User manual

UMG 96RM
8
General
THD
• THD(TotalHarmonicDistortion)isthedistortionfactorandprovidestherelationoftheharmonicpartsofanoscillation
to the mains frequency.
THD
U
U
U
fund
nHarm
n
M
=
=
∑
1
2
2
.
Distortion factor for the voltage
• M=40(UMG604,UMG508,UMG96RM)
• M=50(UMG605,UMG511)
• fundcorrespondston=1
Distortion factor for the current
• M=40(UMG604,UMG508,UMG96RM)
• M=50(UMG605,UMG511)
• fundcorrespondston=1
TH
D
I
I
I
fund
nHarm
n
M
=
=
∑
1
2
2
.
ZHD
• THDfortheinterharmonics.
• IscalculatedintheproductseriesandUMG511UMG605.
Interharmonics
• Sinusoidaloscillations,whichfrequenciesarenotamultipleintegerofthemainsfrequency.
• IscalculatedintheproductseriesandUMG511UMG605.
• CalculationandmeasurementmethodsinaccordancewiththeDINEN61000-4-30.
• Theordernumberofinterharmonicscorrespondstotheordernumberofthenextsmallestharmonic.Forexample,
between the 3rd and 4th harmonic of the 3rd inter harmonics.
TDD (I)
• TDDTotaldemanddistortion,harmoniccurrentdistor-
tion in % of maximum demand load current
• IL=
Maximum demand load current
• M=40(UMG604,UMG508,UMG96RM)
• M=50(UMG605,UMG511)
TD
D
I
I
L
n
n
M
=×
=
∑
1
100
2
2
%
Ripple control signal U (EN61000-4-30)
The ripple control signal U is a voltage (200ms measured value) which is measured at a carrier frequency specified by the
user. Only frequencies beneath 3kHz are observed.
Ripple control signal I
The ripple control signal I is a current (200ms measured value) which is measured at a carrier frequency specified by the
user. Only frequencies beneath 3kHz are observed.
xxx[0]=mainsfrequency(50Hz/60Hz)
xxx[1]=2ndharmonic(100Hz/120Hz)
xxx[2]=3rdharmonic(150Hz/180Hz)
etc.
Order number of harmonics