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特高频(ultra-high frequency，UHF)传感器的时域输出信号对局部放电宽带检测系统的检测和定位结果具有显著影响，因此评估传感器检测性能时，若能从其时域输出特性出发，将更贴近于宽带检测系统的工程需求。现有的有效高度表征体系不适用于具有非平坦群时延的特高频传感器，在描述传感器时域输出特性时具有局限性。提出了一种基于时域参数的特高频传感器的性能表征方法，通过构造解析脉冲响应函数，从中提取包络峰值、包络宽度和振荡时间三种时域参数，用于描述传感器在局部放电脉冲信号下时域输出波形的峰峰值、上升时间和振荡。设计了有效高度幅频特性与相频特性的测试系统并给出时域参数的测试方法。通过比较两种传感器的时域参数测试结果和实际检测结果对该表征方法进行了检验。研究结果表明：该表征方法能有效地反映UHF传感器的时域输出特性，弥补了现有方法的不足。“,”For wide-band partial discharge (PD) detection systems, the time domain output signals of an ultra-high frequency (UHF) sensor significantly affect the results of PD detection and location. Therefore it would be more practical for wide-band PD detection systems if the performance of a UHF sensor is evaluated in terms of its time domain output characteristics. The effective height characterization system currently used has its limitation when the sensor has a non-flat group delay. A performance characterization method of UHF sensors based on time domain parameters is therefore proposed. Three time domain parameters extracted from the analytic impulse response, i.e. the peak value of the envelope, the envelope width and the ringing duration, are applied to describe the peak-peak value, the rise time and the oscillation of the output signal of a UHF sensor detecting PD. A measurement system of the sensor effective height, as well as the method to obtain time domain parameters, is presented. The test results of two sensors is compared with their performance in PD detection to examine the feasibility of the characterization method, which demonstrates that the proposed method can effective characterize the time domain output signals of UHF sensors and thus make up for the shortage of existing characterization methods.