一种用于高压直流输电系统的有源式光纤直流电流传感器.pdfVIP

29 7 Vol29 No7 2008 7 Chinese JournalofScientific Instrument Jul. 2008 * 张 艳, 李红斌, 张 曦, 张明明 ( 430074) : , :; ; , MSP430F149 TMS320F2812 , 300~ 3 000A, 0. 2% , 46mW, 460 s, 10% : ; ; ; ; : TM452 : A : 470. 4017 Active optical fiber direct current sensor forHVDC system ZhangYan, LiHongbin, ZhangX,i ZhangM ingm ing ( College of E lectrical and E lectronic Eng ineering H uazhong University of S cience and Technology, Wuhan 4300 74, China Abstract: A new subject of high direct currentmeasurem ent in high voltage transm ission line appears in vigorous process ofHV C in china. Combining conventional sensing head with optical fiber communication technique is the developing trend of direct currentm easurement in high voltage environment. First in this paper, the structure and op erating principle of active optical fiber direct current sensor are described, then the prototype development process is described in detai.l A m anganin shuntw ith stable temperature performance is selected as the sensing head, and the high voltage side circuit is powered by opticalpowered technology. To increase the lifetmi e and reliability of the largepower light source, highvoltage side circuit is designed based on ultralowpower m icrocontroller MSP430F149 and the corresponding demodulation circuit is designed based on SP chipTMS320F128. Test results show that the direct currentmeasurement accuracy is better than 0. 2% from 300A to 3000A and the high voltage side power consumption is less than 46mW. The rise tmi e of step response is about460s andmaxmi um overshoot is not beyond 10% . Key words: direct currentmeasuremen;t H ighVoltage irect Current (HV C) transm ission; C shunt; low powe