Schweitzer Engineering SEL-351P - Page 48

Settings
42 SEL-351P Quick-Start Installation and User's Guide (Portuguese)
No. Setting Default Range Incr.
9 Fast curve - ground 1 OFF, U1-U5, C1-C5, recloser or
user curve
The Fast curve - ground setting selects the time-overcurrent curve for ground fast curve tripping. Curve
designations are provided in
Table 6 and Table 7.
If Min. trip - ground (No. 6) is effectively set <0.1 Amp secondary (e.g., for CT ratio [No. 3] = 200.0,
Min. trip - ground (No. 6) <20.00 Amps primary), then Fast curve - ground flattens out above 1.5 Amps
secondary (e.g., for CT ratio [No. 3] = 200.0, Fast curve - ground flattens out above 300 Amps primary).
• This setting is hidden and set to OFF if Min. trip -ground (No. 6) is set to OFF.
• If Fast curve - ground is programmed with a US (U1-U5) or IEC (C1-C5) curve, enter the following
two settings:
Setting Default Range Incr.
Time-dial - ground fast
curve
1.00 0.50 - 15.00 for US curves U1-U5
0.05 - 1.00 for IEC curves C1-C5
0.01
0.01
The Time-dial - ground fast curve setting shifts the US or IEC curve in time by the entered
multiplier.
• This setting is hidden and nonoperative if Fast curve - ground is programmed with a recloser
or user curve.
Setting Default Range Incr.
EM reset - ground fast
curve
N Y/N
The EM reset - ground fast curve setting enables the electromechanical reset emulation for the US
or IEC curve, if set to Y.
• This setting is usually set to N, except for special applications.
• This setting is hidden and set to N if Fast curve - ground is programmed with a recloser or user
curve.
No. Setting Default Range Incr.
10 Delay curve - phase C OFF, U1-U5, C1-C5, recloser or
user curve
The Delay curve - phase setting selects the time-overcurrent curve for phase delay curve tripping. Curve
designations are provided in
Table 6 and Table 7.
• This setting is hidden and set to OFF if Min. trip -phase (No. 5) is set to OFF.
• If Delay curve - phase is programmed with a US (U1-U5) or IEC (C1-C5) curve, enter the following
two settings:
Setting Default Range Incr.
Time-dial - phase delay
curve
1.00 0.50 - 15.00 for US curves U1-U5
0.05 - 1.00 for IEC curves C1-C5
0.01
0.01
The Time-dial - phase delay curve setting shifts the US or IEC curve in time by the entered
multiplier.
• This setting is hidden and nonoperative if Delay curve - phase is programmed with a recloser
or user curve.