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The practical equivalent circuits of single-phase two-winding transformers exhibit significant deviations from their idealized versions due to the inherent properties of winding resistance and finite core permeability. These properties result in real and reactive power losses, affecting the transformer's performance. Understanding these deviations is crucial for designing more efficient transformers.
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Capacitive dividers (CDs) in medium-voltage networks can accurately measure voltage across a wide frequency range. Proper modeling accounts for temperature variations and self-resonances, enhancing their utility for power quality assessment.

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Area of Science:

  • Electrical Engineering
  • Power Systems

Background:

  • Capacitive dividers (CDs) evolved from simple voltage detectors to essential tools for accurate voltage measurement in medium-voltage (MV) networks.
  • The integration of intelligent electronic devices and renewable energy sources necessitates precise voltage monitoring for power quality assessment.

Purpose of the Study:

  • To model and analyze the frequency-dependent behavior of off-the-shelf capacitive dividers.
  • To investigate the impact of temperature variations on capacitive divider performance.
  • To determine the suitability of capacitive dividers for wide-frequency measurements, including supraharmonic and partial discharge levels.

Main Methods:

  • Development of specific experimental setups for testing capacitive dividers.
  • Performance of comprehensive tests across a wide range of frequencies.
  • Modeling of capacitive dividers to simulate their behavior under varying conditions.

Main Results:

  • Accurate modeling of capacitive dividers enables their use for measurements across a broad frequency spectrum.
  • Temperature variations were analyzed and their effects on measurement accuracy were understood.
  • Self-resonances within capacitive dividers were identified and characterized.

Conclusions:

  • Capacitive dividers, when properly modeled, are versatile instruments for accurate voltage measurements in MV networks.
  • Their application extends to high-frequency phenomena, crucial for comprehensive power quality analysis.
  • Understanding temperature effects and self-resonances is key to maximizing the utility of capacitive dividers.