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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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A communication barrier is any distortion or interruption during a conversation, resulting in miscommunication of the message. A good communicator should know these barriers and continuously check for the listener's understanding by obtaining feedback.
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The barriers to effective communication also include cultural barriers, semantic barriers, gender barriers, and time constraints.
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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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Neurons, the fundamental units of the brain and nervous system, communicate through complex electrochemical signals that underpin all cognitive and bodily functions. This communication is primarily facilitated by a process involving the generation and propagation of an action potential along the axon of the neuron. When the internal electrical charge of a neuron surpasses a certain threshold, an action potential is triggered. This rapid change in voltage travels swiftly along the axon to the...
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A signal x(t) is a set of data or a time function representing a variable of interest. Signals typically convey information about a phenomenon, such as atmospheric temperature, humidity, human voice, television images, a dog's bark, or birdsongs. More generally, a signal can be a function of more than one independent variable. For instance, images depend on horizontal and vertical positions and can be regarded as two-dimensional signals. However, this text will focus on one-dimensional...
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Unidirectional Communications in Secure IoT Systems-A Survey.

Lucian Gaina1, Cristina Sorina Stangaciu1, Daniela Stanescu1

  • 1Department of Computer and Information Technology, Politehnica University of Timisoara, 300006 Timisoara, Romania.

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Summary

This survey explores unidirectional communication methods like data diodes for enhanced Internet of Things (IoT) security in critical infrastructure. It analyzes their performance, security, and cost-effectiveness for industrial applications.

Keywords:
Internet of Things (IoT)critical infrastructuredata diodesnetwork pumpssecurityunidirectional communicationsunidirectional gatewaysunidirectional protocols

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Area of Science:

  • Cybersecurity
  • Network Engineering
  • Industrial Control Systems

Background:

  • Internet of Things (IoT) systems face significant security challenges, especially within critical infrastructure.
  • Unidirectional communication offers a novel approach to bolster IoT security, yet remains underexplored in this domain.
  • Existing security measures often struggle to meet the stringent demands of critical infrastructure protection.

Purpose of the Study:

  • To survey and analyze prevalent unidirectional communication solutions for IoT security.
  • To evaluate these solutions based on implementation, operational mode, performance, security, and cost-effectiveness.
  • To identify current industry implementations, challenges, and future development directions for unidirectional IoT security.

Main Methods:

  • Comprehensive literature review of unidirectional communication technologies.
  • Classification of solutions: data diodes, network pumps, unidirectional gateways, and protocols.
  • Comparative analysis based on security features, performance metrics, and economic factors.
  • Examination of commercially available off-the-shelf unidirectional communication products.

Main Results:

  • Data diodes, network pumps, unidirectional gateways, and protocols were identified as key unidirectional communication methods.
  • Analysis revealed varying levels of security, performance, and cost across different solutions.
  • Off-the-shelf implementations were assessed, highlighting industry adoption and limitations.
  • Key challenges and promising future research and development avenues were identified.

Conclusions:

  • Unidirectional communication presents a viable and effective paradigm for enhancing IoT security in critical infrastructure.
  • The choice of solution depends on a trade-off between security requirements, performance needs, and implementation costs.
  • Further research and development are crucial to optimize existing solutions and explore new unidirectional communication techniques for robust IoT security.