Frequency Protections - ABB SACE Tmax XT7 Operation And Maintenance Manual

10 - Frequency protections

UF Protection
t
f12
t12
60 | © 2020 ABB | 1SDH001821A1002 - ECN000135670
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
UF
OF
UF2
(1)
OF2
(1)
(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
Function
The protection sends a TRIP command if the grid frequency read by the unit drops below threshold f12 for
longer than t12.
UF
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:
• summary table of the protections with the operating characteristics (page 88)
• the graph with trip curve (page 102)
Parameters
f
Parameter Description
Activates/deactivates the protection and its availability in the
Enable
parameters menu
Activates/deactivates transmission of the open command: if disabled,
Trip Enable the alarm and exceedance of protection time are only managed as
information
Establishes the value that activates the protection.
Threshold f12 The value is given as both absolute value (Hertz) and relative 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 seconds and
Time t12
can be set within a range: 0.06 s to 300 s, in 0.01 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 78).
Type of protection
Minimum frequency
Maximum frequency
Minimum frequency
Maximum frequency
ABB | SACE Tmax XT
Page
60
61
61
62
Default
OFF
OFF
0,9 Fn
3 s
Protections | 10 - Frequency protections