69kV Input 10kV/440V Three Phase Oil Immersed Power Transformers
1. Product Overview
The 69kV input 10kV/440V three phase oil immersed power transformer is a professional multi-voltage level step-down power conversion device designed for medium and high-voltage power transmission and industrial power distribution systems. This heavy-duty oil filled power transformer features a dual-output voltage design, with a high input voltage of 69kV, supporting stable voltage conversion to 10kV medium voltage and 440V low voltage simultaneously. Manufactured in strict accordance with IEC 60076 and IEEE C57.12.00 international industry standards, this three-phase power conversion equipment adopts mature oil immersed insulation and heat dissipation technology, which is widely recognized for stable performance and strong environmental adaptability in medium-voltage grid operation and industrial power supply fields.
Different from single-output distribution transformers, this custom 69kV three-phase oil immersed transformer can meet the dual power demand of medium-voltage grid transmission and low-voltage equipment operation at the same time. It adopts high-quality cold-rolled silicon steel sheet core and pure copper winding structure, effectively reducing no-load loss and operating noise. The whole machine applies fully sealed oil tank welding process and standard ONAN oil-natural air-natural cooling mode, which ensures continuous and stable operation under full-load and variable-load conditions. As a core medium-high voltage power transformation device, it solves the voltage matching problem between 69kV regional transmission grids and terminal 10kV distribution networks, as well as 440V industrial electrical equipment.
This industrial-grade oil immersed power transformer is tailored for large-scale power supply scenarios that require hierarchical voltage distribution. It covers the mainstream voltage grade requirements of modern industrial power grids, new energy power stations and regional power hub substations, and is a high-cost-performance upgrade solution for traditional single-voltage output transformers in medium and high-voltage power systems.
2. Core Product Functions & Purposes
The core purpose of the 69kV input 10kV/440V three phase oil immersed power transformer is to realize hierarchical voltage step-down, safe electric energy distribution and grid load balancing in 69kV medium-high voltage power transmission systems, solving the multi-level power supply demand of power grids and industrial terminals.
First of all, it undertakes the key voltage conversion task of the regional power grid. The equipment steps down the 69kV high-voltage electric energy transmitted by long-distance transmission lines to 10kV medium voltage for secondary grid distribution, and further converts it to standard 440V low-voltage industrial power, providing compliant and stable power for power distribution rooms, production equipment and electromechanical devices. This dual-output design effectively simplifies the power supply system structure, avoids the need for multiple sets of transformers for hierarchical voltage conversion, and reduces the overall investment and operation cost of power projects.
Secondly, this low-loss oil immersed power transformer optimizes electric energy transmission efficiency. It effectively suppresses grid voltage fluctuation and harmonic interference in the power conversion process, reduces electric energy loss during voltage stepping, and improves terminal power supply quality. In addition, the equipment has reliable overload resistance and short-circuit protection capabilities, which can stabilize grid operation load, isolate circuit faults, protect subsequent power distribution equipment and electrical machinery, and ensure the safety and continuity of industrial production and grid power supply. It also supports long-term unattended operation, which greatly improves the intelligent and stable operation level of medium-voltage power systems.
3. Typical Application Scenarios
3.1 Regional 69kV Medium-High Voltage Grid Substations
This 69kV input three phase oil immersed power transformer is the core equipment for regional 69kV power grid hub substations and urban power grid upgrading projects. Many suburban and industrial park power grids adopt 69kV long-distance transmission mode, and this dual-output transformer can directly convert high-voltage power into 10kV grid power for regional secondary distribution and 440V civil and industrial power, realizing integrated power transmission and distribution. Its rugged oil immersed structure adapts to outdoor substation open-air installation conditions, and can operate stably all year round in complex weather environments, which is very suitable for municipal power grid transformation and new substation construction projects.
3.2 Large Industrial & Heavy Industry Production Bases
It is widely applied in metallurgy, chemical industry, mining, manufacturing and other heavy industrial bases with dual voltage power demand. Large industrial production bases usually need 10kV medium voltage to support high-power transformer equipment and production lines, and 440V low voltage for auxiliary equipment, lighting and control systems. The 69kV/10kV/440V multi-voltage oil immersed transformer can meet the dual power demand of industrial production at one time, avoiding the redundant configuration of multiple power transformation equipment. Its strong load resistance and continuous operation capability perfectly adapt to 24-hour uninterrupted industrial production working conditions.
3.3 New Energy Power Generation & Grid Connection Projects
With the rapid development of new energy industry, this industrial oil immersed power transformer has become key supporting equipment for large-scale photovoltaic power stations, wind power plants and energy storage power stations. New energy power generation projects are mostly connected to 69kV regional transmission grids, and require hierarchical voltage conversion for grid connection and on-site power consumption. This equipment can complete the step-down processing of new energy electric energy, provide 10kV power for grid connection and 440V power for on-site operation and maintenance equipment, effectively solving the problems of unstable new energy power output and mismatched grid voltage.
