CYG PRS-7367 - Positive sequence overvoltage protection 59 P

Protection Functions
88 PRS-7367
U3P
59P
Blk
Blk_Op
Blk_Str
Str
Op
Figure 3.12-1 Function block
3.12.1.2 Signals
Table 3.12-1 Input Signals
Signal
Description
U3P
The voltage in all the three phases
Blk
This signal blocks all the binary output signals of the function
Blk_Str
This signal blocks all the start outputs of the function
Blk_Op
This signal blocks all the trip signals of the function.
Table 3.12-2 Output Signals
Signal
Description
Str
This is the integrated start signal
Op
This is the integrated operation signal.
3.12.2 59P Protection Principle
The positive-sequence overvoltage protection function can be enabled or disabled by setting the
corresponding 59P_Ena value as "1" or "0".
The operation of the positive-sequence overvoltage protection can be described using a module
diagram. All the modules in the diagram are explained in the next sections.
The functional module diagram is shown as below:
&
U1>59P_Vol_Str
ANA
SIG
59P_Op
SIG
59P_Str
SIG
59P_Blk
&
&
SIG
59P_Blk_Str=1
59P_Ena=1
SET
SIG
59P_Blk_Op=1
30ms
59P_Op_T
Figure 3.12-2 Functional module diagram
The calculated positive-sequence voltage is compared to the set 59P_Vol_Str setting. If the value
exceeds the set 59P_Vol_Str and no block signal is activated, the timer and 59P_Str signal are