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Coupling Paths - Siemens SIROTEC Planning Manual

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3.3 Coupling paths

The coupling path is the transmission path for the noise levels generated by an
interference source. Through them, the noise levels can spread from the
interference source to the interference sink. Different coupling mechanisms exist
for the interference coupling:
Table 3-3
Coupling mechanisms and their typical interference sources
Coupling mechanism
Galvanic coupling
Interference
source
Conductive
coupling path
Interference
sinks
Capacitive coupling
Interference
source
Capacitive
coupling path
Interference
sink
Inductive coupling
Interference
source
Useful
Inductive
signal
coupling
path
Interference
sink
Radiation coupling
Interference
source
Radiated
coupling path
Interference
sink
© Siemens AG, 2004. All rights reserved
EMC Installation Guideline – Planning Guide (EMV) – 03.2004 Edition
Galvanic or metallic coupling
always occurs when two circuits
jointly use a conductor (e.g.
joint earth line).
Capacitive or electrical coupling
occurs between mutually
insulated conductors which are
on a different potential.
Inductive or magnetic coupling
occurs between conductor
loops of those at least one is
live. The magnetic flows linked
with the currents induce
interference voltages.
Radiation coupling is present if
an electromagnetic wave hits a
line formation. The hit of the
electromagnetic wave induces
currents and voltages.
Interference Spreading
Interference sources
• Cycled appliances (mains
influence by converter and
external power supply units)
• Starting motors
• Different potential of component
housings with common power
supply
• Interference coupling by parallel
running line
• Static discharge of the operator
• Contactors
• Transformers, motors, electrical
welding equipment
• Parallel running power line
• Lines with switched currents
• Signal line with high frequency
• Non-switched solenoids
• Adjacent transmitter (e.g. walkie-
talkies)
• Spark paths (spark plugs,
collectors of electric motors,
welding equipment)
3-17

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