ABB | SACE Emax 2
Ekip Touch protection trip unit | 13 - G Hi-Touch protections97 | © 2017 ABB | 1SDH001330R0002 - ECN000058721 Rev. A
ROCOF Protection
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Function
ROCOF protection protects against rapid frequency variations.
When the frequency change exceeds the control threshold f28 over time, 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(Hz)
Time
failure
50/60 Hz
frequency
after failure
frequency
after failure
Figure 25
NOTE: the protection is not active for voltages <30V.
Parameters
It is possible to modify various parameters:
Parameter Description
Enable To activate/deactivate the protection.
Threshold f28
It defines the maximum allowed frequency variation rate over time, above which
the protection will be activated.
It is represented as an absolute value (Hertz / second).
Trip Direction
It defines whether the protection monitors increases, decreases, or both
variations.
Time t28
This is the delay time between the exceeding of the f28 threshold and the
sending of the opening command
ROCOF protection has StartUp enable, see page 71.
Via Ekip Connect it is also possible to access the blocking functions, see page 72.
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