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Related Concept Videos

Lossy Lines and Overvoltages01:22

Lossy Lines and Overvoltages

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Transmission-line series resistance and shunt conductance cause three primary effects: attenuation, distortion, and power losses.
Attenuation
When constant series resistance and shunt conductance are present, voltage and current equations are modified. The propagation constant indicates that voltage and current waves consist of both forward and backward traveling components. These waves attenuate as they propagate, with the attenuation factor related to the resistance and conductance. In a...
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Maximum Power Flow and Line Loadability01:23

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The maximum power flow for lossy transmission lines is derived using ABCD parameters in phasor form. These parameters create a matrix relationship between the sending-end and receiving-end voltages and currents, allowing the determination of the receiving-end current. This relationship facilitates calculating the complex power delivered to the receiving end, from which real and reactive power components are derived.
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Power flow problem analysis is fundamental for determining real and reactive power flows in network components, such as transmission lines, transformers, and loads. The power system's single-line diagram provides data on the bus, transmission line, and transformer. Each bus k in the system is characterized by four key variables: voltage magnitude Vk​, phase angle δk​, real power Pk​, and reactive power Qk​. Two of these four variables are inputs, while the...
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Determining the subtransient fault current in a power system involves representing transformers by their leakage reactances, transmission lines by their equivalent series reactances, and synchronous machines as constant voltage sources behind their subtransient reactances. In this analysis, certain elements are excluded, such as winding resistances, series resistances, shunt admittances, delta-Y phase shifts, armature resistance, saturation, saliency, non-rotating impedance loads, and small...
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Line Loss01:10

Line Loss

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The different configurations of source-load connections include wye (star) and delta connections. The relationship between line and phase voltages and currents varies depending on the configuration. When the source is supplying power, it is transmitted through the wires to the load, and during this transmission, some power is absorbed by the wires, leading to line loss.
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Reducing Line Loss01:18

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In a three-phase circuit, line loss is an indicator of energy dissipated as heat due to the resistance of transmission lines. To address this, incorporating transformers into the system—a step-up transformer at the source and a step-down transformer at the load—is a strategic solution. Two three-phase transformers are introduced to improve this.
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Analysis of Compromising Video Disturbances through Power Line.

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Summary

This study reveals that unintentional electromagnetic disturbances from electronic devices, particularly display video signals, can leak sensitive information over long distances via power lines. Researchers demonstrated data recovery up to 50 meters, highlighting significant security vulnerabilities.

Keywords:
TEMPESTcompromisingdistancemeasurementpropagationprotectionrecoverysignal to noise ratiounintendedvideo

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Area of Science:

  • Information Security
  • Electromagnetics
  • Computer Engineering

Background:

  • Electronic equipment unintentionally generates electromagnetic disturbances.
  • TEMPEST research focuses on these emanations and information protection methods.
  • Display video signals are identified as a critical vulnerability for information leakage.

Purpose of the Study:

  • To investigate the long-range propagation of electromagnetic disturbances from display video signals.
  • To demonstrate the feasibility of recovering sensitive information via these emanations.
  • To raise awareness about these security vulnerabilities and propose countermeasures.

Main Methods:

  • Analysis of electromagnetic disturbances in the TEMPEST domain.
  • Experimental setup to measure signal propagation on power lines.
  • Signal-to-noise ratio analysis for vulnerability assessment.

Main Results:

  • Demonstrated far-range propagation of display video signal disturbances on power lines for the first time.
  • Successfully recovered processed information at distances of 1, 10, and 50 meters.
  • Quantified signal-to-noise ratios to assess the threat level.

Conclusions:

  • Information leakage through unintentional electromagnetic emanations, especially from video signals, poses a significant risk.
  • Long-distance propagation via power lines is a previously underestimated vulnerability.
  • Implementing countermeasures is crucial to protect sensitive data and personal privacy.