Page 60 - MCCB-XT5

ABB | SACE Tmax XT

5 - Frequency protections

List The Frequency protections, available by default for the Ekip Hi-Touch, Ekip G Touch, Ekip G-Hi Touch and
Ekip M Touch models and configurable in the remaining models as additional SW package, are:
Name Type of protection Page
UF Minimum frequency 58
OF Maximum frequency 59
UF2 (1) Minimum frequency 59
OF2 (1) Maximum frequency 60

(1) protections UF2 and OF2 are not available by default with Ekip G Touch. However, they can be
integrated by requesting the relative SW package

UF Protection Function
The protection sends a TRIP command if the grid frequency read by the unit drops below threshold f12
t for longer than t12.
UF
f12 The protection excludes itself if the maximum value of the line-to-line voltage is less than 30 V.
To check and simulate the trip times in relation to all the parameters, please consult:
t12 • summary table of the protections with the operating characteristics (page 82)
• the graph with trip curve (page 94)
f Parameters
Parameter Description Default
Activates/deactivates the protection and its availability in the
Enable OFF
parameters menu
Activates/deactivates transmission of the open command: if
Trip Enable disabled, the alarm and exceedance of protection time are only OFF
managed as information
Establishes the value that activates the protection.
The value is given as both absolute value (Hertz) and relative
Threshold f12 0,9 Fn
value (Fn) and can be set within the range: 0.9 Fn to 1 Fn in 0.001
Fn steps
This is the trip time of the protection; the value is given in
Time t12 seconds and can be set within a range: 0.06 s to 300 s, in 0.01 s 3 s
steps

Limitations and additional functions
The block functions can also be accessed by means of the service connector (via Ekip Connect) or by
connection to the system bus (page 76).

58 | © 2022 ABB | 1SDH002039A1002 - ECN000212994 Protections | 5 - Frequency protections