Calculations

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Calculations

Transformer calculations

We carry out detail calculations of each transformer which we design or check.

The calculations can be split on the next groups.

Calculation of windings impedance;
Calculation of I2R, circulating and eddy losses in windings;
Core loss calculation;
Calculation of short circuit currents at different modes and different tap positions with taking into account zero sequence impedance value;
Calculation of stray losses in structural parts of a transformer as Frames, Flitch plates, in Last packets of a core and in a Tank;
Noise level calculation.

Calculation of impulse stresses and safety margins between all disks of all windings at Lighting Impulse and Chopped Impulse tests;
Turn insulation calculation;
Major insulation calculation: Calculation of safety margins between winding and grounding parts of a transformer, between leads and grounding parts of a transformer or between bushing and grounding parts of a transformer;
Calculation of creepage stress along insulation details attached to the high voltage windings;

Winding thermal calculation: calculation of winding gradients and temperature rises and location of hot spots;
Core thermal calculation;
Thermal calculation of cooling system;
Thermal calculation of structural parts, last packets, tank due to stray losses;
Hydraulic calculation.

Calculation of electrodynamic stability of the windings at short circuit and pressing modes;
Mechanical calculation of the pressing ring at short circuit and pressing modes;
Mechanical calculation of the top and bottom yoke beams at short circuit and pressing modes;
Mechanical calculation of the tank at vacuum, transportation, lifting modes;
Seismic calculation.

Transformer Design & Technology