Customization 220kV 225kV 230kV 245kV Class oil-immersed three-phase Power transformer
Key attributes
| Brand | ROCKWILL |
| Model NO. | Customization 220kV 225kV 230kV 245kV Class oil-immersed three-phase Power transformer |
| Rated capacity | 240000kVA |
| Primary voltage | 230kV |
| Secondary voltage | 6.3kV |
| Methods of regulation | On Load Voltage Regulating |
| Winding type | Double Winding |
| Series | SF/SFS Series |
Product descriptions from the supplier
Overview
As a pioneer in China's power transformer industry, we have specialized in the R&D and manufacturing of power transformer equipment for decades, and established industry standards with core technologies.
Premium Durability: Superior insulation and mechanical resilience allow for extended system life and overall system reliability.reducing the frequency of outages.
Certified Quality: Oil-immersed power transformers are manufactured, tested and delivered in our accordance with all applicable standards (ANSI, IEEE) maintaining US compliance which simplifies service and retrofitting.
Energy Efficient: Designed to accommodate heavier base loading for extended periods of time with low energy loss and minimal partial discharge for optimized energy savings.
This power transformer is fully compliant with international standards including IEC 60076-1, IEEE C57.12.00, ANSI C57.12.90, AS/NZS 60076.5 and EN 61558-1. It meets quality requirements and is widely adaptable to the operational needs of power grids in multiple overseas regions.
The voltage classes of some of these Power Transformer include 6kV, 6.3kV, 6.6kV, 6.9kV, 7.2kV, 10kV, 10.5kV, 11kV, 11.5kV, 12kV, 13.2kV, 13.8kV, 14.5kV, 14.4kV, 15kV, 15.5kV, 15.6kV, 17.5kV, 20kV, 21.9kV, 22kV, 24kV, 30kV, 33kV, 33.5kV, 34.5kV, 35kV, 36kV, 38kV, 38.5kV, 40.5kV, 44kV, 45kV, 46kV, 66kV 69kV.72.5kV 88kV 110kV 115kV 123kV 125kV 126kV 132kV 138kV 145kV 150kV 154kV 161kV 170kV 220kV 225kV 230kV 245kV 275kV 330kV 345kV 363kV 380kV 400kV 500kV Power transformers of voltage ，and aboveand customization is available.
Feature
Multi-voltage Level Customization for Diverse Power Grid Scenarios：Supports full-range voltage level customization of 220kV/225kV/230kV/245kV, which can accurately meet the access requirements of different power systems such as thermal power plants, substations, large-scale industrial bases, and wind-solar new energy grid connection.
High-efficiency and Energy-saving Design to Reduce the Whole Life Cycle Cost：Adopts high-grade silicon steel sheet core and optimized winding structure, reducing no-load loss by 15-20% and load loss by 8-10% compared with traditional models; complies with IEC/ANSI international energy efficiency standards, significantly cutting down annual power consumption and long-term operation and maintenance costs.
Superior Stability and Reliability to Extend Equipment Service Life：Equipped with hybrid insulating oil technology, which extends the service life of insulating paper to 1.91 times that of the mineral oil-only solution; the fully sealed corrugated oil tank isolates air contact to prevent oil oxidation and deterioration, enabling stable operation for more than 30 years; passes the IEC 60076-5 short-circuit withstand test, capable of withstanding 32 times the rated current impact, with outstanding fault resistance performance.
Optimized Thermal Management System to Ensure High-load Operation Stability：Adopts optimized oil flow distribution structure and axial oil duct design, effectively reducing the winding hot-spot temperature and ensuring the continuous and stable operation of equipment under high-load conditions; the vacuum oil filling + closed-loop hot oil circulation process thoroughly removes moisture in the oil, improving insulation performance and heat dissipation efficiency.
Operating condition
1.working temperature：-30℃~40℃
2.Relative humidity: ＜90% (25℃)
3.No corrosive gas, no obvious dirt, etc.
4.Altitude: ＜1000m
Applications:
The 220kV power transformers that are used in high-voltage transmission substations, large industrial facilities, and renewable energy projects to efficiently step up or step down power for long-distance distribution. They also support urban substations and critical infrastructure, ensuring stable electricity supply for national grid.
If you need to know about more parameters , Please check the model selection manual.↓↓↓
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Related Knowledges
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Main Transformer Accidents and Light Gas Operation Issues1. Accident Record (March 19, 2019)At 16:13 on March 19, 2019, the monitoring background reported a light gas action of No. 3 main transformer. In accordance with the Code for Operation of Power Transformers (DL/T572-2010), operation and maintenance (O&M) personnel inspected the on-site condition of No. 3 main transformer.On-site confirmation: The WBH non-electrical protection panel of No. 3 main transformer reported a Phase B light gas action of the transformer body, and the reset was ineff02/05/2026 -
Faults and Handling of Single-phase Grounding in 10kV Distribution LinesCharacteristics and Detection Devices for Single-Phase Ground Faults1. Characteristics of Single-Phase Ground FaultsCentral Alarm Signals:The warning bell rings, and the indicator lamp labeled “Ground Fault on [X] kV Bus Section [Y]” illuminates. In systems with a Petersen coil (arc suppression coil) grounding the neutral point, the “Petersen Coil Operated” indicator also lights up.Insulation Monitoring Voltmeter Indications:The voltage of the faulted phase decreases (in01/30/2026 -
Neutral point grounding operation mode for 110kV～220kV power grid transformersThe arrangement of neutral point grounding operation modes for 110kV～220kV power grid transformers shall meet the insulation withstand requirements of transformer neutral points, and shall also strive to keep the zero-sequence impedance of substations basically unchanged, while ensuring that the zero-sequence comprehensive impedance at any short-circuit point in the system does not exceed three times the positive-sequence comprehensive impedance.For 220kV and 110kV transformers in new constructi01/29/2026 -
Why Do Substations Use Stones, Gravel, Pebbles, and Crushed Rock?Why Do Substations Use Stones, Gravel, Pebbles, and Crushed Rock?In substations, equipment such as power and distribution transformers, transmission lines, voltage transformers, current transformers, and disconnect switches all require grounding. Beyond grounding, we will now explore in depth why gravel and crushed stone are commonly used in substations. Though they appear ordinary, these stones play a critical safety and functional role.In substation grounding design—especially when multiple gr01/29/2026 -
Why Must a Transformer Core Be Grounded at Only One Point? Isn't Multi-Point Grounding More Reliable?Why Does the Transformer Core Need to Be Grounded?During operation, the transformer core, along with the metal structures, parts, and components that fix the core and windings, are all situated in a strong electric field. Under the influence of this electric field, they acquire a relatively high potential with respect to ground. If the core is not grounded, a potential difference will exist between the core and the grounded clamping structures and tank, which may lead to intermittent discharge.I01/29/2026 -
Understanding Transformer Neutral GroundingI. What is a Neutral Point?In transformers and generators, the neutral point is a specific point in the winding where the absolute voltage between this point and each external terminal is equal. In the diagram below, pointOrepresents the neutral point.II. Why Does the Neutral Point Need Grounding?The electrical connection method between the neutral point and earth in a three-phase AC power system is called theneutral grounding method. This grounding method directly affects:The safety, reliabilit01/29/2026
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