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Oil immersed transformer
Oil-immersed transformer
Oil immersed transformer is the core electrical energy conversion equipment in the power system, which uses transformer oil as insulation and heat dissipation medium, and achieves the rise and fall of AC voltage through electromagnetic induction principle. It is widely used in various power transmission, distribution and consumption scenarios. Its core structure consists of components such as iron core, winding, oil tank, radiator, insulation oil, and sleeve.
It has the characteristics of wide capacity coverage, strong operational stability, and diverse adaptation scenarios. Different voltage levels (10kV-35kV) and capacity specifications can be customized according to user needs, meeting the power transmission and distribution needs of various fields such as industrial production, urban distribution, and new energy grid connection. It is a key infrastructure for the safe and efficient operation of the power system.
Features
1. Excellent insulation and heat dissipation performance:
High quality transformer oil is used as the insulation and heat dissipation medium, with high insulation strength and outstanding heat dissipation efficiency, which can effectively reduce the temperature rise during equipment operation, avoid insulation aging, extend equipment service life, and adapt to high load, long-term continuous operation scenarios.
2. Strong operational stability and low failure rate:
The core components are made of high-quality silicon steel sheets and oxygen free copper windings. After strict vacuum drying and oil immersion treatment, the sealing is good and can effectively resist external environmental influences such as moisture, dust, and electromagnetic interference. The long-term operational failure rate is lower than the industry average, reducing operation and maintenance costs.
3. Wide capacity coverage and strong adaptability:
The capacity can be flexibly customized from tens of kVA to tens of MVA, with voltage levels covering medium and low voltage, high voltage, and ultra-high voltage. It can meet the power distribution needs of small factories and residential areas, as well as the power transmission needs of large industrial parks and power grid main lines, with strong universality.
4. Significant energy-saving effect and low loss:
Optimized the design of the iron core and winding structure, using low loss silicon steel sheets and high-efficiency winding technology to reduce no-load and load losses, in line with national energy-saving standards. Long term operation can significantly save electricity consumption, and it is both economical and environmentally friendly.
5. Convenient maintenance and long service life:
The equipment structure is mature, and daily maintenance mainly focuses on regularly checking the insulation oil quality and cleaning the radiator, with easy operation; Under normal use, the service life can reach 20-30 years, providing users with long-term stable power conversion guarantee.
If you need to know the specific technical parameters (such as rated capacity, rated voltage, short-circuit impedance, loss value, etc.), customized solutions, product quotations, installation and commissioning processes, and after-sales support services of oil immersed transformers, you can contact our professional technical consultants. We will provide one-on-one technical support and personalized solutions based on your actual application scenario, and can also provide product testing reports, qualification certificates, and other related documents.
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Specification
| kVA | High Voltage (kV) | Low Voltage (kV) | Vector Group | Losses (kw) | No-load Current (%) | Weight（kg） | Overall dimension (mm) | ||||
| No-load loss | Load loss | Oil Weight | Total Weight | L | W | H | |||||
| 630 | 30 33 34.5 35 36 38.5 or others |
6.3 6.6 11 15 or others |
Yd11
Dyn11 |
0.83 | 7.86 | 0.65 | 965 | 3750 | 2460 | 1130 | 2660 |
| 800 | 0.98 | 9.4 | 0.65 | 1015 | 3800 | 2480 | 1190 | 2680 | |||
| 1000 | 1.15 | 11.5 | 0.65 | 1120 | 4320 | 2480 | 1300 | 2700 | |||
| 1250 | 1.40 | 13.9 | 0.55 | 1270 | 4755 | 2490 | 1360 | 2745 | |||
| 1600 | 1.69 | 16.6 | 0.45 | 1500 | 5860 | 2490 | 1410 | 2950 | |||
| 2000 | 2.17 | 18.3 | 0.45 | 1550 | 5965 | 2510 | 2420 | 2300 | |||
| 2500 | 2.56 | 19.6 | 0.45 | 1655 | 7000 | 2580 | 2785 | 3080 | |||
| 3150 | 3.04 | 23 | 0.45 | 1710 | 7840 | 2640 | 2850 | 3115 | |||
| 4000 | 3.61 | 27.3 | 0.45 | 2300 | 9600 | 2890 | 3000 | 3135 | |||
| 5000 | 4.32 | 31.38 | 0.45 | 2200 | 11000 | 3050 | 2500 | 3050 | |||
| 6300 | 5.25 | 35.06 | 0.45 | 2700 | 13000 | 3100 | 2760 | 3100 | |||
| 8000 | 7.2 | 38.48 | 0.35 | 3200 | 15700 | 3350 | 3050 | 3250 | |||
| 10000 | 8.7 | 45.32 | 0.35 | 3500 | 18000 | 3450 | 3300 | 3350 | |||
| 12500 | 10.8 | 53.87 | 0.3 | 3900 | 20800 | 3600 | 3500 | 3400 | |||
| 16000 | 12.16 | 65.84 | 0.3 | 4400 | 24500 | 3800 | 3600 | 3650 | |||
| 20000 | 14.4 | 79.52 | 0.3 | 4300 | 30000 | 4000 | 3850 | 3850 | |||
| 25000 | 17.02 | 94.05 | 0.25 | 6500 | 36300 | 4200 | 4000 | 4000 | |||
| 31500 | 20.22 | 112.86 | 0.25 | 8000 | 44000 | 4350 | 4150 | 4200 | |||
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FAQs
Is it necessary to regularly replace the transformer oil during the daily operation of oil immersed transformers?
