Novatech Bitronics 50 Series User Manual

ML0035 September 27, 2017 - 88 - Copyright 2017 Bitronics, LLC
6.11.4 Fundamental Voltage
Fundamental Volts are the nominal component (50/60Hz) of the waveform. The M650
measures the magnitude of the fundamental phase-to-neutral and phase-to-phase
volts. These measurements can be used in conjunction with the distortion
measurements to obtain the magnitudes of harmonics, in other words, convert from
percent to volts. This is simply done by multiplying the percent THD by the
Fundamental Volts for that phase (which is the denominator), and the result will be the
actual RMS magnitude of the selected harmonic.
Fundamental Volts and Amps can be used in conjunction to obtain Fundamental VAs,
and when used with Displacement Power Factor can yield Fundamental Watts and
Fundamental VARs.
6.11.5 K-Factor
K-Factor is a measure of the heating effects on
transformers, and it is defined in ANSI/IEEE C57.110-
1986. Equation 4 is used by the M650 to determine K-
Factor, where "h" is the harmonic number and "I
h
" is the
magnitude of the h
th
harmonic. K-Factor is measured on
each of the three phases of amps, however there is no
"Total" K-Factor. K-Factor, like THD and PF, does not
indicate the actual load on a device, since all three of
these measurements are ratios. Given the same harmonic ratio, the calculated K-
Factor for a lightly loaded transformer will be the same as the calculated K-Factor for a
heavily loaded transformer, although the actual heating on the transformer will be
significantly different.
6.11.6 Displacement Power Factor
Displacement Power Factor is defined as the cosine of the angle (phi) between the
Fundamental Voltage Vector and the Fundamental Current Vector. The sign
convention for Displacement Power Factor is the same as for Power Factor, shown in
Figure 9.
The Total Displacement Power Factor measurement is calculated using the "Power
Triangle", or the three-phase Fundamental WATTS divided by the three-phase
Fundamental VAs. The per-phase Fundamental VA measurement is calculated from
the product of the per-phase Fundamental Amp and Fundamental Volts values. The
three-phase Fundamental VA measurement is the sum of the per-phase Fundamental
VA values (Arithmetic VAs).
63
22
1
63
2
1
h
h
h
h
Ih
KFactor
I






Equation 4 - K-Factor

Novatech Bitronics 50 Series Specifications

General

Brand	Novatech
Model	Bitronics 50 Series
Category	Measuring Instruments
Language	English