Nincs diac

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BUTE Part 1 Conducted and radiated disturbance
regulations for PLC devices
BUTE Part 2 Site Trial using the low voltage
feeder of RBS sited on HV power line tower
EPFL Part 3 Mitigation of electromagnetic field
radiated by PLC systems (in indoor environment)
János Löcher György Varjú BUTE
EPFL
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BUTE Part 1 Conducted and radiated disturbance
regulations for PLC devices
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IEC-61000-3-8 Signaling on low voltage electrical
installations
? Limits of mains terminal interference voltage
? No radiated interference limits apply below 30
MHz
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CLC/prTS504372004 Draft Technical Specification
for electromagnetic emissions fromaccess
powerline communications networks
? Limits of conducted common mode (asymmetric
mode) disturbances at network cables
? Limits of radiated disturbances from networks
cables
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ITU-T K.60 Emission limits and test methods for
telecommunication networks
? No conducted interference limits apply
? Limits for unwanted disturbance emissions from
telecommunication networks
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H-field limits converted to E-field using the far
field correction of 51.5 dB
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BUTE Part 2 Site Trial using the low voltage
feeder of RBS sited on HV power line tower
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Site Trial using the low voltage feeder of RBS
sited on HV power line tower
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Measuring concept
3 phase Low Voltage feeder PVC insulated phase
conductors wounded around a bare neutral
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System overview
Coupling PLT HE (capacitive, inductive) -
one, two or three phase to neutral - phase to
phase - any other combination PLT Modem (only
capacitive) - only phase to neutral Used
frequencyUpstream 13.8 16.3 MHz (512
carrier)Downstream 19 22.8 MHz (768
carrier) Injected signal levelmax. 30 dBm Data
transfer rateDownstream max. 27
MbpsUpstream max. 18 Mbps
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Characteristics to be measured

• K-factor measurement - H-field - Noise floor -
  Injected signal
• Ingression Noise
• LCL, TCL measurement - CM current
• Attenuation characteristics measurement
• Assessment of a technique to mitigate
  electromagnetic radiation from PLC

Note Regarding the measuring procedures, see
(JTA) EMC analysis of LF unstructured telecom
networks
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EPFL Part 3 Mitigation of electromagnetic field
radiated by PLC systems (in indoor environment)
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Mitigation of emissions
Injection of an auxiliary compensation signal)
EPLCVPLChPLC(f)
EcompVcomphcomp(f)
?
hPLC(f)
Vcomp hcomp(f) -VPLC hPLC(f)
hcomp(f)
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Classical Coupling of PLC Signals
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Antenna mode and TL mode Currents
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Mitigation

• Idea inject an auxiliary signal S2 into the line
  formed by the ground and the neutral conductors
• The auxiliary signal S2 has the same amplitude
  and waveshape as the original PLC signal S1, but
  with opposite polarity

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Proposed Coupling Power Splitter
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Bidirectional Data Transmission
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Test Configurations
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Measurements
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Measurement Results