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 | 63000kVA |
| Primary voltage | 220kV |
| Secondary voltage | 6.3kV |
| Methods of regulation | On Load Voltage Regulating |
| Winding type | Three 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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Distribution Equipment Transformer Testing, Inspection, and Maintenance1.Transformer Maintenance and Inspection Open the low-voltage (LV) circuit breaker of the transformer under maintenance, remove the control power fuse, and hang a “Do Not Close” warning sign on the switch handle. Open the high-voltage (HV) circuit breaker of the transformer under maintenance, close the grounding switch, fully discharge the transformer, lock the HV switchgear, and hang a “Do Not Close” warning sign on the switch handle. For dry-type transformer maintenance: first clean the porcel12/25/2025 -
How to Test Insulation Resistance of Distribution TransformersIn practical work, insulation resistance of distribution transformers is generally measured twice: the insulation resistance between thehigh-voltage (HV) windingand thelow-voltage (LV) winding plus the transformer tank, and the insulation resistance between theLV windingand theHV winding plus the transformer tank.If both measurements yield acceptable values, it indicates that the insulation among the HV winding, LV winding, and transformer tank is qualified. If either measurement fails, pairwise12/25/2025 -
Design Principles for Pole-Mounted Distribution TransformersDesign Principles for Pole-Mounted Distribution Transformers(1) Location and Layout PrinciplesPole-mounted transformer platforms should be located near the load center or close to critical loads, following the principle of “small capacity, multiple locations” to facilitate equipment replacement and maintenance. For residential power supply, three-phase transformers may be installed nearby based on current demand and future growth projections.(2) Capacity Selection for Three-Phase Pole-Mounted Tr12/25/2025 -
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Risk Identification and Control Measures for Distribution Transformer Replacement Work1.Electric Shock Risk Prevention and ControlAccording to typical design standards for distribution network upgrades, the distance between the transformer’s drop-out fuse and the high-voltage terminal is 1.5 meters. If a crane is used for replacement, it is often impossible to maintain the required minimum safety clearance of 2 meters between the crane boom, lifting gear, slings, wire ropes, and the 10 kV live parts, posing a severe risk of electric shock.Control Measures:Measure 1:De-energize th12/25/2025 -
What Are the Basic Requirements for Outdoor Installation of Distribution Transformers?1. General Requirements for Pole-Mounted Transformer Platforms Location Selection:Pole-mounted transformers should be installed near the load center to minimize power losses and voltage drop in low-voltage distribution lines. Typically, they are placed close to facilities with high electricity demand, while ensuring that the voltage drop at the farthest connected equipment remains within allowable limits. The installation site should allow easy access for maintenance and avoid complex pole struc12/25/2025
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