Regular inspection and replacement based on oil quality are required. Normally, after 1-2 years of operation, new equipment needs to undergo its first oil quality inspection (to detect indicators such as dielectric loss, moisture, breakdown voltage, etc.), and then every 1-2 years thereafter; If the oil quality deteriorates or the insulation performance decreases during testing, it is necessary to filter or replace it in a timely manner to ensure the insulation and heat dissipation effect of the equipment and avoid faults.
What are the core differences between oil immersed transformers and dry-type transformers?
The core difference lies in the insulation and heat dissipation medium: oil immersed type uses transformer oil as the medium, with high heat dissipation efficiency and larger capacity, suitable for outdoor and high load scenarios, but requires good sealing protection; Dry type insulation mainly uses solid insulation materials such as epoxy resin, which has better fire resistance and no oil pollution. It is suitable for indoor environments with high environmental requirements (such as office buildings and hospitals), but its capacity and heat dissipation ability are relatively limited.
What could be the possible cause of high oil temperature in oil immersed transformers during operation?
There are four common reasons: ① Overloading, operating beyond the rated capacity of the transformer; ② Blocked radiator, excessive dust accumulation, and poor heat dissipation; ③ Insufficient or deteriorated transformer oil, resulting in decreased heat dissipation efficiency; ④ Malfunctions in the iron core and winding (such as short circuits) result in increased losses and a sudden rise in oil temperature. When the oil temperature is too high, the load should be immediately reduced and the cooling system checked. If the problem is not solved, the machine should be stopped to troubleshoot.
What are the requirements for the installation environment when installing oil immersed transformers?
The installation environment should meet three requirements: ① For outdoor installation, choose an area with high terrain, dry and ventilated conditions, no standing water, and away from flammable and explosive materials, and take measures to prevent rain, dust, and collision; ② Indoor installation should ensure good ventilation in the computer room, reserve sufficient maintenance space (usually no less than 1.5 meters on both sides), and avoid moisture and dust accumulation; ③ The installation area should be kept away from strong electromagnetic interference and vibration sources to avoid affecting the stability of equipment operation.
What is the usual warranty period for oil immersed transformers? What after-sales guarantees are provided during the warranty period?
The regular product warranty period is 1-2 years (can be extended according to the contract agreement); During the warranty period, if the equipment malfunctions due to its own quality problems (non-human damage, force majeure), our company will provide free repair and replacement services for faulty parts, and arrange professional personnel to come to inspect and debug to ensure that the equipment quickly resumes operation; In addition, free technical consultation and operation guidance services are also provided.
Related Applications
In the field of power grid transmission: as the core equipment of the main line of the power grid, it is used for voltage conversion between high-voltage transmission lines and medium and low voltage distribution networks. For example, in the construction of regional power grids, converting high-voltage electrical energy (such as 110kV, 220kV) output by power plants into medium voltage electrical energy (such as 10kV, 35kV), transmitting it to various regional distribution centers, and further reducing the voltage before supplying it to users is a “bridge” for long-distance and efficient transmission of electrical energy, ensuring the stability and reliability of power grid supply.
Industrial production field: widely used in power distribution systems of various factories and industrial parks. For example, in large factories such as chemical, metallurgical, and mechanical manufacturing, the main distribution room of the factory uses oil immersed transformers to convert 10kV high-voltage electrical energy input from the power grid into 380V/220V low-voltage electrical energy, providing power for production equipment, motors, instruments, etc. in the workshop, meeting the different voltage requirements of various equipment in industrial production, while ensuring the continuous and stable operation of production equipment and avoiding production interruptions caused by unstable voltage.
Urban and residential power distribution field: used for power distribution supply in urban residential areas, commercial complexes, and municipal facilities. For example, in large residential communities, oil immersed transformers are installed in the distribution room to reduce the 10kV high-voltage electricity transmitted by the power grid to 380V three-phase electricity and 220V single-phase electricity, which are respectively supplied to household appliances, elevators, lighting, fire protection and other equipment in residents’ homes, ensuring the normal use of electricity for residents’ daily life and public facilities in the community, and adapting to the characteristics of dense population and large fluctuations in electricity load in the community.
New energy grid connection field: Adapt to the electricity grid connection needs of new energy generation projects such as photovoltaics and wind power. For example, in large-scale photovoltaic power plants, the direct current generated by photovoltaic modules is converted into alternating current by inverters. Low voltage alternating current (such as 400V) needs to be stepped up to high-voltage alternating current (such as 110kV, 220kV) through oil immersed transformers, and then connected to the public grid to achieve efficient transmission and grid connection of new energy electricity, solving the problem of low voltage and inability to directly connect to the grid for new energy generation.
In the field of municipal and infrastructure: applied to municipal facilities such as road lighting, rail transit, and sewage treatment. For example, in urban rail transit projects, oil immersed transformers provide stable voltage support for the lighting, ventilation, power supply systems, and train traction equipment of subway stations. They convert high-voltage electrical energy from the power grid into medium and low voltage electrical energy required by the equipment, ensuring the safe and orderly operation of rail transit; In sewage treatment plants, provide adaptive voltage for water pumps, aeration equipment, etc., to help stabilize the sewage treatment process.
