VAMP 59 - Page 205

Technical description
10 Abbreviations and symbols
VM59.EN001
VAMP 24h support phone +358 (0)20 753 3264
205
pu
Per unit. Depending of the context the per unit refers to any
nominal value. For example for overcurrent setting 1 pu =
1xI
MODE
.
Q
Reactive power. Unit = [var] acc. IEC
RMS
Root mean square
S
Apparent power. Unit = [VA]
SNTP
Simple Network Time Protocol for LAN and WWW
TCS
Trip circuit supervision
THD
Total harmonic distortion
U
0SEC
Voltage at input U
C
at zero ohm earth fault. (Used in voltage
measurement mode "2LL+Uo")
U
A
Voltage input for U
12
or U
L1
depending of the voltage
measurement mode
U
B
Voltage input for U
23
or U
L2
depending of the voltage
measurement mode
U
C
Voltage input for U
31
or U
0
depending of the voltage
measurement mode
U
N
Nominal voltage. Rating of VT primary or secondary
UTC
Coordinated Universal Time (used to be called GMT =
Greenwich Mean Time)
VT
Voltage transformer i.e. potential transformer PT
VT
PRI
Nominal primary value of voltage transformer
VT
SEC
Nominal secondary value of voltage transformer
WWW
World wide web  internet