C |
capacitance [ F, μF] |
Cmin |
minimim voltage factor ( = 0.95 ) |
f |
frequency [Hz] |
Ia |
current causing operation of device in specified time, A |
In |
nominal current [A] |
IΔn |
rated current of an RCD, A |
L |
inductance [ H, mH] |
R |
resistance [Ω] |
RA |
sum of resistance of earth electrode and protective condcutor, Ω |
ULL , or VLL |
line to line voltage [V, kV] |
ULN or VLN |
line to neutral voltage [V, kV] |
Uo or Vo |
nominal line to neutral voltage [V, kV] |
UN or VN |
nominal line to line voltage [V, kV] |
X |
reactance, general [Ω] |
Xc |
capacitive reactance [Ω] |
XL |
inductive reactance [Ω] |
Z |
impedance [Ω, Ω.m-1] |
Z1 |
line conductor impedance, Ω |
Z2 |
circuit protective conductor (CPC) impedance, Ω |
Ze |
external earth fault impedance, Ω |
Zs |
earth fault look impedance, Ω |
ω |
angular frequency = 2πf, s-1 |