Performance characteristics and inspection of oil immersed transformer
Writer： Hengfeng you electric Time：2023-04-13 views：times
Oil immersed transformer is widely used in various distribution equipment because of its excellent performance, and has been unanimously praised by many users. Maybe you don't know much about this transformer. It doesn't matter. The following small series will introduce this product to you from two aspects: the performance characteristics and installation inspection of oil immersed transformer.
Performance characteristics and inspection of oil immersed transformer
a. The low-voltage winding of oil immersed transformer generally adopts the cylindrical structure of copper foil winding except that copper conductor is used for small capacity; The high-voltage winding adopts multi-layer cylindrical structure, so that the ampere turn distribution of the winding is balanced, the magnetic leakage is small, the mechanical strength is high, and the short-circuit resistance is strong.
b. The iron core and winding adopt fastening measures respectively. The fastening parts such as the height of the device and the low-voltage lead are equipped with self-locking locknuts. The non hanging core structure is adopted, which can withstand the bump of transportation.
c. The coil and iron core are vacuum dried, and the transformer oil is vacuum filtered and filled to reduce the moisture inside the transformer.
d. The oil tank adopts corrugated sheet, which has breathing function to compensate for the volume change of oil caused by temperature change. Therefore, the product has no oil conservator, which obviously reduces the height of the transformer.
e. Because the corrugated sheet replaces the oil conservator, the transformer oil is isolated from the outside, which effectively prevents the entry of oxygen and water from leading to the decline of insulation performance.
f. According to the above five performances, the oil immersed transformer does not need to change oil during normal operation, which greatly reduces the maintenance cost of the transformer and prolongs the service life of the transformer.
Inspection of oil immersed transformer
1. After long-distance transportation, the transformer will be subject to large vibration, and the body inspection is required. The transformer body inspection is divided into hanging core and hanging cover. Whether the hanging core or hanging cover, the inspection contents are consistent. The hanging core inspection shall be completed within one working day to speed up the inspection process.
2. Take the hanging core inspection as an example: ⑴ the hanging core of transformer shall be carried out indoors. If there is a tent outdoors, it is prohibited to hang the core in case of rain, snow, fog, wind and sand. (2) the temperature of the hanging core in winter shall not be lower than zero, otherwise the transformer shall be heated to make the iron core temperature 10 ℃ higher than the surrounding temperature. (3) the shorter the time the iron core is exposed to the air, the better. It shall not exceed 16 hours when the relative humidity is 65% and 12 hours when the relative humidity is 25%. The calculation time is from oil discharge to oil injection. (4) when the relative humidity of the weather exceeds 75%, it is not allowed to lift the core for inspection. (5) during the core inspection, pay attention to prevent parts and tools from falling into the oil tank.
Oil immersed transformer is an important equipment in the power supply and distribution system of industrial and mining enterprises and civil buildings. Its correct installation and use is related to the personal safety of every consumer, so it can not be ignored. The above is the introduction of oil immersed transformer. I hope it can be helpful for you to check oil immersed transformer.
