Schweitzer Engineering SEL-351P, Quick Start Manual

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Date Code 990430 Setting SEL
OGIC
®
Control Equations G-11
SEL-351P Manual Técnico
After SEL
OGIC
Control Equations settings changes have been made and the settings are saved,
the SEL-351P responds with the following message:
xxx Elements remain available
indicating that “xxx” Relay Word bits can still be used for the particular setting group.
P
ROCESSING
O
RDER AND
P
ROCESSING
I
NTERVAL
The relay elements and logic (and corresponding SEL
OGIC
Control Equation settings and
resultant Relay Word bits) are processed in the order shown in Table APPENDIX G: .2 (top to
bottom). They are processed every quarter-cycle (1/4-cycle), and the Relay Word bit states
(logical 1 or logical 0) are updated with each quarter-cycle pass. Thus, the relay processing
interval is 1/4-cycle. Once a Relay Word bit is asserted, it retains the state (logical 1 or logical 0)
until it is updated again in the next processing interval.
Table APPENDIX G: .2: Processing Order of Relay Elements and Logic (top to bottom)
Relay Elements and Logic
(corresponding SEL
OGIC
Control
Equations listed in parentheses) Resultant Relay Word Bits
Reference
Instruction
Manual
Section
Optoisolated Inputs IN101 - IN106 Section 7
Polarizing Voltage VPOLV Section 4
Receive M
IRRORED
B
ITS
™ RMB1A. . .RMB8A,
RMB1B. . .RMB8B Appendix I
Miscellaneous Instantaneous
Overcurrent Elements 50A1 - 50A4, 50B1 - 50B4,
50C1 - 50C4, 50A, 50B, 50C,
50AB1 - 50AB4, 50BC1 - 50BC4,
50CA1 - 50CA4, 50QF, 50QR,
50GF, 50GR, 50L Section 3
Demand Ammeters PDEM, NDEM, GDEM, QDEM Section 8
Open Breaker Logic (52A) 3PO Section 5
Loss-of-Potential LOP, ILOP Section 4
Load Encroachment ZLOUT, ZLIN, ZLOAD Section 4
Local Control Switches LB1 - LB8 Section 7
Remote Control Switches RB1 - RB8 Section 7
Latch Control Switches
(SET1 - SET8, RST1 - RST8) LT1 - LT8 Section 7