ABB | SACE Emax 2
Ekip Dip protection trip unit | 2 - Protections
43 | © 2017 ABB | 1SDH000999R0002 - ECN000058721 - Rev. B
Summary table of protections
ABB
ANSI
(5)
Threshold
(1)
Threshold
tolerance
(3)
Time
(1)
Calculation
formula t
t
(2)
Example
calculation t
t
(2)
Tolerance t
t
(3)
L 49
I1 =
0.4…1 In
activation for If in the
range (1.05...1.2)
x I1
t1 =
3…144 s
t
t
=
(9 t1) / (If / I1)
2
t
t
= 6.75 s with:
I1 = 0.4 In; t1 = 3 s;
If = 0.8 In
± 10 % with If ≤ 6 In
± 20 % with If > 6 In
S
(t = k)
50 TD
I2 =
0.6...10 In
± 7 % with If ≤ 6 In
± 10 % with If > 6 In
t2 =
0.1…0.8 s
t
t
= t2 -
The better of the two
values:
± 10 % or ± 40 ms
S
(t = k / l
2
)
51
I2 =
0.6...10 In
± 7 % with If ≤ 6 In
± 10 % with If > 6 In
t2 =
0.1…0.8 s
t
t
=
(100 t2) / (If)
2
t
t
= 5 s con:
I2 = 1 In; t2 = 0.8 s;
If = 4 In
± 15 % with If ≤ 6 In
± 20 % with If > 6 In
I 50
I3 =
1.5...15 In
± 10 % Not adjustable t
t
≤ 30 ms - -
G
(t = k)
50N TD
I4
(4)
=
0.1...1 In
± 7 %
t4 =
0.1…0.8 s
t
t
= t4 -
The better of the two
values:
± 10 % or ± 40 ms
G
(t = k / l
2
)
51N
I4
(4)
=
0.1...1 In
± 7 %
t4 =
0.1…0.8 s
t
t
=
2 / (If / I4)
2
t
t
= 0.32 s with:
I4 = 0.8 In; t4 = 0.2
s; If = 2 In
± 15 %
Iinst -
Defined by
ABB
- Instantaneous - - -
(1)
See the serigraph for the available combinations.
(2)
t
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
calculate t
t
, as shown in the example.
(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
2
) - Dynamic time curve
• t
t
- Tripping time
• If - Primary fault current
Tolerances in particular cases
If the conditions defined in point
(3)
of the above table are not guaranteed, the following tolerances apply:
Protection Tolerance threshold
Tolerance t
t
L Activation for If in the range (1.05...1.2) x I1 ± 20 %
S ± 10 % ± 20 %
I ± 15 % ≤ 60 ms
G ± 15 % ± 20 %
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