Line Filters (Radio Frequency Interference (Rfi) Suppression Filter Or Emc Filter); General Information And Standards - Siemens SINAMICS G130 Engineering Manual

Fundamental Principles and System Description
Engineering Information
1.5.3

Line filters (radio frequency interference (RFI) suppression filter or EMC filter)

1.5.3.1

General information and standards

Line filters limit the high-frequency, conducted interference emitted by variable-speed drive systems in the frequency
range from 150 kHz to 30 MHz and therefore contribute to improving the Electromagnetic Compatibility (EMC) of the
overall system.
The electromagnetic compatibility describes - according to the definition of the EMC directive - the "capability of a
device to work satisfactorily in the electromagnetic environment without itself causing electromagnetic interference
which is unacceptable for other devices present in this environment".
To guarantee that the appropriate EMC directives are observed, the devices must demonstrate a sufficiently high
noise immunity, and also the emitted interference must be limited to acceptable values.
The EMC requirements for "Adjustable speed electrical power drive systems" are defined in the EMC product
standard EN 61800-3. A variable-speed drive system (or Power Drive System PDS) in the context of this standard
comprises the drive converter and the electric motor including cables. The driven machine is not part of the drive
system.
EMC product standard EN 61800--3 defines different limits depending on the location of the drive system and refers
to installation sites as "first" and "second" environments.
Definition of "first" and "second" environment
·
"First" environment:
Residential buildings or locations at which the drive system is directly connected to a public low-voltage
supply without intermediate transformer.
·
"Second" environment:
Locations outside residential areas or industrial sites which are supplied from the medium-voltage network
via a separate transformer.
Low-voltage
public network
Measuring point for
conducted
interference
First
environment
Equipment
(affected by
interference)
"First" and "second" environment as defined by EMC product standard EN 61800-3
Four different categories are defined in EN 61800-3 depending on the location and the output of the variable-speed
drive.
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Medium-voltage network
Conducted
interference
Second
environment
Limit of facility
Measuring point for
radiated interference
Low-voltage
industrial network
Drive (noise
)
source