Protection Rocof - ABB SACE Emax 2 Series Installation, Operation And Maintenance Instructions

Protection ROCOF

t
f28
ROCOF
t28
118 | © 2013 ABB | 1SDH001000R0002 - L7804
Path
Main page - Menu - Advanced protections
Function
The protection ROCOF protects against rapid frequency variations.
When the frequency variation exceeds the control threshold f28, the protection trips within a
fixed time t28.
It is also possible to characterize the protection according to the way in which frequency varies
(increase or decrease), or to consider both conditions.
F
Figure 83
Parameters
It is possible to modify various parameters:
Parameter
Enabling
Threshold (f28)
Trip Direction
Time (t28)
Protection ROCOF has Trip Enable, see page 93.
f(Hz)
failure
50/60 Hz
Description
Activates/deactivates the protection.
It defines the maximum frequency variation allowed, which if
exceeded activates the protection.
It is represented as an absolute value (Hertz).
It defines whether the protection monitors increases, decreases, or
both variations.
This is the delay time between the exceeding of the f28 threshold
and the sending of the opening command
frequency
after failure
frequency
after failure
Time
Ekip Touch protection release | 13 - G Hi-Touch protections
ABB | SACE Emax 2