ABB SACE Emax 2 - Neutral and Frequency

ABB | SACE Emax 2
Ekip Dip protection release | 2 - Protections
41 | © 2014 ABB | 1SDH000999R0002 - L8569
Neutral and frequency
Adjusting the neutral setting serves to characterize the protections L, S and I on the Neutral pole with a
control factor different to the other phases.
NOTE: use the adjustment of the neutral setting only with four-pole or three-pole circuit-
breakers with external neutral: with three-pole circuit-breakers and neutral protection active,
the release signals the absence of the current sensor.
The adjustment of the frequency is used in order to set the installation frequency (between 50 and 60 Hz).
Neutral parameters
The user can activate the protection and set the percentage for calculation of the protection thresholds.
Parameter Description
Enable
By setting the threshold dip-switches to the Off position, the protection on the Neu-
tral is disabled.
Threshold InN
Represented as a percentage; it defines the multiplication factor of the neutral cur
-
rent, for calculating the intervention threshold of the protections:
•50%:lowesttrippingthreshold(inreferencetothecurvesoftheprotections,the
neutral current is considered double the real one).
•100%:trippingthresholdequaltotheotherphases.
•200%:highesttrippingthreshold(inreferencetothecurvesoftheprotections,the
neutral current is considered double the real one).
Limitations
The adjustment of the Neutral threshold to value of 200 % must be performed considering the following
formula: (I1 * InN) ≤ Iu.
I1 indicates the threshold of protection L in Amperes (example: 600 A), InN is the neutral threshold expressed
as a multiplication factor (example: 1.5), Iu indicates the size of the circuit-breaker (example: 1000 A).