| Customization: | Available |
|---|---|
| Application: | Electronic, Instrument |
| Phase: | Three |
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Oil-Immersed Transformer is a power transformer that uses insulating oil as a cooling and insulating medium and is widely used in power systems. The following is a detailed introduction:
1. Basic structure
Oil-Immersed Transformer mainly consists of the following parts:
Iron core: usually made of laminated silicon steel sheets, used to provide magnetic circuit and reduce energy loss.
Winding: including high-voltage winding and low-voltage winding, wound by copper or aluminum wire, used to transmit electrical energy.
Insulating oil: usually mineral oil or synthetic oil, plays the role of insulation and cooling.
Oil tank: The shell that holds the iron core, winding and insulating oil, usually welded by steel plates.
Heat dissipation device: such as heat sink, heat pipe or cooling fan, used to enhance the heat dissipation effect.
Protective device: including oil level gauge, thermometer, pressure relief valve and gas relay (such as Buchholz relay), used to monitor and protect the operation of the transformer.
2. Working Principle
Oil-type transformers work based on the principle of electromagnetic induction:
When alternating current passes through the high-voltage winding, an alternating magnetic field is generated.
The magnetic field is transmitted to the low-voltage winding through the iron core, inducing voltage.
The insulating oil plays an insulating and cooling role in the process to prevent the winding from overheating.
3. Main features
Efficient cooling: The insulating oil has good thermal conductivity and can effectively reduce the operating temperature of the transformer.
High insulation performance: The insulating oil can not only cool, but also improve the insulation strength between the windings.
Large capacity design: Oil-type transformers are usually used in medium and high voltage power systems, with a capacity ranging from several thousand volt-amperes (kVA) to hundreds of megavolt-amperes (MVA).
Long life: Under normal operating conditions, the service life of oil-type transformers can reach 20-30 years or even longer.
4. Application scenarios
Power system: used in substations and distribution stations to achieve voltage rise and fall and power distribution.
Industrial field: Provide power support for large factories, mines, etc.
Renewable energy: used in new energy power generation systems such as wind farms and solar power stations.
Urban power supply: as the core equipment of urban power distribution networks.
5. Advantages
Good heat dissipation performance: suitable for long-term high-load operation.
Strong insulation performance: able to withstand higher voltage levels.
High reliability: simple structure and easy maintenance.
Main Technical Parameters
| Rated Capacity KVA |
Voltage Combination | Connection Symbol | Off-load Loss(KW) | On-load Loss(KW) (75ºC) |
Short Circuit Impendance(%) | Impendance (%) |
Weight(KG) | Dimensions(mm) | |||||
| High Voltage (KV) |
Tapping Range (%) |
Low Voltage (KV) |
Oil | Total | Length | Width | Height | ||||||
| 30 | 20 22 24 |
±5 ±2×2.5 |
0.23 0.38 0.4 0.44 0.48 0.6 |
Dyn11 Yyn0 |
0.1 | 0.66 | 2.1 | 5.5 | 90 | 345 | 860 | 565 | 1000 |
| 50 | 0.13 | 0.96 | 2 | 105 | 415 | 895 | 590 | 1040 | |||||
| 63 | 0.15 | 1.145 | 1.9 | 110 | 520 | 889 | 630 | 1055 | |||||
| 80 | 0.18 | 1.37 | 1.8 | 120 | 530 | 890 | 690 | 1070 | |||||
| 100 | 0.2 | 1.65 | 1.6 | 135 | 565 | 925 | 670 | 1090 | |||||
| 125 | 0.24 | 1.98 | 1.5 | 130 | 670 | 1045 | 680 | 1110 | |||||
| 160 | 0.29 | 2.42 | 1.4 | 145 | 680 | 1135 | 715 | 1140 | |||||
| 200 | 0.33 | 2.86 | 1.3 | 160 | 790 | 1220 | 790 | 1170 | |||||
| 250 | 0.4 | 3.35 | 1.2 | 175 | 895 | 1290 | 855 | 1200 | |||||
| 315 | 0.48 | 4.01 | 1.1 | 220 | 1150 | 1375 | 910 | 1250 | |||||
| 400 | 0.57 | 4.73 | 1 | 220 | 1225 | 1420 | 950 | 1260 | |||||
| 500 | 0.68 | 5.66 | 1 | 290 | 1525 | 1540 | 1035 | 1260 | |||||
| 630 | 0.81 | 6.82 | 0.9 | 6 | 335 | 1885 | 1625 | 1110 | 1340 | ||||
| 800 | 0.98 | 8.25 | 0.8 | 430 | 2335 | 1880 | 1050 | 1360 | |||||
| 1000 | 1.15 | 11.33 | 0.7 | 575 | 2610 | 1800 | 1050 | 1550 | |||||
| 1250 | 1.35 | 13.2 | 0.6 | 490 | 2770 | 1825 | 1285 | 1540 | |||||
| 1600 | 1.63 | 15.95 | 0.6 | 755 | 3705 | 1905 | 1340 | 1540 | |||||
| 2000 | 1.95 | 19.14 | 0.6 | 910 | 4355 | 1970 | 1395 | 1640 | |||||
| 2500 | 2.34 | 22.22 | 0.5 | 990 | 4865 | 2095 | 1445 | 1840 | |||||
The low-voltage winding of oil-immersed transformer generally adopts the cylindrical structure with copper foil around the shaft except copper wire for small capacity. The high-voltage winding adopts multi-layer cylindrical structure, so that the ampere-turns distribution of the winding is balanced, with small magnetic flux leakage, high mechanical
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