3.4 Remote Engineering & Mining Field Power Supply
It is also applicable to remote mining areas, highway and railway construction projects, field exploration engineering and other scenarios. Remote engineering projects are far away from urban centralized power grids, and mainly rely on 69kV long-distance power transmission for power supply. This durable oil filled transformer can adapt to harsh field environments such as dust, humidity and temperature difference, provide stable dual-voltage power for field construction machinery, living facilities and engineering power distribution systems, and guarantee the smooth progress of field engineering construction.
4. Key Product Features
4.1 Dual-Voltage Output & High Conversion Efficiency
The 69kV input 10kV/440V three phase oil immersed power transformer adopts customized dual-output voltage design, which can stably output 10kV medium voltage and 440V low voltage at the same time, realizing one machine for multiple purposes and greatly improving the flexibility of power distribution. The optimized magnetic circuit and winding structure effectively reduce no-load loss and load loss, with higher electric energy conversion efficiency than traditional single-output transformers. It can maintain efficient and stable power conversion under long-term full-load and variable-load operation, effectively reducing the long-term power consumption cost of power grids and enterprises.
4.2 Superior Oil Immersed Insulation & Heat Dissipation Performance
Adopting high-purity mineral insulating oil and fully sealed oil circulation system, the equipment has excellent dielectric insulation performance and heat dissipation capacity. The oil-natural air-natural cooling mode can efficiently take away the heat generated by coil operation, avoid local overheating of the equipment, and ensure stable operation in high-temperature environments. The sealed oil tank structure prevents insulating oil from moisture, oxidation and leakage, maintains long-term stable insulation performance, and effectively delays the aging speed of internal components, extending the overall service life of the transformer.
4.3 Rugged Structure & Strong Environmental Adaptability
The whole machine adopts high-strength steel plate shell and integral fastening winding structure, with excellent mechanical stability, seismic resistance and short-circuit impact resistance. The surface is coated with weather-resistant and anti-corrosion paint, which can resist ultraviolet radiation, rain erosion and low-temperature freezing, and is suitable for outdoor open-air substations, industrial sites and remote field environments. Compared with dry-type transformers, this oil immersed power transformer has stronger environmental tolerance, lower failure rate in harsh working conditions, and more stable long-term operation performance.
4.4 Low Operation Noise & High Safety Factor
Through optimized core lamination and winding damping design, the equipment effectively reduces operating vibration and noise, realizing low-noise power supply operation, which will not cause noise pollution to the surrounding environment. It is equipped with standard pressure relief valves, oil level monitoring devices and temperature sensing systems, which can automatically release internal pressure and monitor operating status in real time to avoid equipment damage caused by overpressure and overheating. All structural designs comply with international safety standards, with zero open fire hazard during normal operation and high overall operation safety.
4.5 Simple Maintenance & High Cost Performance
This industrial three-phase oil immersed transformer has a simple and reliable internal structure without complex vulnerable electronic components, with low daily maintenance difficulty and low operation cost. It only needs regular oil quality inspection, oil level calibration and sealing performance detection, and supports long-term unattended operation. The dual-voltage integrated design saves equipment procurement and installation costs for users, and the durable structure reduces later replacement and maintenance investment, with comprehensive cost performance far exceeding traditional single-voltage power transformation equipment.
5. Frequently Asked Questions (FAQ)
Q1: What are the advantages of 69kV/10kV/440V dual-output oil immersed transformer compared with traditional single-voltage transformers?
Traditional single-voltage transformers can only realize one-way voltage conversion, which requires two sets of equipment to complete 69kV to 10kV and 69kV to 440V voltage stepping, occupying more installation space and increasing equipment investment and later maintenance costs. The 69kV input dual-output three phase oil immersed power transformer integrates two voltage output functions in one device, which can meet medium-voltage grid distribution and low-voltage equipment power supply at the same time. It features smaller floor space, simpler wiring system, lower failure rate, and more stable overall operation, which is more suitable for industrial bases and substations with multi-level power supply needs.
Q2: What working environments is this 69kV oil immersed power transformer suitable for?
This oil filled power transformer is mainly designed for outdoor and harsh industrial working environments. It adapts to the ambient temperature range of -40℃ to +45℃, and can operate stably in rainy, snowy, high-temperature, humid and dusty environments. It is very suitable for outdoor grid substations, heavy industrial parks, mining sites, new energy power stations and remote field engineering power supply scenarios. Due to the oil immersed structure, it is not recommended for fully enclosed indoor spaces with strict fire protection requirements; dry-type transformers can be selected as an alternative for indoor installation.
Q3: What key points need attention in daily operation and maintenance of the transformer?
Daily maintenance focuses on three core aspects. First, regularly check the transformer oil level and insulating oil quality to ensure the oil body is clear and free of deterioration, precipitation and moisture, so as to maintain stable insulation and heat dissipation performance. Second, inspect the oil tank welding seams, sealing parts and radiator components to eliminate hidden dangers of oil leakage and blockage, and clean surface dust regularly to ensure heat dissipation efficiency. Third, monitor the operating temperature, running noise and output voltage stability in real time, and regularly test the insulation resistance of high and low voltage windings. Timely troubleshooting of abnormal conditions can effectively extend the service life of the equipment and ensure continuous safe operation.
