Protection Functions
PRS-7367 111
Valid duration time of operation for
under frequency protection
Block signal of the function
3.21 Frequency gradient protection 81R
3.21.1 81R Overview
This relay provides one-stage frequency gradient protection with independent definite time delay
characteristic.
The calculation of the frequency and frequency rate are based on the voltage sampled values.
3.21.1.1 Function Block
The function block of the protection is as below.
Figure 3.21-1 Function block
3.21.1.2 Signals
Table 3.21-1 Input Signals
The voltage magnitude in all the three phases
This signal blocks all the binary output signals of the function
Table 3.21-2 Output Signals
This is the integrated start signal.
This is the integrated operation signal.
3.21.2 81R Protection Principle
The frequency gradient protection function can be enabled or disabled by setting the
corresponding 81R_Ena parameter values as "1" or "0".
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