scholarly journals Proposal of detection method of poor contacting on low voltage switch circuit by ultrasonic wave and diode commutation circuit

2001 ◽  
Vol 121 (3) ◽  
pp. 413-414
Author(s):  
Hideki Hara ◽  
Koichi Nakamura
Keyword(s):  
Ultrasonic Wave ◽  
Detection Method ◽  
Low Voltage ◽  
Switch Circuit ◽  
Commutation Circuit

New Detection Method for an Insulation Level Monitoring Device Used in Low-Voltage Distribution Lines

2016 ◽  
Vol 136 (11) ◽  
pp. 878-883 ◽  
Author(s):  
Kazunori Nishimura ◽  
Yusaku Marui ◽  
Satonori Nishimura ◽  
Wataru Sunayama
Keyword(s):  
Detection Method ◽  
Low Voltage ◽  
Monitoring Device ◽  
Voltage Distribution ◽  
Distribution Lines ◽  
Level Monitoring

scholarly journals Low Frequency Injection as a Method of Low-Level DC Microgrid Communication

Energies ◽  
2020 ◽  
Vol 13 (10) ◽  
pp. 2452
Author(s):  
Matthew Davidson ◽  
Andrea Benigni
Keyword(s):  
Detection Method ◽  
Low Voltage ◽  
Low Frequency ◽  
Communication Structure ◽  
Dc Microgrid ◽  
Low Level ◽  
Communication Structures ◽  
Communication Method ◽  
Communication Scheme ◽  
Frequency Components

This paper provides a simple low-level unidirectional global communication method for DC microgrids, and requires no hardware modifications to the microgrid and interfacing power electronic converters. The underlying premise to this communication method is injecting low-frequency low-voltage sinusoidal components into the DC microgrid power lines. This method deviates from the common bit-level communication scheme by relating parameters and commands with certain frequency components. Communication structures are included as a basis for communication protocols, and a detection method is proposed for detecting the injected frequencies. The injection method, communication structure, and detection method are implemented on a live-scale DC microgrid.

scholarly journals An improved gas kick detection method based on continuous Doppler ultrasonic wave in deep water drilling

2017 ◽  
Vol 9 (8) ◽  
pp. 168781401771542
Author(s):  
Quan Zhou ◽  
Hui Zhao ◽  
Shengnan Li ◽  
Yufa He ◽  
Huijie Zhang
Keyword(s):  
Ultrasonic Wave ◽  
Deep Water ◽  
Detection Method ◽  
Gas Kick ◽  
Continuous Doppler

Analysis of SMPS in Clinical Medical Equipment

2014 ◽  
Vol 484-485 ◽  
pp. 671-673
Author(s):  
Jun Ying Zhou ◽  
Nan Zhang ◽  
Su Fang Kong ◽  
Fu Hua Zhang ◽  
Xiu Xian Guo
Keyword(s):  
Power Supply ◽  
Medical Equipment ◽  
High Efficiency ◽  
Low Voltage ◽  
Voltage Level ◽  
Switch Mode Power Supply ◽  
Voltage Range ◽  
Dc Voltage ◽  
Off Time ◽  
Switch Circuit

There exists low voltage in circuit of domestic and imported medical equipment and it is what we call power supply. In the past, equipment mainly uses transformer to step down the voltage of power supply. With the progress of science and technology, the technique is gradually replaced by SMPW (switch mode power supply) which is extensively applied to various types of medical equipment due to the high efficiency and wide voltage range. The mains power supply is rectified and filtered into a DC high voltage and then use the switch circuit and energy storage elements to convert them into a variety of required DC voltage output, output DC voltage level can be adjusted by changing the off time (namely Mark-Space Ratio) of switching circuit.

scholarly journals Detection Technology of Foamed Mixture Lightweight Soil Embankment Based on Ultrasonic Wave Transmission Method

2019 ◽  
Vol 2019 ◽  
pp. 1-15 ◽  
Author(s):  
Shikun Pu ◽  
Baoning Hong ◽  
Xin Liu ◽  
Fenqiang Xu ◽  
Hao Shan
Keyword(s):  
Ultrasonic Wave ◽  
Detection Method ◽  
Wave Transmission ◽  
Simulation Approach ◽  
Transmission Method ◽  
Detection Technology ◽  
Ultrasonic Parameters ◽  
Test Distance ◽  
Quality Diagnosis ◽  
Curing Age

This study attempted to establish a process that uses the ultrasonic wave transmission method to correlate the ultrasonic parameters with the material properties of Foamed Mixture Lightweight Soil (FMLS). The results were then applied for the defect detection of the FMLS embankment. First, the ultrasonic wave velocity (UPV) and amplitude (UPA) of FMLS with different mix proportions were collected continuously from 3rd day to 45th day in the curing age. The relationships between UPV versus FMLS elastic modulus, unconfined compressive strength, and density were calibrated. The variations in the ultrasonic parameters owing to the test distance and crack width were recorded. Then, the laboratory tests were reproduced through numerical simulation approach. Finally, the reliability and accuracy of the proposed detection method for FMLS were proved and validated through on-site tests. The proposed methodology, which is simple, stable, and reliable, was found to be suitable for the quality diagnosis of FMLS embankments after construction and during operation.

scholarly journals AN OUTLIER DETECTION METHOD OF LOW-VOLTAGE USERS BASED ON WEEKLY ELECTRICITY CONSUMPTION

2019 ◽  
Vol 631 ◽  
pp. 042004
Author(s):  
Tang Xiao-feng ◽  
Huang Rui ◽  
Chen Qi ◽  
Peng Zhao-yi ◽  
Wang Hao ◽  
...  
Keyword(s):  
Outlier Detection ◽  
Detection Method ◽  
Low Voltage ◽  
Electricity Consumption
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