Neptune RM-12P - Page 15

INTELLIGENT REACTIVE POWER MANAGEMENT
RM-12P
13
In this menu, voltage transformer ratio is set between 1-2000.
For example: For 34,5 kV / 100 V transformer, VT ratio must be set as 345.
Note : Take care that this value must be ratio but not VT primary or
secondary value.
3.7.b Voltage Transformer Ratio Setting
By UP/DOWN buttons, find voltage transformer ratio (Vtr) menu.
Press SET button to set VT ratio.
Enter VT ratio between 1-2000 and press SET button. If you do not want
to set another parameter, press ESC button.
SAUE
If you do not want to set another parameter, in order to quit from the
menu, press ESC button one by one until SAVE SEt yES is displayed.
Press SET button to save your changes or press ESC button to quit
without saving.
3.7.c Reactive Energy Calculation Method Setting
Three different methods exist for reactive energy calculation in RM-12P.
Brief informations about these methods are explained in below table.
Related values which must be entered in the menu are also indicated in
the table in order to select reactive power calculation methode for mechanical
and digital energymeters.
By UP/DOWN buttons, find reactive energy calculation method (CALC).
Press SET button to select calculation method.
In order to select reactive energy calculation method (for mechanical and
digital energymeter), enter a value between 0-5 and press SET button.
If you do not want to set another parameter, press ESC button.
SAUE
If you do not want to set another parameter, in order to quit from the
menu, press ESC button one by one until SAVE SEt yES is displayed.
Press SET button to save your changes or press ESC button to quit
without saving.
0
2
4
1
3
5
Description
It is the most preferred reactive power calculation
methode.
Total value of the multiplication of V
n
and I
n
values up
to 19 th harmonics. This calculation method is mostly
preferred for network analysers.
S V n .I n .sin(j n )
n=1
¥
Reactive Energy
(Q)
Digital Energymeter
(Each phase separately)
Mechanical Energymeter
(Vectorel summation of 3-phase)
90° rotation of
voltage vector and
multiply with current
S
2
-P
2
S
2
-P
2
Power Triangle Method : According to this method;
Q =
(Q : Reactive power, S : Active power, P : Apparent power)