Corona is a type of partial discharge in generators, which occurs on the surface of insulation and is different from the corona near conductors under general outdoor high-voltage electric fields. It refers to the glow discharge caused by uneven electric field distribution and excessive local field strength on certain parts of the insulation surface of the high-voltage winding of the generator stator, which leads to ionization of nearby air. So where are the locations where generators are prone to corona discharge? Today, Dingbo Electric will provide a detailed explanation for everyone.
1. End band wrapping area.
2. At the slot of the wire rod. The winding slot is a typical sleeve type structure, and the slot electric field is very concentrated, making it the most prone to corona discharge.
3. Between the end opposite phase wire rods. The distribution of electric field at the end of the winding is complex, especially at the contact parts and edges between the coil and the end clamp, binding rope, and cushion block. Due to the process, it is often difficult to completely eliminate the air gap, and corona is also prone to occur in these air gaps.
4. Poor contact or air gap between the surface of the wire rod and the iron core slot.
5. At the ventilation duct of the iron core section. The ventilation channel steel has sharp edges, which can easily cause local unevenness in the electric field. In addition, it is worth noting that the generator corona is related to altitude and air humidity. The higher the altitude and the thinner the air, the lower the corona discharge voltage, while the humidity increases, the surface resistivity decreases, and the corona discharge voltage decreases. Therefore, in order to avoid the generation of corona, attention should be paid to the installation environment's sea wave height and air temperature.
The five aspects mentioned above are the locations where generators are prone to corona discharge. Have you gained any understanding through the above learning? Guangxi Dingbo Electric Power Equipment Manufacturing Co., Ltd. is a professional manufacturer of diesel generator sets. The company is equipped with well-known domestic and foreign brands such as Shangchai "Dongfeng" brand 135 series, Shandong Weichai 105 series, Jichai 190 series, Yuchai, Swedish Volvo, American Cummins, American QiangLu, South Korean Daewoo and other diesel engine manufacturers, as well as generator manufacturers such as Wuxi Siemens, Shanghai Fusong, and Lanzhou Electric.
Dingbo Power has advanced testing equipment, modern production technology, professional manufacturing technology, perfect quality management system, and strong technical research and development capabilities. It can provide 3KW～2500KW various specifications of ordinary, automatic, four protection, automatic switching, low noise and mobile generator sets, high quality and low energy consumption to meet the diverse power needs of customers, and can also meet users with different voltages and different frequencies. It is required to create a parallel power supply system for multiple units. If you are interested in our product or any question on generator, welcome to send email to sales@dieselgeneratortech.com.
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