EPRO PR9376/20 Bus expansion module

EPRO PR9376/20 Bus expansion module

Since, it is necessary to record the temperature rises and the ambient temperature through the test, thermometers are placed in a thermometer pocket in the cover, in and going out of the cooler and 1 to 2 meter away from the transformers. The temperatures in these thermometers are measured and recorded when the transformer is in cold position before starting the test. Before starting the test, the winding temperature ( cold resistance measurement ) is measured and recorded.

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The transformer is supplied with a voltage 

and current which constitutes the sum of short-circuit losses at the maximum loss tap and no-load losses in order to achieve to the service conditions. For a multiwinding transformer, the temperature rise requirement refer to rated power in all windings simultaneously if the rated power of one winding is equal to the sum of the rated powers of other windings. In certain cases, if it suits, first part of the test can be a few hours shortened by switching of the cooling system. The maximum values of the current and the voltage during the supply are as follows;

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