ABB SACE Emax 2 Instructions Manual page 20
Emax low voltage air circuit-breakers e1.2-e2.2-e4.2-e6.2
Hide thumbs
Also See for SACE Emax 2:
Table of Contents
Advertisement
Continued from the previous page
Details of protection according to standard IEC 60255-151:
Protection
L
(60255-151 SI)
L
(60255-151 VI)
L
(60255-151 EI)
L
(60255-151 I
)
4
NOTE: the performance of the additional Startup and Zone selectivity functions is described in the manual 1SDH001330R1002.
ANSI / IEEE C37-2 codification
(1)
t
calculation is valid for If values that have exceeded the trip threshold of the protection. Use fault current and threshold values
(2)
t
expressed in In to calculate 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
All thresholds can be selected in the presence of auxiliary power supply. In self-supply conditions, the minimum threshold is limited to:
(4)
0.3 In (with In = 100 A), 0.25 In (with In = 400 A) or 0.2 In (for all the other sizes)
Time MCR is the time for which the protection remains active after the circuit-breaker has closed. Similarly to protection I, the trip time
(5)
cannot be adjusted
(6)
Startup can only be activated with function set at fixed time
For the startup functions, the time indicated is the period during which the protection remains active with the different threshold,
(7)
calculated from the point in which the startup threshold is exceeded
(8)
With t4 = instantaneous, the maximum tolerance is 50 ms
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
(9)
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)
S and G protection: with curve t= k/I
(11)
value lower than the parameter itself
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
(12)
interrupts the modification
(13)
For UL versions, t2 and t4 can be set at 0.4 s maximum
Protection
L
S
I
G
2I
Other
18 | © 2023 ABB | 1SDH001316R1002 - ECN000297030
Curve parameters
a = 0.02; b = 0.15873;
k = 0.16
a = 1; b = 0.148148;
k = 13.7
a = 2; b = 0.1;
k = 82
a = 4; b = 1;
k = 82
, as shown in the example.
t
, the protection trip time is forced to the set value if the calculation results give a theoretical tt
2
Tolerance threshold
Activation for If in the range 1.05...1.2 I1
± 10 %
± 15 %
± 15 %
± 15 %
-
Calculation formula t
(3)(9)
t
t
= (t1 x k x b) / ((If / I1)
-1)
a
t
t
= (t1 x k x b) / ((If / I1)
-1)
a
t
t
= (t1 x k x b) / ((If / I1)
a
-1)
t
t
= (t1 x k x b) / ((If / I1)
a
-1)
t
Calculation example t
t
= 4.78 s with:
t
I1 = 0.4 In; t1 = 3 s; If = 0.8 In
t
= 6 s with:
t
I1 = 0.4 In; t1 = 3 s; If = 0.8 In
t
= 8 s with:
t
I1 = 0.4 In; t1 = 3 s; If = 0.8 In
t
= 16 s with:
t
I1 = 0.4 In; t1 = 3 s; If = 0.8 In
Tolerance t
t
± 20 %
± 20 %
≤ 60 ms
± 20 % (60 ms with t4 = instantaneous)
≤ 60 ms
± 20 %
ABB | SACE Emax 2
ABB | SACE Emax 2
(3)
t
Protections
Advertisement
Table of Contents
