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Related Concept Videos

Pilot and Numeric Relaying01:21

Pilot and Numeric Relaying

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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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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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Numerous practical applications within engineering disciplines, such as telecommunications, necessitate optimizing power delivery to a connected load. This pursuit, however, entails inherent internal losses, which can either equal or exceed the power supplied to the load. The Thevenin equivalent circuit is helpful in finding the maximum power a linear circuit can deliver to a load. It is assumed in this context that the load resistance can be adjusted.
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Overcurrent Relays01:26

Overcurrent Relays

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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.
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Distribution Reliability and Automation01:25

Distribution Reliability and Automation

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Distribution reliability in electrical power systems is critical for ensuring an uninterrupted power supply to consumers at minimal cost. According to IEEE Standard Terms, reliability is the probability that a device will function without failure over a specified time period or amount of usage. For electric power distribution, this translates to maintaining continuous power supply and addressing customer concerns over power outages. Several indices, as defined by IEEE Standard 1366-2012, are...
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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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Relay Selection for Over-the-Air Computation Achieving Both Long Lifetime and High Reliability.

Jingyang Zhou1, Suhua Tang1

  • 1Department of Computer and Network Engineering, The University of Electro-Communications, Tokyo 182-8585, Japan.

Sensors (Basel, Switzerland)
|April 28, 2023
PubMed
Summary
This summary is machine-generated.

This study introduces a relay selection protocol for over-the-air computation (AirComp) in wireless sensor networks. The proposed method enhances network lifetime and reduces computation errors, especially for nodes with low channel gain.

Keywords:
Internet of Thingsover-the-air computation (AirComp)relay selection

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Area of Science:

  • Wireless Sensor Networks
  • Communication Systems
  • Signal Processing

Background:

  • Conventional wireless sensor networks face scalability issues with increasing node counts, leading to longer data collection/processing times and degraded spectrum efficiency.
  • Over-the-air computation (AirComp) offers an efficient alternative for statistical data aggregation but struggles with low channel gain nodes, causing high transmission power and computation errors.

Purpose of the Study:

  • To investigate relay communication strategies for AirComp to address challenges posed by low channel gain nodes.
  • To develop and evaluate a relay selection protocol that jointly optimizes computation error and power consumption, while considering network lifetime.

Main Methods:

  • Proposed a relay selection protocol for AirComp, initially selecting ordinary nodes with good channel conditions based on computation error and power consumption.
  • Enhanced the protocol to explicitly incorporate network lifetime considerations into the relay selection process.

Main Results:

  • The proposed relay selection protocol effectively mitigates issues associated with low channel gain nodes in AirComp systems.
  • Simulation results demonstrate that the enhanced protocol significantly prolongs the overall network lifetime.
  • The method also shows a marked reduction in computation errors compared to conventional approaches.

Conclusions:

  • Relay communication is a viable strategy to enhance the performance of AirComp in wireless sensor networks.
  • The developed relay selection protocol offers a practical solution for improving network lifetime and accuracy in AirComp systems.
  • Explicitly considering network lifetime in relay selection is crucial for sustainable and efficient wireless sensor network operation.