40000 KVA Three-Phase Step Down Oil Liquid Type MV&HV Transformer 110kV to 10.5kV
40000 KVA Three-Phase Step Down Oil Liquid Type MV&HV Transformer 110kV to 10.5kV
1. Product Description
This 40000 KVA (40MVA) three-phase step down oil liquid type MV&HV transformer is a high-capacity medium and high voltage power conversion equipment professionally designed for 110kV to 10.5kV voltage stepping applications. As a mainstream large-capacity oil immersed power transformer widely used in modern power grids and industrial power supply systems, this three-phase oil liquid transformer strictly complies with IEC 60076 international standards and industrial manufacturing specifications, delivering reliable and continuous voltage conversion between 110kV high-voltage transmission lines and 10.5kV medium-voltage distribution networks.
Built with high-quality grain-oriented silicon steel core and high-purity oxygen-free copper windings, this 110kV 10.5kV step down transformer adopts advanced vacuum oil injection and fully sealed oil tank technology. Using premium transformer oil as the dual medium for electrical insulation and circulating heat dissipation, the equipment effectively eliminates internal moisture and air, stabilizing insulation performance and reducing operational loss. Supporting multiple cooling modes including ONAN and ONAF, this large-capacity HV oil immersed transformer adapts to variable load changes and complex outdoor operating environments. Equipped with precise off-load or on-load tap adjustment functions, it can fine-tune output voltage to offset grid fluctuation, ensuring consistent 10.5kV stable output under long-term full-load operation. Engineered for heavy-duty industrial and grid-level power tasks, it stands as a core piece of 110kV class power transformation equipment for large-scale power distribution and new energy grid connection projects.
2. Core Product Uses
The core purpose of this 40000 KVA three-phase MV&HV step down transformer is to undertake high-efficiency, large-capacity voltage reduction and power distribution tasks in regional power systems. It mainly steps down 110kV high-voltage electric energy transmitted from provincial and municipal main power grids into standard 10.5kV medium-voltage electric energy, which can be directly used for secondary grid distribution, large industrial cluster power supply and new energy power grid integration.
In actual power system operation, this low-loss oil immersed power transformer effectively balances regional power load pressure, stabilizes medium-voltage grid voltage levels, and suppresses voltage surge and current impact caused by peak power consumption and load mutation. It greatly reduces electric energy loss during long-distance power transmission and distribution, improving the overall energy utilization efficiency of urban and industrial power grids. With excellent short-circuit withstand capability and overload resistance, the equipment can cope with instantaneous grid faults and sudden load surges, protecting downstream 10kV distribution equipment and terminal electrical facilities from damage. Meanwhile, this high-capacity 110kV oil liquid type transformer supports 24-hour uninterrupted operation, ensuring continuous and stable power supply for key industries and urban core power consumption areas, and optimizing the operational stability and safety of the entire power distribution system.
3. Main Application Scenarios
3.1 Urban Hub Substation Construction
This 40000 KVA 110kV to 10.5kV three-phase step down transformer is the core supporting equipment for urban 110kV primary and secondary hub substations. It is widely applied in urban power grid expansion, urban central area power supply upgrading and municipal power grid reconstruction projects. It converts high-capacity 110kV grid power into 10.5kV distribution power, providing stable power guarantee for urban commercial districts, high-rise building clusters, residential communities and municipal public facilities, effectively improving urban power supply capacity and grid operation reliability.
3.2 Large-Scale New Energy Power Generation Grid Connection
It is perfectly suitable for supporting power transformation of large onshore wind farms, centralized photovoltaic power stations and biomass power generation projects. As a key grid-connected transformer for new energy power stations, it converts fluctuating electric energy generated by new energy units into stable 10.5kV medium-voltage power, realizing local power distribution and large-scale grid-connected power transmission. Its strong anti-interference performance and voltage stabilization capability effectively adapt to the intermittent power generation characteristics of new energy sources, improving grid-connected power quality and new energy consumption efficiency.
3.3 Heavy Industrial and Mining Enterprise Central Power Supply
The equipment serves as the main substation step-down transformer for large metallurgical plants, chemical industrial parks, coal mining enterprises, building material production bases and machinery manufacturing industrial zones. These heavy industrial scenarios feature high continuous load and stable long-term power consumption demand. The 40MVA large-capacity oil immersed transformer can fully meet the full-load operation demand of industrial clusters, adapt to frequent industrial load fluctuations, and avoid production shutdown and equipment damage caused by power supply instability.
3.4 Regional Power Grid and Economic Zone Power Support
It is commonly used in power supply construction of development zones, industrial agglomeration zones and suburban economic development zones. For emerging industrial parks and expanding regional power grids with increasing power demand, this high-capacity MV&HV step down transformer provides reliable medium-voltage power support, solving the problem of insufficient power supply capacity in regional development and supporting long-term economic and infrastructure construction.
3.5 Key Infrastructure and National Engineering Projects
It provides core power transformation guarantee for large-scale key infrastructure such as high-speed railway supporting substations, airport power distribution systems, large water conservancy projects and national key industrial engineering projects. These projects require ultra-high power supply stability and continuity, and this 110kV oil liquid type transformer with high operational reliability and low failure rate can fully meet the strict power supply standards of key national engineering projects.
