EPRO MMS6823R/9100-00001-06 Ethernet interface module

EPRO MMS6823R/9100-00001-06 Ethernet interface module

The maximum temperature occuring in any part of the winding insulation system is called the “hot-spot temperature”. This parameter represent the thermal limitation of loading of the transformer.When the transformer is supplied with total losses in the first part of the test, there is no need to make any correction if the test frequency is different than the rated frequency, but for the loading with rated current for one hour in the second part of the test, the correction must be made in accordance with the below equation;

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MEASUREMENT OF ZERO-SEQUENCE IMPEDANCE 

The zero-sequence impedance is usually measured for all star or zig-zag -connected windings of the transformer. The measurement is carried out by supplying with rated frequency between the parallel connected phase terminals and the neutral terminal. The zero-sequence impedance per phase is three times the impedance measured in this way.Zero-sequence impedance is related with connection group and manufacturing properties. Zerosequence impedance consists of two parts as Ro ( real ) and Xo ( imaginary ), due to Ro<< Xo, Ro can be neglected. This yields the zero sequence impedance equals to zero-sequence reactance.

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