25000 KVA 3-Phase Duplex Winding Oil Liquid Type Transformer 110kV to 10.5kV
25000 KVA 3-Phase Duplex Winding Oil Liquid Type Transformer 110kV to 10.5kV
1. Product Description
This 25000 KVA 3-phase duplex winding oil liquid type transformer is a medium-to-high voltage power transformation equipment professionally designed for 110kV to 10.5kV voltage step-down conversion. As a core model of three-phase double-winding oil immersed power transformer in the 110kV voltage level, it features a rated capacity of 25MVA, matching a high voltage input of 110kV and a low voltage output of 10.5kV, fully adapting to mainstream medium and high voltage power grid power distribution standards. Adopting mature oil-immersed cooling and insulation technology, the equipment takes high-purity transformer oil as the cooling and insulating medium, integrating dual functions of electrical insulation and heat dissipation to ensure stable and continuous operation under full-load and long-term working conditions.
Different from single-winding transformer equipment, this duplex winding power transformer adopts an independent double-winding structural design, with completely isolated high-voltage and low-voltage windings, which effectively avoids voltage crosstalk and current interference. The whole machine complies with international IEC standards and national power industry specifications, and undergoes strict vacuum oil injection treatment and partial discharge testing before leaving the factory, with partial discharge control strictly within the industry standard range. It supports multiple cooling modes including ONAN natural oil cooling and ONAF forced air cooling, and can be adjusted according to on-site load changes and environmental conditions, with strong operational adaptability. This industrial-grade oil immersed step-down transformer is widely customized for grid power distribution, new energy power generation and industrial power supply scenarios, and is one of the most reliable 110kV level power transformation equipment for medium-capacity power regulation.
2. Core Product Uses
The core function of this 25000 KVA 110kV/10.5kV three-phase duplex winding oil liquid transformer is to complete efficient voltage conversion and power transmission in the power system, realizing the step-down of 110kV high-voltage grid electric energy to 10.5kV medium-voltage electric energy that meets the needs of terminal power distribution and industrial equipment operation. It undertakes the key link of power energy conversion, power flow regulation and grid voltage stabilization in the power supply system, and is an indispensable core equipment for connecting high-voltage transmission grids and medium-voltage distribution networks.
In daily operation, this high-efficiency low-loss power transformer can balance grid load fluctuations, stabilize output voltage accuracy, and avoid power supply instability caused by peak load changes. It can effectively reduce electric energy loss during power transmission, improve the overall power supply efficiency of the system, and reduce long-term operation and power consumption costs for users. In addition, the equipment has strong short-circuit resistance and overload operation capacity, which can cope with instantaneous grid faults and peak power consumption periods, ensure continuous and stable power supply for the system, and provide safe and reliable power guarantee for subsequent power distribution equipment and power consumption terminals. As a key equipment for power grid voltage regulation and energy transmission, it also supports centralized power distribution and decentralized power supply modes, meeting the diversified power consumption needs of different industries.
3. Main Application Scenarios
This 25MVA oil immersed double-winding step-down transformer has wide applicability, covering municipal power grid construction, new energy power generation, industrial and mining enterprise power supply, chemical park power distribution and other core fields, and can adapt to various indoor and outdoor harsh operating environments.
3.1 Urban and Rural Power Grid Substation Projects
It is widely used in 110kV urban hub substations and rural centralized power supply substations, responsible for converting high-voltage electric energy from the regional main grid into 10.5kV medium-voltage electric energy for urban community power distribution, urban public facility power supply and rural industrial and residential power consumption. It effectively solves the problem of voltage matching in regional power supply, improves the coverage and stability of urban and rural power grids, and is the mainstream supporting equipment for urban power grid upgrading and rural power grid reconstruction projects.
3.2 New Energy Power Generation Boosting and Power Distribution
It is applicable to supporting power transformation equipment for large-scale photovoltaic power stations, onshore wind farms and distributed new energy power generation projects. The electric energy generated by new energy units is converted and stabilized by this 110kV to 10.5kV three-phase transformer, realizing grid-connected power transmission and local power distribution. Its stable voltage output and strong anti-interference ability can adapt to the intermittent and fluctuating power generation characteristics of new energy, effectively improving the grid-connected quality of new energy power.
3.3 Large Industrial and Mining Enterprise Power Supply
It serves as a general step-down power transformer for heavy industrial enterprises such as metallurgy, building materials, mining and machinery manufacturing. Large industrial equipment usually requires stable 10kV level power supply, and this 25000 KVA high-capacity oil-immersed transformer can meet the continuous high-load power consumption demand of industrial production lines, avoid production shutdown risks caused by voltage instability, and provide reliable power guarantee for industrial centralized production.
3.4 Petrochemical and Industrial Park Power Distribution
It is suitable for closed power distribution systems of petrochemical enterprises, chemical industrial parks and logistics industrial parks. The equipment has excellent sealing performance, corrosion resistance and environmental adaptability, can operate stably in flammable, dusty and high-temperature industrial environments for a long time, and meets the safe power supply standards of special industrial parks.
3.5 Infrastructure and Public Engineering Projects
It provides supporting power transformation services for large-scale infrastructure projects such as railway transit, airport hubs, water conservancy projects and municipal engineering. It ensures stable power supply for public infrastructure operation, emergency power guarantee and daily operation and maintenance, and supports the safe and efficient operation of urban public service systems.
