Protections - Introduction - ABB Sace Emax 2 Installation, Operation And Maintenance Instructions For The Installer And The User

1 - Protections - Introduction

Operating principle The protection functions are available with all Ekip Dip versions.
L Protection
t
I1
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If the signal measured exceeds the set threshold, the specific protection activates (prealarm and/
1.
or alarm).
The alarm appears on the display and, after a period of time (timing t
2.
protection parameters set, can convert into a trip command (TRIP) transmitted to the internal
Trip coil of the CB.
NOTE:
• if the signal measured drops below the set threshold before the trip time has elapsed, Ekip
Dip quits the alarm and/or timing state and returns to the normal operating condition
• all protections have a default configuration: check the parameters and change to suit the
installation requirements before putting into service
• to allow circuit-breaker tripping to be controlled by a specific protection, the protection
itself must be enabled
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
L
read increases.
Parameters
t1
All the parameters that can be modified by the user affect the response curve, and related tripping times.
Parameter
I
Threshold I1
Time t1
(1) Example (with I1 set to 400 A): the protection is activated for currents between 420 A and 480 A.
With the module Ekip T&P and with the Ekip Connect software, it is possible to activate the function
Thermal Memory, and adjust the threshold of Pre-alarm.
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
), depending on the
t
.
(1)
Ekip Dip | 1 - Protections - Introduction