Summary Table Of Protections - ABB SACE Emax 2 Installation, Operation And Maintenance Instructions
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)
51N
(t = k / l
)
0.1...1 In
2
Defined by
Iinst
-
ABB
(1)
See the screen-print for the available combinations.
(2)
The calculation of t
is valid for values of If that have exceeded the activation threshold of the protection.
t
(3)
Tolerances valid with release energized in service conditions or with the auxiliary; tripping time ≥ 100 ms, temperature and currents within operating
limits. If the conditions are not guaranteed, the tolerances in the table shown below apply.
(4)
In the presence of an auxiliary power supply all the thresholds are active. If the auxiliary power supply is not present, the minimum threshold is auto-
matically limited to the higher value between 100 A and 0.3 In
(5)
ANSI / IEEE C37-2 encoding.
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 %
43 | © 2014 ABB | 1SDH000999R0002 - L8569
Threshold tole-
Time
(1)
rance
(3)
activation for If in the
t1 =
range (1.05...1.2)
3...144 s
x I1
± 7 % with I2 ≤ 6 In
t2 =
± 10 % with I2 > 6 In
0.1...0.8 s
± 7 % with I2 ≤ 6 In
t2 =
± 10 % with I2 > 6 In
0.1...0.8 s
± 10 %
Not adjustable t
t4 =
± 7 %
0.1...0.8 s
t4 =
± 7 %
0.1...0.8 s
-
Instantaneous -
of the above table are not guaranteed, the following tolerances apply:
(3)
Calculation for-
(1)
mula t
(2)
t
t
=
t
(9 t1) / (If / I1)
2
t
= t2
t
t
=
t
(100 t2) / (If)
2
≤ 30 ms
t
t
= t4
t
t
=
t
2 / (If / I4)
2
Tolerance t
t
± 20 %
± 20 %
≤ 60 ms
± 20 %
ABB | SACE Emax 2
Example calcula-
Tolerance t
tion t
(2)
t
t
= 6.75 s with:
± 10 % with If ≤ 6 In
t
I1 = 0.4 In; t1 = 3 s;
± 20 % with If > 6 In
If = 0.8 In
The better of the two
-
values:
± 10 % or ± 40 ms
t
= 5 s con:
± 15 % with If ≤ 6 In
t
I2 = 1 In; t2 = 0.8 s;
± 20 % with If > 6 In
If = 4 In
-
-
The better of the two
-
values:
± 10 % or ± 40 ms
t
= 0.32 s with:
t
I4 = 0.8 In; t4 = 0.2
± 15 %
s; If = 2 In
-
-
Ekip Dip protection release | 2 - Protections
(3)
t
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