Date Code 20081022 Instruction Manual SEL-787 Relay
Appendix K
Analog Quantities
Instructi on Manual
The SEL-787 Transformer Protection Relay contains several analog quantities
that can be used for more than one function.
The actual analog quantities available depend on the part number of the relay
used. 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 are processed
every 500 ms and may not be suitable for fast-response control and protection
applications.
Table K.1 lists analog quantities that can be used in the following specific
functions:
➤ SELOGIC control equations (see Section 4: Protection and
Logic Functions)
➤ Display points (see Section 8: Front-Panel Operations)
➤ Load profile recorder (see Section 5: Metering and Monitoring)
➤ DNP (see Appendix D: DNP3 Communications)
➤ Fast Meter (see Appendix C: SEL Communications Processors)
For a list of analog quantities available for Modbus communications, see
Appendix E: Modbus RTU Communications.
Table K.1 Analog Quantities (Sheet 1 of 6)
Label Description Units
Display
Points
SELOGIC
Load
Profile
DNP
Fast
Meter
Fundamental Instantaneous Metering
IAW1_MAG Winding 1 current, A-phase, magnitude A pri x x x x x
IAW1_ANG Winding 1 current, A-phase, angle degrees x x x x
IBW1_MAG Winding 1 current, B-phase, magnitude A pri x x x x x
IBW1_ANG Winding 1 current, B-phase, angle degrees x x x x
ICW1_MAG Winding 1 current, C-phase, magnitude A pri x x x x x
ICW1_ANG Winding 1 current, C-phase, angle degrees x x x x
IAVW1MAG Winding 1 average current, magnitude A pri x x x x
IGW1_MAG Winding 1 current, calculated-residual,
magnitude
A pri x x x x
IGW1_ANG Winding 1 current, calculated-residual, angle degrees x x x x
3I2W1MAG Winding 1 current, negative-sequence,
magnitude
A pri x x x x
IAW2_MAG Winding 2 current, A-phase, magnitude A pri x x x x x
IAW2_ANG Winding 2 current, A-phase, angle degrees x x x x
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