Settings
54 SEL-351P Quick-Start Installation and User's Guide (Portuguese)
No. Setting Default Range Incr.
32 High current lockout -
ground
N Y/N
The High current lockout - ground setting enables the following two settings for ground high current
lockout, if set to Y. High current lockout - ground is not affected by the cold load pickup scheme.
• This setting is hidden and set to N if Fast curve - ground (No. 9) and Delay curve - ground (No. 11) are
both set to OFF.
Setting Default Range Incr.
High current lockout -
ground
OFF OFF, 1.00-79.99 multiples of Min.
trip - ground
0.01
The High current lockout - ground (multiples of Min. trip - ground) setting determines the
exceeded ground current threshold at which the SEL-351P goes to the lockout state immediately when
tripping.
Example: If High current lockout - ground = 45.00 (multiples of Min. trip - ground) and Min.
trip - ground (No. 6) = 50.00 Amps primary, then the ground current threshold for ground
high current lockout operates at a value equal to:
45.00 • 50.00 Amps primary = 2250.00 Amps primary
The upper limit of this setting (80.00 multiples) is calculated from the Amps secondary range upper
limit [20] and settings CT Ratio (No. 3) [200.0] and Min. trip - ground (No. 6) [50.00]:
(20 • 200.0)/50.00 = 80.00 multiples (upper limit)
Due to processor calculations and rounding techniques, displayed range numbers may appear slightly
different than expected (e.g., 79.99 instead of 80.00).
• This setting is hidden and set to OFF if High current lockout - ground is set to N.
Setting Default Range Incr.
Activate high current
lockout - ground
OFF OFF, 1-5 1
The Activate high current lockout - ground setting determines when ground high current lockout is
enabled (e.g., if Activate high current lockout - ground = 3, then ground high current tripping is
enabled for the third [3rd] trip operation and every following trip operation).
The setting range for Activate high current lockout - ground adjusts according to Operations to
lockout - ground (e.g., if Operations to lockout - ground = 4, then the range for Activate high
current lockout - ground is from 1 to 4).
• This setting is hidden and set to OFF if High current lockout - ground is set to N.
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