ABB | SACE Tmax XT
Protections | 12 - ROCOF protections
69 | © 2020 ABB | 1SDH001821A1002 - ECN000135670
12 - ROCOF protections
The ROCOF Protection package is available by default for Ekip G Hi-Touch and configurable in the remaining
models as additional SW package
The protection is described below:
ROCOF Protection
f28
t
t28
Hz/s
ROCOF
Function
ROCOF protection protects against rapid frequency variations: the protection sends a TRIP command if the
frequency changes faster than control variation f28 set in the unit for longer than t28.
f(Hz)
Frequency fluctuation
(after a failure)
Frequency variation
after failure
(1)
t
28
t
(s)
f
28
f
mis
Figure 30
(1)
example with positive linear variation of the higher frequency of the set f28 value; the protection also
manages negative variations
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 89)
• the graph with trip curve (page 106)
Parameters
Parameter
Description
Default
Enable
Activates/deactivates the protection and its availability in the parameters
menu
OFF
Trip Enable
Activates/deactivates transmission of the open command: if disabled, the
alarm and exceedance of protection time are only managed as information
OFF
Threshold f28
establishes the maximum admissible frequency variation rate over time; the
protection trips if this rate is exceeded.
The value is given as absolute value (Hz/s) Fn) and can be set within the
range: 0.4 Hz/s to 10 Hz/s in 0.2 Hz/s steps
0,6 Hz/s
Trip Direction
Establishes whether the protection monitors an increase (
Up
), a decrease
(
Down
) or both variations (
Up
and
Down
)
Up or Down
Time f28
This is the trip time of the protection; the value is given in seconds and can
be set within a range: 0.06 s to 300 s, in 0.01 s steps
0,5 s
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).
Содержание XT7
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