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Related Concept Videos

Transmission Line Design Considerations01:23

Transmission Line Design Considerations

166
Aluminum has become the material of choice for overhead transmission lines, surpassing copper due to its abundance and cost-effectiveness. The most prevalent type is the aluminum conductor, steel-reinforced (ACSR), which combines aluminum strands around a steel core. Other variants include all-aluminum conductors (AAC), all-aluminum alloy conductors (AAAC), aluminum conductor alloy-reinforced (ACAR), and aluminum-clad steel conductors. Advanced designs, such as aluminum conductors with steel...
166
Capacitance: Single-Phase And Three-Phase Line01:25

Capacitance: Single-Phase And Three-Phase Line

188
In electrical power systems, understanding the capacitance of transmission lines is fundamental for efficient operation.
Single-Phase Lines
Consider a single-phase, two-wire transmission line with equal phase spacing energized by a voltage source. One conductor carries a uniform positive charge, while the other carries an equal negative charge. The capacitance C of the line can be derived from the voltage V between the conductors. For a one-meter section of the line, the capacitance is given...
188
Boundary Conditions: Lossless Lines01:21

Boundary Conditions: Lossless Lines

114
Consider a single-phase, two-wire, lossless transmission line terminated by an impedance at the receiving end and a source with Thevenin voltage and impedance at the sending end. The line, with length, has a surge impedance and wave velocity determined by the line's inductance and capacitance.
At the receiving end, the boundary condition states that the voltage equals the product of the receiving-end impedance and current. This relationship is expressed as a function of the incident and...
114
Lossy Lines and Overvoltages01:22

Lossy Lines and Overvoltages

107
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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Transmission-Line Differential Equations01:26

Transmission-Line Differential Equations

340
Transmission lines are essential components of electrical power systems. They are characterized by the distributed nature of resistance (R), inductance (L), and capacitance (C) per unit length. To analyze these lines, differential equations are employed to model the variations in voltage and current along the line.
Line Section Model
A circuit representing a line section of length Δx helps in understanding the transmission line parameters. The voltage V(x) and current i(x) are measured...
340
Design Example: Strain Gauge Bridge or Wheatstone Bridge01:15

Design Example: Strain Gauge Bridge or Wheatstone Bridge

440
The utilization of strain gauges as transducers for converting mechanical strain into electrical signals is a common practice in various engineering applications. These strain gauges are frequently integrated into Wheatstone bridge circuits to accurately measure parameters such as force or pressure. Within this context, each element within the circuit exhibits a resistance that undergoes subtle variations when subjected to mechanical strain. The primary objective is to convert minuscule...
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Calibration of Vector Network Analyzer for Measurements in Radio Frequency Propagation Channels
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Transmission Line Voltage Measurement Utilizing a Calibrated Suspension Grounding Voltage Sensor.

Rujin Huang1, Wenbin Zhang2, Junyu Zhu1

  • 1College of Science, Kunming University of Science and Technology, Kunming 650504, China.

Sensors (Basel, Switzerland)
|August 26, 2023
PubMed
Summary

This study introduces a self-calibration method for suspension grounding voltage sensors, enhancing accuracy in power distribution networks. The innovative technique ensures precise voltage measurements without needing power failure or known input, improving grid monitoring and fault diagnosis.

Keywords:
internal capacitance transformationself-calibrationsuspension groundingvoltage measurement

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Area of Science:

  • Electrical Engineering
  • Power Systems
  • Measurement Science

Background:

  • Accurate voltage measurement is crucial for power dispatching and fault diagnosis in distribution networks.
  • Spatial electric field effect voltage sensors offer ungrounded, distributed measurement of transmission line voltages.
  • Existing suspension grounding voltage sensors face accuracy limitations due to environmental factors like height and distance.

Purpose of the Study:

  • To develop and validate a self-calibration method for suspension grounding voltage sensors.
  • To quantify and mitigate the impact of external electric fields on measurement accuracy.
  • To improve the reliability and applicability of distributed voltage sensing in power systems.

Main Methods:

  • A self-calibration method utilizing internal capacitance transformation.
  • On-line calibration achieved by switching parameters in the conditioning circuit without power interruption or known excitation.
  • Simulation research to quantify inter-phase electric field interference and design of an equipotential shielding structure.

Main Results:

  • The self-calibration method achieved a maximum relative voltage amplitude error of 1.65% and a phase error of 0.94% in laboratory tests.
  • Measurement accuracy was independent of sensor height to ground and distance to the telegraph pole.
  • The equipotential shielding probe reduced voltage measurement deviation to a maximum of 0.7% under interference conditions.

Conclusions:

  • The proposed self-calibration method effectively enhances the accuracy of suspension grounding voltage sensors.
  • The developed sensor and shielding structure are robust against environmental variations and external electric field interference.
  • This technology enables reliable, distributed voltage measurement for improved power grid management and diagnostics.