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Physicochemical Constants of Furfural(furaldehyde)
GB No.: 33581CAS No.: 98-01-1Formula: C5H4O2, C4H3OCHOAppearance and properties: Colorless to yellow liquid, with almond-like odorMolecular weight: 96.09Vapor pressure: 0.33kPa/25℃Flash point: 60℃Refractive index: 1.5263Melting point: -36.5℃Boiling point: 161.1℃Solubility: Slightly soluble in ...
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The Furan Analysis Process
Furan analysis shows the condition of the paper insulation with an oil sample. Over time, the cellulose insulating material will experience degradation. An aromatic compound is produced during this degradation called furan. Testing is performed for five furans: • 5H2F (5-hydroxymethl – 2-furaldehyde) ...
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Evaluation of Transformer Solid Insulation
Direct EvaluationThe mechanical properties of insulating paper can be established by direct measurement of its tensile strength or degree of polymerization(DP). These properties are used to evaluate the end of reliable life or paper insulation. It is generally suggested that DP values of 150 - 250 represent ...
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What is Karl Fischer reagent?
Karl Fischer reagent is a mixture of dehydrated methanol, iodine, sulphur dioxide and pyridine. Nowadays, due to extremely toxic behaviour of pyridine, it is usuallly replaced byamines.
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Transformer Oil Recycling Equipment
Double-stage transformer oil purifier is designed to recycle transformer oil, cable oil, switch oil and other insulation oil in power stations, power sub-stations and manufacturing enterprises etc., and particularly in 110KV power distribution system and grid. It can remove water, gas and impurity from ...
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Transformer Oil Recycling Machine
Single-stage transformer oil purifier is designed to recycle transformer oil, cable oil, switch oil and other insulating oils in power stations, power sub-stations and manufacturing enterprises etc. It can remove water, gas and impurity from the oil quickly and efficiently. After treatment, the oil becomes ...
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Code list of faults detected by DGA
IEC Publication 60599 provides a coded list of faults detected by dissolved gas analysis (DGA) as follows:PD = partial dischargesD1 = discharges of low energyD2 = discharges of high energyT1 = thermal faults of temperature < 300℃T2 = thermal faults of temperature 300℃ < T < 700℃T3 = thermal ...
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Application Period - Dissolved Gas Analysis (DGA) of Mineral Oil Used in Transfo
In a new transformer, typical hydrocarbon gases concentration for good new oil after vacuum filtration would be within 5ppm. DGA shall be repeated once a month after commissioning and then at increasing intervals as found necessary. In an overhauled and repaired transformer, the transformer should be ...
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Normal Values of Dissolved Gas - Dissolved Gas Analysis (DGA) of Mineral Oil Use
The mineral oil will contain normal values of dissolved gas which will indicate no incipient fault in the transformer. The following figures show the normal values of dissolved gases in the oil. When the DGA results of all the 7 key gases are less than the values of figure, it can be concluded there ...
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Classification of Fault - Dissolved Gas Analysis (DGA) of Mineral Oil Used in Tr
There are several basic types of faults, which can occur in the transformer:Arcing or high current break down.Low energy sparking or partial discharges.Localized overheating or hot spots and general overheating due to inadequate cooling or sustained overloading.Each of the faults results in thermal degradation ...
