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

2 - Protections

L Protection

t
I1
L
t1
37 | © 2014 ABB | 1SDH000999R0002 - L8569
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 current read
increases.
Parameters
All the parameters that can be modified by the user affect the response curve, and related tripping times.
I
Parameter 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).
Threshold I1
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).
Time t1
Example (with I1 set to 400 A): the protection is activated for currents read between 420 A
(1)
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 42.
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.
IMPORTANT:
The protection limits the tripping time to 1 second in two cases:
• if according to the calculation the time is less than 1 second.
• If the fault current is greater than 12 In.
ABB | SACE Emax 2
.
(1)
Ekip Dip protection release | 2 - Protections