Date Code 990215
Factory-Set Logic
1-13
SEL-351P Manual Técnico
•
See Figure SECTION 1: .3 (bottom). If setting Min. trip-ground is set below 0.1 Amp
secondary, 50N6 provides the indication that cold load pickup ground current is above
the normal Min. trip-ground setting value (50G6 is turned off automatically).
Otherwise, 50G6 provides the indication (50N6 is turned off automatically).
•
See Figure SECTION 1: .3 and Figure SECTION 1: .4. The Cold load pickup-ground
setting enables the cold load pickup scheme for both the ground and SEF elements
(Relay Word bit CLG = logical 1). Ground and SEF elements both see the same zero-
sequence current.
F
AST
C
URVE
O
PERATION
L
OGIC
Note the symmetry between Figure SECTION 1: .6 and Figure SECTION 1: .7. Relay Word
bits SH0 through SH4 assert during different periods of a reclose cycle as the shot (reclose)
counter increments. The shot counter increments just before each reclose. See also Figure 6.6
and Table 6.3.
Table SECTION 1: .3: Conditions for Assertion of Relay Word bits SH0 through SH4
Relay Word bit
Asserted to logical 1 from:
SH0
reset state to just before 1st reclose
SH1
just before 1st reclose to just before 2nd reclose
SH2
just before 2nd reclose to just before 3rd
reclose
SH3
just before 3rd reclose to just before 4th reclose
SH4
just before 4th reclose, and following (through lockout state)
Note:
The above table presumes that five trip operations are set (four reclosures in between
them). If the SEL-351P is set for fewer trip operations, the shot counter does not
increment to the higher shots (e.g., the shot counter doesn’t increment to shot = 4 if only
four trip operations are set). Thus, the corresponding higher shot bits (e.g., SH4) never
assert for lesser numbers of trip operations.
An example reclose cycle (from reset to lockout) appears as:
(reset) 1st trip - 1st reclose - 2nd trip - 2nd reclose - 3rd trip - 3rd reclose - 4th trip (lockout)
Per Table SECTION 1: .3, SH0 = logical 1 during the first trip, SH1 = logical 1 during the
second trip, and so forth.
Refer to Figure SECTION 1: .6. For example, to enable Fast curve-phase for the first and
second trip operations, make EZ setting Operations-phase fast curve = 2 (OPGR = 2). This
causes Relay Word bit OCG to assert to logical 1 for both the following conditions:
•
shot = 0 (SH0 = logical 1)
•
shot = 1 (SH1 = logical 1)
Содержание SEL-351P
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