ABB | SACE Emax 2
14 | © 2018 ABB | 1SDH001316R0002 - ECN000086018 - Rev. C
Ekip Touch protection trip unit | 6 - Touch protections
Continued from the previous page
The following are the details of the protections according to standard IEC 60255-151:
Protection
Curve parameters
Calculation formula t
t
(3)
Calculation example t
t
(3)
L
(60255-151 SI)
a = 0.02; b = 0.15873;
k = 0.16
t
t
=
(t1 x k x b) / ((If / I1)
a
-1)
t
t
= 4.78 s with:
I1 = 0.4 In; t1 = 3 s; If = 0.8 In
L
(60255-151 VI)
a = 1; b = 0.148148;
k = 13.7
t
t
=
(t1 x k x b) / ((If / I1)
a
-1)
t
t
= 6 s with:
I1 = 0.4 In; t1 = 3 s; If = 0.8 In
L
(60255-151 EI)
a = 2; b = 0.1;
k = 82
t
t
=
(t1 x k x b) / ((If / I1)
a
-1)
t
t
= 8 s with:
I1 = 0.4 In; t1 = 3 s; If = 0.8 In
L
(60255-151 I
4
)
a = 4; b = 1;
k = 82
t
t
=
(t1 x k x b) / ((If / I1)
a
-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
ANSI
(1)
Threshold
Threshold
tolerance
(3)
Time
(7)
Calculation
formula t
t
(3)
Tolerance t
t
(3)
S
(Startup)
(6)
-
If
startup
= 0.6...10 In
step = 0.1 In
± 7 % with If
≤
6 In
± 10 % with If > 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)
-
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)
68
-
-
t2
SdZ
= 0.04…0.2 s
step = 0.01 s
-
-
G
(SdZ)
68
-
-
t4
SdZ
= 0.04…0.2 s
step = 0.01 s
-
-
(1)
ANSI / IEEE C37-2 encoding.
(2)
t
t
calculation is valid for If values exceeding the trip threshold of the protection. Use fault current and threshold values expressed in In to calculate t
t
, as shown in the example.
(3)
Valid tolerances with steady-state energized trip unit or trip unit energized by auxiliary power supply, tripping time
≥
100 ms, temperature and
currents within operating limits. If these conditions are not guaranteed, the tolerances in the table that following these notes are valid.
(4)
In the presence of auxiliary power supply, you can select all the thresholds. In self-supply mode 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 other sizes).
(5)
The MCR time is the time for which the protection remains active after circuit-breaker closing. Tripping time, not adjustable, 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 during which the protection with the different threshold remains active, calculated from
the moment the startup threshold is exceeded.
(8)
With t4 = Instantaneous, the maximum tolerance is 50 ms.
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 %
