ABB SACE Emax 2 Manual page 33

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
Summary table of additional functions in conjunction with protections S, I, G:
ABB ANSI (1) Threshold
S If
-
startup
(Startup) step = 0.1 In
(6)
I I3
-
(Startup) step = 0.1 In
G I4
-
(Startup) step = 0.02 In
(6)
S
68 -
(SdZ)
G
68 -
(SdZ)
(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 expressed in In to
t
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
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
L
S
I
G
2I
Other
31 | © 2019 ABB | 1SDH001316R1002 - ECN000086501 - Rev. A
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
Threshold
tolerance
= 0.6...10 In ± 7 % with If ≤ 6 In
± 10 % with If > 6 In
= 1.5...15 In
± 10 %
startup
= 0.2...1 In
± 7 %
startup
-
-
2
, the protection trip time is forced to the set value if the calculation results give a theoretical tt value lower
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) -1)
a
t
t = (t1 x k x b) / ((If / I1) -1)
a
t
Time (7)
(3)
t2 = 0.1...30 s
startup
step = 0.01 s
t3 = 0.1...30 s
startup
step = 0.01 s
t4 = 0.1...30 s
startup
step = 0.01 s
t2 = 0.04...0.2 s
SdZ
step = 0.01 s
t4 = 0.04...0.2 s
SdZ
step = 0.01 s
Tolerance t
± 20 %
± 20 %
≤ 60 ms
± 20 % (60 ms with t4 = instantaneous)
≤ 60 ms
± 20 %
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
Calculation
Tolerance t
formula t
(3)
t
The better of the two values:
t = t2
± 10 % or ± 40 ms
t
t ≤ 30 ms -
t
The better of the two values:
t = t4
± 10 % or ± 40 ms
t
- -
- -
t
Protections | 2 - Standard Protections
ABB | SACE Emax 2
(3)
t
(3)
t