G-2 Setting SEL
OGIC
®
Control Equations Date Code 990430
SEL-351P Manual Técnico
If the maximum phase current is above the level of the phase time-overcurrent pickup setting
51P1P, Relay Word bit 51P is in the following state:
51P1 = 1 (logical 1)
If the maximum phase current is above
the level of the phase time-overcurrent pickup setting
51P1P, phase time-overcurrent element 51P1T is either timing on its curve or is already timed
out.
Phase Time-Overcurrent Element 51P1T Time-Out Indication
If phase time-overcurrent element 51P1T is not timed out on its curve, Relay Word bit 51P1T is
in the following state:
51P1T = 0 (logical 0)
If phase time-overcurrent element 51P1T is timed out
on its curve, Relay Word bit 51P1T is in
the following state:
51P1T = 1 (logical 1)
Phase Time-Overcurrent Element 51P1T Reset Indication
If phase time-overcurrent element 51P1T is not fully reset, Relay Word bit 51P1R is in the
following state:
51P1R = 0 (logical 0)
If phase time-overcurrent element is fully reset
, Relay Word bit 51P1R is in the following state:
51P1R = 1 (logical 1)
If phase time-overcurrent element 51P1T is not fully reset
, the element is either:
• Timing on its curve
• Already timed out
• Is timing to reset (one-cycle reset or electromechanical emulation – see
setting 51P1RS)
Relay Word Bit Application Examples – Phase Time-Overcurrent Element 51P1T
Common uses for Relay Word bits 51P1, 51P1T, and 51P1R:
51P1 testing (e.g., assign to an output contact for pickup testing)
trip unlatch logic (see SEL
OGIC Control Equation unlatch trip setting ULTR
example later in this section)
51P1T trip logic (see SEL
OGIC Control Equation trip setting TR example later in this
section)
51P1R used in testing (e.g., assign to an output contact for reset indication)
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