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PT ratio
Potential transformer or voltage transformer ratio
PUTT
Permissive underreach transfer trip
RCA
Relay characteristic angle
RISC
Reduced instruction set computer
RMS value
Root mean square value
RS422
A balanced serial interface for the transmission of digital data in
point-to-point connections
RS485
Serial link according to EIA standard RS485
RTC
Real-time clock
RTU
Remote terminal unit
SA
Substation Automation
SBO
Select-before-operate
SC
Switch or push button to close
SCL
Short circuit location
SCS
Station control system
SCADA
Supervision, control and data acquisition
SCT
System configuration tool according to standard IEC 61850
SDU
Service data unit
SMA connector
Subminiature version A, A threaded connector with constant
impedance.
SMT
Signal matrix tool within PCM600
SMS
Station monitoring system
SNTP
Simple network time protocol – is used to synchronize computer
clocks on local area networks. This reduces the requirement to
have accurate hardware clocks in every embedded system in a
network. Each embedded node can instead synchronize with a
remote clock, providing the required accuracy.
SOF
Status of fault
SPA
Strömberg protection acquisition, a serial master/slave protocol
for point-to-point communication
SRY
Switch for CB ready condition
ST
Switch or push button to trip
Starpoint
Neutral/Wye point of transformer or generator
SVC
Static VAr compensation
Section 22
1MRK 502 048-UUS A
Glossary
768
Technical manual
Содержание 650 series
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