4. Outstanding Product Features
4.1 Low Loss and High Energy Efficiency, Cost-Effective Operation
This energy-saving oil immersed transformer adopts high-quality oriented silicon steel sheets and oxygen-free copper winding wires as core conductive and magnetic conductive materials. The optimized iron core lamination process and winding structure design effectively reduce no-load loss and load loss, with no-load loss 10%-15% lower than the industry standard and load loss 5%-8% lower than similar products. The overall operation energy consumption is low, which can significantly reduce the long-term power operation cost for users, and it is a typical energy-saving and environment-friendly power transformation equipment suitable for long-term continuous operation.
4.2 Excellent Insulation and Sealing Performance, High Operational Safety
The whole machine adopts a fully sealed double-layer sealing structure, with high-strength stainless steel oil tank and professional sealing accessories, which completely isolates transformer oil from air, effectively preventing oil oxidation, moisture ingress and oil leakage faults. Through advanced vacuum oil injection technology and strict partial discharge detection, the internal partial discharge value is controlled within a safe range, and the insulation performance is stable and reliable. The high-grade insulating materials are matched to form a perfect electric field distribution structure, which can resist lightning impulse and overvoltage impact, effectively reducing the risk of insulation breakdown and ensuring long-term safe operation of the equipment.
4.3 Strong Structural Stability and Short-Circuit Resistance
The duplex winding structure is mechanically reinforced in an all-round way, with optimized longitudinal insulation and structural support design, which can withstand 3 times the rated short-circuit current impact. The integrated clamping and fixing structure of the iron core and windings avoids displacement and deformation of internal components caused by short-circuit impact and long-term vibration. The whole machine has strong mechanical stability and anti-fatigue ability, can cope with sudden grid short-circuit faults and frequent load fluctuations, and greatly improves the operational reliability and service life of the equipment.
4.4 Flexible Cooling Mode and Strong Environmental Adaptability
Support dual cooling modes of ONAN natural oil natural cooling and ONAF forced air cooling, which can automatically adjust the heat dissipation efficiency according to the operating load and ambient temperature. The efficient circulating heat dissipation system of transformer oil ensures that the equipment maintains a stable temperature rise under full-load and overload operation, avoiding equipment aging and failure caused by overheating. It can adapt to the ambient temperature range of -40℃ to +45℃, and can operate stably in high temperature, low temperature, dusty and other complex outdoor and indoor environments, with wide regional adaptability.
4.5 Low Noise and Low Vibration, Environmentally Friendly Operation
Through optimized iron core clamping technology and noise reduction structural design, the vibration and noise generated during the operation of the three-phase transformer are effectively suppressed. The overall operating noise is far lower than the industry standard, which will not cause noise pollution to the surrounding living and production environment. It meets the environmental protection assessment standards of urban substations and residential surrounding power facilities, and is more suitable for popularization and application in densely populated areas.
4.6 Low Maintenance Cost and Long Service Life
The fully sealed structure design avoids frequent oil replacement and internal cleaning maintenance caused by oil deterioration and moisture absorption. The high-quality raw materials and precise manufacturing process ensure that the internal components have strong anti-aging and anti-corrosion capabilities. The equipment has stable performance in long-term operation, low failure rate, simple daily maintenance, greatly reduced later operation and maintenance costs, and a design service life of up to 30 years, with extremely high operational cost performance.
5. Frequently Asked Questions (FAQ)
5.1 What cooling modes does the 25000 KVA 110kV to 10.5kV duplex winding transformer support?
This three-phase oil liquid type transformer supports two mainstream cooling modes: ONAN natural oil natural cooling and ONAF forced air cooling. Under conventional light and medium load operating conditions, the ONAN mode can meet the heat dissipation demand, with low energy consumption and quiet operation. When the equipment runs at full load or overload for a long time, the ONAF forced air cooling mode can be started to accelerate heat circulation and heat dissipation, effectively control the operating temperature rise of the equipment, and ensure stable operation under high load conditions. Users can switch the cooling mode according to on-site load changes and environmental conditions, with flexible and convenient operation.
5.2 What are the main maintenance items for this oil immersed step-down transformer in daily operation?
This fully sealed oil immersed transformer has low daily maintenance difficulty and cost. The core daily maintenance items include regular inspection of the oil tank sealing performance to check for oil leakage and seepage, regular detection of transformer oil quality and insulation performance, and real-time observation of equipment operating temperature, noise and voltage and current operation data. In addition, it is necessary to regularly clean the external dust and sundries of the equipment and check the fastening state of wiring terminals and structural parts. Since the equipment adopts a fully sealed structure, it is not necessary to replace the transformer oil frequently, which greatly reduces the later maintenance workload compared with traditional open-type transformers. It is recommended to conduct a comprehensive performance inspection every 1-2 years to eliminate potential faults in advance.
5.3 What load and environmental conditions are suitable for this 25MVA double-winding transformer?
This transformer is designed for medium and high-capacity continuous power supply scenarios, with a rated capacity of 25000 KVA, supporting long-term stable full-load operation and short-term overload operation. It can withstand 1.5 times rated capacity operation for 6 hours and 1.75 times rated capacity operation for 3 hours, adapting to peak power consumption impact. In terms of environment, the equipment can operate stably in the temperature range of -40℃ to +45℃, and adapt to outdoor open-air substations, indoor distribution rooms, industrial parks and other scenarios. It has good dust resistance, corrosion resistance and weather resistance, and can cope with most conventional and slightly harsh operating environments, but it should avoid long-term operation in extremely corrosive and high-humidity non-ventilated environments.
