General Aspects Of Harmonics Emission - GE AF-650 GP Design And Installation Manual

Installation Consideration
Voltage range: 200–240 V, 380–500 V
Basic standard
Acceptance criterion
Line
Motor
Brake
Load sharing
Control wires
Standard bus
Relay wires
Application and network
options
Keypad cable
External 24 V DC
Enclosure
7 7
AD: Air Discharge
CD: Contact Discharge
CM: Common mode
DM: Differential mode
1) Injection on cable shield.
Table 7.4 EMC Immunity Form

7.3 General Aspects of Harmonics Emission

A frequency converter takes up a non-sinusoidal current
from mains, which increases the input current I
sinusoidal current is transformed with a Fourier analysis
and split up into sine-wave currents with different
frequencies, that is, different harmonic currents I
Hz as the basic frequency:
Harmonic currents
Hz
Table 7.5 Harmonics Emission
The harmonics do not affect the power consumption
directly but increase the heat losses in the installation
(transformer, cables). So, in plants with a high percentage
of rectifier load, maintain harmonic currents at a low level
to avoid overload of the transformer and high temperature
in the cables.
Illustration 7.2 Harmonics
80
Burst Surge
IEC 61000-4-4 IEC 61000-4-5
B B
2 kV/2 Ω DM
4 kV CM
4 kV/12 Ω CM
4 kV/2 Ω
4 kV CM
4 kV/2 Ω
4 kV CM
4 kV/2 Ω
4 kV CM
2 kV/2 Ω
2 kV CM
2 kV/2 Ω
2 kV CM
2 kV/2 Ω
2 kV CM
2 kV CM
2 kV/2 Ω
2 kV/2 Ω
2 kV CM
0.5 kV/2 Ω DM
2 kV CM
1 kV/12 Ω CM
— —
. A non-
RMS
with 50
N
I I I
1 5 7
50 Hz 250 Hz 350 Hz
DET-767c All rights reserved.
ESD Radiated electromagnetic
IEC
61000-4-2 IEC 61000-4-3
B
—
1)
—
1)
—
1)
—
1)
—
1)
—
1)
—
1)
—
1)
—
—
8 kV AD
6 kV CD
NOTICE
Some of the harmonic currents might disturb communi-
cation equipment connected to the same transformer or
cause resonance with power factor correction batteries.
To ensure low harmonic currents, the frequency converter
is equipped with DC link coils as standard. This normally
reduces the input current I
The voltage distortion on the mains supply voltage
depends on the size of the harmonic currents multiplied
by the mains impedance for the frequency in question. The
total voltage distortion THD is calculated based on the
individual voltage harmonics using this formula:
2 2 2
THD % = U 5 + U 7 + ... + U
N
(U % of U)
N
RF common
field mode voltage
IEC 61000-4-6
A A
— 10 V
RMS
— 10 V
RMS
— 10 V
RMS
— 10 V
RMS
— 10 V
RMS
— 10 V
RMS
— 10 V
RMS
— 10 V
RMS
— 10 V
RMS
— 10 V
RMS
10 V/m —
by 40%.
RMS
MG35M402