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Factors that affect the breakdown voltage of insulating liquids
The dielectric breakdown voltage of a liquid at power frequencies is affected by the following:1. Water content of the oil,2. The temperature of the liquid as it affects the relative saturation level of moisture in solution,3. The degree of uniformity of the electric field,4. The area of the electrodes,5. ...
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ASTM D877 Method for dielectric breakdown voltage of insulating liquids
9. Test Temperature9.1 Make the temperature of the test specimen about the same as the test cup, then equilibrate the specimen and test cup temperature by rinsing the cup with part of the sample and filling the cup with the specimen within 15s of rinsing the cup. Record the temperature of the sample ...
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ASTM D877 Method for dielectric breakdown voltage of insulating liquids
8. Sampling8.1 Obtain a sample of the liquid to be tested in accordance with Test Method D923. Record on the label of the sample container identification of the device from which the sample was obtained, the date, and temperature of the sample at the time of collection. Prior to starting the test, the ...
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ASTM D877 Method for dielectric breakdown voltage of insulating liquids
7. Adjustment and Care of Electrodes and Test Cup7.1 Daily Use - At the beginning of each day's testing examine the electrodes for scratches, pitting, and contamination. If pitting or scratches of the disk faces are found, examine the electrodes in accordance with 7.4 for the proper sharp edge and then ...
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ASTM D877 Method for dielectric breakdown voltage of insulating liquids
4. Electrical Apparatus4.1 In addition to this section, use IEEE Standard 4 to determine other requirements necessary for conducting test methods and making measurements using alternating voltages. Procedures to ensure accuracy should follow the requirements of IEEE Standard 4. Calibration(s) shall be ...
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ASTM D877 Method for dielectric breakdown voltage of insulating liquids
1. Scope1.1 This test method describes two procedures, A and B,for determining the electrical breakdown voltage of insulating liquid specimens. The breakdown test uses ac voltage in the power-frequency range from 45 to 65Hz.1.2 This test method is used to judge if the disk electrode breakdown voltage ...
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Dielectric breakdown voltage value specified in IEC 60156
New Oil In New Equipment After Filling ButPrior To Energizing Minimum Dielectric Breakdown Voltage ValuesUsing IEC 60156 In-service Dielectric Breakdown VoltageValues For Mineral Oil-filled Transformers Using IEC60156
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BS-EN-61198 Methods for the determination of 2-furfural and related compounds
Checking extraction and recoveryMethod B assumes complete retention of the analytes by the silica cartridge and complete recovery upon elution with HPLC eluent.It is, however, good practice to evaluate the performance of the cartridges from batch to batch and the performance of the method with strongly ...
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BS-EN-61198 Methods for the determination of 2-furfural and related compounds
13 Minimum level of detection Following the methods described in clause 9, the minimum concentraion of the five analytes which can be determined in unused mineral oil shall be 0.05mg/kg or lower. In considerably oxidized samples the presence of polar compounds having similar retention times to the analytes ...
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BS-EN-61198 Methods for the determination of 2-furfural and related compounds
10 Calibration Standard solutions in oil are required to calibrate analyses of extracts obtained from method A. Standard solutions either in oil or in chromatographic eluent may be used with extracts prepared in accordance with method B. 10.1 Standard solutions in oil 10.1.1 Preparation of stock solution ...
