Neutral And Frequency - ABB SACE Emax 2 Series Installation, Operation And Maintenance Instructions

Neutral and Frequency Adjusting the neutral setting serves to characterize the protections L, S and I on the Neutral
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pole with a control factor different to the other phases.
NOTE: use the adjustment of the neutral setting only with 4P or 3P circuit-breakers
with external neutral: with 3P 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
By setting the threshold dip-switches to the Off position, the protection
Enabling
on the Neutral line is disabled.
Represented as a percentage; it defines the multiplication factor of
the neutral current, for calculating the activation threshold of the
protections:
• 50%: lowest tripping threshold (in reference to the curves of the
Threshold (InN)
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).
ABB | SACE Emax 2
Ekip Dip protection release | 2 - Protections