Abbreviations Index of Instrument Transformers(IT)


IT

Instrument Transformer

CT

Current Transformer

CVT

Capacitive Voltage Transformer

VT

Voltage Transformer

AIS

Air-insulated Switchgear

GIS

Gas-Insulated Switchgear

K

actual transformation ratio

kr

rated transformation ratio

ε

ratio error

φ

phase displacement

Sr

rated output

Usys

highest voltage for system

Um

highest voltage for equipment

fR

rated frequency

F

mechanical load

Frel

relative leakage rate