CYG PRS-7367 - Settings

Monitoring & Control
254 PRS-7367
are displayed in HMI with 0.5s updating rate.
Parameter setting of AC measure quantity contains the following items:
Here is the calculation theory of measurement voltage U and current I,
N
is the sampling rate of
measurement:
2
1
1
()
N
n
U U n
N



2
1
1
()
N
n
I I n
N



The active power and reactive power can be calculated by voltage U and current I, the current
phase number can be set to two or three according to the project requirements, the calculated
formula is different as following:
(1)
P
,
Q
Active/Reactive power calculated by three-meter method
1
[ ( ) ( ) ( ) ( ) ( ) ( )]
a a b b c c
P U n I n U n I n U n I n
N
  
1 3 3 3
[ ( ) ( ) ( ) ( ) ( ) ( )]
4 4 4
a a b b c c
Q U n I n N U n I n N U n I n N
N
     
(2)
P
,
Q
Active/Reactive power calculated by two-meter method
       
 
nInUnInU
N
P
ccbaab

1
   






 )
4
3
()
4
3
(
1
NnInUNnInU
N
Q
ccbaab
The power factor
cos
can be calculated by P and Q as following formula:
22
cos
P
PQ


5.3.3 Settings
Table 5.3-1 Parameter Setting of AC Measure Quantity
NO
Name
Range
Unit
Default
Description
0
READ_ZONE
0~100%
~
0.2%
Dead zone value of