Page 28 - Sace Emax 2 Manual for design engineers

ABB | SACE Emax 2
Summary table of protections

Threshold Calculation Calculation
ABB ANSI (5) Threshold (1) Time (1) Tolerance t (3)
tolerance (3) formula t (2) example t (2) t
t t
activation for If in the t = 6.75 s with:
I1 = t1 = t = t ± 10 % with If ≤ 6 In
L 49 range (1.05...1.2) t I1 = 0.4 In; t1 = 3 s;
0.4…1 In 3…144 s (9 t1) / (If / I1) 2 ± 20 % with If > 6 In
x I1 If = 0.8 In
The better of the
S 50 TD I2 = ± 7 % with If ≤ 6 In t2 = t = t2 - two values:
(t = k) 0.6...10 In ± 10 % with If > 6 In 0.1…0.8 s t
± 10 % or ± 40 ms
t = 5 s con:
S I2 = ± 7 % with If ≤ 6 In t2 = t = t ± 15 % with If ≤ 6 In
t
(t = k / l ) 51 0.6...10 In ± 10 % with If > 6 In 0.1…0.8 s (100 t2) / (If) 2 I2 = 1 In; t2 = 0.8 s; ± 20 % with If > 6 In
2
If = 4 In
I3 =
I 50 ± 10 % Not adjustable t ≤ 30 ms - -
1.5...15 In t
The better of the
G 50N TD I4 = ± 7 % t4 = t = t4 - two values:
(4)
(t = k) 0.1...1 In 0.1…0.8 s t
± 10 % or ± 40 ms
t = 0.32 s with:
G I4 = t4 = t = t
(4)
t
(t = k / l ) 51N 0.1...1 In ± 7 % 0.1…0.8 s 2 / (If / I4) 2 I4 = 0.8 In; t4 = 0.2 ± 15 %
2
s; If = 2 In
Defined by
Iinst - - Instantaneous - - -
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 these conditions are not guaranteed, the tolerances in the table shown below apply.
(4) 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 In (with In
= 100 A), 0.25 In (with In = 400 A) or 0.2 In (for all other sizes).
(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 of the above table are not guaranteed, the following tolerances apply:
(3)
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 %

26 | © 2020 ABB | 1SDH001330R1002 - ECN000134959 - Rev. A Ekip Dip | 1 - Protections - Introduction