中文摘要：

局部放电（PD）是电力变压器绝缘劣化的主要原因,对局部放电进行定位有助于加强电力系统的安全运行。为此,研制了一种用于变压器中局部放电定位的、可重复布置的复合传感器,并对它进行了实验研究。该传感器由13阵元的L形超声阵列与超高频电磁传感器共形地组成,应用高阶累积量处理技术对L形阵列进行扩展后可使之具有97个虚拟阵元的性能,提高了超声阵列的孔径和方向锐度。在局部放电实验平台上进行了定位实验,结果表明该复合传感器能很好地识别及定位单个或多个局部放电源,定位的平均相对误差分别为2.1%和5.1%。对较少阵元数的阵列实施虚拟扩展利于形成微型化复合传感器,为阵列技术在电力设备监测中的实用化奠定了基础。

英文摘要：

Partial discharge （PD） is a main reason for the deterioration of power transformer insulation. Locating PD helps the safe operation of power systems. Therefore, we designed a re-locatable combined sensor to locate PD in transformer, and tested the sensor by PD locating experiments. The sensor is comprised of a conformal L-shape ultrasonic array of 13 array elements and an ultra high frequency （UHF） electromagnetic sensor. Being expended with high-order cumulants processing technology, the L-shape array can function as 97 virtual elements, which considerably improves the aperture and direction sharpness of the array. Moreover, PD locating experiments were carded out on a PD experiment platform. The results show that the combined sensor can distinguish and locate one or multiple PD sources effectively： the two kinds of locations have average relative errors of 2.1% and 5.1%, respectively. Virtually expanding an array with relatively few elements helps to design a miniaturized combined sensor, providing a foundation for practically applying array technology in power equipment.