T Protection; Neutral - ABB SACE Emax E1.2 Operating Instructions For The Design Engineer

T Protection Path
70 | © 2017 ABB | 1SDH001330R0002 - ECN000058721 Rev. A
Main page - Menus - Settings - Circuit-breaker
Function
T protection protects the circuit-breaker against abnormal temperatures recorded by the trip unit.
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 o t > 85
IMPORTANT: the opening command is sent only if the parameter Trip Enable is ON.
T protection has StartUp enable, see page 71.
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 from the other phases.
IMPORTANT: the protection is available with four-pole circuit-breakers or three-pole
circuit-breakers with external neutral.
Parameters
Here is a list of the available parameters:
Parameter
Configuration
Enable
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
I1 indicates the threshold of L protection in Amperes (example: In = 1000 A; I1 = 0.45 In = 450 A), InN is the
neutral threshold expressed as a multiplication factor (example: 2), Iu indicates the size of the circuit-breaker
(example: 1000 A).
Description
This parameter is available with three-pole circuit-breakers and makes it possible
to activate (3 P + N setting) or deactivate (3 P setting) the presence of the external

neutral.

To activate/deactivate the protection.
NOTE: with neutral present (four-pole or three-pole circuit-breakers
configured with external neutral), the neutral current measurement is available
even when the protection is deactivated.
Represented as a percentage; it defines the multiplication factor applied to the
tripping thresholds of the protections:
• 50%: trip threshold of the neutral current lower than other phases.
• 100%: same trip thresholds for all poles.
• 150%: trip threshold of the neutral current higher than other phases.
• 200%: trip threshold of the neutral current higher than other phases.
Trip unit actions
Display off; Warning LED on @ 0.5Hz.
Display off; Alarm and Warning LEDs on @2Hz;
Circuit beaker opening command.
Ekip Touch protection trip unit | 9 - Touch protections
ABB | SACE Emax 2