介绍了目前常用的GIS带电检测技术手段及检测方法,给出了一种精确缺陷定位方法。结合利用带电检测技术发现的500 k V HGIS设备潜伏性缺陷的典型案例,对特高频及超声波检测、气体成分分析、红外热像检测、声电联合定位技术等带电检测技...介绍了目前常用的GIS带电检测技术手段及检测方法,给出了一种精确缺陷定位方法。结合利用带电检测技术发现的500 k V HGIS设备潜伏性缺陷的典型案例,对特高频及超声波检测、气体成分分析、红外热像检测、声电联合定位技术等带电检测技术手段的实际应用进行了详细分析,通过解体验证了综合检测手段的有效性和检测结果的正确性。展开更多
A two degrees of freedom (DOF) positioning stage using novel linear ultrasonic motors is presented. The stage mainly consists of two linear ultrasonic motors, linear guides and tables. It can realize the long stroke...A two degrees of freedom (DOF) positioning stage using novel linear ultrasonic motors is presented. The stage mainly consists of two linear ultrasonic motors, linear guides and tables. It can realize the long stroke and reversible controlled motion in two directions. The wheel-shape linear ultrasonic motor applied in the stage utilizes two fourth-bending modes of non-uniform beam in orthogonal directions. Quick response, no backlash, high resolution, power-off self-braking, and long stroke are the attractive characteristics of the linear positioning stage. Experimental results show that z and y-direction tables can reach the destination without overshoot and the error is less than 2μm by using two linear encoders with a resolution of 1 μm. In the open-loop mode, the positioning stage achieves 1μm resolution at 0. 25 ms driving time.展开更多
文摘介绍了目前常用的GIS带电检测技术手段及检测方法,给出了一种精确缺陷定位方法。结合利用带电检测技术发现的500 k V HGIS设备潜伏性缺陷的典型案例,对特高频及超声波检测、气体成分分析、红外热像检测、声电联合定位技术等带电检测技术手段的实际应用进行了详细分析,通过解体验证了综合检测手段的有效性和检测结果的正确性。
基金the National Natural Science Foundation of China (50735002)~~
文摘A two degrees of freedom (DOF) positioning stage using novel linear ultrasonic motors is presented. The stage mainly consists of two linear ultrasonic motors, linear guides and tables. It can realize the long stroke and reversible controlled motion in two directions. The wheel-shape linear ultrasonic motor applied in the stage utilizes two fourth-bending modes of non-uniform beam in orthogonal directions. Quick response, no backlash, high resolution, power-off self-braking, and long stroke are the attractive characteristics of the linear positioning stage. Experimental results show that z and y-direction tables can reach the destination without overshoot and the error is less than 2μm by using two linear encoders with a resolution of 1 μm. In the open-loop mode, the positioning stage achieves 1μm resolution at 0. 25 ms driving time.