1-6
Factory-Set Logic
Date Code 990430
SEL-351P Manual Técnico
Overcurrent Element
Function with EZ Settings
Operative
Associated Settings
50N2P, 67N2D
67P1
High current lockout - phase
50P1P
67G1, 67N1
High current lockout - ground
50G1P, 50N1P
50P5
Effective min. trip for “Delay curve
- phase” when cold load pickup
scheme is active.
50P5P
50G5, 50N5
Effective min. trip for “Delay curve
- ground” and “SEF element” when
cold load pickup scheme is active.
50G5P, 50N5P
50P6
Threshold (set equal to “Min. trip -
phase”) to detect phase current
returning below the normal “Min.
trip - phase” level when cold load
pickup scheme is active.
50P6P
50G6, 50N6
Threshold (set equal to “Min. trip -
ground”) to detect ground current
returning below the normal “Min.
trip - ground” level when cold load
pickup scheme is active.
50G6P, 50N6P
50N4
Threshold (set equal to “Min. trip -
SEF”) to detect ground current
returning below the normal “Min.
trip - SEF” level when cold load
pickup scheme is active.
50N4P
50A4, 50B4, 50C4
Threshold (set equal to “Min. trip -
phase”) to detect faulted phases for
trip operation counters.
50P4P
The overcurrent elements are available for use in SEL
OGIC
Control Equations as “Relay Word
bits” (see Tables 9.3 and 9.4). The associated overcurrent element settings listed in Table 1.2
and SEL
OGIC
Control Equations settings are found in the settings sheets at the end of
Section 9:
Setting the SEL-351P Recloser Control
. The factory default SEL
OGIC
Control Equations
settings are explained in the remainder of this section.
Residual Ground vs. Neutral Ground
In the following logic explanations, reference is made to residual ground and neutral ground
overcurrent elements. The residual ground overcurrent elements (e.g., 51G1T) are derived from
phase current input channels IA, IB, and IC. The neutral ground overcurrent elements (e.g.,
51N1T) are derived from current input channel IN. If current channel IN is wired residually with
phase current input channels IA, IB, and IC, the residual ground and neutral ground overcurrent
elements see the same magnitude zero-sequence current.
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