50000 KVA Three-Phase Oil Immersed MV&HV Transformer 110kV to 10.5kV
50000 KVA Three-Phase Oil Immersed MV&HV Transformer 110kV to 10.5kV
1. Product Overview
The 50000 KVA Three-Phase Oil Immersed MV&HV Transformer 110kV to 10.5kV is a heavy-duty medium and high voltage power transformation equipment, also commonly known as a 50MVA three-phase oil-filled power transformer. Designed for large-scale power grid transmission, industrial cluster power supply and new energy centralized grid-connected projects, this high-capacity step-down transformer features a rated capacity of 50000kVA, a standard 110kV high-voltage input and a stable 10.5kV low-voltage output. Fully manufactured in strict accordance with IEC 60076 international power standards and national high-voltage transformer industry specifications, it adopts mature duplex winding structure and professional oil-immersed insulation cooling system, serving as the core power conversion unit for 110kV high-level power transmission and distribution systems.
This industrial-grade MV&HV oil immersed transformer is equipped with high-performance grain-oriented silicon steel core and high-purity copper integral windings, effectively reducing magnetic flux leakage and operational energy loss. It supports multiple professional cooling modes including ONAN natural cooling, ONAF forced air cooling and OFAF forced circulation cooling, which can adapt to long-term full-load operation and peak overload working conditions. With optimized internal insulation structure and ultra-low partial discharge design, the equipment delivers outstanding operational stability and safety. Widely applicable to utility hub substations, large industrial self-use power stations and new energy power base projects, it is a mainstream high-efficiency and high-reliability power transformation solution for modern large-capacity power supply scenarios.
2. Core Product Features
2.1 Ultra-Low Loss Design & High Energy-Saving Performance
This 110kV to 10.5kV 50000KVA oil immersed transformer adopts 45° full miter core lamination and staggered assembly technology, which greatly minimizes no-load loss and load loss during long-term continuous operation. The upgraded high-conductivity copper winding structure optimizes current transmission efficiency, enabling the overall power conversion efficiency to exceed 99%. Compared with traditional old-generation high-capacity transformers, it effectively reduces long-term power transmission and operation loss, lowers energy consumption costs for power grid enterprises and large industrial users, and fully meets national and international energy-saving and low-carbon operation standards for high-voltage power equipment.
2.2 Super Strong Short-Circuit Resistance & Structural Stability
Aiming at the high-load and complex grid operation characteristics of 50MVA high-capacity equipment, the transformer adopts integral winding reinforcement positioning and high-strength Class A insulating material wrapping. The optimized internal magnetic field balance structure can effectively resist instantaneous short-circuit current impact and strong electromagnetic force deformation caused by grid faults. The fully sealed integral welded steel oil tank completely isolates external moisture, dust and corrosive gas, preventing internal insulation aging and transformer oil deterioration. The whole machine strictly controls partial discharge indicators within industry ultra-low standards, ensuring no structural deformation or insulation failure during long-term full-load and fluctuating load operation.
2.3 Multi-Mode Cooling & Excellent Load Adaptability
Different from medium and small-capacity transformers with single cooling mode, this high-capacity MV&HV transformer supports three mainstream cooling configurations: ONAN natural oil-air cooling, ONAF natural oil forced air cooling and OFAF forced circulation cooling. It can automatically adapt to different seasonal temperatures and load rates. Under conventional rated load, ONAN mode ensures low-noise and energy-saving operation; under high temperature environment or long-term peak load, ONAF and OFAF modes accelerate heat dissipation efficiently, effectively control equipment temperature rise, and support 24-hour uninterrupted continuous operation, with strong overload tolerance and working condition adaptability.
2.4 Precise Voltage Regulation & Stable Grid Operation
Equipped with standard ±3×2.5% off-circuit tap changer, and optional on-load tap changer (OLTC) for customized needs, this 110kV step-down transformer can finely adjust high-voltage side transformation ratio to compensate 110kV main grid voltage fluctuation. It ensures stable and balanced three-phase output of 10.5kV medium-voltage power, effectively suppresses grid harmonic interference and unbalanced load impact. Calibrated for standard 50Hz power frequency operation, it matches global mainstream high-voltage power grid frequency standards, and can maintain stable power output in complex power grid environments with frequent load changes.
2.5 Harsh Environment Resistance & Ultra-Long Service Life
The whole machine adopts anti-rust, anti-corrosion and aging-resistant structural design, which can operate stably in the ambient temperature range of -40℃ to +45℃, adapting to outdoor open-air substations, high-temperature and humid areas, dusty industrial zones and other harsh working environments. Adopting high-temperature resistant insulating oil and durable internal electrical components, the equipment has a design service life of more than 35 years, far exceeding the service life of ordinary power transformers. The fully sealed maintenance-free structure greatly reduces daily operation and maintenance workload and long-term equipment replacement costs.
3. Core Working Purposes
As a key core equipment for large-scale medium and high voltage power transmission and distribution systems, the 50000 KVA Three-Phase Oil Immersed MV&HV Transformer 110kV to 10.5kV undertakes large-capacity step-down power conversion and centralized power distribution tasks. Its core purpose is to convert 110kV high-voltage electric energy from regional main transmission grids into standard 10.5kV medium-voltage electric energy, providing high-capacity, stable and qualified power sources for large industrial clusters, urban hub power grids and large-scale new energy power bases.
