Distributed Flexible Strip-Type Soil Moisture Sensing and Detection System

2011 ◽  
Vol 383-390 ◽  
pp. 136-144
Author(s):  
Ge Shi ◽  
Qing Li
Keyword(s):  
Soil Moisture ◽  
Transmission Line ◽  
Transmission Lines ◽  
High Speed ◽  
Detection System ◽  
Pulse Signal ◽  
Long Distance ◽  
Parallel Transmission ◽  
Reflected Signal ◽  
Moisture Sensing

A distributed flexible strip-type soil moisture sensing and detection system based on the principle of parallel transmission line distribution parameter measurement is introduced. The changes of soil moisture in some regions will cause the changes of distribution impedance in the strip-type flexible strip-type parallel transmission line which buried in the soil, when a high-speed pulse signal transmit through the transmission line, and the changes of distribution impedance lead to a reflected signal of the pulse in time domain. The soil moisture around the transmission line can be measured by studying the reflected signal. The results of experiments shows, the distributed soil moisture measurement system is able to measure the soil moisture changes of any regions around the long-distance transmission lines. Through this transmission line sensor, it can realize the monitoring work of the soil moisture changes and gradient of changes on different layers or different regions, and the system is quite suitable for the early warning of geological disasters and agricultural scientific production applications.

Research on Frequency Electromagnetic Field of Parallel Transmission Line

2014 ◽  
Vol 986-987 ◽  
pp. 1992-1995
Author(s):  
Hong Ying Cao ◽  
Bo Tang ◽  
You Xian Peng ◽  
Yu Li ◽  
Bin Chen
Keyword(s):  
Magnetic Field ◽  
Electromagnetic Field ◽  
Transmission Line ◽  
Transmission Lines ◽  
The State ◽  
National Standards ◽  
Power Lines ◽  
Three Gorges ◽  
Parallel Transmission ◽  
Electric And Magnetic Field

At present the study mainly for frequency electromagnetic field which is based on a single transmission line meanwhile the value must be in line with the requirements of the workers in the country frequency electromagnetic field. However, for parallel transmission line the maximum of frequency electromagnetic field is still to meet the provisions of the state, therefore in this paper studied the parallel transmission lines. Taking the multiple parallel power lines of China Three Gorges University as an example, the values of electric and magnetic field are calculated and the electromagnetic field is measured based on National standards. Then, compare the measured value with theoretical value, verified the correctness of the superposition algorithm.

Based on the TLM Method 1000kV UHV Transmission Line Performance Analysis

2011 ◽  
Vol 383-390 ◽  
pp. 2917-2922
Author(s):  
Feng Xia Li ◽  
Yue Long Wang
Keyword(s):  
Performance Analysis ◽  
Transmission Line ◽  
Transmission Lines ◽  
Power Transmission ◽  
Transmission Power ◽  
Long Distance ◽  
Transmission Distance ◽  
Transmission Line Modeling ◽  
Tlm Method ◽  
Ac Transmission

The TLM model of 3 - phase pow er t ran sm ission line is developed. Appling the transmission line modeling (TLM) method to analysis 1000kV ultrahigh voltage( UHV) AC transmission line, the obtained results prove that it is economical and reasonable to transmit the natural power by power transmission, and the transmission lines is a long-distance transmission power ; but both the super power and the power transmission, the transmission power reduce with the increase of transmission distance.

scholarly journals Distribution of Voltage Induced by Magnetic Field of Parallel Transmission Line Along Dead and Grounded Lines

2015 ◽  
Vol 4 (4) ◽  
pp. 32-38 ◽  
Author(s):  
Токарский ◽  
A. Tokarskiy ◽  
Рубцова ◽  
Nina Rubtsova
Keyword(s):  
Magnetic Field ◽  
Transmission Line ◽  
Transmission Lines ◽  
Dead Zone ◽  
Induced Voltage ◽  
Calculation Methods ◽  
Voltage Distribution ◽  
Single Wire ◽  
Parallel Transmission ◽  
Accuracy Increase

With the view of calculation methods accuracy increase duringcalculations by Carson’s method, by simplified Carson’s method and by hequ method, we considered induced voltage parameters,currents and voltage distribution alonggrounded on the ends single-wire transmission lines created by magnetic field of parallel single-wire operating line. It is shown that hequ method, eliminating errors in the "dead zone" in calculation by Carson’s method, gives almost identical results outside the "dead zone", and small differences with the results of simplified Carson’s method.

scholarly journals Corona Loss Minimization on High Voltage Transmission Line Network using Bundled Conductors.

