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What is Du Noüy ring method?
Du Noüy ring method is a technique by which the surface tension of a liquid is measured. It involves slowly lifting a platinum ring from the surface of a liquid. The force required to raise the ring from the liquid's surface is measured and related to the liquid's surface tension.This method was proposed ...
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General information on petroleum products for Karl Fischer application
Petroleum products are mixtures of long-chain or aromatic hydrocarbons. They are hardly soluble in methanol. Water determination by Karl Fischer therefore requires the addition of solubilisers. For light oils, long-chain alcohols are suitable. For dissolving of heavier oils toluene, xylene or chloroform ...
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General information on hydrocarbons for Karl Fischer application
Saturated hydrocarbons can in most cases be titrated according to standard methods. To overcome solubility problems of unpolar or weakly polar substances, the additiion of a solubiliser to the solvent is necessary. In the case of long-chain and cyclic hydrocarbons, long-chain alcohols (such as propyl ...
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Dissolved Gas Analysis(DGA) can monitor potential failure risk of transformer
Electrical transformer transforms voltage from one level to another, usually from higher to lower voltage. Transformer uses oil as a coolant and insulator. Gases are formed within this oil due to natural aging and faults from oxidation, vaporization, oil breakdown, electrolytic action or insulation decomposition. ...
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Why does the oil need Acidity Test?
High acidities accelerate the degradation of the paper insulation and causes corrosion of the steel tanks. Usually, it is suggested that the oil needs to be changed when the acidity approaches 0.3mgKOH/g, and when the acidity reaches 0.1mgKOH/g, the user should concern the acid number. KL632 Automatic ...
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3 ways to extract the gas from the oil for gas analyzing
Insulating fluids, generally mineral oils, are used in transformers. Under normal and mild conditions, there is very little decomposition. Occasionally however, overheating of the oil occurs and decomposition products are formed. If the concentration of these gases reaches a critical point, the chances ...
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Working principle of transformer oil purifier
When the machine starts work, contaminated transformer oil enters into the primary filter where large size particles will be filtered off; after heating, the transformer oil enters into vacuum separator, under the conditions of high temperature, high vacuum degree, large area and high pumping speed, ...
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Procedure of on-line working of transformer oil purifier
The following preparations should be made: a. Prepare some clean transformer oil in an amount of 5% - 6% of the oil volume of the transformer; b. The outlet of the oil-discharging valve at the transformer bottom should match the inlet of the transformer oil purifier; c. Fill the vacuum tank with clean ...
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Why does transformer oil need to be purified?
The primary function of electrical insulating oil is to cool and insulate, also to eliminate electric arc when switch off. Under the action of heat and electromagnetic field, once transformer oil contacts with oxygen and gradually oxidized, it would generate alcohol, aldehyde, acid and the like, which ...
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Features of GC2010D transformer oil dissolved gas analyzer
GC2010D gas chromatograph special for analyzing transformer oil dissolved gases consists of sample injector, detector, chromatographic column case, nickel converter, gas flow control system, circuit control detecting system and dedicated online workstation, etc. Features: GC2010D gas chromatograph has ...
