Eaton Digitrip 3000 series - Page 54

Instruction Leaflet DT3000
Page 50 Effective: Date 07/02 I.B. 17555D
For more information visit: www.cutler-hammer.eaton.com
Supersedes I.B. 17555C dated November 1999
Figure 7-9 Inverse Time Overcurrent Ground I
2
T Curve (SC-5400-92B)
0.01
0.10
1.00
10.00
100.00
1000.00
10000.00
0.1 1 10 100
Multiple of In (I/I
n
)
Trip Time (seconds)
5 Seconds at 1 per Unit
0.2 Seconds at 1 per Unit
Minimum Pickup 0.1 Maximum Pickup 2.0
40 Seconds at 1 per Unit
Adjustable Inverse Time Overcurrent Pickup
(x I
n
) ( 0. 1………. 2.0 None)
Adjustable Inverse Time Overcurrent Time Multiplier Ground
(Sec. @ 1 x I
n
) (0.2 s……….40 s)
Tolerance: Inverse Time Overcurrent Pickup is ±5%
Inverse Time Overcurrent Time Multiplier is ±10 or ±0.75 s
whichever is larger
Mi ni mum Tri p Time i s 0. 05 s