부산대학교 도서관

The smoothing reactor is a commonly used electrical equipment in the power system, and it is prone to turn-to-turn insulation faults in long-term operation. The inter-turn insulation and solidified insulation have the problem of mutual matching due to different materials. In this paper, the operating state of the smoothing reactor is optimized by controlling the inter-turn insulation thickness of the smoothing reactor. A two-dimensional axisymmetric model of a typical smoothing reactor with coil turns as the smallest unit is established. The finite element simulation of multi-physical field coupling is used to calculate the influence of inter-turn insulation thickness on the electric field, hot spot temperature and inter-turn stress distribution of the winding in the reactor encapsulation. The results show that when the inter-turn insulation thickness increases from 0.1 mm to 1.0 mm, the extreme value of the inter-turn electric field intensity in the encapsulation selected in the DC case is reduced by about 10 times, and the extreme value of the electric field intensity in the case of high harmonics is reduced by 1.7 %. The selected encapsulation hot spot temperature increased by about 25 %, and the inter-turn stress extreme value increased by about 2 times. Therefore, it is proposed to determine the optimal thickness of the inter-turn insulation by calculating the extreme value of the inter-turn electric field strength of the inner winding of the reactor envelope, and to evaluate the operation state of the reactor through the temperature field and stress field, so as to optimize the operation state of the dry-type air-core smoothing reactor.