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Related Concept Videos

Directional Relays01:25

Directional Relays

91
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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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.
255
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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Lossless Lines01:23

Lossless Lines

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In electrical engineering, a lossless transmission line is characterized by a purely imaginary propagation constant and a resistive characteristic impedance. The ABCD parameters, which describe the relationship between the input and output voltages and currents, indicate an equivalent π circuit with an imaginary series impedance and a shunt admittance. This results in a transmission line that, when the product of the phase constant (beta) and the length of the line is less than pi,...
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Cable Subjected to a Distributed Load01:24

Cable Subjected to a Distributed Load

635
The analysis of suspension bridges is a complex and critical process that involves multiple factors, including the shape and tension of the main cables. The main cables of suspension bridges are subjected to distributed loads, which result in changes in tensile forces and deformation of the cable. These loads must be carefully considered to ensure that the bridge is safe and capable of supporting the weight of different loads.
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Line Protection with Impedance Relays01:27

Line Protection with Impedance Relays

65
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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Related Experiment Video

Updated: Jun 3, 2025

Automated Deployment of an Internet Protocol Telephony Service on Unmanned Aerial Vehicles Using Network Functions Virtualization
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Delay/Disruption Tolerant Networking Performance Characterization in Cislunar Relay Communication Architecture.

Ding Wang1, Ethan Wang2, Ruhai Wang3

  • 1School of Mathematics and Computer Science, Northwest Minzu University, Lanzhou 730030, China.

Sensors (Basel, Switzerland)
|January 11, 2025
PubMed
Summary

Future 7G/8G networks will integrate space and terrestrial communication. This study evaluates Delay/Disruption Tolerant Networking (DTN) protocol configurations for optimal performance in cislunar space networks.

Keywords:
sensor networksspace networksspace vehiclesspace vehicular networksvehicle-to-everything (V2X) networks

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Area of Science:

  • Space communication networks
  • Future wireless communication technologies (7G/8G)
  • Interplanetary internet infrastructure

Background:

  • Future 7G/8G networks will integrate terrestrial and space-based systems, including interplanetary networks (cislunar, deep-space) and Vehicle-to-Everything (V2X) communications.
  • Space and V2X networks are expected to converge, involving both spacecraft and terrestrial vehicles.
  • Delay/Disruption Tolerant Networking (DTN) is identified as the sole viable technology for these heterogeneous future space communication networks.

Purpose of the Study:

  • To investigate concatenations of different DTN convergence layer protocol adapters (CLAs) within a cislunar relay communication architecture.
  • To characterize and compare the performance of various DTN CLA concatenations and their associated data transport protocols.
  • To identify the optimal network relay path and DTN protocol configuration for end-to-end cislunar communication.

Main Methods:

  • Experimental performance characterization of different DTN CLA concatenations.
  • Evaluation over a representative primary and secondary cislunar relay architecture.
  • Comparative analysis of data transport protocols within the DTN framework.

Main Results:

  • Performance metrics for various DTN CLA concatenations were experimentally determined.
  • Different relay paths and DTN protocol configurations exhibited varying end-to-end performance over the cislunar link.
  • Specific DTN configurations demonstrated superior efficiency in the tested cislunar relay architecture.

Conclusions:

  • The choice of DTN CLA concatenation and relay path significantly impacts communication performance in cislunar networks.
  • Experimental validation provides crucial insights for optimizing DTN protocols for future space-based internet infrastructure.
  • This research contributes to the development of robust and efficient communication systems for interplanetary and V2X integrated networks.