ABB SACE Emax 2 Series Operating Instructions Manual page 90

Gext Protection
t
I41
t41
87 | © 2023 ABB | 1SDH001330R1002 - ECN000297030
Function
Gext protection protects against earth faults and detects the fault current with a dedicated external
toroid S.G.R.
G
ext
if S.G.R. toroid current exceeds threshold I41, the protection trips and, after a time established by the
value read and by the parameter settings, transmits the TRIP command.
To check and simulate the trip times in relation to all the parameters, please consult:
• summary table of the protections with the operating characteristics (page 95)
• the graph with trip curve (page 103)
I
Parameters
Toroid configuration is available in the Settings menu (page 49)
Parameter Description
External Toroid It allows the presence of external toroid S.G.R. to be activated
Allows the reference current of the protection to be selected from
among four available quantities, from 100 A to 800 A
Toroid size
connected to the unit
The protection configuration is available in the Advanced menu (page 47)
Parameter Description
Activates/deactivates the protection and its availability in the
Enable
parameters menu
Activates/deactivates transmission of the open command: if
Trip Enable disabled, the alarm and exceedance of protection time are only
managed as information
Establishes curve dynamics and the threshold or trip time
calculation:
Curve
• t= k: fixed time trip
• t= k/I
Establishes the value that activates the protection and
contributes towards calculating the trip time.
Threshold I41 The value is given as both absolute value (amperes) and relative
value (In) and can be set within the range: 0.1 In to 1 In, in 0.001 In
steps
It is the trip time or contributes towards timing calculation,
depending on the type of curve selected.
Time t41
The value is given in seconds and can be set within the range: 0.1
s to 1 s, in 0.05 s steps
Warns that the measured current is near to the protection
activation threshold.
The value is given in percentage of threshold I1 and can be set
Threshold I41 within the range 50% I41 to 90% I41, in 1% steps.
The prealarm condition deactivates in two cases:
IMPORTANT: the current selected from the menu must be
consistent with the size of the external toroid S.G.R.
: inverse time-delay dynamic trip
2
• current lower than prealarm threshold I41
• current higher than threshold I41
ABB | SACE Emax 2
Default
OFF
100 A
Default
OFF
ON
t = k
0,2 In
0,4 s
90 % I41
Continued on the next page
Ekip Touch - Protections
9 - Additional protections and functions