Summary Table Of Protections - ABB SACE Emax 2 Installation, Operation And Maintenance Instructions For The Installer And The User
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 serigraph for the available combinations.
(2)
t
calculation is valid for If values that have exceeded the trip threshold of the protection. Use fault current and threshold values expressed in In to
t
calculate t
, as shown in the example.
t
(3)
Tolerances valid with trip unit 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)
All thresholds are activated in the presence of auxiliary power supply. If there is no auxiliary power supply, the minimum threshold is automatically
limited to 0.2 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 | © 2017 ABB | 1SDH000999R0002 - ECN000058721 - Rev. B
Threshold
Time
(1)
tolerance
(3)
activation for If in the
t1 =
range (1.05...1.2)
3...144 s
x I1
± 7 % with If ≤ 6 In
t2 =
± 10 % with If > 6 In
0.1...0.8 s
± 7 % with If ≤ 6 In
t2 =
± 10 % with If > 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
(1)
formula 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
Tolerance t
calculation 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 trip unit | 2 - Protections
(3)
t
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