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Line Protection with Impedance Relays01:27

Line Protection with Impedance Relays

109
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...
109
Differential Relays01:20

Differential Relays

188
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...
188
Pilot and Numeric Relaying01:21

Pilot and Numeric Relaying

107
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:
107
Directional Relays01:25

Directional Relays

150
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...
150
Overcurrent Relays01:26

Overcurrent Relays

124
Overcurrent relays, crucial for circuit protection, are connected to the secondary current of a current transformer. There are two primary types of overcurrent relays: instantaneous and time-delay.
Instantaneous overcurrent relays activate immediately when the input current exceeds a predetermined value, known as the pickup current, instantly energizing the circuit breaker trip coil. This rapid response is vital for addressing severe faults quickly.
Time-delay overcurrent relays, on the other...
124
Reclosers and Fuses01:26

Reclosers and Fuses

136
Automatic circuit reclosers enhance the protection of distribution circuits by interrupting and auto-reclosing an AC circuit according to a preset sequence. They effectively manage temporary faults on overhead distribution lines, often caused by tree limbs or wildlife, by briefly disrupting service to improve overall reliability. However, contact with reclosers or energized broken conductors on the ground can pose serious hazards.
A comprehensive protection scheme for radial distribution...
136

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Related Experiment Video

Updated: Jul 26, 2025

Large Scale Energy Efficient Sensor Network Routing Using a Quantum Processor Unit
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Large Scale Energy Efficient Sensor Network Routing Using a Quantum Processor Unit

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Half-duplex and full-duplex interference mitigation in relays assisted heterogeneous network.

Moubachir Madani Fadoul1, Chee-Onn Chow1

  • 1Department of Electrical Engineering, Faculty of Engineering, University of Malaya, Kuala Lumpur, Malaysia.

Plos One
|June 20, 2023
PubMed
Summary
This summary is machine-generated.

This study eliminates interference in multicell relay networks using hybrid beamforming and power allocation. The proposed method significantly enhances system performance, improving ergodic capacity and reducing outage probability.

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Area of Science:

  • Wireless communication networks
  • Signal processing in telecommunications

Background:

  • Multicell environments with half-duplex (HD) and full-duplex (FD) relays face interference challenges like inter-relay interference (IRI), relay residual-interference (RSI), and relay-to-destination interference (RDI).
  • These interferences degrade system performance, causing lower ergodic capacity and higher outage probability, especially when subframes are not perfectly aligned.

Purpose of the Study:

  • To propose a novel scheme that effectively eliminates IRI, RSI, and RDI in multicell relay environments.
  • To optimize system capacity through joint power allocation for relays and destinations.

Main Methods:

  • Implementation of a hybrid zero-forcing and singular value decomposition (ZF-SVD) beamforming technique utilizing nullspace projection.
  • Application of joint power allocation (joint PA) strategies for relays and destinations.

Main Results:

  • The proposed hybrid ZF-SVD beamforming successfully eliminates IRI, RSI, and RDI, addressing limitations of previous studies.
  • Joint power allocation optimizes capacity, further enhancing system performance.

Conclusions:

  • The developed scheme demonstrates superior performance compared to baseline methods in terms of ergodic capacity and outage probability.
  • This research offers an effective solution for interference mitigation in advanced wireless relay systems.