EPRO PR6423/010-000-CN+CON021 probe sensor

EPRO PR6423/010-000-CN+CON021 probe sensor

All insulating materials used in practice have slightly small dielectric losses at rated voltage and at rated frequency. These losses are fairly low for good insulating materials. This loss changes proportionally with the square of the applied voltage. Insulation, in terms of basic circuits elements, is shown in figure 14.1. The Resistance values R15 , R30, R45 and R60 are taken at 15 s , 30 s, 45 s and 60 s after apply the voltage. Furthermore, the ratio of the insulation resistance R60 to the insulation resistance R15 (or R30 ) is stated as absorption ratio in the test report.

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Insulation angle is dependent on the thickness

the surface and the properties of the insulation material ( the pores, impurities and humidity which cause the ionization in the insulation material ). Generally, the conditions and the reasons will cause a decrease in the dielectric withstand of the insulation. For this reason, the power factor measurement of the insulation at certain frequency gives a basic idea about the insulation. The measurements to be made during the service are one of the most important indications, showing the ageing of the insulation and the contimination of the oil.

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