Design of self-powered lightning current measurement system

The current model of the lightning process is established and simulated in this article, and aiming at the disadvantage that the hardware filtering de-noising method adopted in the general lightning measurement system can not effectively separate signals and noises in same one frequency channel, this article uses the wavelet transform to replace the usual hardware filtering method in the lightning measurement system in order to overcome the disadvantage, and simulate this method. The result shows that this method is feasible and effective, with certain theoretical and practical values.

Download Full-text

Optically Powered Lightning Current Measurement System for High-Tower Observation

IEEE Access ◽

10.1109/access.2018.2799299 ◽

2018 ◽

Vol 6 ◽

pp. 17022-17028 ◽

Cited By ~ 2

Author(s):

Bo Yang ◽

Ya-Peng Fu ◽

Yan-Xin Li ◽

Mei-Li Yao ◽

Li-Hua Shi

Keyword(s):

Measurement System ◽

Current Measurement ◽

Lightning Current

Download Full-text

Time-Multiplexed Self-Powered Wireless Current Sensor for Power Transmission Lines

Energies ◽

10.3390/en14061561 ◽

2021 ◽

Vol 14 (6) ◽

pp. 1561

Author(s):

Hao Chen ◽

Zhongnan Qian ◽

Chengyin Liu ◽

Jiande Wu ◽

Wuhua Li ◽

...

Keyword(s):

Energy Harvesting ◽

Transmission Line ◽

Transmission Lines ◽

Power Transmission ◽

Current Measurement ◽

Current Sensor ◽

Power Transmission Line ◽

Power Transmission Lines ◽

Current Sensing ◽

Self Powered

Current measurement is a key part of the monitoring system for power transmission lines. Compared with the conventional current sensor, the distributed, self-powered and contactless current sensor has great advantages of safety and reliability. By integrating the current sensing function and the energy harvesting function of current transformer (CT), a time-multiplexed self-powered wireless sensor that can measure the power transmission line current is presented in this paper. Two operating modes of CT, including current sensing mode and energy harvesting mode, are analyzed in detail. Through the design of mode-switching circuit, harvesting circuit and measurement circuit are isolated using only one CT secondary coil, which eliminates the interference between energy harvesting and current measurement. Thus, the accurate measurement in the current sensing mode and the maximum energy collection in the energy harvesting mode are both realized, all of which simplify the online power transmission line monitoring. The designed time-multiplexed working mode allows the sensor to work at a lower transmission line current, at the expense of a lower working frequency. Finally, the proposed sensor is verified by experiments.

Download Full-text

A modified self-powered wireless temperature measurement system for high voltage switchgear

2018 13th IEEE Conference on Industrial Electronics and Applications (ICIEA) ◽

10.1109/iciea.2018.8397933 ◽

2018 ◽

Cited By ~ 1

Author(s):

Xiangkun Li ◽

Ning Gao ◽

Weimin Wu

Keyword(s):

Temperature Measurement ◽

High Voltage ◽

Measurement System ◽

Self Powered ◽

Temperature Measurement System

Download Full-text

Analysis of Eddy-Current Measurement System for Residual Stress Assessment in Stainless Steel Grade 304

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.659.623 ◽

2015 ◽

Vol 659 ◽

pp. 623-627 ◽

Cited By ~ 1

Author(s):

Cherdpong Jomdecha ◽

Isaratat Phung-On

Keyword(s):

Residual Stress ◽

Stainless Steel ◽

Eddy Current ◽

Measurement System ◽

System Analysis ◽

Stress Measurement ◽

Steel Grade ◽

Current Measurement ◽

Residual Stress Measurement ◽

Stress Assessment

The objective of this paper is an analysis of statistical discreteness and measurement capability of an eddy-current measurement system for residual stress assessment in stainless steel Grade 304 (SS304). Cylindrical specimens with 50 mm in diameter and 12 mm thickness were prepared to generate residual stress by Resistance Spot Welding at which the welding currents were set at 12, 14, and 16 kA. The eddy-current measurement system was including a probe with frequency range of 0.1 to 3 MHz and an eddy current flaw detector. They were performed by contacting the probe on the specimen. The measurements were performed particularly in the vicinity of heat affected zone (HAZ). In order to determine the results of the residual stress measurement, the calibration curves between static tensile stress and eddy current impedance at various frequencies were accomplished. The Measurement System Analysis (MSA) was utilized to evaluate the changed eddy-current probe impedance from residual stress. The results showed that using eddy current technique at 1 MHz for residual stress measurement was the most efficient. It can be achieved the Gauge Repeatability & Reproducibility %GR&R at 16.61479 and Number of Distinct Categories (NDC) at 8. As applied on actual butt welded joint, it could yield the uncertainty of ± 58 MPa at 95 % (UISO).

Download Full-text