Protections; L Protection - ABB SACE Emax 2 Series Installation, Operation And Maintenance Instructions

2 - Protections

L Protection

t
I1
t1
38 | © 2013 ABB | 1SDH001000R0002 - L7804
The protection L protects against overloads
NOTE: the protection is available and active for all the versions of the release.
When the activation threshold is exceeded, the protection trips in a time that decreases as the
L
current read increases.
Parameters
All the parameters that can be modified by the user affect the response curve, and related
I
tripping times.
Parameter
Threshold (I1)
Time (t1)
(1) Example (with I1 set to 400 A): the protection is activated for currents read between 420 A
and 480 A.
With the modules Ekip T&P or Ekip Bluetooth and with the Ekip Connect software, it is possible
to activate the function Thermal Memory, and adjust the threshold of Prealarm. See page
43.
Description
The value I1 contributes in calculating the tripping time, and also
defines the current value that, if exceeded, activates the protection (in
reference to the curve, it is the part parallel to the ordinate).
IMPORTANT:
• The protection is activated and starts timing for currents
between 1.05 and 1.2 of the threshold I1 set
• The delay is interrupted if the current drops below the
activation threshold.
The value t1 contributes in calculating the tripping time (in reference
to the curve, T1 affects the entire curve shifting it as a whole along the
vertical axis).
IMPORTANT:
• the minimum tripping time of the protection is 1 second.
• If according to the calculation the tripping time is less, it
is automatically limited to 1 second.
ABB | SACE Emax 2
.
(1)
Ekip Dip protection release | 2 - Protections