Protection Functions
36 PRS-7367
3.2.1.2 Signals
Table 3.2-1 Input Signals
The current magnitude in all the three phases
This signal blocks all the binary output signals of the function
This signal blocks all the start outputs of the function
This signal blocks all the trip signals of the function.
This signal enables the current multiplier.
Table 3.2-2 Output Signals
This is the integrated start signal
This is the start signal of phase A
This is the start signal of phase B
This is the start signal of phase C.
This is the integrated operation signal.
This is the operation signal of phase A
This is the operation signal of phase B
This is the operation signal of phase C
This is the integrated Alarm signal
3.2.2 50/51P Protection Principle
3.2.2.1 51P
Each stage of the protection function can be enabled or disabled by setting the corresponding
51P_Ena parameter values as "1" or "0".
The operation of the overcurrent protection can be described using a module diagram. All the
modules in the diagram are explained in the next sections.
 Initiation logic
The initiation logic diagram of the protection is as below:
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