H61 Oil 33.33kv Power Transformer
Traduction pour : Transfo H61 20KV 160kVA B2 H61 Transformer 15(20)kV 160kVA B2 Three-phase MV / LV distribution transformer with MV and LV windings in wound copper power P = 160KVA - Compliance: NFC 52 100 - 52 112 and 52 113 standard or equivalent in substance - Natural cooling: ONAN - MV voltage adjustment: by switch off +/- 5% in five (5) positions - Type: on post H61 - Nominal power: 160KVA - Primary rated voltage: 20,000V ± 5% - Secondary voltage: 410V off-load between phases / 240V between phase and neutral - Frequency: 50Hz - Short-circuit voltage: 4% - No-load loss less than or equal to 300W - Load loss less than or equal to 2000W - Coupling: Dyn11 with output neutral - MV and LV crossings: in porcelain Usually exported to Africa
Opis
What is an oil immersed transformer?
The oil immersed transformer adopts three-dimensional wound iron core. Because its three iron core pillars are arranged in equilateral triangle three-dimensional, the winding is tight, the three magnetic circuits have the same length, and the magnetic circuit has no air gap. Shortest, core leg cross-sectional area closer to circular, further improving performance, reducing losses, reducing noise, balancing three terms, and reducing third harmonic components. But due to the pressure regulating switch being inside the water tank. When adjusting the pressure, the contacts of the switch cannot be seen from outside. There are two types of reaction phenomena: poor contact and open circuit. If the contact is not good, it is easy to burn out the switch when the load is too large.
Oil immersed transformers are important equipment in the power system, mainly used to change voltage and transmit electrical energy. Oil immersed transformers mainly operate based on the principle of electromagnetic induction. Suitable for power grid transformation in urban and rural areas, industrial and mining enterprises, and more suitable for combination transformers and pre installed substation transformers.
Operating temperature of oil immersed transformer
When the oil immersed transformer is working, it is necessary to ensure that the working temperature will not cause the transformer oil to deteriorate too quickly, thus increasing the operating cost. When the operating temperature of the oil immersed transformer reaches 85 degrees Celsius, an alarm will be triggered. When the maximum temperature reaches 95 degrees Celsius, the switch of the transformer will be turned off.
Therefore, it is stipulated that the oil temperature at the upper working temperature of oil immersed transformers cannot exceed 85 ℃. The rated capacity of a transformer refers to the maximum power allowed for long-term continuous operation when the transformer can achieve economically reasonable efficiency and normal expected service life under the specified environmental temperature. The specified environmental temperature for transformers is a maximum temperature of 40 ℃, a maximum daily average temperature of 30 ℃, a maximum annual average temperature of 20 ℃, a minimum temperature of -25 ℃ for outdoor transformers, and -5 ° C for indoor transformers.
According to operating experience and specialized research, when the insulation temperature of the transformer winding is within the range of 80-140 ℃, the insulation life loss doubles and the service life decreases by half for every 6 ℃ increase. This is the 6 ° C rule for transformer operation. The maximum allowable temperature for long-term operation of transformer windings is the normal service life temperature, and the maximum allowable value for winding hot spot temperature is the safe temperature.
In order to achieve the most economical service life of insulation materials, they are divided into different heat resistance levels such as Y, A, E, B, F, H, C, etc. based on their maximum allowable working temperature. Normal situation. The maximum allowable working temperature for Y-class insulation is 90 ℃, A-class is 105 ℃, E-class is 120 ℃, B-class is 130 ℃, F-class is 155 ℃, H-class is 180 ℃, and C-class is above 180 ℃.
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