63mva 70mva 80mva Three Wires Oil Immersed Power Transformer
63mva 70mva 80mva Three Wires Oil Immersed Power Transformer
1. Product Description
63mva 70mva 80mva Three Wires Oil Immersed Power Transformer is a heavy-duty high-capacity three-wire oil immersed power transformer widely deployed in utility transmission substations, large industrial power stations and centralized new energy power generation bases. Covering three mainstream large power ratings of 63MVA, 70MVA and 80MVA, this three-wire oil filled power transformer adopts standard three-wire power transmission structure and traditional oil-immersed cooling and insulation technology, fully complying with IEC 60076 international power transformer standards and grid operation specifications. As a core bulk power conversion device for medium and high voltage power systems, it is customized for large-load continuous power transmission and grid voltage matching scenarios.
Different from conventional three-phase four-wire distribution transformers, this industrial grade three-wire oil immersed power transformer omits neutral wire output, focusing purely on high-efficiency three-wire high-power transmission and voltage conversion. Equipped with high-density low-loss silicon steel core and high-purity copper windings, the equipment effectively suppresses magnetic leakage and operational power loss during long-term full-load operation. The fully sealed thickened steel tank is filled with high-quality mineral insulating oil, delivering stable insulation protection and circulating heat dissipation for internal components. Designed for 24-hour uninterrupted heavy-load operation, the 63MVA, 70MVA and 80MVA three-wire oil immersed transformers solve the problem of insufficient power transmission capacity and unstable load bearing of medium-capacity transformers, becoming essential equipment for modern large-scale power grid upgrading and heavy industrial power supporting.
2. Core Product Features
This series of 63MVA to 80MVA three-wire oil immersed power transformers has comprehensive advantages in load capacity, operational stability, energy-saving performance and environmental adaptability. The optimized three-wire transmission structure and mature oil immersed process make it more targeted for high-power industrial and grid transmission scenarios, with higher operating efficiency and lower failure rate than ordinary distribution transformers.
2.1 Professional Three-Wire Transmission Structure for High Power Efficiency
Adopting exclusive three-wire power transmission design without neutral line configuration, this oil immersed power transformer concentrates structural performance on three-line balanced high-power transmission. It avoids power loss and resource waste caused by neutral line load dispersion, effectively improving overall power transmission efficiency. The balanced three-wire electromagnetic layout ensures uniform current distribution in full-load operation, eliminates three-phase current unbalance deviation, and perfectly adapts to high-capacity pure power transmission demands of substations and industrial self-provided power stations.
2.2 Graded Capacity Matching for Diverse Heavy-Load Scenarios
Three graded large capacities cover different heavy-load power transmission requirements. The 63MVA three-wire oil immersed transformer is suitable for conventional regional substation fixed load power transmission; the 70MVA model reserves moderate overload margin for projects with periodic load fluctuation; the 80MVA ultra-large capacity is tailored for super-large industrial parks and large-scale new energy base bulk power grid connection. Users can select matching specifications according to actual peak load and long-term power expansion plans to avoid equipment overload operation or capacity redundancy waste.
2.3 Ultra-Low Loss Energy-Saving Operation Performance
Using advanced full-mitered core stacking technology and precision copper winding process, this high-capacity oil immersed power transformer greatly reduces no-load loss, load loss and magnetic leakage loss. The optimized internal magnetic circuit structure minimizes idle power consumption during standby and low-load operation. Under long-term continuous full-load working conditions, the power conversion efficiency remains at a high level, effectively reducing long-term operating power consumption of power grids and industrial enterprises, and meeting national and international energy-saving and low-carbon operation standards for high-voltage power equipment.
2.4 Reliable Oil Immersed Cooling and Sealed Insulation System
Equipped with mature ONAN/ONAF composite cooling mode, the internal insulating oil forms natural circulating heat dissipation, which can quickly take away heat generated by high-power operation and keep internal temperature rise within a safe range. The fully welded sealed steel tank completely isolates internal windings and iron core from external air, moisture and dust, preventing insulating oil aging, moisture absorption and oxidation deterioration. The high-strength oil-paper insulation system maintains stable dielectric strength under long-term high-voltage and heavy-load operation, avoiding insulation breakdown faults.
2.5 Strong Overload Resistance and Operational Safety
Reinforced internal mechanical support structure significantly enhances the transformer’s short-circuit impact resistance and seismic stability. Built-in multi-dimensional safety protection mechanisms including over-temperature protection, overload locking, pressure relief protection and short-circuit automatic trip can quickly respond to grid sudden faults. The outer shell adopts multi-layer anti-corrosion and weather-resistant spraying treatment, adapting to outdoor substation open-air operation and harsh industrial environments, with long service life and low operational failure rate.
3. Core Usage
As professional high-capacity power transmission and conversion equipment, 63mva 70mva 80mva Three Wires Oil Immersed Power Transformer is mainly used for step-up and step-down voltage conversion and bulk power transmission in medium and high voltage power systems. Relying on three-wire high-efficiency transmission characteristics, it undertakes core tasks of regional power load balancing, long-distance power transmission loss reduction and large-capacity power grid connection.
