Schweitzer Engineering SEL-351P, Quick Start Manual

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Settings
SEL-351P Quick-Start Installation and User's Guide (Portuguese) 51
Setting Default Range Incr.
Vert. multiplier - ground
delay curve 1.00 0.10 - 2.00 0.01
The Vert. multiplier - ground delay curve setting shifts the phase delay curve in time, by the entered
multiplier, if Delay curve - ground (No. 11) is programmed with a recloser or user curve. If no
particular multiplier is desired, set Vert. multiplier - ground delay curve equal to 1.00.
•
If Delay curve - ground (No. 11) is programmed with a US (U1-U5) or IEC (C1-C5) curve,
Vert. multiplier - ground delay curve is hidden and nonoperative. The preceding Time-dial -
ground delay curve (No. 11) - setting provides the US and IEC curves with an effective vertical
multiplier, instead.
•
This setting has no multiplying effect on the Constant time adder - ground delay curve and
Min. response time - ground delay curve settings. They all operate independently.
•
This setting is hidden and set to 1.00 if Complex delay curve - ground is set to N and Delay
curve - ground (No. 11) is programmed with a recloser or user curve.
Setting Default Range Incr.
Min. response - ground
delay curve 0.00 0-60.00 cycles 0.25 cyc.
The ground delay curve can trip no faster than the Min. response time - ground delay curve setting.
If the Min. response time - ground delay curve setting is set equal to zero (0), it has no effect on
the ground delay curve. If the Min. response time - ground delay curve setting is set equal to
15 cycles, for example, the ground delay curve cannot trip on the portion of the curve that is faster than
15 cycles - the ground delay curve effectively flattens out at 15 cycles.
•
This setting is hidden and set to zero (0) if Complex delay curve - ground is set to N.
No. Setting Default Range Incr.
29 High current trip - phase N Y/N
The High current trip - phase setting enables the following three settings for phase high current tripping, if
set to Y. Phase high current tripping is not affected by the cold load pickup scheme.
•
This setting is hidden and set to N if Fast curve - phase (No. 8) and Delay curve - phase (No. 10) are
both set to OFF.
Setting Default Range Incr.
High current trip - phase OFF OFF, 1.00-19.99 multiples of Min.
trip - phase 0.01
The High current trip - phase (multiples of Min. trip - phase ) setting determines the phase current
threshold for phase high current tripping.
Example: If High current trip - phase = 12.00 (multiples of Min. trip - phase ) and Min. trip -
phase (No. 5) = 200.00 Amps primary, then the phase current threshold for phase high
current tripping operates at a value equal to:
12.00
•
200.00 Amps primary = 2400.00 Amps primary
The upper limit of this setting (20.00 multiples) is calculated from the Amps secondary range upper
limit [20] and settings
CT Ratio (No. 3) [200.0] and Min. trip - phase (No. 5) [200.00]:
(20
•
200.0)/200.00 = 20.00 multiples (upper limit)
Due to processor calculations and rounding techniques, displayed range numbers may appear slightly
different than expected (e.g., 19.99 instead of 20.00).
•
This setting is hidden and set to OFF if High current trip - phase is set to N.