Protections; L Protection - ABB SACE Emax E1.2 Operating Instructions For The Design Engineer

2 - Protections

L Protection

t
I1
20 | © 2017 ABB | 1SDH001330R0002 - ECN000058721 Rev. A
L protection protects against overloads
NOTE: the protection is available and active for all the versions of the trip unit.
When the activation threshold is exceeded, the protection trips in a time that decreases as the current read
L
increases.
Parameters
t1
All the parameters that can be modified by the user affect the response curve, and related tripping times.
I
Parameter
Threshold I1
Time t1
Example (with I1 set to 400 A): the protection is activated for currents between 420 A and
(1)
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 Pre-alarm. See page 25.
Description
The value I1 contributes in calculating the tripping time, and also defines the current
value that, if exceeded, activates the protection (with reference to the curve, it is the
part parallel to the y-axis).
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 (with reference to the curve,
T1 affects the entire curve by shifting it as a whole along the y-axis).
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 trip unit | 2 - Protections