光纤电流互感器关键状态在线监测技术研究

发布时间：2019-04-01 11:15

【摘要】：光纤电流互感器(FOCT)在实际运行过程中会因外部环境变化或内部器件性能劣化导致系统误差增大或功能失效。而以上变化都是缓慢的过程,可以通过对FOCT内部的一些关键状态参量(如环境温度、SLD光源运行状态、相位调制器半波电压、探测器接收光功率等)进行监测来实现提前预警。本文提出了对FOCT关键状态参量进行在线监测的硬件电路和算法,开发了FOCT关键状态在线监测系统,并在中国电科院电子式互感器全工况长期性能考核平台上进行为期一年的挂网运行。通过对挂网运行数据进行分析,并结合理论计算和设计实验验证的方法,分析了各个关键状态参量对系统性能的影响,发现影响系统误差的主要因素是环境温度,影响系统可靠性的直接因素是探测器接收光功率。为提高FOCT的准确性和可靠性,必须对温度变化引起的误差进行必要的补偿,对光功率衰减给出及时的预警。该研究为改进FOCT设计提供了理论依据和数据支持,有利于进一步提高FOCT现场运行的可靠性和准确性。
[Abstract]:During the practical operation of fiber optic current transformer (FOCT), the system error will increase or the function will fail due to the change of the external environment or the deterioration of the performance of the internal devices. The above changes are slow, and some key state parameters (such as ambient temperature, operating state of SLD light source, half-wave voltage of phase modulator, detector receiving light power, etc.) of FOCT can be monitored to achieve early warning. In this paper, the hardware circuit and algorithm for on-line monitoring of key state parameters of FOCT are presented, and the on-line monitoring system of FOCT critical state is developed. And in the Chinese Academy of Electric Sciences electronic transformer performance assessment platform for a period of one year. Through the analysis of the running data of the hanging network and the method of theoretical calculation and design experiment verification, the influence of the key state parameters on the performance of the system is analyzed. It is found that the main factor affecting the system error is the ambient temperature. The direct factor affecting the reliability of the system is the light power received by the detector. In order to improve the accuracy and reliability of FOCT, it is necessary to compensate the errors caused by temperature change and to give a timely warning to the attenuation of optical power. This research provides theoretical basis and data support for the improvement of FOCT design, which is helpful to further improve the reliability and accuracy of FOCT field operation.
【学位授予单位】：华北电力大学(北京)
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM452

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