Before solving this problem, Starlight Technology first takes everyone to understand what the corona of a generator is. It refers to the glow discharge caused by the uneven distribution of electric field on certain parts of the insulation surface of the high-voltage winding of the generator stator, which leads to the ionization of nearby air due to local excessive field strength. It can be seen that corona is a kind of generator partial discharge, which is generated on the insulation surface, and is different from the corona near the conductor under the general outdoor high-voltage electric field.
Generally speaking, the parts of the generator that may generate external corona inside the machine include:
1. At the slot of the wire rod: The slot of the winding is a typical casing type structure, where the electric field is very concentrated and is the most prone place to generate corona.
2. At the binding point of the end clamp.
3. Poor contact or air gap between the surface of the wire rod and the inner groove of the iron core.
4. Between end out of phase bars: 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 process reasons, it is often difficult to completely eliminate the air gap, and corona is also prone to occur in these air gaps.
5. At the ventilation ditch of the iron core section: The ventilation channel steel has sharp edges, which can easily cause local unevenness of the electric field.
In addition, it is worth noting that generator corona is related to altitude and air humidity. The higher the altitude, 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 sea wave height and air temperature of the installation environment. Jiangsu Starlight Electricity Equipments Co.,Ltd. is a professional generator, diesel generator manufacturer, and one of the earlier manufacturers of domestic generators and diesel generator. Jiangsu Starlight Electricity Equipments Co.,Ltd. has first-class inspection equipment, advanced production processes, and professional manufacturing technology.
Jiangsu Starlight Electricity Equipments Co.,Ltd., as an OEM supporting manufacturer authorized by Cummins to provide Chinese diesel generator sets, has professional manufacturing technology, perfect quality management system and strong R&D technical strength. It can provide users with generator sets of various specifications from 15KW to 2500KW. It can also provide users with one-stop service of design, supply, debugging and maintenance at any time. welcome contact us by email email@example.com.