2020 ◽  
Vol 9 (3) ◽  
pp. 887-891
Keyword(s):  
Transmission Line ◽  
Transmission Lines ◽  
Power Transmission ◽  
Hessian Matrix ◽  
Electrical Power ◽  
Power Transmission Lines ◽  
Long Distance ◽  
Power Stations ◽  
Line Network ◽  
Corona Losses

Electrical power generated and transmitted at a long distance away from the power stations is usually affected by inherent transmission line losses. The Ohmic and Corona losses which are predominantly common in power transmission lines are considered in this paper. These two losses are mathematically modeled with and without embedded bundled conductors. The resultant model which is a non-linear multivariable unconstrained optimized equation is minimized using the Hessian matrix determinant method for stability test purposes. The results obtained show that corona losses are minimized with embedded bundled conductors at a very low current value with large spacing distance between the bundled conductors. The decrease in the corona loss which is a consequence of spacing adjustment of the 2, 3, and 4 strands of bundled conductors was plotted using MATLAB 7.14. The plots obtained are in conformity with the inverse relation between corona loss and conductor spacing.

scholarly journals LoRa-Based Smart IoT Application for Smart City: An Example of Human Posture Detection

2020 ◽  
Vol 2020 ◽  
pp. 1-15
Author(s):  
Jinkun Han ◽  
Wei Song ◽  
Amanda Gozho ◽  
Yunsick Sung ◽  
Sumi Ji ◽  
...  
Keyword(s):  
Smart City ◽  
High Speed ◽  
Detection System ◽  
Low Cost ◽  
Long Distance ◽  
Sliding Windows ◽  
Human Posture ◽  
Artificial Intelligence Technology ◽  
Posture Recognition

Scientists have explored the human body for hundreds of years, and yet more relationships between the behaviors and health are still to be discovered. With the development of data mining, artificial intelligence technology, and human posture detection, it is much more possible to figure out how behaviors and movements influence people’s health and life and how to adjust the relationship between work and rest, which is needed urgently for modern people against this high-speed lifestyle. Using smart technology and daily behaviors to supervise or predict people’s health is a key part of a smart city. In a smart city, these applications involve large groups and high-frequency use, so the system must have low energy consumption, a portable system, and a low cost for long-term detection. To meet these requirements, this paper proposes a posture recognition method based on multisensor and using LoRa technology to build a long-term posture detection system. LoRa WAN technology has the advantages of low cost and long transmission distances. Combining the LoRa transmitting module and sensors, this paper designs wearable clothing to make people comfortable in any given posture. Aiming at LoRa’s low transmitting frequency and small size of data transmission, this paper proposes a multiprocessing method, including data denoising, data enlarging based on sliding windows, feature extraction, and feature selection using Random Forest, to make 4 values retain the most information about 125 data from 9 axes of sensors. The result shows an accuracy of 99.38% of extracted features and 95.06% of selected features with the training of 3239 groups of datasets. To verify the performance of the proposed algorithm, three testers created 500 groups of datasets and the results showed good performance. Hence, due to the energy sustainability of LoRa and the accuracy of recognition, this proposed posture recognition using multisensor and LoRa can work well when facing long-term detection and LoRa fits smart city well when facing long-distance transmission.

Designing of Belt Speed Detection System Based on PLC High-Speed Counter

2013 ◽  
Vol 655-657 ◽  
pp. 1431-1434
Author(s):  
Xiao Shen ◽  
Zhou Yu Fu ◽  
Zhao Yang Sun ◽  
Pei Pei Su
Keyword(s):  
High Speed ◽  
Detection System ◽  
Pulse Signal ◽  
Belt Conveyor ◽  
Belt Speed ◽  
Speed Sensor ◽  
Text Display

According to slipping between the driving drum and the belt in motion of the belt conveyor, this article uses the intelligent speed sensor to transfer pulse signal into PLC high-speed counter, then realizes the relevant control through program processing and real-timely shows the value of the belt speed by text display. It completes the detection and display of the belt speed by real-timely, realizes the integration among the belt speed monitor and other control parts, reaches the purpose of slipping protection.

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