370000KVA & 400000KVA 220KV/66KV Oil Immersed Electricity Distribution Transformer
370000KVA & 400000KVA 220KV/66KV Oil Immersed Electricity Distribution Transformer
1. Product Description
The 370000KVA and 400000KVA 220KV/66KV oil immersed electricity distribution transformer is a high-capacity, high-voltage power transmission and distribution equipment tailored for large-scale power grid operation and industrial power supply scenarios. Designed with a standard dual voltage level of 220kV high voltage side and 66kV medium voltage side, this three-phase oil cooled power transformer adopts mature oil immersed insulation technology and integrated structural design, covering two mainstream rated capacities of 370MVA and 400MVA to meet the demand of bulk electric energy conversion and voltage stepping in modern power systems.
Manufactured in strict accordance with international IEC standards and national power industry specifications, this heavy-duty distribution transformer features a high permeability silicon steel sheet core and multi-layer insulated winding structure. The whole machine adopts fully sealed oil immersed design, equipped with professional heat dissipation and pressure regulation systems, which effectively solves the heat dissipation and insulation stability problems of high-capacity transformers during long-term full-load operation. As a core step-down power transformer for high-voltage power grids, it can stably convert 220kV ultra-high voltage electric energy into 66kV medium voltage electric energy, realizing safe, efficient and continuous power distribution and energy transmission.
Different from small and medium-sized distribution transformers, this 220kV 66KV large capacity oil transformer supports long-distance grid power transmission and regional centralized power supply, with excellent load adaptability and anti-interference ability. It is compatible with both grid peak regulation operation and stable continuous power supply of industrial bases, and is the key supporting equipment for upgrading urban power grids and building new energy power supply systems.
2. Core Application Purpose
The core function of the 370000KVA 400000KVA 220KV/66KV oil electricity distribution transformer is to complete voltage conversion, electric energy distribution and power grid load balancing in high-voltage power transmission systems, and solve the matching problem between long-distance high-voltage transmission and regional medium-voltage power supply.
First of all, it undertakes the core voltage stepping task of the power grid. It steps down the 220kV high-voltage electricity transmitted by the main grid to 66kV industrial and municipal usable voltage, providing stable medium-voltage power source for secondary power distribution equipment, and realizing the seamless connection between ultra-high voltage transmission network and regional distribution network. Secondly, this high-capacity oil immersed distribution transformer can bear large-scale grid load, effectively disperse main grid pressure, balance regional power supply and demand, and improve the overall operation stability of the power system.
In addition, the equipment has reliable overload operation capacity and voltage regulation function, which can adapt to peak and trough power consumption changes in different scenarios, ensure continuous and stable power supply for key loads, reduce power loss during electric energy conversion, and improve the economic operation efficiency of power grids and industrial power supply systems. It also plays an important role in isolating grid voltage fluctuations, suppressing harmonic interference, and protecting the safe operation of subsequent power equipment.
3. Typical Application Scenarios
3.1 Regional Power Grid Hub Substation
This 220kV/66KV high-capacity oil immersed transformer is widely used in provincial and municipal backbone power grid substations, serving as the core voltage conversion equipment of regional power hubs. It is responsible for receiving 220kV high-voltage power from the main transmission grid and distributing 66kV power to urban distribution substations, residential power supply areas and commercial power consumption zones, covering centralized power supply needs of large urban areas and urban agglomerations. Its 370000KVA and 400000KVA super large capacity perfectly matches the high power consumption demand of modern cities, effectively solving the problem of insufficient power supply capacity of traditional grid transformers.
3.2 Large Industrial Park & Heavy Industry Base
For heavy industrial scenarios with high power consumption such as chemical industry, metallurgy, mining and manufacturing industrial parks, this heavy-duty oil electricity distribution transformer provides dedicated high-power power supply support. Large industrial bases usually require stable 66kV medium-voltage power for factory power distribution and equipment operation, and the 400000KVA high-capacity model can fully meet the simultaneous operation demand of multiple large industrial equipment, avoiding power supply instability caused by excessive load. At the same time, the oil immersed heat dissipation structure adapts to 24-hour uninterrupted industrial production operation, which is suitable for continuous working conditions of industrial power supply systems.
3.3 New Energy Power Generation Booster Station
With the rapid development of new energy industry, this 220KV/66KV power transformer has become the key equipment for wind power plants, photovoltaic power stations and energy storage power stations. New energy power generation units mostly output medium and low voltage electric energy, which needs to be boosted and stabilized before being connected to the main grid. This equipment can complete the voltage matching between new energy power generation and 220kV main grid, realize safe grid connection of large-scale new energy electric energy, and effectively solve the problems of unstable power output and fluctuating voltage of wind and solar power generation.
3.4 Remote Power Transmission & Key Project Supporting
It is also applicable to remote regional power supply, railway traction power supply, urban infrastructure key projects and other scenarios. For remote industrial zones and development zones far away from urban power grids, the 370000KVA oil immersed distribution transformer can realize long-distance stable power transmission and reduce electric energy loss in the transmission process. For national key infrastructure projects with high power supply reliability requirements, its anti-short circuit and anti-interference performance can ensure zero failure operation of power supply system in extreme working conditions.
