Date Code 20170927 Instruction Manual SEL-751 Relay
Appendix L
Analog Quantities
The SEL-751 Feeder Protection Relay contains several analog quantities that
you can use for more than one function. The actual analog quantities available
depend on the part number of the relay you use. Analog quantities are
typically generated and used by a primary function, such as metering, and
selected quantities are made available for one or more supplemental functions,
for example, the load profile.
Note that all analog quantities available for use in SEL
OGIC control equations
are processed every 25 ms and may not be suitable for fast-response control
and protection applications.
Table L.1 lists analog quantities that you can use in the following specific
functions (indicated with an x):
➤ Display points (see Section 8: Front-Panel Operations)
➤ SELOGIC control equations (see Section 4: Protection and
Logic Functions)
➤ Load profile recorder (see Section 5: Metering and Monitoring)
➤ DNP (see Appendix D: DNP3 Communications)
➤ Fast Message Read
➤ IEC 60870-5-103 (see Appendix G: IEC 60870-5-103
Communications)
➤ Modbus (see Appendix E: Modbus RTU Communications)
➤ Fast Meter (see Appendix C: SEL Communications Processors)
➤ IEC 61850 (see Appendix F: IEC 61850 Communications)
Table L.1 Analog Quantities (Sheet 1 of 8)
Name Description Units
Display Points
SELOGIC
Load Profile
DNP3/Fast Message Read/
IEC 60870-5-103
Modbus
Fas t Meter
IEC 61850
Fundamental Instantaneous Metering
IA_MAG A-phase line current A pri xxxx xx x
IA_ANG Angle of the A-phase line current degrees xxxx x x
IB_MAG B-phase line current A pri xxxx xx x
IB_ANG Angle of the B-phase line current degrees xxxx x x
IC_MAG C-phase line current A pri xxxx xx x
IC_ANG Angle of the C-phase line current degrees xxxx x x
IN_MAG Neutral current A pri xxxx xx x
To Next Page
Loading...
