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ASTM D924 Method for Dissipation Factor(Power factor) and Relative Permittivity(
6. Apparatus6.1 Measuring equipment used in these procedures shall be in accordance with Test Methods D150.6.2 Use only a three-terminal cell for these tests.6.3 The design of test cells that conform to the general requirements given in the Annex are considered suitable for use in making these tests.6.4 ...
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ASTM D924 Method for Dissipation Factor(Power factor) and Relative Permittivity(
4. Significance and Use4.1 Dissipation Factor(or Power Factor) - This is a measure of the dielectric losses in an electrical insulating liquid when used in an alternating electric field and of the energy dissipated as heat. A low dissipation factor or power factor indicates low ac dielectric losses. ...
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ASTM D924 Method for Dissipation Factor(Power factor) and Relative Permittivity(
1. Scope1.1 This test method describes testing of new electrical insulating liquids as well as liquids in service or subsequent to service in cables, transformers, oil circuit breakers, andother electrical apparatus.1.2 This test method provides a procedure for making referee tests at a commercial frequency ...
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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
