EPRO MMS3120/022-000 9100-03047-0 sensor

EPRO MMS3120/022-000 9100-03047-0 sensor

The temperature of oil coming in and going out of the cooler is measured by means of thermometers which are fitted to the pipes of the cooler. When the transformer has separate cooler, oil inlet and outlet temperatures are measured on the inlet and outlet pipes near to the transformer tank. If the test object during the test can not be supplied by the current which encounter the total losses of the insufficient power, in this case test losses ( ensuring that not less than the 80 percent of the total losses ) are computed as follows;

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Determination of the temperature rise of the winding 

The transformer under test is continuously supplied by IN rated current after the oil temperature is reached to the equilibrium. This is necessary to adapt the equilibrium between the winding and the oil into the conditions when the transformer is in service. At the end of this time, the circuit is switched off and the winding cooling curve is obtained by the method of winding resistance measurement.When the supply of IN rated current for 1 hour is the second part of the test, the temperature of oil decreases during this time. The relation between the temperature of the winding and the average temperature of the oil shall be calculated with this decreased temperature.

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