Page 42 - Sace Emax 2 Catalogue

3/18 SACE EMA X 2 LOW VOLTAGE AIR CIRCUIT-BRE AKERS

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Technical characteristics for protection

trip units

Protection functions

ABB Code ANSI/IEEE Function Threshold Trip time (3) Excludibility Pre Alarm Trip curve Ekip Dip
C37.2 Code
L 49 Overload protection I1 = 0.4 - 0.42 - 0.45 - 0.47 - 0.5 - 0.52 - 0.55 - 0.57 - 0.6 - 0.62 - 0.65 - 0.67 - 0.7 - with If = 3 I1, t1 = 3 - 12 - 24 - 36 - 48 - 72 - 108 - 144s (2) no 50 ... 90% I1 t = k / I 2
0.72 - 0.75 - 0.77 - 0.8 - 0.82 - 0.85 - 0.87 - 0.9 - 0.92 - 0.95 - 0.97 - 1 x In Step 1%
Thermal memory no
Tolerance trip between 1.05 and 1.2 x I1 ± 10% If ≤ 6 x In
± 20% If > 6 x In
S 50TD Time-delayed overcurrent protection I2 = 0.6 - 0.8 - 1 - 1.5 - 2 - 2.5 - 3 - 3.5 - 4 - 5 - 6 - 7 - 8 - 9 - 10 x In with If > I2, t2 = 0.1 - 0.2 - 0.3 - 0.4 - 0.5 - 0.6 - 0.7 - 0.8s yes - t = k
Tolerance ± 7% If ≤ 6 x In The better of the two data:
± 10% If > 6 x In ± 10% t2 or ± 40 ms
51 Time-delayed overcurrent protection I2 = 0.6 - 0.8 - 1 - 1.5 - 2 - 2.5 - 3 - 3.5 - 4 - 5 - 6 - 7 - 8 - 9 - 10 x In with If = 10 In, t2 = 0.1 - 0.2 - 0.3 - 0.4 - 0.5 - 0.6 - 0.7 - 0.8s yes - t = k / I 2
Thermal memory yes -
Tolerance ± 7% If ≤ 6 x In ± 15% If ≤ 6 x In
± 10% If > 6 x In ± 20% If > 6 x In
I 50 Instantaneous overcurrent protection I3= 1.5 - 2 - 3 - 4 - 5 - 6 - 7 - 8 - 9 - 10 - 11 - 12 - 13 - 14 - 15 x In Instantaneous yes - t = k
Tolerance ± 10% ≤ 30 ms
G 50N TD Earth fault protection I4 = 0.1 - 0.2 - 0.3 - 0.4 - 0.6 - 0.8 - 1 x In with If > I4, t4 = 0.1 - 0.2 - 0.4 - 0.8s yes 50 ... 90% I4 t = k
(1)
Step 1%
Tolerance ± 7% The better of the two data:
± 10% t4 or ± 40 ms
51N Earth fault protection I4 = 0.1 - 0.2 - 0.3 - 0.4 - 0.6 - 0.8 - 1 x In with If = 3In, t4 = 0.1 - 0.2 - 0.4 - 0.8s yes 50 ... 90% I4 t = k / I 2
(1)
Step 1%
Tolerance ± 7% ± 15%
(1) With Vaux all thresholds are available. Without Vaux minimum threshold is limited to: 0.3In (with In = 100A), 0.25In (with In = 400A) or 0.2In (for all other ratings)
(2) The minimum trip time is 1s, regardless of the type of curve set (self-protection)
(3) Total clearing time is the sum of breaking time and trip time
The tollerances above apply to trip units already powered by the main
circuit with current flowing in at least two phases or an auxiliary power
supply. In all other cases the following tollerance values apply
ABB Code Trip threshold Trip time
L Trip between 1.05 and 1.2 x I1 ± 20%
S ± 10% ± 20%
I ± 15% ≤ 60ms
G ± 15% ± 20%