Engineering category
Protection & Safety
Protection equipment, earthing and electrical safety.
Calculators in this category
Each tool has its own dedicated page.
Insulation Resistance PI/DAR
Polarization index and dielectric absorption ratio.
View calculator →CT & VT Sizing
Instrument-transformer ratios and burden screening, CT and VT tabs.
View calculator →MV Transformer Protection Settings (50/51/50N/51N)
Reference pickups in ABB REF615 format; reference only, not for commissioning.
View calculator →