36
AFQm
Instruction Manual
4�- OPERATION
4.1.- HARMONICS
Non-linear loads such as: rectifiers, inverters, variable speed drives, ovens, etc., absorb peri
-
odic non sine-wave currents from the mains.
These currents are composed of a fundamental frequency component, rated at 50 or 60 Hz,
plus a series of overlapping currents, with frequencies that are multiples of the fundamental
frequency; they are defined as
HARMONICS
.
+
+
=
Fundamental
Ware
50Hz
Harmonic ware
5th order 250 Hz
Harmonic ware
7th order 350 Hz
Distorted ware
Figure 30:Distorted wave shape decomposition�
The result is a deformation of the current and, as a consequence, of the voltage, causing a
series of associated side effects. These can be machinery overload, electric cable heating,
circuit breaker disconnection, damage to sensitive devices, etc.
Table 15: Frequency of each harmonic�
Order (n)
Mains frequency
Fundamental: 50 Hz
Fundamental: 60 Hz
3
150 Hz
180 Hz
5
250 Hz
300 Hz
7
350 Hz
420 Hz
...
...
...
4�1�1�- BASIC CONCEPTS
It is best to define some terms related to harmonics, fundamental for interpreting any
measurement and study:
Fundamental frequency (f
1
)
: Original wave frequency (50/60 Hz).
Order of a harmonic (n)
: A whole number given by the ratio between the frequency of a
harmonic and the fundamental frequency. The order determines the frequency of the harmonic
(E.g.: 5th harmonic → 5•50 Hz: 250 Hz)
Fundamental component (U
1
or
I
1
)
: A sine wave component of order 1 of the Fourier
frequency serial development equal to the original periodic wave.
Harmonic component (U
n
or
I
n
)
: A sine wave component of order over 1 of the Fourier
frequency serial development a whole multiple of the original frequency.
Summary of Contents for AFQm Series
Page 1: ...INSTRUCTION MANUAL Active Parallel Multi Function Filter AFQm M217B01 03 19B...
Page 2: ...2 AFQm Instruction Manual...
Page 103: ...103 Instruction Manual AFQm 608 812 1755 665 465 1890 Figure 98 Dimensions Cabinet type AFQm...
Page 105: ...105 Instruction Manual AFQm 14 CE CERTIFICATE...
Page 106: ...106 AFQm Instruction Manual...
Page 107: ...107 Instruction Manual AFQm...