Harmonic Mitigation Standards And Requirements; Application-Specific Requirements; Harmonic Mitigation Standards - Danfoss AHF 010 Design Manual

Introduction to Harmonics a...
The negative effect of harmonics is twofold
•
Harmonic currents contribute to system losses (in
2 2 cabling and transformer).
•
Harmonic voltage distortion causes disturbance
to and increases losses in other loads.
Non-linear
Current
Contribution to
system losses
Illustration 2.5 The Negative Effect of Harmonics
12
®
VLT Advanced Harmonic Filter AHF 005/AHF 010
System
Voltage
Impedance
Disturbance to
other users
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2.2 Harmonic Mitigation Standards and
Requirements
The requirements for harmonic limitation can be:
•

Application-specific requirements.

•
Requirements from standards that have to be
observed.
2.2.1 Application-specific Requirements
The application-specific requirements are related to a
specific installation where there are technical reasons for
limiting the harmonics.
Example
Two 110 kW motors are connected to a 250 kVA
transformer. One motor is connected direct online, and the
other is supplied through a frequency converter. If the
direct online motor should also be supplied through a
frequency converter, the transformer is, in this case,
undersized. To retrofit without changing the transformer,
mitigate the harmonic distortion from the 2 frequency
®
converters by using VLT Advanced Harmonic Filters
AHF 005/AHF 010.

2.2.2 Harmonic Mitigation Standards

There are various harmonic mitigation standards,
regulations, and recommendations. Different standards
apply in different geographical areas and industries. The
following encountered standards are presented:
•
IEC/EN 61000-3-2
•
IEC/EN 61000-3-12
•
IEC/EN 61000-3-4
•
IEC 61000-2-2
•
IEC 61000-2-4
•
IEEE 519
•
G5/4
MG80C602