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Related Concept Videos

Line Protection with Impedance Relays01:27

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.
Under normal conditions, low load currents keep the measured...
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Pilot and Numeric Relaying01:21

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Pilot relaying is a type of differential protection used in power systems. It compares electrical quantities at the terminals of equipment via a communication channel instead of direct relay interconnection. This method is essential for transmission lines where the terminals are far apart, typically up to 80 km for lines with 69 to 115 kV ratings. Four types of communication channels are used for pilot relaying:
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Directional Relays01:25

Directional Relays

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Directional relays, essential for managing unidirectional fault currents, enhance the safety and efficiency of power systems. On power lines equipped with directional relays, faults downstream (to the right) of the current transformer typically cause the fault current to lag the bus voltage by approximately 90 degrees, known as the forward direction. In contrast, upstream (left-side) faults may result in the fault current leading the bus voltage by nearly 90 degrees, termed the reverse...
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Differential Relays01:20

Differential Relays

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Differential relays are used to protect generators, buses, and transformers by comparing electrical quantities at different points. When a fault occurs, the difference in current between the two points triggers the relay to operate, opening the circuit breaker. Under normal conditions, the current entering (i1) and leaving (i2) a generator are equal. When a fault occurs, however, these currents become unequal, and the difference current flows in the relay operating coil, causing the relay to...
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Network Function of a Circuit01:25

Network Function of a Circuit

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Frequency response analysis in electrical circuits provides vital insights into a circuit's behavior as the frequency of the input signal changes. The transfer function, a mathematical tool, is instrumental in understanding this behavior. It defines the relationship between phasor output and input and comes in four types: voltage gain, current gain, transfer impedance, and transfer admittance. The critical components of the transfer function are the poles and zeros.
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Zones of Protection01:16

Zones of Protection

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In power systems, the entire setup is divided into protective zones to isolate faults and protect the rest of the network. These zones include generators, transformers, buses, transmission lines, distribution lines, and motors. Each zone can be visualized as a separate room in a house, with each room protected by its own circuit breaker.
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Large Scale Energy Efficient Sensor Network Routing Using a Quantum Processor Unit
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Physical Layer Security in Two-Way SWIPT Relay Networks with Imperfect CSI and a Friendly Jammer.

Maymoona Hayajneh1, Thomas Aaron Gulliver1

  • 1Department of Electrical and Computer Engineering, University of Victoria, P.O. Box 1700, STN CSC, Victoria, BC V8W 2Y2, Canada.

Entropy (Basel, Switzerland)
|January 21, 2023
PubMed
Summary

This study enhances two-way relay communication security against eavesdroppers using energy harvesting and a friendly jammer. Optimal relay and jammer placement significantly boosts secure communication capacity.

Keywords:
amplify and forwardeavesdropperimperfect channel state informationrelaysecrecy capacitysimultaneous wireless information and power transfertime switchingtwo-way

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Area of Science:

  • Wireless communication security
  • Information-theoretic security

Background:

  • Two-way relay systems face eavesdropping threats.
  • Energy harvesting relays require efficient resource allocation.
  • Jamming is a viable countermeasure against eavesdropping.

Purpose of the Study:

  • To investigate and maximize the secrecy capacity of energy harvesting two-way relay systems.
  • To analyze the impact of jammer deployment and imperfect channel information on security.
  • To optimize system parameters for enhanced secure communication.

Main Methods:

  • Employing time switching for energy harvesting and information decoding.
  • Utilizing geometric programming (GP) for joint optimization of time switching and transmit power.
  • Analyzing the effects of jammer location and imperfect channel state information.

Main Results:

  • Secrecy capacity is significantly improved with a friendly jammer.
  • Optimal relay placement at the midpoint between users maximizes secrecy capacity.
  • Jammer proximity to the eavesdropper enhances security by reducing signal-to-noise ratio.

Conclusions:

  • Energy harvesting relays combined with friendly jammers offer robust security solutions.
  • System design must consider node placement for optimal secrecy capacity.
  • GP provides an effective framework for optimizing secure wireless communication systems.