Rockwell Automation 865 Differential Protection Relay User Manual
Page 182
11-2 Abbreviations
and
Symbols
865-UM001A-EN-P – July 2009
LAN
Local area network. Ethernet based network for computers and
relays.
Latching
Output relays and indication LEDs can be latched, which means that
they are not released when the control signal is releasing. Releasing
of lathed devices is done with a separate action.
NTP
Network time protocol for LAN and WWW
pu
Per unit. Depending of the context the per unit refers to any nominal
value. For example for overcurrent setting 1 pu = 1xI
GN
.
RMS
Root mean square
SNTP
Simple Network Time Protocol for LAN and WWW
TCS
Trip circuit supervision
THD
Total harmonic distortion
UTC
Coordinated Universal Time (used to be called GMT = Greenwich
Mean Time)
WWW
World wide web
≈ internet
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