High Voltage 40MVA 42MVA 110KV 220KV Electronic Three Phase Oil Filled Distribution Transformer
1. Product Overview
The High Voltage 40MVA 42MVA 110KV 220KV Electronic Three Phase Oil Filled Distribution Transformer is a large-capacity, high-voltage grade power transmission and distribution equipment designed for regional power grid operation, large energy bases and heavy industrial power supply systems. This professional three-phase oil filled power transformer provides two mainstream capacity specifications of 40MVA and 42MVA, supporting 110kV and 220kV ultra-high voltage grid access, and serves as core voltage conversion and power transmission equipment for sub-transmission and high-level distribution links. Manufactured in strict accordance with IEC 60076 international power standards and national high-voltage electrical specifications, this high voltage oil immersed transformer adopts low-loss high-permeability silicon steel core and high-strength oxygen-free copper transposed winding technology, with low partial discharge, strong short-circuit resistance and ultra-stable electromagnetic performance.
Different from conventional medium and small distribution transformers, this heavy-duty electronic oil filled transformer is specially optimized for long-distance bulk power transmission and high-load continuous operation scenarios. It adopts advanced ONAN/ONAF dual cooling modes and fully sealed anti-aging oil tank structure, effectively solving heat accumulation and insulation aging problems under long-term high-voltage and large-current operation. With excellent voltage regulation accuracy and power supply stability, the 110kV/220kV high voltage power transformer is widely applied in national power grid hubs, large-scale new energy power stations, heavy industrial bases and urban central substation projects, becoming an indispensable key device for modern high-capacity power transmission systems.
2. Core Technical Parameters
This series of high voltage three-phase oil filled distribution transformers adopts upgraded low-loss electromagnetic design and standardized industrial configuration, with flexible capacity and voltage grade options to adapt to various high-voltage power transmission and distribution engineering requirements.
• Rated Capacity: 40MVA, 42MVA (large-capacity bulk power transmission, supporting long-term full-load continuous operation)
• Primary High Voltage Grade: 110kV / 220kV ultra-high voltage input, compatible with national main grid transmission standards
• Secondary Output Voltage: Customizable conventional distribution voltages such as 10.5kV, 11kV, 13.8kV, 33kV for multi-scene power matching
• Phase Number: Three-phase symmetrical design, stable three-phase current and voltage balance
• Rated Frequency: 50Hz/60Hz dual universal, suitable for global high-voltage power grid systems
• Cooling Method: ONAN natural oil cooling / ONAF forced air cooling dual optional, adapting to high-load heat dissipation demands
• Core Material: High-grade Hi-B oriented silicon steel sheet, low no-load loss and low electromagnetic noise
• Winding Material: High-purity oxygen-free copper transposed conductor, enhanced short-circuit withstand capability
• Insulation Performance: Ultra-low partial discharge design, partial discharge volume less than 40pC, excellent lightning impulse resistance
• Vector Group: YNd11 / Dyn11 optional, effectively suppressing grid harmonic interference
• Service Life: Up to 30 years of stable service life under standard grid operating conditions
• Structural Feature: Fully sealed corrugated oil tank, maintenance-free operation, anti-oil oxidation and anti-moisture infiltration
3. Core Product Uses
The 110kV 220kV 40MVA 42MVA three-phase oil filled distribution transformer focuses on high-voltage bulk power transmission, voltage step-down conversion and regional power grid balance regulation, undertaking core power transmission and distribution tasks in high-level power systems. Its primary function is to convert 110kV and 220kV ultra-high voltage electric energy transmitted by main power grids into medium-voltage power suitable for industrial distribution and regional power supply, realizing safe, efficient and low-loss power energy transmission.
As a key hub equipment of power grid substations, this high voltage oil immersed power transformer realizes electrical isolation between high-voltage transmission grids and regional distribution networks, effectively isolating grid surge, short-circuit impact and voltage fluctuation risks, and protecting downstream power distribution equipment and user power supply safety. It can balance regional power load pressure, optimize power grid energy distribution, reduce long-distance transmission loss, and improve the overall operation efficiency and stability of large-scale power systems. In addition, this large-capacity electronic transformer supports stable grid connection and power conversion for new energy power generation bases, solving the problem of grid-connected power consumption of large-scale photovoltaic and wind power projects.
4. Main Application Scenarios
With large load capacity, ultra-high voltage resistance, strong operational stability and excellent heat dissipation performance, this 40MVA/42MVA high voltage oil filled transformer is widely used in national key power engineering, new energy bases, heavy industry and urban power grid core projects, covering high-standard power transmission and distribution scenarios.
4.1 National & Regional Power Grid Substation Projects
It is the core equipment for 110kV and 220kV regional hub substations, urban central power supply stations and power grid expansion and upgrading projects. This high voltage three-phase distribution transformer undertakes the voltage conversion and power distribution work of urban main power grids, ensures stable power supply for urban commercial, residential and industrial loads, and supports peak load regulation of regional power grids.
4.2 Large-Scale New Energy Power Generation Bases
Suitable for centralized large photovoltaic power plants, onshore and offshore wind power bases and energy storage power station grid-connection projects. The 40MVA 42MVA oil immersed power transformer converts high-voltage electric energy generated by new energy units into grid-accessible power, realizes efficient grid connection, power transmission and energy scheduling of clean energy, and improves new energy utilization rate.
4.3 Heavy Industrial & Mining Enterprise Power Supply
Widely applied in metallurgical bases, chemical industrial parks, large mining groups, thermal power plants and heavy manufacturing enterprises. This large-capacity high voltage transformer can bear long-term high-load power consumption of heavy industrial equipment, provide stable high-power power guarantee for industrial production lines, generator sets and large mechanical equipment, and meet the continuous power demand of heavy industrial production.
