Protection Functions
106 PRS-7367
3.19.1.1 Function Block
The function block of the protection is as below.
Figure 3.19-1 Function block
3.19.1.2 Signals
Table 3.19-1 Input Signals
The voltage magnitude in all the three phases
This signal blocks all the binary output signals of the function
Table 3.19-2 Output Signals
This is the integrated start signal.
This is the integrated operation signal.
3.19.2 81URS Protection Principle
The under frequency protection function can be enabled or disabled by setting the corresponding
81URS_Ena parameter values as "1" or "0".
The operation of under frequency protection can be described by using a module diagram. All the
modules in the diagram are explained in the next sections.
The functional module diagram is shown as below:
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