225MVA 230kV Three-Winding Power Transformer for Utility Substations

225MVA 230kV Three-Winding Power Transformer for Utility Substations

Designed for grid expansion, main transformer replacement, and heavy industrial power supply, the Winley 225MVA 230kV power transformer provides reliable voltage transformation for high-voltage receiving stations and industrial substations.

Key Technical Features:

• Winding Configuration: Steps down 230kV to 69kV, featuring a 13.8kV delta tertiary winding to suit complex substation requirements.

• Cooling & Capacity: Equipped with a two-stage forced-air cooling system, enabling operation at 150MVA under natural cooling (ONAN) and up to 225MVA at the final forced-air stage.

• Core & Construction: Constructed with copper windings, grain-oriented silicon steel core, and a conservator-type oil preservation system.

• Maintenance & Access: Includes removable radiators with isolation valves to facilitate routine servicing.

• Monitoring & Protection: Integrated with standard protective and monitoring instrumentation, utilizing Messko temperature indicators, Qualitrol pressure protection devices, and SEL control equipment.

Winley designs and manufactures custom power transformers for 220kV and 230kV systems with ratings up to 450MVA. Parameters such as voltage ratios, winding arrangements, impedance, cooling classes, and control interfaces can be engineered to project specifications. Each unit undergoes strict Factory Acceptance Testing (FAT) with complete technical documentation provided to support project delivery.

1. High-Voltage Bushings & Insulation Performance

Equipped with 245kV-class primary bushings rated at 1045kV BIL and 72.5kV-class secondary bushings rated at 350kV BIL. Porcelain oil-filled condenser bushings include test taps for power factor testing and condition monitoring.

2. Five-Position Voltage Adjustment

The high-voltage winding features a five-position de-energized tap changer with a ±2×2.5% adjustment range, allowing the voltage ratio to be matched to the specified supply conditions while the transformer is de-energized.

3. Comprehensive Protection & Metering

Bushing current transformers provide protection and metering signals, while station-class surge arresters on the primary and secondary sides provide overvoltage protection. Qualitrol pressure protection devices and a Buchholz relay support transformer fault detection and protection.

4. Substation Monitoring Integration

The specified SEL-2414 transformer monitor and SEL-2725S Ethernet switch support monitoring and control system integration. Temperature, oil-level, and pressure protection devices provide alarm signals for operational supervision.

5. Maintenance-Friendly Cooling & Oil System

The conservator-type oil preservation system includes a silica gel breather and oil-level monitoring. Interchangeable steel radiators with individual isolation valves, together with oil sampling and drain provisions, facilitate routine inspection and maintenance.

6. Outdoor Construction & Installation Access

Designed for outdoor operation from −10°C to +45°C, the transformer features weatherproof, UV-resistant epoxy coating and a NEMA 4X wiring compartment. Lifting lugs, jacking provisions, and a base suitable for rollers or skidding support on-site handling and installation.

1. Utility Receiving Substations

Designed for utility substations requiring 230kV-to-69kV voltage transformation, supporting power transmission, regional distribution networks, and grid capacity expansion.

2. Large Industrial Power Supply

Suitable for high-voltage receiving substations serving steel plants, petrochemical facilities, mining operations, and other large industrial complexes with substantial power demands.

3. Substation Expansion & Transformer Replacement

Supports substation upgrades and main transformer replacement projects, with customizable voltage ratios, winding configurations, protection systems, and installation interfaces to meet project requirements.

20–40MVA Substation Transformers

• Three Phase Oil Filled Power Transformer 121KV Series 20000KVA
• High Voltage Three Phase Oil Immersed Transformer 110kV 25000kVA
• 40MVA Utility Substation Conservator Transformer 44kV to 34.5kV Oil Immersed ONAN CSA Standards

A: Winley provides clear capacity-based lead times after technical approval: 8–10 weeks for transformers below 10MVA, 10–12 weeks for 10–40MVA transformers, and 18–20 weeks for 40–100MVA transformers. For 230kV power transformers, the standard lead time is 20 weeks.We also 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 power transformers up to 450MVA, with HV systems up to 230kV. 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 Power 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.