370000 kva 400000kva 220kv 66kv Oil Electricity Distribution Transformer
1. Product Overview
Our manufactured high quality outdoor ovenproof 370000 kva 400000kva 220kv 66kv oil electricity distribution transformer is a large-capacity, high-voltage oil-immersed power transformation equipment independently developed and produced for national power grid, regional power transmission and large-scale industrial energy supply projects. Manufactured in full compliance with IEC 60076 international power transformer standards and high-voltage power equipment industry specifications, this three-phase high-capacity power transformer adopts advanced vacuum oil injection and fully sealed structural technology, specializing in 220kV to 66kV medium and high voltage step-down power conversion and regional power distribution work.
As a core main transformer for 220kV high-voltage substation, this outdoor ovenproof oil electricity distribution transformer covers two mainstream large capacities of 370000kVA and 400000kVA, perfectly matching the 220kV high-voltage input and 66kV medium-voltage output operation mode. Different from conventional small and medium-sized distribution transformers, this high-capacity oil immersed transformer is designed for long-term full-load and overload operation of large power grids, with excellent high temperature resistance, outdoor weather resistance and ovenproof performance, adapting to harsh outdoor substation operation environments all year round.
All core components of the equipment adopt high-purity copper winding and high-permeability silicon steel sheet core, with optimized electromagnetic structure design, effectively reducing operating loss and improving power transmission efficiency. As a professional manufacturer of high-voltage power transformation equipment, we strictly control each production process to ensure the transformer has stable operating performance, strong fault resistance and ultra-long service life, which is widely applied in provincial power grid hubs, large industrial bases, new energy power generation matching and other key power engineering projects.
2. Technical Parameters
Technical Parameter Item | 370000kVA 220kV/66kV Transformer | 400000kVA 220kV/66kV Transformer |
Rated Capacity | 370000 kVA (370MVA) | 400000 kVA (400MVA) |
High Voltage Rated | 220kV (±2×2.5% tapping range) | 220kV (±2×2.5% tapping range) |
Low Voltage Rated | 66kV | 66kV |
Phase Structure | Three Phase | Three Phase |
Cooling Mode | ODAF / ONAF / ONAN optional | ODAF / ONAF / ONAN optional |
Vector Group | YNd11 (grid standard) | YNd11 (grid standard) |
Rated Frequency | 50Hz | 50Hz |
No-load Loss | ≤195kW | ≤210kW |
Load Loss (75℃) | ≤680kW | ≤725kW |
Short-circuit Impedance | 12% - 14% | 12% - 14% |
No-load Current | ≤0.45% | ≤0.40% |
Insulation Level | 220kV high voltage grade | 220kV high voltage grade |
Operating Temperature Range | -30℃ ~ +50℃ | -30℃ ~ +50℃ |
Protection Grade | Outdoor IP65 Ovenproof | Outdoor IP65 Ovenproof |
Design Service Life | 30 Years | 30 Years |
3. Core Product Features
This high-quality outdoor ovenproof 220kV 66kV large-capacity oil electricity distribution transformer adopts upgraded industrial manufacturing technology and grid-level design standards, with prominent advantages in high temperature resistance, energy saving, safety stability and outdoor adaptability, fully meeting the rigorous operation requirements of high-voltage power grid hubs:
3.1 Professional Outdoor Ovenproof & Weather Resistance Performance
Different from ordinary indoor transformers, this large oil immersed distribution transformer is specially optimized for outdoor substation harsh environments. The whole machine adopts high-temperature resistant anti-corrosion paint and thickened sealed shell structure, with excellent ovenproof, sun-proof, rain-proof and anti-aging capabilities. It can stably operate under long-term high-temperature baking and extreme weather conditions, effectively avoiding shell aging, paint peeling and internal equipment failure caused by outdoor high-temperature exposure, and greatly improving outdoor operation reliability.
