1-36
IM 253710-01E
Equation for the Distortion Factor «For procedures, see section 10.8.»
The measurement functions, Uhdf, Ihdf, Phdf, Uthd, Ithd, and Pthd of the harmonic
measurement mode have two defining equations. The appropriate equations can be
selected. For the equations, see Appendix 2.
Corrected Power «For procedures, see section 10.4.»
Depending on the applicable standard, when the load that is connected to the potential
transformer is extremely small, the active power of the potential transformer that is
measured need to be compensated. The compensating equation and the coefficient can
be selected.
IEC76-1(1976), IEEE C57.12.90-1993
IEC76-1(1993)
P
P
1
+ P
2
Urms
Umn
2
Pc =
P
Umn – Urms
Umn
1 +
Pc =
Pc : Corrected Power
P : Active power
Urms : True rms voltage
Umn : Voltage (rectified mean value calibrated to the rms value)
P
1
, P
2
: Coefficient as defined in the applicable standard
Re-computing the numerical data «For procedures, see section 10.1.»
With the data acquisition stopped, the measurement/computation period or numerical
computation setting can be changed for re-computation. All computations are performed
again including the measurement function data.
1.7 Numerical Computation