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20. High-Precision PMU Testing Device Based on Synchronous Clock Source

Author

Pei Maolin, Fan Yajun, Weizhe Zhao, Liangliang Chen, Yang Aichao, Xiong Ru, Xiong Zhiling, Hu Haimei, and Hongchun Cao

Subjects
business.industry, Computer science, System of measurement, Testing equipment, Phase (waves), Global Positioning System, Vibrator (electronic), Electronic engineering, Low frequency, business, Phasor measurement unit, Power (physics)
Abstract

As the lack of on-spot testing equipment for synchronous Phasor Measurement Unit (PMU), the on-spot testing work of PMU has not been carried out effectively. So the function of Wide area measurement system (W AMS)based on PMU was restricted greatly. In the on-spot PMU testing, the major issues are the implement of the power angle measurement and sufficient dynamic-precision. To solve these problems, we developed a high-precision PMU testing device based on the synchronous clock source in this paper. The proposed device can output amplitude, phase, frequency and low frequency vibrator of signals, which also synchronize with the second pulse of Global Positioning System (GPS). We further constructed the synchronous simulated system by the PMU testing device we developed, which is used for implementing the test on the spot. It is effective not only for static precision, but also for dynamic precision and functions of PMU.

Published
2018

41. Sensitive current sensor based on Fe73.5Cu1Nb3Si13.5B9/Pb(Zr,Ti)O3 composite with a tunable magnetic flux concentrator.

Author

Ou, Zhengyu, Zhou, Hai, Yang, Aichao, Lu, Caijiang, Zhu, Renren, and Gao, Hongli

Subjects
LEAD titanate, LEAD oxides, DETECTORS, MAGNETIC flux, MAGNETIC fields, MAGNETORESISTANCE
Abstract

This paper presents a sensitive current sensor based on magnetoelectric composite Fe73.5Cu1Nb3Si13.5B9/Pb(Zr,Ti)O3 with a tunable magnetic concentrator. The concentrator with a movable magnetic plate can enable the DC bias magnetic field (Hdc) to become tunable to meet the needed optimal Hdc of Fe73.5Cu1Nb3Si13.5B9/Pb(Zr,Ti)O3 and to reduce the magnetoresistance of the magnetic loop. Furthermore, the sensor's resonant frequency is adjustable to improve the sensitivity for measuring current at different frequencies. From experiments, the proposed sensor has a sensitivity of ∼246.71 mV/A and a linearity of ∼0.98% at 50 Hz current. The results indicate that the proposed current sensor is ideally suited for current-monitoring. [ABSTRACT FROM AUTHOR]

Published
2019
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