Page 33 - ACB-E1.2-E2.2-E4.2-E6.2

ABB | SACE Emax 2
Continued from the previous page ABB | SA CE Ema x 2

Details of protection according to standard IEC 60255-151:
Protection Curve parameters Calculation formula t t (3)(9) Calculation example t t (3)
L a = 0.02; b = 0.15873; t = (t1 x k x b) / ((If / I1) -1) t = 4.78 s with:
t
a
(60255-151 SI) k = 0.16 t I1 = 0.4 In; t1 = 3 s; If = 0.8 In
L a = 1; b = 0.148148; t = (t1 x k x b) / ((If / I1) -1) t = 6 s with:
a
t
(60255-151 VI) k = 13.7 t I1 = 0.4 In; t1 = 3 s; If = 0.8 In
L a = 2; b = 0.1; t = (t1 x k x b) / ((If / I1) -1) t = 8 s with:
t
a
(60255-151 EI) k = 82 t I1 = 0.4 In; t1 = 3 s; If = 0.8 In
L a = 4; b = 1; t = (t1 x k x b) / ((If / I1) -1) t = 16 s with:
a
t
(60255-151 I ) k = 82 t I1 = 0.4 In; t1 = 3 s; If = 0.8 In
4
Summary table of additional functions in conjunction with protections S, S2, I, G:
Threshold tole- Calculation for-
ABB ANSI (1) Threshold Time (7) Tolerance t (3)
rance (3) mula t (3) t
t
± 7 % with If ≤ 6 In The better of the
S I2 startup = 0.6...10 In t2 startup = 0.1…30 s
(Startup) (6) - step = 0.1 In ± 10 % with If > step = 0.01 s t = t2 two values:
t
6 In ± 10 % or ± 40 ms
± 7 % with If ≤ 6 In The better of the
S2 - I5 startup = 0.6...10 In ± 10 % with If > t5 startup = 0.1…30 s t = t5 two values:
(Startup) (6) step = 0.1 In step = 0.01 s t
6 In ± 10 % or ± 40 ms
I I3 startup = 1.5...15 In t3 startup = 0.1…30 s
(Startup) - step = 0.1 In ± 10 % step = 0.01 s t ≤ 30 ms -
t
The better of the
G - I4 startup = 0.2...1 In ± 7 % t4 startup = 0.1…30 s t = t4 two values:
(Startup) (6) step = 0.02 In step = 0.01 s t
± 10 % or ± 40 ms
S t2 SdZ = 0.04…0.2 s
(SdZ) 68 - - step = 0.01 s - -
G t4 SdZ = 0.04…0.2 s
(SdZ) 68 - - step = 0.01 s - -
(1) ANSI / IEEE C37-2 codification
(2) t calculation is valid for If values that have exceeded the trip threshold of the protection. Use fault current and threshold values
t
expressed in In to calculate t , as shown in the example.
t
(3) Tolerance values valid with Trip unit supplied at full rate or by auxiliary power supply, trip time ≥ 100 ms, temperature and current values
within operating limits. The tolerance values of the table after the notes apply if the conditions are not guaranteed
(4) All thresholds can be selected in the presence of auxiliary power supply. In self-supply conditions, 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 the other sizes)
(5) Time MCR is the time for which the protection remains active after the circuit-breaker has closed. Similarly to protection I, the trip time
cannot be adjusted
(6) Startup can only be activated with function set at fixed time
(7) For the startup functions, the time indicated is the period during which the protection remains active with the different threshold,
calculated from the point in which the startup threshold is exceeded
(8) With t4 = instantaneous, the maximum tolerance is 50 ms
(9) L protection: the trip time of the protection is forcibly set at 1 s if the calculation results give a lower theoretical tt value and/or if the
current reading is more than 12 In
(10) G protection: the protection deactivates automatically if disconnection of one or more sensors is detected or if current If is more than
8 In (with I4 ≥ 0.8 In), 6 In (with 0.5 In ≤ I4 < 0.8 In), 4 In (with 0.2 In ≤ I4 < 0.5 In) or 2 In (with I4 < 0.2 In)
(11) S and G protection: with curve t= k/I , the protection trip time is forced to the set value if the calculation results give a theoretical tt
2
value lower than the parameter itself
(12) A maximum value of I4= 1200 A is allowed for UL versions; if an attempt is made to set a higher value, the trip unit signals an alarm and
interrupts the modification
(13) For UL versions, t2 and t4 can be set at 0.4 s maximum

Protection Tolerance threshold Tolerance t
t
L Activation for If in the range 1.05...1.2 I1 ± 20 %
S ± 10 % ± 20 %
I ± 15 % ≤ 60 ms
G ± 15 % ± 20 % (60 ms with t4 = instantaneous)
2I ± 15 % ≤ 60 ms
Other - ± 20 %

31 | © 2022 ABB | 1SDH001316R1002 - ECN000232533 Protections