One-dimensional signals characterizing the insulation state of cable terminals

The high-frequency current transducer is capable of capturing HFCT signals in the 3 MHz to 30 MHz bandwidth with an integrating resistor value of 50 Ω. The high-frequency current transducers have a sampling ratio of 8 mV:1 mA and a detection sensitivity of up to 0.5 pC. The phase synchronizer is employed to ensure signal phase synchronization between the detection equipment and the vehicle cable terminals to accurately characterize the HFCT signal. It is essential to align the shielding environment and the surrounding electrical equipment to perform the experiment in a halo-free environment where the background noise of the test system is less than 3 mV. The experiment is performed by snapping the HFCT sensor to the cable ground wire and setting the acquisition frequency to 100 MHz.Sample the original data 10,000 times using peak hold sampling.高频电流传感器（high-frequency current transducer）可在3 MHz至30 MHz的带宽内采集HFCT（High Frequency Current Transformer，高频电流互感器）信号，其积分电阻值为50 Ω。该类传感器的采样倍率为8 mV:1 mA，最高检测灵敏度可达0.5 pC。相位同步器用于确保检测设备与车载电缆端子间的信号相位同步，从而精准表征HFCT信号。为在测试系统背景噪声低于3 mV的无电晕环境中开展实验，需对屏蔽环境及周边电气设备进行调校。实验操作时，将HFCT传感器卡扣安装至电缆接地线，将采集频率设置为100 MHz，并采用峰值保持采样方式对原始数据进行10000次采样。