Frequency Protections - ABB SACE Tmax XT2 User Manual

17 - Frequency Protections

List The Frequency protections available by default for Ekip Hi-Touch and Ekip M Touch models and
configurable on the remaining models as an additional software package, are:
Name
UF
OF
UF2
OF2
Function
UF Protection
If the grid frequency read by the Trip unit falls below the f12 threshold for a time greater than t12,
the protection sends the TRIP command.
The protection automatically cuts out if the maximum line-to-line voltage value is less than 30 V.
To verify and simulate the trip times based on all the parameters, see:


Parameters
Parameter
Enable
Trip Enable
Threshold
f12
Time t12
Constraints, limitations, and additional functions
From the service connector (with Ekip Connect) or with system bus communication it is also
possible to access the block functions, see page70.
1SDH002031A1002 ECN000092998
Type of protection
Minimum frequency
Maximum frequency
Minimum frequency
Maximum frequency
Protection summary table with the operating characteristics (page 79)
Chart with tripping curve (page 90)
Description
Enables/disables protection and availability on menu of the
parameters
Activates/deactivates the open command: if disabled, the alarm
and the lapsing of the protection time are managed only as
information
Defines the value that activates the protection.
The value is expressed both as an absolute value (Hertz) and as a
relative value (Fn), settable in a range:
0.9 Fn .. 1 Fn with 0.001 Fn step
This is the trip time of the protection; the value is expressed in
seconds, which are settable in a range:
0.06 s .. 300 s, with 0.01 s step
Rev. B
Page
54
55
55
56
Default
OFF
OFF
0.9 Fn
3 s
SACE Tmax XT2 – XT4 | 54