4. Outstanding Product Features
4.1 Ultra-Low Loss Design and High Energy-Saving Efficiency
This 40000 KVA three-phase oil liquid type step down transformer adopts high-performance low-loss grain-oriented silicon steel sheets and high-conductivity oxygen-free copper windings. Through optimized iron core lamination process and three-phase winding balanced layout design, it effectively reduces no-load loss, load loss and operating reactive power loss. All energy efficiency indicators are far better than national and international industry standards, effectively cutting down long-term power transmission loss and operational power consumption costs for power grid enterprises and industrial users, making it a typical high-efficiency energy-saving HV power transformation equipment.
4.2 Reliable Fully Sealed Insulation and Anti-Aging Performance
The whole machine adopts an integrated fully sealed corrugated oil tank structure, matched with high-grade composite insulating materials and high-strength sealing accessories. Professional vacuum oil injection technology removes internal air and moisture, preventing transformer oil oxidation, deterioration and water absorption. The optimized oil-paper insulation system delivers excellent high-voltage insulation performance, resisting lightning impulse, overvoltage impact and partial discharge. The fully sealed structure completely isolates internal components from external dust, rain and humid air, avoiding insulation aging and oil leakage faults, and ensuring long-term stable operation in outdoor complex environments.
4.3 Super Strong Short-Circuit Resistance and Structural Stability
The internal iron core and windings adopt integral clamping reinforcement and mechanical anti-vibration structure design, passing strict professional sudden short-circuit test verification. This large-capacity MV&HV transformer can withstand strong instantaneous short-circuit current impact, effectively avoiding internal winding displacement, deformation and damage caused by grid faults. The overall mechanical structure is stable and reliable, with strong anti-fatigue and anti-vibration capabilities, adapting to long-term full-load operation and occasional load surge, greatly reducing equipment failure rate and improving operational safety.
4.4 Flexible Multi-Mode Cooling and Strong Environmental Adaptability
Supporting dual cooling modes of ONAN natural oil cooling and ONAF forced air cooling, the equipment can automatically adjust heat dissipation efficiency according to actual operating load and ambient temperature. The efficient circulating oil duct heat dissipation system ensures stable temperature rise control under full-load and short-time overload operation. It can adapt to a wide ambient temperature range of -40℃ to +45℃, and operate stably in high temperature, low temperature, dusty and humid outdoor environments. It is suitable for open-air substation installation and indoor high-voltage distribution room layout, with strong regional and scenario adaptability.
4.5 Low Noise Operation and Environmentally Friendly Performance
Through precise iron core vibration reduction optimization and overall noise reduction structural design, the operating noise of this three-phase step down transformer is effectively controlled, 8-10dB lower than the industry standard. It avoids noise pollution to the surrounding urban and industrial environment, fully meeting environmental protection assessment requirements for urban substations and industrial parks. The sealed oil tank structure eliminates oil volatilization risk, featuring environmental protection, safety and no pollution during long-term operation.
4.6 Low Maintenance Cost and Ultra-Long Service Life
Thanks to the fully sealed structural design, the equipment does not require frequent transformer oil replacement and internal cleaning maintenance like traditional open-type transformers. With high-quality raw materials and mature manufacturing technology, internal components have strong anti-aging and anti-corrosion capabilities. The whole machine has stable operating performance, few vulnerable parts and low daily maintenance workload. The design service life can reach up to 30 years, with extremely low long-term operation and maintenance costs and excellent comprehensive cost performance.
5. Frequently Asked Questions (FAQ)
5.1 What cooling modes does the 40000 KVA 110kV to 10.5kV oil liquid type transformer support?
This large-capacity three-phase MV&HV step down transformer supports two mainstream and practical cooling modes: ONAN natural oil natural cooling and ONAF forced air cooling. Under conventional medium and low load operating conditions, the ONAN mode can meet daily heat dissipation demands with low energy consumption and quiet operation. When the equipment runs at full load or overload for a long time in peak power consumption periods or high-temperature seasons, the ONAF forced air cooling mode can be activated to accelerate transformer oil circulation and surface heat dissipation, effectively control operating temperature rise, and ensure stable and safe operation under high-load working conditions. Users can flexibly switch cooling modes according to on-site load changes and environmental temperatures.
5.2 What are the main applicable working conditions and overload capacity of this 40MVA high voltage transformer?
This 110kV level oil immersed transformer is designed for heavy-duty grid and industrial working conditions, supporting long-term stable full-load operation at rated 40000 KVA capacity. It has excellent overload tolerance, capable of withstanding 1.5 times rated load continuous operation for 6 hours and 1.75 times rated load short-term operation for 3 hours, effectively coping with peak power consumption impact and temporary load surge. The equipment can operate stably in conventional atmospheric environments with altitude below 1000 meters and ambient temperature ranging from -40℃ to +45℃, fully adapting to urban substations, industrial parks and new energy power station operating environments.
5.3 What daily maintenance work is required for long-term operation of this large-capacity oil liquid transformer?
This fully sealed three-phase step down transformer has extremely low daily maintenance pressure compared with traditional open transformers. Daily routine inspection only needs to regularly check the oil tank for oil leakage, confirm the tightness of high and low voltage terminal connections, and monitor operating noise, oil temperature and voltage-current parameters for abnormal fluctuations. Frequent transformer oil replacement is not required. It is recommended to conduct professional oil quality testing and comprehensive insulation performance detection every 2 to 3 years, and regularly clean external heat dissipation parts and dust. With standardized simple maintenance, the equipment can maintain stable performance for a long time and extend its overall service life, greatly reducing later operational and maintenance costs.
