Size transformers, current transformers and voltage transformers: CT knee-point voltage and saturation to IEC 61869-2, VT burden and voltage factor to IEC 61869-3, transformer kVA sizing, losses and regulation, generator sizing, busbar ratings, and insulation resistance and polarization index tests to IEEE 43.
IEC 61869-2 CT ratio, itemized burden and ALF/knee-point voltage check. Saturation analysis, metering class, thermal/mechanical withstand and multi-ratio taps are advanced features.
IEC 61869-3 voltage transformer ratio, voltage factor by earthing system, and burden vs. standard rated outputs. Protection class, thermal limiting output and open-delta residual voltage are advanced features.
Sizes a new transformer (or N-1 redundant group) from connected load, growth/safety margins, ambient and altitude derating, and standard IEC or ANSI/IEEE kVA ratings.
Genset sizing for running + motor-starting load, and transformer loss/efficiency/regulation from test data. NGR/NET earthing resistor sizing is an advanced feature.
First-principles continuous ampacity and temperature rise for rectangular busbars. Short-time thermal withstand and electrodynamic force check are advanced features.
IEEE 43-2013 minimum insulation resistance by winding type (100 MΩ, 5 MΩ or kV + 1 MΩ), with temperature correction to 40 °C.
PI = IR(10min)/IR(1min) with IEEE 43 condition bands and minimum-PI check by insulation class.
Why CTs and VTs behave like opposite kinds of electrical sources, how a transformer's rating changes with ambient and altitude, and what separates sizing new equipment from assessing the condition of equipment already in service.