基于变频信号法的一种对地电容电流检测系统

发布时间：2018-12-30 11:13

【摘要】：现有的基于变频信号法的对地电容电流检测系统多采用PWM逆变的方式作为扫频信号源,在应用中受到较多制约。对对地电容电流检测系统进行重新设计,检测系统的测量单元采用双单片机模式,信号源部分使用单片机控制DAC芯片作为数控信号源,经模拟实验验证在该应用中其性能优于传统的PWM逆变方式扫频信号源。相位测量部分由C8051F20片上系统兼顾相位检测与通信功能,上位机软件基于C/S构架搭建。该检测系统测量一次电容电流的时间不超过10 s,经现场实验验证了样机的测量误差在±2%以内,可直接应用于中压配电网的预调式消弧线圈,进一步设计后可应用于随调试消弧线圈。
[Abstract]:The current earth capacitive current detection system based on frequency conversion signal method mostly uses PWM inverter as sweep signal source, which is restricted in application. The earth capacitance current detection system is redesigned. The measuring unit of the detection system adopts double single chip microcomputer mode, and the signal source part uses DAC chip controlled by single chip computer as the numerical control signal source. The simulation results show that the performance of this method is better than that of the traditional PWM inverter signal source. The phase measurement part is composed of the system on C8051F20 chip and the communication function. The PC software is based on the C / S architecture. The measuring system can measure the primary capacitance current for less than 10 s. The measurement error of the prototype is less than 卤2%, which can be directly applied to the pre-adjusted arc-suppression coil of the medium voltage distribution network. The further design can be applied to the arc suppression coil with debugging.
【作者单位】：北京交通大学电气工程学院;
【分类号】：TM933.1

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