基于振荡波的干式空心电抗器绝缘检测系统

针对干式空心电抗器匝间绝缘事故频繁发生的问题,提出了在振荡波下进行局部放电的绝缘检测方法,设计了一种能有效避免绝缘故障的干式空心电抗器绝缘检测系统.根据现场技术指标要求,通过MATLAB/Simulink搭建仿真模型确定系统中关键参数,利用试验平台对系统参数进行验证.结果表明,系统能有效地检测到故障电抗器两端电压振荡波的衰减和频率变化,通过引入局部放电检测手段,系统能清晰直观地检测出电抗器可能存在的微弱缺陷,及时发现干式空心电抗器早期绝缘故障,杜绝恶性事故的发生.

Theoretical analysis of tooth strength of cycloid-gear reducer

Fiction transfer pumping unit is an oil exploitation unit with high efficiency.The cycloid-gear reducer is one of the most important transmission components of the pumping unit by its smaller volume,lighter weight and effective transmission.The smooth running ability will directly affect the life of the pumping unit.In this paper,a tridimensional model of cycloidgear was set up with UG especially for this kind of reducer.Based on finite element theory,the stress of the gear profile was analyzed with the aid of ANSYS software.Then,taking the real part as an example,the max torque and stress of the cycloid-gear were obtained,with which the theoretical rule was provided for later optimum design of the reducer.