3.2 Ultra-low Loss & High Power Transmission Efficiency
The core adopts high-grade grain-oriented cold-rolled silicon steel sheets with multi-stage overlapping process, which minimizes magnetic leakage and iron loss. The internal winding uses high-purity oxygen-free copper wire with dense and uniform winding structure, which effectively reduces copper loss during high-load operation. Compared with traditional old-fashioned high-voltage transformers, the 370000kVA and 400000kVA models have lower no-load and load loss, effectively reducing long-term grid operation energy consumption and improving overall power grid transmission efficiency.
3.3 Advanced Oil Immersed Cooling & Sealed Insulation System
Filled with high-purity anti-aging high-voltage insulating oil that meets international standards, the equipment forms an efficient circulating heat dissipation system. Equipped with large-scale external radiators and automatic cooling fans, it can quickly dissipate huge heat generated by long-term full-load operation of large-capacity windings. The fully sealed vacuum oil injection process isolates internal insulating oil from air, preventing oil oxidation, moisture absorption and emulsification, maintaining stable insulation performance for a long time and avoiding high-voltage breakdown faults.
3.4 Strong Short-circuit Resistance & Operational Stability
The winding structure adopts integral fastening and damping reinforcement design, with strong mechanical strength and impact resistance. It can withstand instantaneous short-circuit impact and load fluctuation of high-voltage power grid, without winding deformation and displacement. The YNd11 vector group design ensures balanced three-phase current and stable voltage output, effectively suppressing grid voltage fluctuation and harmonic interference, and ensuring safe and stable operation of regional power distribution system.
3.5 Intelligent Monitoring & High Safety Performance
The transformer is equipped with professional supporting accessories such as high-precision temperature sensors, oil level monitoring gauges, pressure relief valves and gas relays. It can realize real-time monitoring of operating temperature, oil level and internal fault state. In case of overload, overheating or internal short-circuit faults, it can automatically alarm and release pressure to avoid equipment damage and grid safety accidents, with high automatic protection capability.
3.6 Low Maintenance & Long Service Life
The fully sealed maintenance-free structural design reduces external dust and moisture intrusion, greatly reducing daily maintenance workload. Under standard outdoor operation conditions, the equipment has a design service life of up to 30 years, with low failure rate and stable long-term operation performance, effectively reducing the later operation and maintenance cost of power grid projects.
4. Core Product Uses
As a key core equipment of 220kV high-voltage power grid system, the 370000kVA and 400000kVA outdoor ovenproof oil electricity distribution transformers undertake important power conversion, transmission and distribution tasks, supporting the stable operation of large-scale power supply systems:
High-to-medium Voltage Step-down Conversion: The core function is to convert 220kV ultra-high voltage grid electric energy into 66kV medium-voltage electric energy, realizing safe and efficient voltage grade conversion between high-voltage transmission main grid and regional distribution grid, and providing standard voltage power supply for subsequent secondary power distribution equipment.
Large-capacity Regional Power Distribution: Relying on 370MVA and 400MVA super-large power bearing capacity, the transformer undertakes centralized power distribution tasks of regional power grid hubs, uniformly distributing electric energy to urban power grids, industrial clusters and supporting power facilities, solving the power supply demand of large-area and high-power consumption areas.
Power Grid Voltage Stabilization & Load Balancing: It can effectively balance three-phase grid load, suppress voltage drift and fluctuation caused by large-scale power consumption changes, stabilize 66kV medium-voltage grid voltage, ensure the stability and quality of regional power supply, and avoid power supply jitter affecting industrial production and urban power consumption.
New Energy Power Generation Matching & Grid Connection: It supports grid connection and power conversion for large-scale wind power, photovoltaic power stations and other new energy projects, converts unstable new energy power into stable grid power, solves the problem of new energy power grid integration, and improves the utilization rate of clean energy.
Grid Fault Isolation & Safety Protection: It can effectively isolate 220kV high-voltage main grid and 66kV regional distribution grid, prevent high-voltage side fault impact from spreading to regional power consumption terminals, reduce the scope of grid faults, and improve the overall safety and anti-risk capability of power transmission and distribution system.
