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Procedure of Measuring Dielectric Dissipation Factor
The details of the entire procedure are given in the ASTM D924 standard and are only briefly mentioned here. The measurements are made in specially designed cells that are machined to precise dimensions. The measurements are done at precise temperature, usually 25℃ and 100℃, thus the cells have to ...
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Significance of Dielectric Dissipation Factor
The dielectric loss factor relates to the inability of molecules in the insulating fluids to reorient themselves with an alternating electric field. This ability is dependent on the temperature of the sample, the size of the molecules involved, and their polarity. It is also dependent on the frequency ...
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Dielectric dissipation factor of transformer oil
Loss angle is an important property of transformer oil. In ideal dielectric material, the phase anlge between the voltage and current is 90. However, due to impurities, certain leakage current flows through the dielectric, the actual phase anlge is slightly less than 90. Becasue an angle is very low, ...
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How much is permitted water content in oil?
Setting an alarm level for water in oil is very important for equipment reliability. Establishment of levels, combined with testing at proper intervals, will allow the end user to act quickly if a sudden increment of water is detected. Best practice is to maintain water levels at or below half of the ...
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How is water in oil measured?
Water in oil can be measured in 3 ways: on-site by sampling, in the laboratory and on-line in real time.1. On-site measurement1.1 Crackle Test is the most expedient and economical way to determine water content in oil. Two drops of oil are placed on a hot surface (130℃) and any bubbling or crackling ...
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What type of damage can water do to lubrication system?
The effect of water in oil is twofold, destrolying both the beneficial physical and chemical properties and characteristics of the oil. This can lead to machine component damage.1. Physical effect on oila. Higher viscosityb. Reduced load carrying ability2. Chemical effect on oila. Hydrolysis - formation ...
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How does water exist in oil?
Water in oil can exist in three stages: dissolved, emulsified and free. Below saturation level, the molecules of water are dispersed alongside oil molecules, resulting in water in the oil that is not visible. This is known as dissolved water, the least dangerous water state to a lubrication system.When ...
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Where does water come from in lubrication system?
Water in lubrication systems can originate from the environment, such as rain or moisture in the air. Leakage, damaged gasket on reservoir covers, underperforming air breathers, or a damaged wiper on a hydraulic cylinder are also possible sources. Condensation of air in oil reservoirs due to temperature ...
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How to choose a gas chromatograph 4 --- Other Aspects
1. For one sample, in theory, there are probabaly several analytical methods by various instruments. So you'd better compare their performance-price ratio, operational characteristics, maintenance service. List the reasons why you choose this supplier's GC. 2. Find and consult reference documents regarding ...
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How to choose a gas chromatograph 3 --- Positioning of Purchaser
1. Research institute: high requirements on GC. 2. Monitoring and analysis center: emphasize accuracy and reliability of measurement. 3. Working site front-line analysis: focus on repeatability.
