Research on Electromagnetic Interference of 5G Base Station Antenna in Shared Towers to Power Online Monitoring Equipment

2021 ◽  
Author(s):  
Zeyang Tang ◽  
Su Lv ◽  
Wei Rao ◽  
Fei Yu ◽  
Yibo Cui ◽  
...  
Keyword(s):  
Electromagnetic Interference ◽  
Online Monitoring ◽  
Base Station ◽  
Monitoring Equipment

scholarly journals Construction of Online Monitoring System for Track Safety and its Vibration and Noise

New Metro ◽  
2020 ◽  
Vol 1 (1) ◽  
pp. 28-33
Author(s):  
Snan Taotao ◽  
Dong Guoxian
Keyword(s):  
Real Time ◽  
Monitoring System ◽  
Online Monitoring ◽  
Health And Safety ◽  
Rail Transit ◽  
Time Data ◽  
Monitoring Equipment ◽  
Status Monitoring ◽  
On Line ◽  
Online Monitoring System

In accordance with the requirements of intelligent and scientific maintenance and repair for rail transit, the on-line monitoring and intelligent assessment technologies for infrastructure safety as well as vibration and noise indexes are studied. In connection with the line status of the Shanghai rail transit network, typical line sections are selected to lay out the online status monitoring equipment so as to track health and safety indexes of rails and real-time noise and vibration levels. By means of online real-time data collection and synchronous analysis technology, the Shanghai rail transit online monitoring system for track safety status and its vibration and noise takes shape, thereby achieving real-time monitoring for on-site vibration and noise as well as safety status, and providing assistant decision-making reports in connection with relevant index systems and in accordance with relevant time periods.

scholarly journals Study on internet of things architecture of substation online monitoring equipment

2021 ◽  
Vol 336 ◽  
pp. 05024
Author(s):  
Hejun Zhang ◽  
Dong Ge ◽  
Ning Yang ◽  
Pengfei Jia ◽  
Lihua Li ◽  
...  
Keyword(s):  
Internet Of Things ◽  
Monitoring System ◽  
Online Monitoring ◽  
The Internet ◽  
Monitoring Equipment ◽  
Accurate Evaluation ◽  
Accurate Perception ◽  
On Line ◽  
Substation Equipment ◽  
The Internet Of Things

This paper introduces the structure of the existing on-line monitoring system, and analyzes the problems of poor compatibility and reliability of IED in different manufacturers. Then it gives two ways to transform the on-line monitoring system of substation equipment to the Internet of things, which is to retain IED and to remove IED. On this basis, this paper introduces the application scenarios of the on-line monitoring system of substation equipment connected to the Internet of things, including accurate perception of equipment status, accurate evaluation of equipment status and intelligent research and judgment of equipment status.

Development of multi-parameter online monitoring equipment for EHV transformer bushing

2020 ◽  
Vol 14 (1) ◽  
pp. 98-103 ◽  
Author(s):  
Lu Zhang ◽  
Lei Sun ◽  
Jingfeng Wu ◽  
Yanhua Han ◽  
Sen Wang ◽  
...  
Keyword(s):  
Online Monitoring ◽  
Monitoring Equipment

Feasibility of Wireless Sensors for Health Monitoring in Large Induction Motors

2009 ◽  
Author(s):  
Rafael Garcilazo ◽  
Xin Xue ◽  
V. Sundararajan
Keyword(s):  
Electromagnetic Interference ◽  
Wireless Sensors ◽  
Spatial Location ◽  
Base Station ◽  
Wireless Sensor ◽  
Rotating Shaft ◽  
Packet Delivery ◽  
Delivery Performance ◽  
Wide Range ◽  
Ac Induction Motor

Wired sensor systems are currently used to monitor the performance and health of electric motors. Since the sensors need to be wired, these systems can only use few sensor modalities which are generally insufficient to detect the wide range of faults in motors. Wireless sensors, on the other hand, allow access to sensors mounted in accessible locations and on rotating parts. They are easy to install and maintain. However, the reliability of the transmission due to electromagnetic interference and the fidelity of the data due to high winding temperatures inside the motor need to be examined. This paper studies the feasibility of wireless sensors inside a 200hp AC induction motor. Two wireless sensors are attached inside the motor — one on the stator frame and one on the rotating shaft. A wired sensor is attached on the outside of the stator frame to study the fidelity of data from the wireless sensor. The packet delivery performance as a function of spatial location in terms of direction and distance with respect to the base station and the fidelity of data received by the base station are studied. The results show that an average of 97% and 87.9% of the data from the wireless sensor attached on the stator frame and shaft respectively is received at the base station, thus showing that wireless sensors can be reliably used inside the motor.

A low-cost wireless sensor network for citizen science water quality monitoring

2021 ◽  
Author(s):  
Elena von Benzon ◽  
Elizabeth Bagshaw ◽  
Michael Prior-Jones ◽  
Isaac Sobey ◽  
Rupert Perkins ◽  
...  
Keyword(s):  
Water Quality ◽  
Wireless Sensor Network ◽  
Real Time ◽  
Sensor Network ◽  
Low Cost ◽  
Water Quality Monitoring ◽  
Base Station ◽  
Quality Monitoring ◽  
Wireless Sensor ◽  
Monitoring Equipment

