Protection Against Instantaneous Short-Circuit "Iinst; Summary Table Of Protections; Trip Curves; Trip Curves For Functions L-I - ABB Emax E1 Installation And Service Instructions Manual

12.4.6. Protection against instantaneous short-circuit "Iinst"

The purpose of this protection is to maintain the integrity of the circuit-breaker and installation in the case of particularly high
current requiring shorter reaction times than those guaranteed by the instantaneous short-circuit protection.
The protection cannot be disabled. It has a single fi xed time protection curve and the threshold level is exclusively at the charge
of ABB personnel.

12.4.7. Summary table of protections

Trip threshold
0.4 - 0.425 - 0.45 - 0.475 - 0.5 -
0.525 - 0.55 - 0.575 - 0.6 - 0.625 -
L I1

0.65 - 0.675 - 0,7 - 0.725 - 0.75 -
2
(t=k/I ) =
0.775 - 0.8 - 0.825 - 0.85 - 0.875 -
0.9 - 0.925 - 0.975 - 1 x In
S I2 1 - 1.5 - 2 - 2.5 - 3 - 3.5 - 4 - 5 -

(t=k) =
6 - 7 - 8 - 8.5 - 9 - 9.5 - 10 x In
S I2 1 - 1.5 - 2 - 2.5 - 3 - 3.5 - 4 - 5 -

2
(t=k/I ) = 6 - 7 - 8 - 8.5 - 9 - 9.5 - 10 x In
I I3 1,5 - 2 - 3 - 4 - 5 - 6 - 7 - 8 - 9 -

(t=k) =
10 - 11 - 12 - 13 - 14 - 15 x In
I4 0,2 - 0,3 - 0,4 - 0,6 - 0,8 - 0,9 -
G

= 1 x In
(t=k)
I4 0,2 - 0,3 - 0,4 - 0,6 - 0,8 - 0,9 -
G

= 1 x In
2
(t=k/I )
(1) The minimum value of this trip is 1s regardless of the type of curve set
(self-protection).
(2) These tolerances apply in the following conditions:
- Self-powered relay (no start-up) with 2 or 3 supplied phases
and/or in presence of auxiliary supply. .
- operating temperature within the -25° ...70° range
- primary current values within the operating limits (see par.
12.2.5.1)

12.4.8. Trip curves

The trip curves provided are merely for guidance and only show a sub-group of the possible selections.

12.4.8.1. Trip curves for functions L-I

Model L6555
Trip time
t1 3 - 12 - 24 - 36 -
= 48 - 72 - 108 -
144 s (1)
@I =3I1
f
Where I > I2
f
t2 0.1 - 0.2 - 0.3 - 0.4 -
= 0.5 - 0.6 - 0.7 - 0.8 s
t2 0.1 - 0.2 - 0.3 - 0.4 -
= 0.5 - 0.6 - 0.7 - 0.8 s
@ 10 In
 30 ms
Where I > I4
f
t4 0.1 - 0.2 - 0.4 - 0.8 s
=
Minimum trip time
t4 0.1 - 0.2 - 0.4 - 0.8 s
=
For all cases not covered by the above hypotheses, the following tolerances apply:
Protection rip threshold
L Release between 1,05 e 1,25 x I1
S ± 10%
I ± 15%
G ± 10%
Others ± 20%
Apparatus
Doc. no.
Trip
Trip
time
threshold
(2)
tolerance
tolerance
Release
between ± 10% I
1.05 and 1.2 ± 20% I
x I1
 6
± 7% I
f
x In
The best of the two data:
± 10% o ± 40 ms
± 10% I >6
f
x In
 6
± 7% I
f
x In ± 15% I
± 10% I >6 ± 20% I
f
x In
± 10%
The best of the two data:
± 7%
± 10% o ± 40 ms
± 7% ± 15%
Trip time
± 20%
± 20%
 60ms
± 20%
Emax
1SDH000460R0002
(2)
 6 x In
f
> 6 x In
f
 6 x In
f
> 6 x In
f
Scale
Page No
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