Operation environment of 20V transformer and how to operate and maintain 220V transformer
Writer： Hengfeng you electric Time：2023-04-26 views：times
1. Ambient air temperature - 5 to 40, with the maximum monthly average temperature not exceeding 30.
2. The altitude of the installation site shall not exceed 1000m.
3. When the ambient air temperature is 40, the atmospheric relative humidity shall not exceed 50%, but at a lower temperature, the atmospheric relative humidity may be the same. The average maximum humidity in the wettest month is 90%, and the average monthly minimum temperature in this month is 25. Considering the condensation on the product surface caused by temperature change.
1. Prevent transformer from overload operation. If the overload lasts for a long time, the coil will heat up and the insulation will gradually deteriorate, resulting in interphase short circuit, interphase short circuit or short circuit to ground, and oil decomposition.
2. Ensure the quality of insulating oil. During the storage, transportation, operation and maintenance of transformer insulating oil, if the oil quality is poor or impurities and moisture are excessive, the insulation strength will be reduced. When the insulation strength decreases to a certain value, the transformer will be short circuited, causing sparks, arcs or dangerous temperatures. Therefore, the oil quality of the transformer shall be tested regularly during operation, and the unqualified oil shall be replaced in time. Add the security engineer website to favorites.
3. Prevent aging and damage of transformer core insulation. Aging of iron core insulation or damage of clamping bolt sleeve will generate large eddy currents in the iron core, causing long-term heating of the iron core and insulation aging.
4. Prevent accidental damage to insulation during maintenance. Pay attention to the protection coil or insulating sleeve when repairing the transformer core. If any scratch is found, it shall be handled in time.
5. Make sure that the wires are in good contact. Poor contact between internal connectors of coils, connection points between coils, contacts leading to bushings at high and low voltage sides and fulcrums on tap changers will lead to local overheating, insulation damage, short circuit or open circuit. At this time, the high-temperature arc generated will decompose the insulating oil and generate a large amount of gas, which will increase the pressure in the transformer. When the pressure exceeds the protection setting value of the gas circuit breaker without tripping, explosion will occur.
6. Prevent electric shock. The power supply of the transformer is generally from overhead lines, which are easy to be struck by lightning, and the transformer will be burned due to insulation breakdown.
7. Short circuit protection shall be reliable. When the coil or load is short circuited, the transformer will bear considerable short circuit current. If the protection system fails or the protection setting is too large, the transformer may be burnt. Therefore, reliable short-circuit protection device must be installed.
8. Keep good grounding. For the low-voltage system with neutral connection protection, the neutral point at the low-voltage side of the transformer shall be directly grounded. When the three-phase load is unbalanced, the current will appear on the zero line. When the current is too large and the contact resistance is large, the grounding point will produce high temperature and ignite the surrounding combustibles.
9. Prevent excessive temperature. During operation, the temperature change of the transformer shall be monitored. If the transformer coil conductor is Class A insulation, its insulator is mainly paper and cotton yarn, and the temperature has a great impact on the insulation and service life. The insulation life will be reduced by about 50% every time the temperature increases by 8. The transformer operates at normal temperature (90), with a service life of about 20 years. If the temperature rises to 105, the service life is 7 years. When the temperature rises to 120, the service life is only 2 years. Therefore, when the transformer of Qingdao Hengfengyou Electric Appliance Co., Ltd. is in operation, it is necessary to maintain good ventilation and cooling. If necessary, forced ventilation can be used to reduce the temperature rise of the transformer.
6-35kv oil immersed transformer, 6.6kv transformer, 11kv transformer, 15kv transformer, 20kv transformer, 33kv transformer. Thirty years of manufacturing experience. Hengfengyou Electric will provide you with the best transformer solution. CB CCC UL KEMA certification. It has been exported to Uzbekistan, Pakistan, Zimbabwe, Tanzania, Ethiopia, South Africa, Kuwait, Iraq, the United Arab Emirates, Vietnam, Spain and other countries and regions. More than 30 years of transformer manufacturing experience. Quick quotation and quick delivery. Hengfengyou Electric provides you with the best electrical product solutions. 【WhatsApp：+86158 5325 2696（Jack） +86158 5326 5269（Alisa） info@hengfengyou.com https://www.hengfengyou.com 】