<p>We present the first trial of an accurate, low-cost wireless sensor, the ‘Hydrobean’, and base station designed for use by citizen scientists in catchment water quality monitoring. This novel wireless sensor network addresses key concerns identified with current volunteer monitoring programmes, including temporal discontinuity and insufficient data quality. Hydrobean continuously measures electrical conductivity, temperature and pressure and wirelessly transmits these data to an online portal for observation and download by users. These parameters can be used to assess catchment water quality status, with excursions from baseline conditions detected in real time at high temporal resolution. Citizen scientists have an increasingly important role to play in enhancing our scientific understanding of catchment water quality, but their contribution has so far been limited by barriers to access suitable monitoring equipment. Traditional grab sampling techniques result in key contamination incidents being missed and trend analysis limited as samples are analysed discretely, typically on a weekly or monthly basis. Additionally, the quality of data obtained from basic chemical test kits commonly used by citizen scientists does not meet the requirements of many data users. This research explores the role of low-cost wireless sensor networks in advancing the potential of citizen scientists in monitoring catchment water quality. Monitoring equipment available to citizen scientists generally needs to be low cost, so is unlikely to rival professional standard monitoring techniques in the foreseeable future. However, reliable, low-cost sensors which enable continuous, real-time monitoring do now exist for a limited range of water quality parameters and have been used in the development of the wireless sensor network presented here. Critically, Hydrobean and its base station are low cost, low maintenance, portable and robust in order to meet the requirements of community monitoring programmes. Ultimately, a model will be integrated into the real-time analysis of data collected by the wireless sensor network to predict when and where contamination incidents are expected to be affecting catchment water quality. We report initial field results of the Hydrobean wireless sensor network and will discuss ways in which the basic design can be improved in future versions. </p>

scholarly journals Original Findings Confirmed in Replication Study: Provocation with 2.4 GHz Cordless Phone affects the Autonomic Nervous System (ANS) as measured by Heart Rate Variability (HRV)

2021 ◽  
Vol 9 (11) ◽  
Author(s):  
Magda Havas ◽  
Jeffrey Marrongelle
Keyword(s):  
Heart Rate ◽  
Heart Rate Variability ◽  
Electromagnetic Radiation ◽  
Electromagnetic Interference ◽  
False Negative ◽  
Base Station ◽  
Severe Reaction ◽  
Delayed Response ◽  
Double Blind ◽  
Cordless Phone

This is a double-blind, placebo-controlled replication of a study that we previously conducted in Colorado with 25 subjects designed to test the effect of radio frequency radiation (RFR) generated by the base station of a cordless phone on heart rate variability (HRV). In this study, we analyzed the response of 69 subjects between the ages of 26 and 80 in both Canada and the USA. Subjects were exposed to radiation for 3-min intervals generated by a 2.4-GHz cordless phone base station (3–8 microW/cm2). Prior to provocation we conducted an orthostatic test to assess the state of adrenal exhaustion, which interferes with a person’s ability to mount a response to a stressor. A few participants had a severe reaction to the RFR with an increase in heart rate and altered HRV indicative of an alarm response to stress. Based on the HRV analyses of the 69 subjects, 7% were classified as being “moderately to very sensitive”, 29% were “little to moderately sensitive”, 30% were “not to a little sensitive” and 6% were “unknown”. These results are not psychosomatic and are not due to electromagnetic interference. Twenty-five percent of the subjects’ self-proclaimed sensitivity corresponded to that based on the HRV analysis, while 32% overestimated their sensitivity and 42% did not know whether or not they were electrically sensitive. Of the 39 participants who claimed to experience some electrical hypersensitivity, 36% claimed they also reacted to a cordless phone and experienced heart symptoms and, of these, 64% were classified as having some degree of electrohypersensitivity (EHS) based on their HRV response. Novel findings include documentation of a delayed response to radiation. This protocol underestimates the reaction to electromagnetic radiation and may provide a false negative for those with a delayed reaction and/or with adrenal exhaustion. Orthostatic HRV testing combined with provocation testing may provide a useful diagnostic tool for some sufferers of EHS when they are exposed to electromagnetic radiation. It can be used to confirm EHS but not to reject EHS as a diagnosis since not everyone with EHS has an ANS reaction to electromagnetic radiation.

The Application of Wireless Sensor Networks for Fault Condition Monitoring in Three-Phase Induction Motors

2006 ◽  
Author(s):  
Xin Xue ◽  
V. Sundararajan ◽  
Wallace P. Brithinee
Keyword(s):  
Wireless Sensor Networks ◽  
Sensor Networks ◽  
Condition Monitoring ◽  
Electromagnetic Interference ◽  
Wireless Sensors ◽  
Induction Motors ◽  
Base Station ◽  
Wireless Sensor ◽  
Signal Spectrum ◽  
Three Phase

A commonly used technique for the detection of faults in large three-phase induction motors is to measure the supply current to the motor and analyze the signal spectrum. This technique is well established and has been shown to be indicative of a faulty condition. However, current signature analysis is usually used by very skilled technicians using expensive equipment. A cost effective condition monitoring technique is needed for smaller motors (those smaller than 200 HP). A motor's heat signature tells more about its quality and condition. For heavy-duty motors, it is very important to detect overheating because hot windings deteriorate rapidly. This paper explores the possibilities of using wireless sensors inside the motor. Wireless sensors are gaining popularity in condition monitoring applications because of their relatively low cost and ease of installation. This paper proposes a system of condition monitoring of the three-phase induction motor using wireless sensor networks (WSN) to measure the temperature and the vibration signals. The sensor nodes are placed on the rotor and the stator. The data acquisition is accomplished at a base station located at a distance of 6 feet. Issues related to electromagnetic interference between the wireless devices and the magnetic fields present within the motor are investigated.

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