Technical Guide P92x/EN FT/E11
User Guide
MiCOM P921-P922-P923 Page 5/110
1. PRELIMINARY DEFINITIONS
In this manual, all the following definitions and notations will be used :
Vr Residual voltage = 3 x zero sequence voltage
V0 Zero sequence voltage
V1, V2 Positive and negative sequence voltages
VA, VB, VC Phase voltages
VAB, VBC, VCA Line voltages
Vn Rated voltage
VT Voltage transformer
DMT Definite minimum time
IDMT Inverse definite minimum time
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