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

Protection S

t
I2
S
t2
I
39 | © 2013 ABB | 1SDH001000R0002 - L7804
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
All the parameters that can be modified by the user affect the response curve, and related
tripping times.
Parameter Description
By setting the threshold dip-switches to the Off position, the protection
Enabling
is disabled.
Determines the dynamic of the curve and the tripping time, fixed or
dynamic according to the selection:
Type of curve
NOTE: 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 44.
It defines the current value that if exceeded activates the protection (in
reference to the curve, it is the part parallel to the ordinate).
IMPORTANT:
Threshold (I2)
• The I2 threshold set must be higher than the I1 threshold.
An incorrect configuration returns an alarm signal.
• The delay is interrupted if the current drops below the
activation threshold.
The selected function determines the contribution of t2:
• fixed time: t2 is the delay time between the exceeding of the I2
threshold and the sending of the opening command.
• Dynamic time: t2 contributes in calculating the tripping time (in
reference to the curve, t2 affects the entire curve, shifting it as a whole
Time (t2)
along the vertical axis).
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
With the modules Ekip T&P or Ekip Bluetooth and with the Ekip Connect software, it is possible
to activate the function Thermal Memory. See page 43.
ABB | SACE Emax 2
Ekip Dip protection release | 2 - Protections