全光纤电流互感器关键状态量及其监控方法  

Key State Parameters and Relevant Monitoring Methods of Fiber Optical Current Transformer

作　　者：胡蓓[1] 叶国雄[1] 肖浩 李建光 刘博阳 

机构地区：[1]中国电力科学研究院,武汉430074 [2]北京世维通科技发展有限公司,北京100084

出　　处：《高电压技术》2016年第12期4026-4032,共7页High Voltage Engineering

基　　金：国网公司科技项目(电子式互感器全工况试验平台及长期性能考核研究)~~

摘　　要：全光纤电流互感器（FOCT）在现场运行过程中会受到各种外在的因素（例如环境温度、振动、冲击、电磁干扰等）和内在因素（光电子器件性能老化、光路损耗增加等）的影响，这些因素将引起全光纤电流互感器内部状态量发生变化，从而降低了产品的准确性和可靠性。针对该问题，对FOCT的光源管芯温度、光源发射光功率、相位调制器半波电压、光纤传感环工作温度和光电探测器接收光功率5个状态进行了理论分析和试验测试，首次定量地给出了各状态参量对FOCT准确度的影响，同时提出了各状态量的监测和控制方法，并进行了试验验证。测试结果表明，对这些关键状态量进行监控的FOCT产品，在全温度范围（-40℃～70℃）内比差〈0．1％、相差〈3’。该研宄为FOCT产品的关键参数设计和性能优化提供了技术指导，为实现FOCT现场运行状态在线监测与提前预警提供了基本模型和数据支撑，有利于提高FOCT在长期运行中的稳定性和可靠性。Fiber optical current transformer （FOCT） can be influenced by a variety of external factors （such as ambient temperature, vibration, shock, electromagnetic interference, etc.） and internal factors （such as degradation of optoelec- tronic devices, increase of optical loss, etc.） in the field operation process, and these factors cause the change of internal key state parameters in FOCT, thus reduce the accuracy and reliability of the product. To solve this problem, we proposed five key state parameters of FOCT, namely, junction temperature of SLDs, transmitting optical power of SLD, half-wave voltage of phase modulator, working temperature of fiber sensing coil ,and the received optical power of photo detector. Analyzing the experimental results of these parameters, we quantitatively proposed the impact of the key state parameters on FOCT accuracy for the first time.Furthermore, we put forward the methods for monitoring and controlling each key state parameters respectively with experimental verification. The test results show that the ratio error and phase error of the FOCT product by state monitoring is lower than 0.1% and 3＇, respectively, over a temperature range of-40 ℃-70℃. The results provide a technical guidance for the key parameter design and performance optimization of FOCT products, supplys basic model and data support for the inline monitoring and early warning to FOCT operation state, which will be helpful to improving the stability and reliability of FOCT products in long-term operation.

关 键 词：全光纤电流互感器 关键状态量 准确度 在线监测 提前预警 可靠性 

分 类 号：TM452[电气工程—电器]