KMB NOVAR-1 Series, Operating Manual

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Novar 1xxx KMB systems
60
6. Novar-1414 Description
6.1 Basic Operation
Despite of other models, this controller model has three current measurement inputs ( one voltage
measurement input only stays unchanged ). It is capable to measure load of all three phases and
evaluates three-phase power factor for the control. Therefore, it is suitable especially for applications
with great or variable load unbalance.
The following section of the manual therefore only deals with features and operations different from
Novar1214. The other features are the same as those of Novar1214.
6.2 Measurement Values
The controller measures current in all three phase wires and evaluates appropriate phase power
factors. But one (phase or line) voltage signal is measured only – therefore it supposes that other two
voltages magnitudes are the same.
From individual phase power factors it calculates three-phase power factor, that is essential for power
factor control.
6.2.1 Main Branch
Main network values according the table 6.1 can be listed on the instrument display.
Tab. 6.1 : List of the Novar-1414 Measurement Quantities – Main Branch
abbreviation quantity unit
cos Instantaneous power factor. The value corresponds to the ratio of
instantaneous active component to instantaneous total power
fundamental harmonic value in the power system. A positive value
means inductive power factor, negative means capacitive power factor. -
Ieff Average value of instantaneous current effective values I1, I2, I3
(including higher harmonic components). A / kA *
Ueff Instantaneous voltage effective value in the power system (including
higher harmonic components). By default shown in volts. If the
measurement voltage is connected via a metering transformer, in
kilovolts (see description of parameter 17). V (kV)
* … in A as default; flashing decimal point indicates value in kA
Despite of other models, the Ieff value in the main branch contains average value of instantaneous
currents of individual phases L1, L2 and L3 according to formula
I
eff
=
3
I3 I2 I1
eff eff eff
+ +
[ A ] [ 6 ]
6.2.2 COS Branch
Additional individual single-phase power factors cos1 , cos2 a cos3 can be checked in „the Cos“ side
branch. Other quantities are the same as at standard models.