2500kVA Oil-Immersed Substation Power Transformer 11kV to 433V for Industrial

This 2500kVA three-phase oil-immersed substation power transformer converts 11kV primary voltage to 433V secondary voltage for industrial plants, mining facilities, water infrastructure, commercial campuses, and private substations operating on 50Hz systems.

To counteract incoming grid fluctuations and variable site demand, an integrated On-Load Tap Changer (OLTC) allows real-time ratio adjustments without interrupting downstream power supply, maintaining a continuous, regulated 11kV output. This stability is complemented by an adaptive ONAN/ONAF cooling design—utilizing natural oil circulation for efficient standard operation, while enabling forced-air cooling to handle peak loads and enhance thermal capacity under heavy-duty conditions.

Technical drawings

Standard Features

• Five-Position Off-Circuit Tap Changer — Voltage Matching
  Provides ±5% primary-voltage adjustment in five positions for matching the transformer ratio to the actual 11kV supply.
• 15kV Class Porcelain HV Bushings — Medium-Voltage Connection
  Three side-mounted porcelain bushings provide the interface between the 11kV supply and the transformer primary winding.
• 1.2kV Class LV Bushings with Four-Hole Spades — High-Current Output
  Four low-voltage bushings with four-hole terminal spades support connection to the 433V bus or outgoing cables.
• Flanged HV and LV Throats — Structured Equipment Interface
  Flanged side connections support coordinated installation with cable boxes, bus ducts, or adjacent switchgear.
• Removable Radiators with Butterfly Valves — Cooling and Transport Access
  Radiator banks provide ONAN heat dissipation, while butterfly valves allow individual radiator sections to be isolated for transport or maintenance.
• Oil Level Indicator — Oil Volume Monitoring
  Provides a direct visual indication of the insulating-oil level during inspection and operation.
• Signal Thermometer — Operating Temperature Indication
  Displays transformer oil temperature and provides a temperature signal for operating supervision.
• Pressure Relief Valve and Pressure/Vacuum Gauge — Tank Protection
  Monitors internal tank pressure and releases abnormal pressure to reduce mechanical stress on the tank.
• Filling Valve and Drain Valve with Sampler — Oil Service Access
  Supports insulating-oil filling, draining, maintenance, and representative oil-sample collection.
• Grounding Pads, Lifting Plates and Jacking Pads — Installation Support
  Provides dedicated points for protective grounding, crane lifting, positioning, and controlled equipment handling.

Packing & Shipping

   

1. With extensive experience in North American projects, Winley Electric designs substation transformers to meet applicable ANSI/IEEE, CSA, NEMA and related standard requirements.
2. With a stable supply chain, mature production processes, Winley Electric provides clear capacity-based lead times after technical approval: 8-10 weeks for transformers below 10 MVA, 10-12 weeks for 10-40 MVA transformers, and 18-20 weeks for 40-100 MVA transformers.
3. Winley Electric provides complete English technical documentation, 24/7 technical response, spare parts support, and a 2-year warranty to support project installation and long-term operation.

A: Winley provides clear capacity-based lead times after technical approval: 8-10 weeks for transformers below 10 MVA, 10-12 weeks for 10-40 MVA transformers, and 18-20 weeks for 40-100 MVA transformers. We also provide a detailed production schedule and real-time manufacturing photos to help track progress.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 1-3 days with 24/7 support. Leveraging our extensive North American experience in renewable energy, data centers and large industrial projects, we ensure highly cost-effective and reliable solutions.

A: Yes, We accept OEM and ODM. Winley provides services for substation power transformers up to 100MVA, with HV systems up to 145kV. 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. Winley substation transformers are engineered and manufactured in strict accordance with ANSI/IEEE, CSA, NEMA, relevant ASTM standards and IEC 60076.We bring a proven track record across the United States and Canada, supporting critical applications in industrial manufacturing, renewable energy, and power distribution across a range of capacity and voltage requirements.

A: We deliver a complete compliance package: approval drawings, datasheets, nameplate drawings, routine test reports, installation manuals and accessory manuals. We also back your project with lifetime documentation support.

A: Winley ensures quality through 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: Yes. Winley Electric provides tailored, fully controllable transportation solutions for large-scale transformer projects to ensure compliant customs clearance and zero-damage delivery. We actively assist in verifying critical logistics factors, including shipping dimensions, total weight, offloading conditions, site accessibility, and lifting/rigging requirements.

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.