Topic
Liquid dielectric
About: Liquid dielectric is a research topic. Over the lifetime, 3702 publications have been published within this topic receiving 45150 citations.
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TL;DR: In this paper, the authors report on studies made on a full-scale model of the coolant system for a gas insulated, fluorocarbon liquid cooled HVDC thyristor valve.
Abstract: The objective of this paper is to report on studies made on a fullscale model of the coolant system for a gas insulated, fluorocarbon liquid cooled HVDC thyristor valve. Confidence in the selection of the coolant system and its associated dielectric containment structure stemmed from the parametric study of the coolant, and the more than adequate dielectric strength of the coolant even when it was in the cavitated state. An explanation is proposed on the apparent anomoly of the exceptional dielectric strength of the system, even when bubble nucleation is induced by the injection of a dielectrically weak (nitrogen) gas into the flowing coolant.
12 citations
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01 Dec 2015
TL;DR: In this article, a dry power supply for immersion-cooled information handling systems (IHSs) is described and a power supply coupled to the IHS and configured to provide power to one or more components via an adaptor.
Abstract: Systems and methods for a dry power supply for immersion-cooled Information Handling Systems (IHSs) are described In some embodiments, an IHS may include: a chassis configured to be at least partially disposed under a surface of a dielectric liquid coolant, where the chassis includes one or more components configured to be cooled by the dielectric liquid coolant during operation of the IHS; and a power supply coupled to the chassis and configured to provide power to the one or more components via an adaptor configured to maintain the power supply above the surface of the dielectric liquid coolant during operation of the IHS, where the power supply comprises a fan configured to blow air
12 citations
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TL;DR: In this article, the first voltage breakdown voltage measurements made with a great number of fresh (unsparked) sphere gaps were presented and discussed, and examples for typical conditioning effects resulting from repeated sparking of one gap are given and discussed.
Abstract: A cryogenic system for the investigation of the dielectric properties of liquid helium is described. Results of first breakdown voltage measurements made with a great number of fresh (unsparked) sphere gaps are presented. Examples for typical conditioning effects resulting from repeated sparking of one gap are given and discussed. A main objective of this work has been the study of the influence of electrode material on the first voltage breakdown in freshly prepared sphere gaps.
12 citations
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TL;DR: In this article, a percolative approach to model liquid dielectric breakdown is presented. But the model is not applicable to mixtures and facilitates the inclusion of air bubbles.
Abstract: A percolative approach, useful in modeling liquid dielectric breakdown, is presented. The dielectric is treated as a network of resistors having random values and breakdown characteristics based on a specified statistical distribution. The method is quite general, and lends itself to the inclusion of internal fluctuations and localized heating. It should also be applicable to mixtures and facilitate the inclusion of air bubbles. Despite its simplicity, the model successfully characterizes fractal structure in dielectric breakdown. In particular, the fractal dimension for a two-dimensional (2-D) lattice as given by the exponent of a power law, agrees with the theoretical value. The dependence of critical external voltage on the internal disorder is also investigated. It is shown that the overall breakdown process consists of the successive breakdown of individual elements to finally form a percolation cluster. The clusters have a typical dendrite structure. Also, in keeping with qualitative expectations, it is shown that V/sub br/ decreases with the disorder and increases with resistor variance.
12 citations
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TL;DR: A sensor is presented that allows the determination of the moisture content of the transformer solid insulation in the steady state and during the moisture migration processes, and the main objective of the design is that the electrodes should not obstruct the movement of water from the solid insulation to the oil.
Abstract: Moisture is an important variable that must be kept under control to guarantee a safe operation of power transformers. Because of the hydrophilic character of cellulose, water mainly remains in the solid insulation, while just a few parts per million are dissolved in oil. The distribution of moisture between paper and oil is not static, but varies depending on the insulation temperature, and thus, water migration processes take place continuously during transformers operation. In this work, a sensor is presented that allows the determination of the moisture content of the transformer solid insulation in the steady state and during the moisture migration processes. The main objective of the design is that the electrodes of the sensor should not obstruct the movement of water from the solid insulation to the oil, so the proposed prototype uses a metallic-mesh electrode to do the measurements. The measurement setup is based on the characterization of the insulation dielectric response by means of the frequency dielectric spectroscopy (FDS) method. The sensitivity of the proposed sensor has been tested on samples with a moisture content within 1% to 5%, demonstrating the good sensitivity and repeatability of the measurements.
12 citations