4. Product Core Features
4.1 Ultra-high Load Capacity & Stable Voltage Conversion
Equipped with two mainstream high capacities of 370000KVA and 400000KVA, this large power distribution transformer has super strong load carrying capacity, which can adapt to full-load and overload operation for a long time. The optimized winding structure and magnetic circuit design effectively reduce no-load loss and load loss, ensuring high-efficiency voltage conversion between 220kV and 66kV. The equipment supports on-load voltage regulation, which can automatically adjust voltage amplitude according to grid load changes, effectively avoid voltage drift and ensure the stability of output 66kV voltage, meeting the high-precision power supply requirements of power grids and industrial equipment.
4.2 Advanced Oil Immersed Heat Dissipation & Insulation Technology
Adopting standard oil natural air natural (ONAN) cooling mode and enhanced oil circulation heat dissipation structure, the transformer internal insulating oil can efficiently take away the heat generated by operation, ensuring stable temperature control under long-term high-load operation. The whole machine uses high-grade insulating oil and multi-layer composite insulating materials, with excellent high voltage insulation performance and low partial discharge characteristics. All internal structural parts are rounded and polished to avoid partial discharge caused by tip discharge, greatly improving the insulation safety and service life of the equipment.
4.3 Strong Structural Stability & Anti-fault Ability
The core adopts multi-level overlapping winding structure and internal rod support design, which significantly improves the short-circuit withstand capacity and mechanical stability of the transformer. The external box body is made of high-strength steel plate with anti-corrosion and weather-resistant coating, which can adapt to harsh outdoor working environments such as high temperature, low temperature and humid corrosion. The fully sealed oil tank structure prevents insulating oil from moisture and oxidation, avoids internal insulation aging, and effectively reduces equipment failure rate. In addition, it is equipped with perfect pressure relief, oil level monitoring and temperature monitoring devices, which can realize real-time early warning of operating faults.
4.4 Low Energy Consumption & Environmental Protection Operation
Optimized magnetic circuit and winding design greatly reduce no-load loss, load loss and operating noise of the equipment, meeting international environmental protection and energy saving standards. The low noise operation design avoids noise pollution to the surrounding environment, which is suitable for urban substations and residential adjacent power supply scenarios. The sealed oil circulation system will not leak insulating oil, with zero pollution risk, and the overall energy efficiency level is far higher than that of traditional old-fashioned transformers, which can effectively reduce the long-term operation cost of power grids and enterprises.
4.5 Easy Installation & Low Maintenance Cost
The integrated modular structure design simplifies the on-site installation and commissioning process of the 220KV/66KV oil immersed transformer, shortens the project construction cycle, and is convenient for on-site hoisting and fixing. The equipment has a simple internal structure and stable operating performance, with low daily maintenance frequency. It only needs regular oil quality detection and equipment appearance inspection, which greatly reduces the later operation and maintenance manpower and material costs, and is suitable for long-term unattended operation of outdoor substations.
5. Frequently Asked Questions (FAQ)
Q1: What is the difference between 370000KVA and 400000KVA 220KV/66KV oil immersed transformers in actual use?
The two models are consistent in voltage level (220kV/66kV), structural design, heat dissipation mode and safety performance, and the core difference lies in the maximum load capacity and applicable scenarios. The 370000KVA model is suitable for regional power grids with medium and stable power load, conventional urban substations and general industrial parks, with moderate operation energy consumption and higher cost performance. The 400000KVA high-capacity model is suitable for scenarios with large power load, frequent peak power consumption and high power supply demand, such as large heavy industrial bases, large-scale new energy power stations and central urban hub substations. Users can select the model according to the actual maximum power consumption and future load expansion demand of the project.
Q2: What are the key maintenance items for 220KV/66KV high-capacity oil electricity distribution transformer in daily operation?
Daily maintenance of this oil immersed power transformer focuses on insulation performance, heat dissipation system and operating parameter monitoring. First, regularly detect the quality, water content and breakdown voltage of internal insulating oil to ensure the insulation and heat dissipation performance of the oil body. Second, check the heat dissipation radiator, oil pipeline and sealing parts to avoid oil leakage and blockage of heat dissipation channels. Third, monitor the operating temperature, oil level, operating noise and voltage and current parameters in real time to eliminate hidden dangers such as overheating and overload. In addition, regular partial discharge detection and winding insulation resistance testing are required to ensure the long-term stable operation of high-voltage equipment. It is recommended to carry out a comprehensive professional maintenance every six months for full-load operating equipment.
Q3: Can this 220KV/66KV oil transformer adapt to extreme weather and harsh working conditions?
Yes, this series of high-capacity oil immersed distribution transformers have excellent environmental adaptability. The whole machine adopts weather-resistant and anti-corrosion coating, and the internal insulating parts and structural parts are treated with special technology, which can stably operate in the temperature range of -40℃ to +45℃, adapting to extreme weather such as high temperature in summer, low temperature in winter and heavy rain. The fully sealed structure can effectively prevent rainwater, dust and humid air from entering the equipment, avoiding insulation damp and internal component corrosion. At the same time, the equipment has strong seismic and anti-impact capacity, which can adapt to outdoor open-air substation environments and harsh industrial site working conditions, with high operational reliability and environmental adaptability.
