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Line Protection with Impedance Relays

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Coordinating time-delay overcurrent relays in complex radial systems and directional overcurrent relays in multi-source transmission loops can be challenging. Impedance relays address these issues by responding to the voltage-to-current ratio, specifically measuring the apparent impedance of a line. These relays become more sensitive during faults as current increases and voltage decreases, thereby reducing the apparent impedance.
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Aluminum has become the material of choice for overhead transmission lines, surpassing copper due to its abundance and cost-effectiveness. The most prevalent type is the aluminum conductor, steel-reinforced (ACSR), which combines aluminum strands around a steel core. Other variants include all-aluminum conductors (AAC), all-aluminum alloy conductors (AAAC), aluminum conductor alloy-reinforced (ACAR), and aluminum-clad steel conductors. Advanced designs, such as aluminum conductors with steel...
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Wireless Measuring System for Monitoring the Condition of Devices Designed to Protect Line Structures.

Martin Pieš1, Radovan Hájovský1, Jan Velička1

  • 1Department of Cybernetics and Biomedical Engineering, VSB-Technical University of Ostrava, 17. listopadu 2172/15, 70800 Ostrava, Czech Republic.

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Summary

A new wireless monitoring system uses accelerometers and load anchor cells to track rock formation stability, providing real-time data for enhanced safety and infrastructure protection.

Keywords:
IQMESHIQRF®accelerometer sensordata processingload anchor cellmonitoring systemprotective fencewireless sensor network

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Area of Science:

  • Geotechnical Engineering
  • Wireless Sensor Networks
  • Geohazard Monitoring

Background:

  • Rock formations pose significant risks to infrastructure and traffic.
  • Existing stabilization methods like fences and barriers lack comprehensive monitoring.
  • A need exists for integrated systems with remote settings, data processing, and alarms.

Purpose of the Study:

  • To describe a unique wireless monitoring system for geotechnical quantities.
  • To present the design and implementation of systems for monitoring protective fences and slope shifts.
  • To introduce wireless accelerometric and load anchor cell sensors for enhanced geohazard assessment.

Main Methods:

  • Development of wireless accelerometric sensor nodes.
  • Development of wireless load anchor cell sensor nodes.
  • Utilizing IQRF® technology and IQMESH topology for wireless data transfer.
  • Data archiving in a MySQL database and visualization with Grafana.

Main Results:

  • Successful implementation and assessment of the wireless monitoring system in three case studies.
  • Demonstrated wireless data transfer from sensors to a central database.
  • Validated system performance under testing polygon, operational, and realistic conditions.

Conclusions:

  • The developed wireless monitoring system offers a comprehensive solution for assessing geotechnical risks.
  • The system enables real-time data acquisition and analysis for proactive hazard management.
  • Wireless sensor technology provides a flexible and efficient approach to monitoring critical infrastructure.