Vacuum Pressure Gauge & Pressure Relief Valve
  Provides clear local indication of internal tank pressure, while the pressure relief valve releases excessive pressure to help protect tank integrity.
• Liquid Level & Temperature Gauges
  Provide direct dial-type indication of FR3 fluid level and operating temperature for routine inspection and condition monitoring.
• Bayonet Fuse Protection
  Three-phase Bayonet fuses provide primary overcurrent protection and work with current-limiting backup fuses for coordinated fault protection.
• Two-Position Loadbreak Switch
  Allows the transformer primary circuit to be connected or disconnected under rated load conditions, supporting convenient system operation and isolation.
• Five-Position Off-Circuit Tap Changer
  Provides ±2 × 2.5% primary-voltage adjustment for matching local feeder conditions and maintaining the required secondary output.
• Drain Valve with Sampling Device
  Located near the bottom of the tank for controlled fluid draining and convenient FR3 fluid sampling without draining the entire tank.
• Comprehensive Grounding Provisions
  Includes four grounding lugs and a dedicated X0 grounding pad to provide secure grounding points for the enclosure, tank, and low-voltage neutral.

• Commercial Power Supply

  Suitable Applications:
  Shopping centers, office buildings, mixed-use developments, hotels, and school campuses.

  Why This Transformer Fits:
  The 480Y/277V secondary provides a widely used North American distribution voltage for HVAC equipment, pumps, motors, lighting, and building distribution panels. Its compact pad-mounted construction allows the transformer to be installed outdoors, helping preserve valuable indoor electrical space. FR3 natural ester insulating fluid also supports commercial projects that prioritize improved fire performance and lower environmental impact.

• Light Industrial Facilities

  Suitable Applications:
  Manufacturing plants, assembly workshops, processing facilities, logistics centers, and warehouse distribution hubs.

  Why This Transformer Fits:
  The 1000 kVA rating provides substantial capacity for motors, production equipment, conveyors, material-handling systems, HVAC equipment, and facility auxiliary loads. Its liquid-filled KNAN design supports dependable outdoor operation without auxiliary forced-air cooling, while the enclosed pad-mounted construction helps protect the high-voltage and low-voltage connection areas from direct access and outdoor exposure.

• Utility Distribution Points and Outdoor Networks

  Suitable Applications:
  Municipal underground distribution systems, suburban utility service points, commercial parks, and institutional distribution networks.

  Why This Transformer Fits:
  Designed and tested in accordance with ANSI C57.12.34, the transformer is configured for North American three-phase pad-mounted distribution. Its 24940Y/14400V primary rating connects to 25 kV-class distribution systems, while the dead-front medium-voltage interfaces, two-position load-break switch, and coordinated bayonet and current-limiting fuse protection support secure outdoor switching, cable connection, and primary fault protection.

A: Winley delivers standard three-phase pad-mounted transformers with a 4–6 weeks production time after technical approval. We provide a detailed production schedule and real-time manufacturing photos to help track progress.

A: We offer a flexible MOQ of just 1 unit. Complete inquiries are quoted within 1–2 days with 24/7 support. Leveraging our extensive North American project experience, we ensure highly cost-effective and reliable solutions.

A: Yes, We accept OEM and ODM. Winley three-phase pad-mounted transformers are available in standard ratings from 45–5000kVA (and maximum capability up to 7000 kVA), with HV systems up to 36 kV. We can customize electrical parameters, structure, fluid, protection, switches, gauges, tank and paint according to customer drawings, with the capability to integrate components from brands like Qualitrol, Eaton Cooper, and MR.

A: Yes. Our full range of products are UL/cUL-certified under UL File No. E536138, designed strictly in compliance with ANSI/IEEE, CSA, DOE, and NEMA requirements to meet grid connection and regulatory standards.

A: We deliver a complete compliance package: approval drawings, datasheets, routine test reports, UL/cUL certs, DOE 2016 docs, and operation manuals. We also back your project with lifetime documentation support.

A: Winley ensures quality through 4 annual unannounced UL audits and strict ISO 9001 process management with dedicated QC oversight. Prior to delivery, every unit undergoes comprehensive routine testing, including Winding Resistance, Turns Ratio, Polarity and Phase Relation, and No-Load Loss and Excitation Current tests. We also fully support Factory Acceptance Testing (FAT) and third-party inspections (SGS).

A: 24 months from B/L. During the warranty period, If there are any accessory problems, just provide 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 can also provide technical support if you need.