S&C IntelliRupter PulseCloser Manual page 41

There is an order of precedence between the Inverse Curve segment, Definite
Time 1, and Definite Time 2 . Definite Time 2 must be higher in pickup magnitude
and faster in time than Definite Time 1 . Definite Time 1 must be higher pickup
magnitude and faster in time than the Inverse Curve segment . See Instruction
Sheet 766-530, "S&C IntelliRupter® PulseCloser® Fault Interrupter: Setup," for
more information .
Fault
Current
Load
Zero
E/M = Electromechanical Reset—Emulates old induction disk relay behavior .
D/T = Definite Time Reset—Better than E/M Reset because it is not affected
by load current .
Fault
Current
Load
Zero
Reset Time = Time for reset from 99 .9% of trip to 0% (with no load current for E/M) .
Common use of D/T is a fast 0 .1 second reset time .
Figure 30. Overcurrent Element reset characteristics.
Setting Examples:
Case 1—This case shows an inverse curve unaltered by a Definite Time setting.
Inverse Curve Segment: SEL U5; Min Trip = 280 A; Min Time = 0; Time Mult = 0.1; Time
Adder = 0; Low Current Cutoff = N/A
Definite Time 1: N/A
See Figure 31 on page 43.
NOTICE
D/T
Time
(not to scale)
D/T
Time
E/M Reset Time
S&C Instruction Sheet 766-530
Protection Setup
100%, Trip
E/M
% of Trip
0%, Reset
100%, Trip
E/M
% of Trip
0%, Reset
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