【摘要】 局部放电（PD）在线监测装置对设备状态综合感知与智能诊断起到重要作用。随着运行年限的逐渐增加，受到工作环境、生产工艺等多因素影响，传感器本体性能遭受挑战，需要开展校验工作。从特高频传感器工作特性、安装位置与信号传输衰减特性3个方面对影响特高频局部放电（ultrahigh frequency partial discharge,UHF-PD）在线监测系统现场校核的因素开展分析，在传统CIGRE校验方法基础上进一步提出交叉比对式校验方法，通过不同相间的横向比对、互为输入/输出情况下的镜像比对等方式有效降低绝对值检测对传感器校验准确性的影响，提升了整体校验效率。最终，采用所提出的交叉比对式校验方法对某变电站高压500kV侧GISUHF-PD在线监测装置开展现场校核，成功发现传感器灵敏度下降、传感器部署位置不合理以及采集板故障3种典型问题，验证了该方法的有效性和可行性。更多还原

【Abstract】 Partial discharge(PD) on-line monitoring device plays an important role in comprehensive perception and intelligent diagnosis of equipment conditions. Affected by the operational environment, manufacturing technology and other factors, the on-line PD sensors are deteriorated in performance with the increase of their service time, the sensors’ calibration is thus imperative. An optimized field calibration method is proposed for the internal ultrahigh frequency partial discharge(UHF-PD) sensors of on-line PD monitoring system. Firstly, the influencing factors on the field calibration of the UHF-PD on-line monitoring system are analyzed from three aspects including sensors’ working features, installation location and signal transmission attenuation properties. Then, a novel cross-check method is proposed based on the traditional GIGRE method. Through horizontal comparison between different phases and mirror comparison between input/output signals, the effects of absolute-value check on the accuracy of sensor’s calibration is significantly decreased, thus improving the overall calibration efficiency. Finally, the proposed method was applied in a500 kV substation for field calibration of the UHF-PD on-line monitoring system, and identified three typical defects, including the degraded sensors’ sensitivity, unreasonable sensors arrangement and faulted acquisition board. The results verified the effectiveness and feasibility of the proposed method.更多还原