Page 180 - Practical Power System and Protective Relays Commissioning

IEC 61850 Protocols Used in Protective Relays Communication Chapter | 17 181

TABLE 17.1 (Continued)
SAV Sampled analog value (IEC 61850-9 series)
SCADA Supervisory control and data acquisition
SCD Substation configuration description
SCL Substation configuration language
SCSM Specific communication service mapping
SGCB Setting group control block
SoE Sequence-of-events
SSD System specification description
SUT System under test
SV Sampled values
SVCB Sampled value control block
TCP Transport control protocol
TPAA Two party application association
TUT Tool under test
URCB Unbuffered report control block
USVCB Unicast sampled value control block
UTC Coordinated universal time
VT Voltage transducer
XML eXtensible markup language

information between IEDs produced by different manufacturer. In other
words it is a one common language between the control, protection, and
monitoring devices.

17.2.1 Fundamental Design and Operation

In IEC 61850, functions within substations are termed as follows:
“Station level” refers to the substation as a whole.
“Bay level” refers to the feeder, circuit breaker (CB) or other substation
components.
“Process level” refers to the high-voltage power system or primary equip-
ment and sensors.
This hierarchy is shown in Fig. 17.1.