In actual power grid operation, this heavy-duty oil immersed power transformer can effectively undertake centralized power transmission of urban main substations, stabilize regional grid operation voltage, and optimize power distribution structure. For large industrial enterprises, it provides continuous and stable high-power power support for heavy-load production equipment, ensuring the continuity and stability of industrial power consumption. In new energy power generation projects, it completes centralized collection and grid-connected transmission of large-scale wind power and photovoltaic power, solving the problem of insufficient grid-connected capacity of medium and small transformers, and improving the utilization rate of clean energy.
4. Application Scenarios
With large load capacity, three-wire high-efficiency transmission and strong environmental adaptability, this 63MVA, 70MVA and 80MVA oil immersed power transformer is widely used in power grid hub substations, heavy industrial bases, new energy power stations and large infrastructure power supply projects, covering almost all high-power bulk power transmission scenarios.
4.1 Urban and Regional Hub Substations
It is the most mainstream application scenario for this series of three-wire oil immersed power transformers. The 63MVA to 80MVA large capacity fully meets the bulk power transmission and voltage conversion demands of urban main substations, county-level power supply hubs and economic zone power grid upgrading projects. The three-wire high-efficiency transmission structure effectively reduces regional power transmission loss and improves urban power supply capacity and power quality, solving the problem of power supply tension in peak power consumption periods.
4.2 Heavy Industrial and Mining Enterprises
Suitable for self-provided substation power supporting of large steel mills, chemical industrial parks, non-ferrous metal smelting bases and large mining groups. These heavy industrial scenarios have long-term 24-hour continuous heavy-load power consumption characteristics. The 70MVA and 80MVA high-capacity three-wire oil immersed transformers can stably bear large current load operation, ensuring continuous power supply for heavy machinery, production lines and smelting equipment, and avoiding economic losses caused by power supply interruption.
4.3 Large-Scale New Energy Power Bases
Widely matched with centralized large-scale photovoltaic power bases, onshore wind farm clusters and energy storage power station projects. The three-wire power transmission structure adapts to large-capacity new energy grid-connected demands, efficiently collects scattered clean electric energy and converts it into grid-standard voltage for long-distance transmission. Its strong overload resistance can well adapt to the intermittent and fluctuating output characteristics of new energy power generation, improving grid-connected stability and energy utilization efficiency.
4.4 Cross-Regional Power Transmission Projects
Applied to regional power grid interconnection, cross-city power peak regulation and power resource scheduling projects. The high power transmission efficiency of three-wire oil immersed transformers reduces electric energy loss in cross-regional transmission links, realizes reasonable distribution of power resources in different regions, optimizes the overall operation structure of regional power grids, and improves power grid resource utilization rate and emergency power supply capacity.
4.5 Super Large Infrastructure Supporting Projects
Used for supporting power supply of super-large data center industrial parks, railway transit hubs, airport clusters and national key water conservancy projects. These key infrastructure projects have extremely high requirements for power supply capacity and stability. The 63MVA-80MVA high-capacity oil immersed power transformer provides reliable large-power guarantee for long-term stable operation of key national infrastructure.
5. FAQ
5.1 How to choose between 63MVA, 70MVA and 80MVA three-wire oil immersed power transformers?
All three specifications adopt the same three-wire transmission structure and oil immersed manufacturing process, with consistent insulation performance, cooling system and safety standards. The selection mainly depends on actual project load scale and future expansion demand. The 63MVA model is the most cost-effective for fixed and stable heavy-load scenarios such as conventional regional substations and mature industrial parks. The 70MVA transformer with moderate load margin is suitable for projects with seasonal load fluctuation and small-range power demand growth. The 80MVA high-capacity specification is the best choice for newly built large industrial bases and large new energy power stations with obvious future load growth, reserving sufficient capacity redundancy for long-term project operation.
5.2 What are the practical advantages of three-wire structure compared with traditional four-wire transformers?
For large-capacity bulk power transmission scenarios, three-wire oil immersed power transformers have more targeted performance advantages. Traditional four-wire transformers are designed for terminal civil power distribution with neutral line demand, which will cause extra power loss and structural redundancy when used for high-power main line transmission. The professional three-wire structure cancels neutral line configuration, focuses on three-phase balanced high-power transmission, effectively reduces equipment self-loss and line transmission loss, and improves overall power transmission efficiency. Meanwhile, the simplified structure reduces equipment failure points, making it more suitable for long-term full-load operation of high-capacity power transmission links.
5.3 What daily and periodic maintenance does this high-capacity oil immersed transformer need?
This fully sealed three-wire oil immersed power transformer belongs to low-maintenance heavy-duty power equipment. Daily operation only requires routine visual inspection of oil tank sealing status, oil level height, operating noise and surface temperature to eliminate oil leakage and abnormal overheating risks. It is necessary to regularly clean radiator surface dust to ensure unobstructed circulating heat dissipation. Thanks to the fully sealed structure, internal insulating oil is isolated from external environment without frequent replacement. Professional periodic detection including oil quality analysis, partial discharge test and winding insulation resistance inspection is recommended every 8–10 years. Standard maintenance can effectively extend equipment service life and ensure long-term stable operation of high-power power transmission systems.
