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Oil Quality Screens. Once in service the dielectric liquid should be tested periodically to make sure it retains its important properties such as good dielectric breakdown voltage low acidity and no sludge formation. The rate of deterioration of the insulating oil should be relatively slow.
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Get PriceGB/T 21216 insulating liquid measurement conductance and capacitance Test methods for determining dielectric loss factor (GB/T 21216-2007 IEC 61620.1998 IDT) GB/T 25961 electrically insulating oil test method Corrosive Sulfur DL/T 385 Transformer oil charging method for detecting predisposition DL/T 419 Power oil Terminology
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Get PriceThe term "quality factor" is more commonly associated with microwave resonators. Quality factor or Q is a measure of the power loss of a microwave system. For the microwave resonator losses can be of four types: (a) dielectric (b) conduction (c) radiation and (d) external [1].The dielectric Q d conduction Q c and radiation Q r quality factors are given by
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Get PriceA valuable tool for transformer diagnostics is sweep frequency response analysis (SFRA) which consists of measuring the impedance of transformer windings over a wide range of frequencies. Faults which change either the winding capacitances or the winding inductances are detectable. Fault simulation programs have indicated that the following faults are detectable using SFRA:
Get PriceIt is shown that microwave heating is not feasible for extracting oil from High Grade Oil Sands due to their very low water content (<0.5%) and consequently their low dielectric loss factor. Low Grade Oil Sands can be processed with bitumen recoveries in excess of 50% shown in this work and energy requirements around 200 kW h/tonne.
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Get PriceIn addition to high-voltage partial discharge tests the condition of the cable insulation can also be examined by means of dielectric measurements such as power/dissipation factor capacitance dielectric response. Measurements of temperature at different locations as well as oil pressure can also indicate the current cable load status.
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