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How do I know if my fluid has passed BDV test?
How do I know if my fluid has passed BDV test?The manufacturer of the insulating fluid normally quotes typical breakdown values for both new and in-service fluid in its data sheets. In addition, the test standards refer to oil condition standards that provide guidance about the acceptability of results.USA ...
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How do I know whether my BDV test results are valid?
How do I know whether my BDV test results are valid?This extract from the chart comparing standards, which was included in full earlier in this application note, shows that each standard specifies different conditions that must be met if the results of a test are to be accepted as valid.(1) Mean is the ...
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Why measure oil sample temperature in insulating oil BDV testing?
Why measure oil sample temperature in insulating oil BDV testing?The breakdown voltage of an oil sample increases significantly with temperature. For example, a natural ester sample with a breakdown voltage of around 35 kV at 30℃ could easily have a breakdown voltage of nearly 60 kV at 70℃. For this ...
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Preparing the test vessel for BDV testing
Preparing the test vessel for BDV testingSuccessful dielectric breakdown voltage testing depends not only on obtaining a good sample, as discussed in the previous section, but also on ensuring that the test vessel is properly prepared. The preparation of the test vessel can be divided into two key elements ...
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Hints and tips for taking oil samples for BDV testing
Hints and tips for taking oil samples for BDV testingFor a sample to be truly useful, it must be representative of the oil in the equipment. This means that cleanliness is extremely important.(1) Samples are normally drawn from a drain valve or sampling cock. This must be cleaned both inside and out ...
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How should an oil sample be taken to dielectric strength testing?
How should an oil sample be taken to dielectric strength testing?Two things are particularly important when taking oil samples. The first is to ensure that the proper sampling procedure is followed, and the second is to ensure that all of the essential information is properly recorded.If the sample is ...
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IEC standard (International) for insulating oil dielectric breakdown voltage tes
IEC standard (International) for insulating oil dielectric breakdown voltage testingThe International Electrotechnical Commission (IEC) defines only one method for oil breakdown dielectric voltage testing. This is IEC 60156 Insulating Liquids - Determination of the Breakdown Voltage at Power Frequencies ...
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ASTM standard (USA) for insulating oil dielectric breakdown voltage testing
ASTM standard (USA) for insulating oil dielectric breakdown voltage testingThere are two standard test methods from ASTM International. The first is ASTM D877-02 (latest edition 2002) - Standard Test Method for Dielectric Breakdown Voltage of Insulating Liquids Using Disk Electrodes. The second is ASTM ...
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What are the test standards for insulating oil dielectric breakdown voltage test
What are the test standards for insulating oil dielectric breakdown voltage testing?There are many test standards for insulating liquids, but they are derivatives of three main standards. Two of these are from ASTM International (USA) and the other is from the IEC (Europe). These main standards are:(1) ...
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How often is insulating oil dielectric breakdown voltage testing performed?
How often is insulating oil dielectric breakdown voltage testing performed?Dielectric breakdown voltage testing is an important element in the maintenance programme of any item of oil-insulated electrical equipment. However, to get the maximum benefit from this type of testing, it is strongly recommends ...
