摘要
电流传感器的响应时间导致相位测量有误差,从而直接对功率测量精度产生较大影响。针对该问题,本文根据电流传感器的测量原理建立数学模型,研制了一种可以同时对多个电流传感器实现自动相位校准的相位校准系统。该相位校准系统通过采集电流传感器的被测信号和输出信号,计算得到电流传感器的传递特性函数。具有功率测量功能的仪器在使用已校准的电流传感器测量时,读取该电流传感器的传递特性参数,根据已校准的电流传感器的相频特性获取不同频率的被测信号的相位延迟,并对该误差进行相位补偿从而达到高精度测量的目的。实际应用证明,相位校准后的电流传感器的相位测量误差小于0.2°,能满足高精度功率测量的需求,高效并具有很高的稳定性。
The phase measurement error occurs because of the responsetime of the current sensor, largely and directly affecting the accuracy for the power measurement. To solve this problem, a mathematical model is established in this thesis to develop a phase calibration system by which the multiple current sensors can be calibrated automatically and simultaneously. With this phase calibration system, the signal of the current sensor is captured and used for calculating the transfer function. During measurement, the instrument with power measurement function will acquire the phase-delay signal under test at different frequency based on the phase frequency characteristic of the calibrated current sensor, and compensate the phase error to achieve accurate measurement. In practical use, the phase error for the sensor measurement has decreased to less than 0.2° , meeting the requirement of high precision powermeasurement, stably and efficiently.
作者
李楚元
Li Chuyuan(Inno Instrument（China）INC.,Shanghai 20023)
出处
《电气技术》
2018年第10期44-49,共6页
Electrical Engineering
关键词
电流传感器
相位校准
传递函数
相频特性
测量精度
current sensor
phase calibration
transfer function
phase frequency characteristic
measurement accuracy
