Rockwell Automation 865 Differential Protection Relay - 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