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Related Concept Videos

Energy Losses in Transformers01:21

Energy Losses in Transformers

859
In an ideal transformer, it is assumed that there are no energy losses, and, hence, all the power at the primary winding is transferred to the secondary winding. However, in reality,  the transformers always have some energy losses, and, hence, the output power obtained at the secondary winding is less than the input power at the primary winding due to energy losses.
There are four main reasons for energy losses in transformers.
The first cause can be  the high resistance of the...
859
Types Of Transformers01:16

Types Of Transformers

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Transformers can provide desired voltages to a circuit by modifying the number of turns in the secondary windings.
If the ratio of the number of turns in the secondary winding to that of the primary winding is greater than one, then the transformer is said to be a step-up transformer. In a step-up transformer, the voltage at the secondary winding is greater than the voltage applied at the primary winding.
However, if this ratio is less than one, the transformer is said to be a step-down...
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Transformers in Distribution System01:27

Transformers in Distribution System

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Transformers in distribution systems can be broadly categorized into distribution substation transformers and other distribution transformers. They are crucial for stepping down high transmission voltages to levels suitable for distribution and end-user applications.
Distribution substation transformers come in various ratings and typically use mineral oil for insulation and cooling. To prevent moisture and air from entering the oil, some transformers use an inert gas like nitrogen to fill the...
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Instrument Transformers01:23

Instrument Transformers

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Instrument transformers, comprising voltage transformers (VTs) and current transformers (CTs), play crucial roles in power substations by providing isolated replicas of current or voltage for measurement and protection purposes. Voltage transformers reduce the primary voltage to levels suitable for relay operation and measurement, while current transformers scale down the primary current. The primary winding of a current transformer often consists of a single turn, achieved by threading the...
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Related Experiment Video

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Design and Analysis for Fall Detection System Simplification
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Tag-free indoor fall detection using transformer network encoder and data fusion.

Muhammad Zakir Khan1, Muhammad Usman2, Jawad Ahmad3

  • 1University of Glasgow, James Watt School of Engineering, Glasgow, G12 8QQ, UK.

Scientific Reports
|July 21, 2024
PubMed
Summary

This study introduces a novel radio frequency identification (RFID) system for elderly fall detection, offering a comfortable, contactless alternative to wearables. The system uses passive ultra-high frequency (UHF) tags and a transformer model for accurate fall recognition.

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Area of Science:

  • Engineering
  • Computer Science
  • Gerontology

Background:

  • Wearable devices for elderly fall detection can be uncomfortable and impact user experience.
  • Existing methods often require close proximity or multiple sensors for reliable monitoring.

Purpose of the Study:

  • To develop a contactless, unobtrusive fall detection system for the elderly using RFID technology.
  • To evaluate the performance of a transformer model combined with data fusion for enhanced fall detection accuracy.

Main Methods:

  • Utilized a passive ultra-high frequency (UHF) tag array for unobtrusive monitoring.
  • Processed received signal strength indicator (RSSI) and phase data from battery-less tags.
  • Employed a transformer model with data fusion for activity recognition and fall detection.

Main Results:

  • Achieved an average fall detection accuracy exceeding , surpassing CNN, RNN, and LSTM methods.
  • Demonstrated reliable performance beyond a 3-meter range with minimal UHF tags and a single antenna.
  • The contactless RFID approach proved practical and cost-effective.

Conclusions:

  • The proposed RFID-based system offers a promising, accurate, and user-friendly solution for elderly fall detection.
  • Transformer models combined with data fusion significantly enhance fall detection capabilities.
  • This technology presents a viable alternative to traditional wearable sensors.