4.4 Cross-Regional Power Transmission Projects
Applicable for cross-region power transmission, remote area power grid coverage and power grid interconnection engineering. Relying on low-loss transmission performance and ultra-high voltage adaptability, the 110kV/220kV oil filled distribution transformer reduces power loss in long-distance transmission, solves the power supply problem of remote industrial and residential areas, and improves the coverage and stability of regional power grids.
4.5 Large Infrastructure & National Key Projects
It provides supporting power supply for high-speed railway hubs, large airport facilities, national engineering projects and ultra-large commercial comprehensive parks. With high operational reliability and strong fault resistance, the equipment ensures zero-delay stable power supply for key infrastructure and guarantees the safe operation of national key engineering projects.
5. Premium Product Features
5.1 Large Capacity & Ultra-High Voltage Adaptability
This transformer series adopts 40MVA and 42MVA large-capacity design, matching 110kV and 220kV high-voltage grid standards, which can meet the bulk power transmission demand of regional hub power grids. The optimized high-voltage insulation structure and precise electric field calculation effectively resist ultra-high voltage impact, ensuring stable operation in high-voltage and strong electromagnetic environment, and filling the demand gap of large-load high-level power distribution equipment.
5.2 Ultra-Low Loss & High Energy Efficiency
Using high-performance oriented silicon steel sheet and multi-level lap helical core structure, the equipment greatly reduces no-load loss and magnetic leakage loss. The high-conductivity transposed copper windings effectively lower load loss and operating temperature rise. Compared with traditional high-voltage transformers, the overall energy-saving efficiency is significantly improved, which greatly reduces long-term grid operation energy consumption and operation cost, and meets national and international energy-saving and low-carbon power grid construction standards.
5.3 Strong Short-Circuit Resistance & High Operational Safety
The internal winding is reinforced with multi-layer cardboard tube fixing and overall structural clamping technology, which greatly improves mechanical strength and short-circuit impact resistance. The ultra-low partial discharge design avoids long-term insulation aging and breakdown risks. Equipped with complete overvoltage, overcurrent, short-circuit and temperature protection systems, the three-phase oil filled transformer can quickly respond to grid faults, effectively protect equipment and grid safety, and adapt to complex high-voltage grid operation conditions.
5.4 Dual Cooling System & Stable Heat Dissipation
Supporting ONAN natural cooling and ONAF forced air cooling dual modes, the transformer adopts baffle-type oil flow guiding structure and special-shaped radiators to evenly distribute heat and effectively control winding and oil temperature rise. It can maintain stable heat dissipation effect under long-term full-load and overload operation, avoid equipment failure caused by overheating, and ensure 24/7 uninterrupted safe operation of high-load power systems.
5.5 Fully Sealed Maintenance-Free & Long Service Life
The fully welded sealed oil tank structure completely isolates external air, moisture and dust, preventing insulating oil oxidation and insulation performance degradation. The vacuum drying and vacuum oil injection process eliminates internal air bubbles and improves overall insulation stability. The whole machine has anti-corrosion, rust-proof and weather-resistant treatment, adapting to outdoor substation harsh environments, with low daily maintenance workload and ultra-long service life, effectively reducing later grid operation and maintenance costs.
5.6 Low Noise & Grid-Friendly Operation
Through optimized core lamination process and symmetrical winding layout, electromagnetic vibration and operating noise are effectively suppressed, realizing low-noise environmental operation. The YNd11 wiring mode effectively filters grid harmonics, stabilizes three-phase voltage balance, improves power supply quality, and will not cause electromagnetic interference to peripheral power equipment and communication systems, which is grid-friendly and environmentally reliable.
6. FAQ (Frequently Asked Questions)
Q1: What is the difference in application scenarios between 40MVA and 42MVA 110kV/220kV oil filled transformers?
The two capacity specifications are designed for differentiated load demands. The 40MVA high voltage oil filled transformer is suitable for conventional regional substations, ordinary new energy power stations and medium-sized industrial park power supply projects, meeting conventional bulk power transmission demands. The 42MVA model with slightly larger capacity is more suitable for urban core hub substations, large-scale wind-solar complementary power bases and heavy industrial clusters with peak power consumption pressure, providing sufficient capacity margin for long-term load growth and peak power supply, effectively avoiding equipment overload operation.
Q2: Can this 220kV high voltage three-phase oil filled transformer adapt to extreme outdoor substation environments?
Yes, this series of large-capacity oil immersed distribution transformers is fully optimized for outdoor substation working conditions. The fully sealed anti-aging metal shell and high-grade external protective coating resist high temperature, low temperature, strong wind, rain erosion and dust pollution. The internal insulation system and cooling structure are designed for extreme working conditions, with strong environmental adaptability and anti-aging ability. It supports long-term uninterrupted outdoor operation without frequent maintenance, fully meeting the harsh operation requirements of outdoor high-voltage substations all year round.
Q3: What are the core advantages of oil filled high voltage transformers compared with dry-type transformers in 110kV/220kV high-capacity power grid projects?
In 110kV and 220kV high-voltage large-capacity power transmission scenarios, three-phase oil filled transformers have irreplaceable comprehensive advantages. Firstly, the oil circulation cooling system has better heat dissipation efficiency and stronger overload tolerance, which is more suitable for long-term high-load operation of hub substations. Secondly, oil immersed insulation technology has higher high-voltage resistance and lower partial discharge performance, ensuring safer and more stable operation under ultra-high voltage conditions. In addition, large-capacity oil filled power transformers have lower manufacturing cost and longer service life than dry-type transformers of the same grade, with higher cost performance in grid-level large-scale power transmission projects, making them the mainstream choice for national high-voltage power grid construction.
