ABB | SACE Emax 2
86 | © 2013 ABB | 1SDH001000R0002 - L7804
Ekip Touch protection release | 9 - Touch protections
Protection S
Path
Main page - Menus - Protections
Function
The protection S protects against the selective short circuit.
NOTE: the protection is available for LSI and LSIG versions of the release.
When the activation threshold is exceeded, the protection trips within a fixed or dynamic time
(the time decreases as the current read increases).
Parameters
The following is a description of the parameters:
Parameter Description
Enabling Activates/deactivates the protection.
Function
Determines the dynamic of the curve and the tripping time, fixed or
dynamic according to the selection:
• t=k (ANSI 50TD): fixed time trip.
• t=k / i
2
(ANSI 51): inverse time dynamic tripping.
The calculation of the tripping time of the inverse time curve is based
on a mathematical expression. The details are provided in the table on
page 94.
IMPORTANT: the minimum tripping time of the protection is
t2. If according to the calculation the tripping time is less, it
is automatically limited to t2.
Threshold (I2)
It defines the current value that if exceeded activates the protection (in
reference to the above curve, it is the part of the curve parallel to the
ordinate).
It is represented both as an absolute value (Ampere) and as a relative
value (In, nominal value defined by the Rating Plug).
IMPORTANT: The I2 threshold set must be higher than the
I1 threshold. An incorrect configuration returns an error on
the display and the programming session doesn’t conclude,
with consequent rejection of the changes made to the
parameters.
Time (t2)
The selected function determines the contribution of t2:
• t=k: t2 is the delay time between the exceeding of the I2 threshold
and the sending of the opening command.
• t=k / i
2
: t2 contributes in calculating the tripping time (in reference to
the above curve, t2 affects the entire curve, moving it as a whole along
the vertical axis).
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