Voltage Gradient Control
Voltage Gradient Control - Related Videos
01:21
Generator Voltage Control
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2024
Generator voltage control is crucial for maintaining the stable operation of synchronous generators and wind turbines. In older models, a DC generator driven by the rotor delivers DC power to the rotor's field winding, and the power is transferred through slip rings and brushes. In the latest models, static or brushless exciters are used. Static exciters rectify AC power from the generator terminals and then transfer the DC power directly to the rotor. Brushless exciters, on the other hand, use...
02:42
In Vitro Disassembly of the Influenza A Virus Core Using pH-Controlled Gradient Centrifugation
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2026
Source: Stauffer, S. et al. In Vitro Disassembly of Influenza A Virus Capsids by Gradient Centrifugation. J. Vis. Exp. (2016)This video demonstrates the pH-dependent disassembly of influenza A virus (IAV) cores using gradient ultracentrifugation. It outlines glycerol gradient preparation, ultracentrifugation, and how different pH conditions affect IAV core disassembly.
08:42
Density Gradient Ultracentrifugation
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2023
Density gradient ultracentrifugation is a common technique used to isolate and purify biomolecules and cell structures. This technique exploits the fact that, in suspension, particles that are more dense than the solvent will sediment, while those that are less dense will float. A high-speed ultracentrifuge is used to accelerate this process in order to separate biomolecules within a density gradient, which can be established by layering liquids of decreasing density in a centrifuge tube. The...
08:23
Characterization of Sickling During Controlled Automated Deoxygenation with Oxygen Gradient Ektacytometry
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Cited by 16 •
2019
Here, we present oxygen gradient ektacytometry, a rapid and reproducible method to measure red blood cell deformability in samples from patients with sickle cell disease under controlled deoxygenation and reoxygenation. This technique provides a way to study red blood cell sickling and to monitor sickle cell disease treatment efficacy.
01:13
Voltage
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2024
The movement of electrons in a conductor requires some form of energy or work, usually provided by an external force, like a battery. This force is called the electromotive force or voltage. The voltage between two points, referred to as points "a" and "b," in an electric circuit is the energy (or work) needed to move a unit charge from point "a" to point "b," and this relationship is expressed mathematically as In this equation, "w" represents the energy measured in joules (J), and "q"...
FAQs
Sharp edges and abrupt material interfaces can concentrate electric potential changes instead of distributing them smoothly. That concentration increases local electrical stress and may promote partial discharge, corona, or dielectric breakdown in high-voltage equipment. Adjusting electrode geometry and insulation around these features helps create a more predictable field, supporting reliable operation and reducing the likelihood of premature insulation failure.
Resistive and capacitive grading provide alternative ways to distribute potential differences across an engineered structure. By incorporating either form of grading, engineers can reduce localized field concentration and shape how voltage changes through the device or insulation system. The choice is relevant when electrode geometry and spacing alone do not provide sufficiently uniform electric-field conditions for predictable performance.
Electrode geometry, insulation, spacing, and the selected grading approach are central design variables. Geometry affects where electric fields concentrate, while insulation and spacing influence how potential differences are separated across a distance. Resistive or capacitive grading can further redistribute the voltage. Considering these variables together helps engineers limit electrical overstress and maintain consistent device behavior.
A practical design sequence begins by identifying locations where potential differences may concentrate, especially near sharp electrodes or material interfaces. Engineers can then adjust electrode geometry, insulation, and spacing, followed by selecting resistive or capacitive grading when needed. The resulting arrangement should be assessed for more even potential distribution and its ability to limit partial discharge, corona, or breakdown.
The approach applies wherever electric-field uniformity affects safety, efficiency, reliability, or measurement accuracy. Relevant systems include high-voltage cables and transformers, sensors, and electrochemical devices. In each case, engineers tailor geometry, insulation, spacing, or grading to the system’s needs. This supports predictable electrical behavior across equipment with different operating purposes and field-distribution requirements.
Improved distribution can reduce electrical overstress and limit conditions associated with partial discharge, corona, and dielectric breakdown. These outcomes matter because they support greater reliability and longer service life in high-voltage equipment. In sensors and other devices, a more uniform field can also help preserve measurement accuracy and consistent operation, linking field design directly to functional performance.