5. Application Scenarios
With super-large capacity, high voltage level, outdoor ovenproof performance and stable grid-level operation capability, this 220kV/66kV oil immersed power distribution transformer is widely used in various high-standard large-scale power engineering and energy supply projects:
5.1 Provincial & Regional 220kV Substation Projects
It is the core main transformer equipment for newly built and renovated 220kV high-voltage substations in power grid hubs, suitable for regional power grid central power distribution and voltage conversion, undertaking the power transmission and distribution core tasks of urban group and regional power supply.
5.2 Large Industrial Park & Heavy Industry Base
Applicable to supporting power supply of large chemical industry, metallurgy, mining, new material industrial bases and ultra-large industrial parks. The 370000kVA and 400000kVA large capacity can fully meet the long-term high-load power consumption demand of heavy industrial production and ensure continuous industrial power supply.
5.3 New Energy Power Generation Base Grid Connection
Widely used in supporting power transformation projects of large wind power bases, centralized photovoltaic power stations and energy storage power stations. It can efficiently complete new energy power step-down conversion and grid connection, helping new energy projects achieve stable grid power transmission.
5.4 Urban Agglomeration Power Grid Upgrading & Reconstruction
Suitable for power supply capacity expansion and grid upgrading projects in super-large cities and urban agglomerations, solving the problem of insufficient power supply capacity of urban old grids, improving urban power supply reliability and meeting the growing domestic and commercial power consumption demand of cities.
5.5 Key National Infrastructure Energy Support
It can provide stable power guarantee for large-scale water conservancy projects, railway transit hubs, regional energy transmission projects and other key infrastructure, ensuring the safe and stable operation of national key engineering facilities.
6. FAQ (Frequently Asked Questions)
Q1: What is the application difference between 370000kVA and 400000kVA 220kV/66kV oil immersed transformers?
Both models adopt the same 220kV/66kV voltage level and outdoor ovenproof design, with consistent safety performance and environmental adaptability. The 370000kVA transformer is suitable for conventional regional substations, medium-scale new energy bases and urban conventional power grid upgrading projects, with moderate load capacity and more energy-saving in daily operation. The 400000kVA model has larger peak load bearing capacity and stronger overload tolerance, which is more suitable for ultra-large industrial bases, super urban agglomeration power supply and large-scale new energy centralized grid connection projects with large power consumption and rapid load growth. Users can select the model according to the project's peak power load and future expansion plan.
Q2: What are the core advantages of outdoor ovenproof design for this high-voltage large-capacity transformer?
Different from ordinary transformers, this 220kV high-voltage oil electricity distribution transformer is specially optimized for outdoor substation extreme environments. The professional ovenproof structure can resist long-term high-temperature solar radiation and high-temperature environmental baking, avoiding insulation oil aging and shell deformation caused by high temperature. At the same time, it integrates rainproof, dustproof, anti-corrosion and anti-aging functions, which can adapt to outdoor high temperature, strong wind, rain and other harsh weather all year round. It does not need to build special indoor equipment room, saving project construction cost, and has higher operation stability and longer service life in outdoor substation scenarios.
Q3: What daily maintenance and operation precautions are required for 220kV/66kV large-capacity oil immersed transformer?
This fully sealed high-voltage transformer has low daily maintenance pressure. In daily operation, it is necessary to regularly check the equipment oil level, oil quality and operating temperature to ensure the normal operation of the cooling system; regularly monitor the 220kV high-voltage side and 66kV medium-voltage side voltage and load changes to avoid long-term overloaded operation; regularly inspect the sealing performance of the equipment to prevent oil leakage. For outdoor installed equipment, seasonal lightning protection and grounding device inspection shall be done every year to ensure grid operation safety. Professional comprehensive performance detection and insulating oil filtering maintenance are recommended every 3-5 years to keep the equipment in optimal operating state.