In actual power system operation, this 50MVA high-voltage transformer also realizes high and low voltage electrical isolation, regional grid load balancing and voltage stabilization. It can effectively block high-voltage grid surge and lightning impulse interference, protect downstream 10.5kV distribution network equipment and terminal high-power loads from overvoltage damage. Meanwhile, it optimizes long-distance power transmission efficiency, reduces line power loss, supports regional power grid peak regulation and load scheduling, and ensures continuous and stable power supply for high-load and continuous operation scenarios, guaranteeing the safe and efficient operation of large-scale power supply systems.
4. Typical Application Scenarios
4.1 Urban & Regional Hub Substations
This 110kV/10.5kV 50000KVA high-capacity oil immersed transformer is the preferred core equipment for urban central hub substations, regional power supply centers and large-scale power grid upgrading and reconstruction projects. It undertakes the main step-down power conversion task of 110kV high-level transmission grids, converts high-voltage power into 10.5kV medium-voltage power for secondary distribution, covering large-area urban residential power consumption, commercial cluster power supply and municipal public facility electricity demand, and supporting the stable operation of large-scale urban regional power grids.
4.2 Large Industrial & Mining Enterprise General Substations
It is widely used as the main power transformation equipment for super-large industrial enterprises such as metallurgy, petrochemical, coal mining, building materials and heavy machinery manufacturing. These industries have the characteristics of ultra-high continuous load and extremely high power supply stability requirements. This high-capacity three-phase transformer can undertake the overall centralized step-down power supply task of factory general substations, providing stable 10.5kV power support for large-scale production lines, high-power motors and industrial supporting electrical equipment, avoiding production shutdown losses caused by power supply fluctuation.
4.3 Large-Scale New Energy Power Generation Bases
The equipment is perfectly matched for supporting power transformation of large-scale centralized photovoltaic power stations, onshore wind farm bases and large energy storage power stations. In new energy grid-connected systems, it completes high-capacity step-down conversion of new energy generation electric energy, solves the voltage matching and grid-connected power regulation problems of large-scale clean energy power generation, realizes efficient consumption and safe grid connection of new energy, and is an indispensable core device for large-scale new energy power base construction projects.
4.4 Large Industrial Parks & Economic Development Zones
For super-large industrial parks, chemical industry clusters and national economic development zones with concentrated high-power loads, this 50MVA oil immersed MV&HV transformer serves as the main power transformation unit of park centralized substations. It provides unified and stable 10.5kV medium-voltage power for dozens of settled enterprises, realizes centralized power distribution and unified grid scheduling management, improves the overall power supply capacity and safety level of the park, and meets the long-term high-load continuous power demand of industrial cluster areas.
4.5 Infrastructure & Key National Engineering Projects
It is also applicable to key infrastructure projects such as large airport power supply systems, port terminal power distribution, high-speed railway supporting power facilities and regional water conservancy projects. Relying on its high stability and high-capacity power supply capability, it ensures the safe and uninterrupted operation of key national infrastructure power systems, providing reliable power guarantee for major engineering construction and long-term operation.
5. Frequently Asked Questions (FAQ)
Q1: What cooling modes are optional for the 50000KVA 110kV to 10.5kV oil immersed MV&HV transformer?
This large-capacity high-voltage transformer supports three professional cooling modes to adapt to different operating conditions. The standard configuration is ONAN natural oil circulation and natural air cooling, which features low noise and energy saving for daily rated load operation. ONAF natural oil forced air cooling is optional for conventional peak load scenarios, which accelerates heat dissipation through external cooling fans. For long-term high-load and high-temperature operation environments, the upgraded OFAF forced oil circulation forced air cooling mode is available, achieving efficient and uniform heat dissipation of the whole machine. The multi-mode cooling design completely solves the temperature rise problem of high-capacity equipment and ensures long-term safe and stable operation.
Q2: What is the overload operation capacity of this 50MVA high voltage oil immersed transformer?
Different from medium and small-capacity transformers, this high-power MV&HV transformer has excellent overload resistance and voltage fluctuation tolerance. Under standard ambient temperature conditions, it can operate stably with 100% full load for a long time. It can withstand 115% rated overvoltage continuous operation and 130% short-term intermittent overload operation, and can adapt to seasonal power consumption peaks and sudden load surges in industrial production and grid power supply. The optimized oil circulation heat dissipation system and reinforced winding structure avoid insulation aging and equipment overheating damage during peak overload periods, with strong operational flexibility and stability.
Q3: What are the maintenance characteristics of this large-capacity 110kV oil immersed transformer?
This fully sealed high-capacity oil immersed transformer adopts a maintenance-free structural design for daily operation. The fully welded sealed oil tank effectively prevents insulating oil deterioration and moisture intrusion, eliminating the need for frequent oil replacement and internal core lifting maintenance required by traditional open-type transformers. Daily operation only requires regular inspection of oil level, operating temperature and sealing status. It only needs a comprehensive oil quality analysis and insulation performance detection every 3 to 5 years. The whole machine has low failure rate and extremely low long-term comprehensive maintenance cost, which is very suitable for unattended operation of large hub substations and industrial self-use power stations.
