CYG PRS-7367 - Protection Principle

Protection Functions
PRS-7367 151
Signal
Description
U3P
The voltage magnitude in all the three phases
I3P
The current magnitude in all the three phases
Blk
This signal blocks all the binary output signals of the function
Table 3.29-2 Output Signals
Signal
Description
Str
This is the integrated start signal
Op
This is the integrated operation signal.
3.29.2 32R Protection Principle
The reverse power protection function can be enabled or disabled by setting the corresponding
32R_Ena parameter values as "1" or "0".
The operation of the reverse power protection can be described by using a module diagram. All
the modules in the diagram are explained in the next sections.
The two-step protection logic is almost the same except for the individual settings, the functional
module diagram of step 1 is shown as below:
&
32R_Op
SIG
32R_Blk=1
SIG

1
20ms
32R_Op_T
SIG
32R_Str
ANA
P & Q
>32R_Pwr_Str
&
&
32R_Ena=1
SET
32R_Dir=1
SET
ANA
P & Q <-
32R_Pwr_Str
Figure 3.29-2 Functional module diagram
The power value is compared to the startup value setting. If the 32R_Dir is 1, the power value
exceeds the setting 32R_Pwr_Str, and if the 32R_Dir is 0, and the power value is less than the
negative setting; And then if there is no block signal is activated, the timer and 32R_Str signal are
activated.
Where:
32R_Ena can enable PWR 32R protection;
32R_StrVal is the power startup setting;
32R_StrAng is the power startup angle setting;
32R_Op_T is the operate time setting;
32R_Dir can switch the operation mode. 32R_Dir = 1 is recommended, which means the
system is operating in forward mode. On the contrary, 32R_Dir = 0 means the system is
operating in reverse mode.