ABB SACE Emax 2 Series Operating Instructions Manual page 91

MDGF Protection
t
I41
t41
88 | © 2023 ABB | 1SDH001330R1002 - ECN000297030
Continued from the previous page
Parameter Description
Activates/deactivates the function and selectivity time availability
on the display
ZoneSelectivity
stimulate inputs and outputs
This is the trip time of the protection with the zone selectivity
function activated and selectivity input not present
Selectivity time
The value is given in seconds and can be set within the range:
0.04 s to 0.2 s, in 0.01 s steps
Activates/deactivates the function and availability of the
StartUp enable
associated parameters on the display
Protection threshold valid during Startup time, in the conditions
StartUp
in which the function is activated
Threshold Value is given as both absolute value (Amperes) and relative value
(In) and can be set within range: 0.2 In to 1 In, in 0.02 In steps
This is the time for which the StartUp threshold remains
activated and is calculated from the moment the activation
StartUp Time
Threshold is exceeded
The value is given in seconds and can be set within the range: 0.1
s to 30 s, in 0.01 s steps
(1) details on page 83
(2) details on page86
Limitations and additional functions
• in the presence of curve t= k/I2, the protection trip time is forced to t41 if the calculation results
give a theoretical value lower than t41 itself
• Ekip Touch activates and displays Gext protection parameters if the presence of toroid S.G.R has
been enabled in the Settings menu (page 49);protection activation includes checking for the presence
of toroide S.G.R and signaling on the diagnosis bar in the event of alarm/absence
• the protection is automatically inhibited by the unit if absence of toroid S.G.R is detected
• the block functions and type of selectivity can also be accessed by means of the service connector
(via Ekip Connect) or communication via system bus (page 85)
• with CB in UL standard configuration, some parameters have different maximum values: I41
maximum = 1200 A, Startup maximum = 1200 A, t41 maximum = 400 ms
Function
MDGF protection protects against earth faults and detects the fault current with a dedicated toroid
MDGF.
MDGF
If the MDGF 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 104)
I
NOTE: Functionality valid from version FW Mainboard ≥3.23 and trip unit ≥4.04. Please
contact ABB for previous versions.
Parameters
Toroid configuration is available in the Settings menu (page 49)
Parameter Description
External Toroid It allows the presence of toroid MDGF to be activated
Visible if External Toroid parameter setting is ON.
Size of MDGF Toroid installed must be set.
MDGF in Size
Value can be set within the 100 A to lu value range, given in
Amperes and in 1A steps.
(1)
NOTES :
• the function is only available with curve t = k
• if at least two of the selectivity G, Gext and MDGF are
enabled, the input and output are shared with the OR
function; it is sufficient that even a selectivity is activated to
(2)
(1)
(2)
(2)
Continued on the next page
Ekip Touch - Protections
9 - Additional protections and functions
ABB | SACE Emax 2
Default
OFF
0,04 s
OFF
0,2 In
0.1 s
Default
OFF
Lu (given in
Amperes)