Protection Functions
PRS-7367 95
3.15.1.1 Function Block
I3P
UVPR_27
Blk
Blk_Op
Blk_Str
Str
Op
Alm
U3P
Figure 3.15-1 The function block
3.15.1.2 Signals
Table 3.15-1 Input Signals
The voltage magnitude in all the three phases
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.
Table 3.15-2 Output Signals
This is the integrated start signal.
This is the integrated operation signal.
This is the integrated alarm signal
3.15.2 27 Protection Principle
The function can be enabled and disabled with the Operation setting. The corresponding
parameter values are "On" and "Off".
The operation of 27 can be described using a module diagram. All the modules in the diagram are
explained in the next sections.
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