Date Code 20170814 Instruction Manual SEL-700G Relay
Appendix K
Inst ruction Manual
Analog Quantities
The SEL-700G 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 used. Analog quantities are typically generated and
used by a primary function, such as, metering. 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 100 ms and may not be suitable for fast-response control and protection
applications. Analog quantities for rms data are determined through the use of
data averaged over the previous 8 cycles.
Table K.1 lists analog quantities that you can use in the following specific
functions:
➤ 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 Meter (see Appendix C: SEL Communications
Processors.)
For a list of analog quantities available for Modbus communications, see
Appendix E: Modbus RTU Communications. For a list of analog quantities
available for IEC61850 communications, refer to the logical nodes
information in Appendix F: IEC 61850 Communications.
NOTE: Quantities that contain X
(e.g., IAX_MAG) refer to the X side;
quantities that contain Y (e.g.,
IAY_MAG) refer to the Y side.
Table K.1 Analog Quantities (Sheet 1 of 9)
Label Description Units
Display
Points
SELOGIC
Load
Profile
DNP
Fast
Meter
Fundamental Instantaneous Metering
IAX_MAG A-phase line current A primary xxxxx
IAX_ANG Angle of the A-phase line current degrees xxxx
IBX_MAG B-phase line current A primary xxxxx
IBX_ANG Angle of the B-phase line current degrees xxxx
ICX_MAG C-phase line current A primary xxxxx
ICX_ANG Angle of the C-phase line current degrees xxxx
IGX_MAG Calculated-residual current A primary xxxx
IGX_ANG Angle of the calculated-residual current degrees xxxx
I1X_MAG Positive-sequence current A primary xxxx
I1X_ANG Angle of the positive-sequence current degrees xxxx
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