The basic principle of broadband monopole antenna is discussed. A UHF sensor used for the spatial location of the partial discharge in substation is designed. With an elliptic monopole patch, the sensor can effectively meet the omni-directional detection requirements because of its advantages of omni-direction, broadband, high sensitivity, low standing wave ratio and stable group delay. The UHF sensor array consisting of multiple sensors is able to undertake spatial location of partial discharge. The spatial detection and location performance of the sensor are verified at the partial discharge experimental platform in a lab, and the sensor array consisting of such sensors is used for continuous monitoring of partial discharge in the substation field. Laboratory experiment and field application results show that the sensor is able to satisfy requirements in spatial location of partial discharge in substation.%基于宽带单极天线理论，设计了一种可用于变电站局部放电空间定位的特高频传感器。该传感器采用椭圆单极贴片的结构，具有全向、宽频带、高灵敏度、驻波比低及群时延稳定等特点，能有效满足变电站放电源全向检测的要求，多个传感器可组成特高频传感器阵列，对放电源进行空间定位。实验室搭建的局放实验平台对该传感器的空间检测及定位性能进行了验证，并成功将由该传感器组建的传感器阵列用于了变电站现场放电在线监测。实验室实验及现场应用结果表明，该传感器能够满足变电站放电源空间定位的要求。
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