250mva 370mva 220kv 330kv 750kv Distribution Oil-immersed Type Transformer
1. Product Overview
The 250MVA 370MVA 220kV 330kV 750kV Distribution Oil-immersed Type Transformer is a large-capacity, high-voltage grade power distribution transformation equipment developed strictly in accordance with IEC, GB and international power industry standards. This professional oil-immersed power transformer covers two mainstream large power capacities of 250MVA and 370MVA, and adapts to ultra-high voltage power grid levels of 220kV, 330kV and 750kV, serving as the core key equipment for regional power grid power transmission, voltage conversion and centralized power distribution.
Adopting advanced full-sealed oil-immersed cooling and insulation technology, thisoil-immersed type distribution transformer is equipped with ultra-low loss amorphous alloy or high-grade silicon steel sheet core and high-precision vacuum-impregnated windings. Different from conventional medium and small-capacity transformers, this series of high-power transformers is designed for long-term full-load operation of ultra-high voltage power grids, with excellent voltage stability, strong overload resistance and extreme environmental adaptability. It is widely deployed in backbone power grids, large-scale power stations and regional power distribution hubs, undertaking high-capacity electric energy conversion and transmission tasks.
2. Core Technical Parameters
This 220kV 330kV 750kV high voltage oil immersed transformer adopts industrial ultra-high voltage standardized design, with matched high-power load performance and stable operating parameters, meeting the operation requirements of large national and regional power grids:
• Rated Capacity: 250MVA, 370MVA dual large-capacity specifications, supporting ultra-large power load transmission
• Rated Voltage Grade: 220kV, 330kV, 750kV ultra-high voltage level, covering regional backbone power grid voltage standards
• Product Type: Three-phase Distribution Oil-immersed Type Transformer
• Cooling Mode: OFAF / ODAF forced oil circulation air cooling / forced oil circulation directional air cooling, efficient heat dissipation for long-term full-load operation
• Rated Frequency: 50Hz / 60Hz universal, compatible with global high-voltage power grid operation standards
• Insulation Level: Ultra-high voltage special insulation grade, with strong lightning impulse resistance, switching impulse resistance and breakdown resistance
• Operating Efficiency: Ultra-low no-load loss and load loss, comprehensive operating efficiency over 99.5%, ultra-high energy saving performance
• Protection Grade: Customized industrial heavy-duty protection, anti-corrosion, anti-seismic and anti-high temperature performance
3. Core Product Purposes
As a high-power distribution oil-immersed type transformer, this 250MVA/370MVA high voltage transformer undertakes three core key tasks in ultra-high voltage power transmission and distribution systems. First, it realizes safe and efficient voltage conversion of 220kV, 330kV and 750kV ultra-high voltage electric energy, completing step-down or step-up conversion between backbone power grids and regional power distribution networks, and solving the voltage matching problem of long-distance power transmission and regional power supply.
Second, it realizes large-capacity electric energy distribution and grid load balancing. The 250MVA and 370MVA super-large capacity can bear the centralized power transmission demand of regional power grids, evenly distribute grid load, balance the power supply pressure of each power grid node, and effectively avoid power grid overload, voltage deviation and power supply instability caused by regional power concentration.
Third, it guarantees long-term stable operation of backbone power grids. Relying on professional oil-immersed heat dissipation and high-strength insulation structure, the equipment supports 24-hour uninterrupted full-load operation, ensures continuous and stable power transmission of ultra-high voltage power grids, and provides reliable basic power guarantee for regional industrial production, urban centralized power supply and large-scale power consumption projects.
4. Typical Application Scenarios
With ultra-high voltage grade and large-capacity power transmission performance, the 250MVA 370MVA oil immersed distribution transformer is exclusive applied to high-standard large-scale power grid construction and key power engineering projects, mainly covering the following core scenarios:
4.1 National & Regional Backbone Power Grid Projects
It is the core transformation equipment for 220kV, 330kV and 750kV ultra-high voltage backbone power grids, widely used in provincial and regional main power grid hubs. It undertakes the power conversion and distribution tasks of cross-regional long-distance power transmission, realizes interconnection and peak regulation of regional power grids, and ensures the overall stable operation of large-scale power systems.
4.2 Large-Scale Power Station Matching Projects
Applicable to thermal power stations, hydropower stations, wind power bases and photovoltaic power generation bases. It converts the electric energy generated by large-scale power stations into standard ultra-high voltage electric energy for grid-connected transmission, solves the problem of large-capacity new energy and thermal power grid integration, and improves the efficiency of power resource transmission and utilization.
4.3 Industrial Heavy Load Power Supply Projects
Suitable for super-large industrial parks, mineral energy bases, chemical industrial zones and other heavy-load power consumption areas with ultra-large power demand. The 250MVA and 370MVA large capacity can meet the centralized and continuous power demand of heavy industrial equipment, supporting stable operation of high-load industrial production for a long time.
4.4 Urban Cluster & Key Infrastructure Power Guarantee
Used in urban agglomeration power supply hubs, national key engineering projects, transportation hub power supply and large-scale municipal power grid upgrading projects. It provides high-capacity and high-stability power support for urban centralized residential power consumption, commercial supporting power consumption and key national infrastructure operation.
5. Core Product Features
5.1 Ultra-High Voltage & Large Capacity Compatibility
This220kV 330kV 750kV distribution transformer covers three mainstream ultra-high voltage grades and two large-capacity specifications of 250MVA and 370MVA, which can flexibly adapt to different ultra-high voltage power grid construction standards and large-load power transmission demands. It can meet the matching needs of main grid hubs and large power stations in different regions, with extremely wide application compatibility.
5.2 Ultra-Low Loss & High Energy-Saving Performance
Adopting international advanced low-loss core material and optimized winding layout design, the equipment effectively reduces magnetic leakage loss, no-load loss and load loss. The overall energy consumption index is far lower than the industry standard, and the long-term operation energy saving effect is prominent. It greatly reduces the operation cost of power grid enterprises and meets the global green and low-carbon power development requirements.
5.3 Oil-Immersed Structure & Super Stable Operation
The optimized oil-immersed type fully sealed structure adopts high-purity special ultra-high voltage insulating oil, which has excellent heat dissipation, insulation and arc extinction performance. Equipped with forced circulating heat dissipation system, it can quickly dissipate heat generated by long-term full-load and overload operation, avoid equipment overheating and insulation aging, and ensure long-term stable and safe operation of ultra-high voltage equipment.
5.4 Strong Anti-Interference & High Safety
The whole machine adopts high-strength insulation protection and anti-harmonic design, which can resist ultra-high voltage impact, lightning surge and grid harmonic interference. It has perfect short-circuit resistance, overload resistance and seismic performance, and can adapt to complex working conditions such as extreme temperature and voltage fluctuation of backbone power grids, effectively avoiding grid operation failures and ensuring power grid safety and stability.
5.5 Intelligent & Low Maintenance Design
Equipped with professional oil temperature monitoring, pressure protection and fault early warning system, the equipment can realize real-time monitoring of operating status and automatic fault protection. The fully sealed oil tank structure prevents insulating oil deterioration and leakage, with low failure rate and long service life. It greatly reduces daily operation and maintenance workload, and improves the intelligent operation level of large power grids.
5.6 Customized & High Adaptability
This series of oil-immersed distribution transformers supports customized voltage ratio, capacity and protection configuration according to user grid conditions. It can adapt to complex terrain, extreme climate and different power grid operation modes at home and abroad, with strong engineering practicability and project adaptability.
