ABB Sace Emax 2 Installation, Operation And Maintenance Instructions For The Installer And The User page 41
Low voltage air circuit-breakers
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Summary table of protections
ABB
ANSI
Threshold
(5)
I1 =
L
49
0.4...1 In
S
I2 =
50 TD
(t = k)
0.6...10 In
S
I2 =
51
(t = k / l
)
0.6...10 In
2
I3 =
I
50
1.5...15 In
G
I4
(4)
=
50N TD
(t = k)
0.1...1 In
G
I4
=
(4)
(t = k /
51N
0.1...1 In
l
)
2
Defined by
Iinst
-
ABB
See the serigraph for the available combinations.
(1)
t
calculation is valid for If values that have exceeded the trip threshold of the protection. Use fault current and threshold values
(2)
t
expressed in In to calculate t
Tolerances valid with trip unit energized in service conditions or with the auxiliary; tripping time ≥ 100 ms, temperature and currents
(3)
within operating limits. If these conditions are not guaranteed, the tolerances in the table shown below apply.
In the presence of auxiliary power supply, you can select all the thresholds. In self-supply mode the minimum threshold is limited to: 0.3
(4)
In (with In = 100 A), 0.25 In (with In = 400 A) or 0.2 In (for all other sizes).
ANSI / IEEE C37-2 encoding.
(5)
Key
• (t=k) - Fixed time curve
• (t=k/I
) - Dynamic time curve
2
• t
- Tripping time
t
• If - Primary fault current
Tolerances in particular cases
If the conditions defined in point
Protection
Tolerance threshold
L
Activation for If in the range (1.05...1.2) x I1
S
± 10 %
I
± 15 %
G
± 15 %
39 | © 2022 ABB | 1SDH000999R0002 - ECN000232533
Threshold tole-
(1)
rance
(3)
activation for If in
the range (1.05...1.2)
x I1
± 7 % with If ≤ 6 In
± 10 % with If > 6 In
± 7 % with If ≤ 6 In
± 10 % with If > 6 In
± 10 %
± 7 %
± 7 %
-
, as shown in the example.
t
of the above table are not guaranteed, the following tolerances apply:
(3)
Calculation for-
Time
(1)
mula t
(2)
t
t1 =
t
=
t
3...144 s
(9 t1) / (If / I1)
t2 =
t
= t2
0.1...0.8 s
t
t2 =
t
=
t
0.1...0.8 s
(100 t2) / (If)
Not
t
≤ 30 ms
adjustable
t
t4 =
t
= t4
0.1...0.8 s
t
t4 =
t
=
t
0.1...0.8 s
2 / (If / I4)
2
Instantaneous -
Tolerance t
± 20 %
± 20 %
≤ 60 ms
± 20 %
Calculation exam-
ple t
(2)
t
t
= 6.75 s with:
t
I1 = 0.4 In; t1 = 3 s; If
2
= 0.8 In
-
t
= 5 s con:
t
I2 = 1 In; t2 = 0.8 s;
2
If = 4 In
-
-
t
= 0.32 s with:
t
I4 = 0.8 In; t4 = 0.2
s; If = 2 In
-
t
ABB | SACE Emax 2
ABB | SACE Emax 2
Tolerance t
(3)
t
± 10 % with If ≤ 6 In
± 20 % with If > 6 In
The better of the
two values:
± 10 % or ± 40 ms
± 15 % with If ≤ 6 In
± 20 % with If > 6 In
-
The better of the
two values:
± 10 % or ± 40 ms
± 15 %
-
Ekip Dip
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