Considerations On The Full Scale Value Calculation - Algodue ELETTRONICA UPM209 Manual Del Usuario

Re g i ste r d es c ript io n
ENERGY COUNTER RECORDING PARAMETER BLOCK - ENH VERSION
-kvarh3-L • Phase 3 exported inductive reactive energy
+kvarh∑-C • System imported capacitive reactive energy
-kvarh∑-C • System exported capacitive reactive energy
+kvarh∑-L • System imported inductive reactive energy
-kvarh∑-L • System exported inductive reactive energy
kvarh∑BAL-C • Balance of system capacitive reactive en. (imp-exp)
kvarh∑BAL-L • Balance of system inductive reactive en. (imp-exp)
kvarh∑BAL • Balance of system reactive energy (BAL-C + BAL-L)

4.3 CONSIDERATIONS ON THE FULL SCALE VALUE CALCULATION

The full scale value calculation can change according to the instrument model (1/5A CT, 80A, Rogowski). The
following description shows the formulas for each model.
1/5A CT instrument
The phase power full scale is the result of a multiplication between PT primary and phase X CT primary (X=1, 2
or 3). If the PT primary and secondary values are set to 1 (direct connection), the phase power full scale is the
result of a multiplication between 290V and phase X CT primary (X=1, 2 or 3).
Example: formula for phase 1 power full scale
FS = PT * CT1
P1,S1,Q1 pri pri
The system power full scale is the result of a multiplication between 3 and PT primary and max phase CT
primary. If the PT primary and secondary values are set to 1 (direct connection), the system power full scale is
the result of a multiplication between 3 and 290V and max phase CT primary.
Example: formula for system power full scale
FS = 3 * PT * CT
P∑,S∑,Q∑ pri
80A instrument
The phase power full scale is the result of a multiplication between 290V and phase X CT primary (X=1, 2 or 3).
Example: formula for phase 1 power full scale
FS = 290V * CT1
P1,S1,Q1
The system power full scale is the result of a multiplication between 3 and 290V and max phase CT primary.
Example: formula for system power full scale
FS = 3 * 290V * CT
P∑,S∑,Q∑
Rogowski instrument
The phase power full scale is the result of a multiplication between PT primary and phase X current full scale
(X=1, 2 or 3). If the PT primary and secondary values are set to 1 (direct connection), the phase power full scale
Available only for ENH instrument version.
MODBUS RTU/ASCII, TCP
if PT =PT =1 > FS
pri sec
if PT =PT
priMAX pri
pri
priMAX
Value format
0.1 varh
0.1 varh
0.1 varh
0.1 varh
0.1 varh
0.1 varh
0.1 varh
0.1 varh
= 290V * CT1
P1,S1,Q1
=1 > FS = 3 * 290V * CT
sec P∑,S∑,Q∑
Words (IEEE)
2
2
2
2
2
2
2
2
pri
priMAX
85