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Transformer oil dissolved gas analysis
Transformer oil dissolved gas analysis is a useful, predictive and effective way for evaluating transformer health. The breakdown of electrical insulating material and related components inside a transformer generates gases within the transformer. Therefore, the identity of these gases being generated ...
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Heart-cut technology of gas chromatograph
The full separation and determination of specific compounds could be difficult in some samples which contain many compounds. In this situation, heart-cut technology is applied to separate and determine specific compounds by using two chromatographic columns with different separation characteristics.
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Principle of gas chromatography
The sample is injected into the gas chromatograph, enters a gas stream which will transport the sample into a separation tube which known as Column. Usually, an inert gas such as helium or an unreactive gas such as nitrogen is used as a carrier gas. Various components are separated inside the column. ...
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What is gas chromatograph?
A gas chromatograph (GC) is an analytical instrument for analyzing composition and concentration of compound of a sample. The analysis performed by a gas chromatograph called gas chromatography.
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Why is it important to have purified oil in a transformer?
1. Gas in transformer oil can cause arcing, corona discharge, overheating and even explosion. It degrades the quality of transformer oil and reduces the reliability and lifetime of the transformer. There are two types of gas in transformer oil. One is gas bubble which can be seen by naked eye, the other ...
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What is ASTM D445?
It is an ASTM International Standard Test Method for the analysis of viscosity in lubricant oil. Its full title is ASTM D445 Standard Test Method for kinematic viscosity of Transparent and Opaque Liquids (and Calculation of Dynamic Viscosity). For complete information of ASTM D445, please visit ASTM ...
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Total Acid Number(TAN)
Total Acid Number(TAN) is a parameter to define the deterioration of lubricants. The more acidity lubricant oil contains, the worse quality lubricant oil is. In other words, the lubricant oil is degraded. In addition, once the lubricant oil has a large amount of acid number, it will be harm to equipment ...
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5 basic tests performed on lubricant oil
Usually there are 5 basic test items are performed on lubricant oil: 1. Kinematic viscosity test 2. flash point test 3. Moisture test 4. Acidity test 5. Mechanical impurity test If it is low temperature, pour point test is also under consideration.
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The role of gas chromatography in compositional analyses in the petroleum indust
Because of the complex character of petroleum fractions and products, gas chromatography plays an important role as an analytical technique in this area. For the majority of oil fractions classifying or group-type analyses are performed rather than determinations of all the individual constituents. The ...
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Breakdown Voltage
Breakdown voltage is a very important factor to transformer oil. Take oil sample from transformer, and put it into the tester. The gap between both electrodes should be 2.5mm. Then, heating, the voltage should be gradually increased. At one value there is a flash takes place, and this value is termed ...
