Protection S - ABB SACE Emax 2 Series Installation, Operation And Maintenance Instructions

Protection S

t
I2 S
t2
86 | © 2013 ABB | 1SDH001000R0002 - L7804
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
I
The following is a description of the parameters:
Parameter Description
Enabling Activates/deactivates the protection.
Determines the dynamic of the curve and the tripping time, fixed or
dynamic according to the selection:
The calculation of the tripping time of the inverse time curve is based
Function on a mathematical expression. The details are provided in the table on
page 94.
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).
Threshold (I2)
The selected function determines the contribution of t2:
and the sending of the opening command.
Time (t2)
the above curve, t2 affects the entire curve, moving it as a whole along
the vertical axis).
• t=k (ANSI 50TD): fixed time trip.
• t=k / i (ANSI 51): inverse time dynamic tripping.
2
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.
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.
• t=k: t2 is the delay time between the exceeding of the I2 threshold
• t=k / i : t2 contributes in calculating the tripping time (in reference to
2
ABB | SACE Emax 2
Ekip Touch protection release | 9 - Touch protections