ABB SACE Emax 2 Series - Page 99

ABB | SACE Emax 2
Ekip Touch protection release | 9 - Touch protections
95 | © 2013 ABB | 1SDH001000R0002 - L7804
Continued from the previous page
The following are the details of the protections according to standard 60255-3:
Protection Curve Parameters
Calculation formula t
t
(3)
Example calculation t
t
(3)
L
(60255-3 SI)
a = 0.14; b = 0.15873;
k = 0.02
t
t
=
(t1 x a x b) / ((If / I1)
k
-1)
t
t
= 4.78 s with:
I1 = 0.4 In; t1 = 3 s; If = 0.8 In
L
(60255-3 VI)
a = 13.5; b = 0.148148;
k = 1
t
t
=
(t1 x a x b) / ((If / I1)
k
-1)
t
t
= 6 s with:
I1 = 0.4 In; t1 = 3 s; If = 0.8 In
L
(60255-3 EI)
a = 80; b = 0.1;
k = 2
t
t
=
(t1 x a x b) / ((If / I1)
k
-1)
t
t
= 8 s with:
I1 = 0.4 In; t1 = 3 s; If = 0.8 In
L
(60255-3 I
4
)
a = 80; b = 1;
k = 4
t
t
=
(t1 x a x b) / ((If / I1)
k
-1)
t
t
= 16 s with:
I1 = 0.4 In; t1 = 3 s; If = 0.8 In
Table of Additional Functions of the protections
The following table summarises the additional functions combined with protections S, I, G:
ABB Threshold
Threshold tolerance
(3)
Time
(7)
Calculation
formula
t
t
(3)
Tolerance t
t
(3)
S
(Startup)
(6)
I2
startup
= 0.6...10 In
step = 0.1 In
± 7 % with I2 ≤ 6 In
± 10 % with I2 > 6 In
t2
startup
= 0.1…30 s
step = 0.01 s
t
t
= t2
The better of the two values:
± 10 % or ± 40 ms
I
(Startup)
(6)
I3
startup
= 1.5...15 In
step = 0.1 In
± 10 %
t3
startup
= 0.1…30 s
step = 0.01 s
t
t
≤ 30 ms -
G
(Startup)
(6)
I4
startup
= 0.2...1 In
step = 0.02 In
± 7 %
t4
startup
= 0.1…30 s
step = 0.01 s
t
t
= t4
The better of the two values:
± 10 % or ± 40 ms
S
(SdZ)
- -
t2
SdZ
= 0.04…0.2 s
step = 0.01 s
- -
G
(SdZ)
- -
t4
SdZ
= 0.04…0.2 s
step= 0.01 s
- -
NOTES
(1)
For details see the table with all curves defined by standard 60255-3 that can be selected by the user.
(2)
The calculation of t
t
is valid for values of If that have exceeded the activation threshold of the protection.
(3)
Valid tolerances with release energized in service conditions or with the auxiliary, tripping time ≥ 100 ms, temperature and currents within operating
limits. If the conditions are not guaranteed, the tolerances in the table that follows the notes.
(4)
In the presence of an auxiliary power supply all the thresholds are active. If the auxiliary power supply is not present, the minimum threshold is auto-
matically limited to the higher value between 100 A and 25 In
(5)
The MCR time is to be understood as the time for which the protection remains active after the circuit-breaker is closed. Tripping time, not adjusta-
ble, as for protection I.
(6)
Startup can be activated only with the function set to fixed time.
(7)
For the startup functions, the specified time is the period for which the protection with the different threshold remains active, calculated from when
the startup threshold is exceeded.
(8)
With t4 = 0 s, the maximum tolerance is 50 ms.
(9)
ANSI / IEEE C37-2 encoding.
Protection Threshold Tolerance
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 = 0)
Other - ± 20 %