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Related Concept Videos

Capacitance: Single-Phase And Three-Phase Line01:25

Capacitance: Single-Phase And Three-Phase Line

235
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...
235
Fault Types01:18

Fault Types

135
When analyzing a single line-to-ground fault from phase A to ground at a three-phase bus, it is important to consider the fault impedance. This impedance is zero for a bolted fault, equal to the arc impedance for an arcing fault, and represents the total fault impedance for a transmission-line insulator flashover. To derive sequence and phase currents, fault conditions are translated from the phase domain to the sequence domain.
For line-to-line faults occurring between phases B and C, the...
135
Three-Phase Voltages01:30

Three-Phase Voltages

319
A three-phase generator produces three voltages that are equal in magnitude but have a phase difference of 120 degrees. This identical magnitude and equal phase separated voltages are known as the balanced voltages and help to minimize power loss while ensuring a steady delivery of energy to connected loads. As voltage sources in a three-phase system can be configured in a wye or a delta formation, the loads connected to these systems can also be arranged in either configuration. This...
319
Electrostatic Boundary Conditions01:16

Electrostatic Boundary Conditions

628
Consider an external electric field propagating through a homogeneous medium. When the electric field crosses the surface boundary of the medium, it undergoes a discontinuity. The electric field can be resolved into normal and tangential components. The amount by which the field changes at any boundary is given by the difference between the field components above and below the surface boundary.
The surface integral of an electric field is given by Gauss's law in integral form and is related to...
628
Three-Phase Short Circuit—Unloaded Synchronous Machine01:21

Three-Phase Short Circuit—Unloaded Synchronous Machine

252
Conducting a three-phase short circuit test on an unloaded synchronous machine helps understand its impact on the system. The AC fault current's oscillogram, with the DC offset removed, reveals that the waveform amplitude decreases from an initially high value to a steady-state level for one phase of the machine.
This behavior occurs due to the magnetic flux produced by the short-circuit armature currents. Initially, these currents follow high-reluctance paths but eventually shift to...
252
The Delta-to-Delta Circuit01:17

The Delta-to-Delta Circuit

775
In a delta-delta configuration, the source and the load are connected in a delta manner, forming a closed loop that divides the network into three distinct phases. This configuration makes the phase voltages identical to line voltages. Assuming the sources are in positive sequence, the phase voltages can be expressed directly without having a neutral wire.
775

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Related Experiment Video

Updated: Sep 29, 2025

Design and Application of a Fault Detection Method Based on Adaptive Filters and Rotational Speed Estimation for an Electro-Hydrostatic Actuator
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Adjustable object floating states based on three-segment three-phase contact line evolution.

An Li1,2,3,4, Huizeng Li1,3,4, Zhipeng Zhao1,2,3,4

  • 1Key Laboratory of Green Printing, Institute of Chemistry, Chinese Academy of Sciences (ICCAS), Beijing 100190, People's Republic of China.

Proceedings of the National Academy of Sciences of the United States of America
|March 22, 2022
PubMed
Summary
This summary is machine-generated.

Researchers developed a new method to control how objects float on water. This breakthrough, inspired by falling fruit, enables real-time regulation of floating states for diverse applications like robotics and solar energy.

Keywords:
floating robotfloating state regulationinterfacial effect

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Area of Science:

  • Physics
  • Materials Science
  • Engineering

Background:

  • Controlling the floating states of objects on water is crucial for various applications.
  • Real-time regulation of these states presents significant challenges.

Purpose of the Study:

  • To propose a facile strategy for transforming objects between different floating states.
  • To demonstrate the potential of this floating state transformation in novel applications.

Main Methods:

  • Inspired by the floating behavior of falling fruit.
  • Utilized a three-segment, three-phase contact line evolution for state transformation.

Main Results:

  • Successfully demonstrated the transformation of objects between different floating states.
  • Showcased the applicability of floating state transformation in solar-powered water evaporation, interface catalysis, and drug delivery.

Conclusions:

  • The proposed strategy offers insights into the regulation of floating states.
  • Floating state transformation holds significant potential for diverse technological advancements.