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Functions of oil in transformer
Primary function of oil is insulation. It provides the electrical insulation for parts of transformer. It insulates the windings from each other and from the core. The windings and core are separated by paper which is soaked by the oil. The advantage of oil insulation is that it heals up if it breaks ...
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Du Noüy Ring for Liquid/Gas and Liquid/Liquid interfaces
The universally accepted technique for measuring interfacial tension is by the Du Noüy ring which is a precise geometry made of Pt-Ir. International standards for both the liquid/gas and liquid/liquid interface, from a range of industries, for example, electrical insulation and electronics, water and ...
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What is interfacial tension?
Interfacial Tension is a measurement of the cohesive (excess) energy present at an interface arising from the imbalance of forces between molecules at an interface (gas/liquid, liquid/liquid, gas/solid, liquid/solid). When two different phases (gas/liquid, liquid/liquid, gas/solid or liquid/solid) are ...
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Typical chromatogram of furan derivative analysis by HPLC
HPLC is a form of column chromatography. It utilizes a column that holds chromatographic packing material (stationary phase), a pump that moves the mobile phase through the column, and a detector that shows the retention times of the molecules. Components to be analyzed are first dissolved in a solvent, ...
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Furanic compounds in transformer oil
Furfural analysis is gaining popularity in the recent trend of transformer insulation strength assessment, transformer remnant life estimation or related research field. This is due to its direct connection with the solid insulation strength in the power transformer system. ASTM D5837 is the widely used ...
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Diagnostic Techniques in Power Transformer Insulation
A power transformer insulation system consists of solid (paper) and liquid (insulating oil) insulation. Their insulation strength degrades over a period of time depending on transformer loading and the surrounding environment condition. The characteristics of by-product generation and changes in properties ...
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Deterioration Mechanisms in Transformer Insulation
Liquid insulation is a type of mineral oil made by refining a fraction of the hydrocarbons collected during the distillation of a petroleum crude stock. The basic requirement of this mineral oil has to be in agreements with standard specifications developed by groups of experts such as ASTM Standard ...
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Power transformer insulation strength assessment
Current practicing engineers use a number of modern diagnostic techniques to assess the insulation condition of aged transformers. These techniques are categorized into electrical and chemical analysis. Electrical analysis such as: Partial discharge (PD) analysis Dielectric breakdown voltage measurement ...
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Power transformer failures
The reliability and continuous performance of the power transformer is one of the vital key to profitable power generation and transmission. However, due to the practice of minimizing the capital expenditures of electrical power system, it is very common to operate these equipments close to the limits ...
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Power Transformer
Large oil-filled electrical power equipment is a critical element in an electrical power system. Power transformer is utilized to raise or lower the voltage level as needed to serve the transmission or distributino networks. Through the use of device such as the transformer, AC electric power is generated ...
