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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
Содержание VAMP 59
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