Protection T; Neutral - ABB SACE Emax 2 Series Installation, Operation And Maintenance Instructions

Protection T

92 | © 2013 ABB | 1SDH001000R0002 - L7804
Path
Main page - Menus - Settings - Circuit-breaker
Function
The protection T protects the circuit-breaker against abnormal temperatures recorded by the
release.
It is always active, and has two states, according to the temperature read:
State Temperature Range
Warning -25 < t <-20 or 70 < t < 85
Alarm t <-25 or t>85
IMPORTANT: the opening command is sent only if the parameter Trip Enable
is ON.
The protection T has Trip Enable, see page 93.

Neutral

Path
Main page - Menus - Settings - Circuit-breaker
Function
The purpose of the Neutral protection is to characterize the protections L, S and I on the
Neutral pole with a control factor different to the other phases.
IMPORTANT: the protection is available with four-pole circuit-breakers (4P)
or three-pole circuit-breakers with external neutral (3P+N).
Parameters
The following is a description of the parameters:
Parameter
Enabling
Neutral
threshold
Limitations
The adjustment of the Neutral threshold to values of 200% and 150% must be performed
considering the following formula: (I1 x InN) ≤ Iu
Where InN is the Neutral threshold set, and Iu the rated current of the circuit-breaker.
Description
Activates/deactivates the protection.
NOTE: with a 4P circuit-breaker and neutral Off, the
measurement of the current is provide in any case.
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
protections, the Neutral current is considered double the real one).
• 100%.
• 150%.
• 200%: highest tripping threshold (in reference to the curves of the
protections, the Neutral current is considered double the real one).
ABB | SACE Emax 2
Release actions
Display off; Warning LED on @ 0.5Hz.
Display off; Alarm and Warning LEDs
on @2Hz; Circuit beaker opening
command.
Ekip Touch protection release | 9 - Touch protections