EPRO PR6423/003-030-CN Vibration card
The purpose of the measurement is to determine the leakage current of the insulation resistance. This current is changing with the moisture, impurity contents and temperature of the insulation. Beside the result of the measurements, the comparison of the periodical measurement give the information about the condition of the insulation. In order to compare they must be at the same temperature ( for example at 20°C reference temperature ).
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“Time resistance method”
in the insulation resistance measurement is one of the best methods, that is simple and gives correct results. The insulation resistance is measured by means of an insulation resistance meter which apply a voltage 1000 V dc or 5000 V dc. Each winding is measured separately by connecting the voltage between the winding to be tested and earth. While the other windings are connected to the guard circuit of the test instrument. The temperature and humidity are recorded during the test.
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