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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 – PowerPoint PPT presentation

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Title: Nincs diac


1
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
2
BUTE Part 1 Conducted and radiated disturbance
regulations for PLC devices
3
IEC-61000-3-8 Signaling on low voltage electrical
installations
? Limits of mains terminal interference voltage
? No radiated interference limits apply below 30
MHz
4
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
5
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
6
H-field limits converted to E-field using the far
field correction of 51.5 dB
7
BUTE Part 2 Site Trial using the low voltage
feeder of RBS sited on HV power line tower
8
Site Trial using the low voltage feeder of RBS
sited on HV power line tower
9
Measuring concept
3 phase Low Voltage feeder PVC insulated phase
conductors wounded around a bare neutral
10
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
11
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
12
EPFL Part 3 Mitigation of electromagnetic field
radiated by PLC systems (in indoor environment)
13
Mitigation of emissions
Injection of an auxiliary compensation signal)
EPLCVPLChPLC(f)
EcompVcomphcomp(f)
?
hPLC(f)
Vcomp hcomp(f) -VPLC hPLC(f)
hcomp(f)
14
Classical Coupling of PLC Signals
15
Antenna mode and TL mode Currents
16
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

17
Proposed Coupling Power Splitter
18
Bidirectional Data Transmission
19
Test Configurations
20
Measurements
21
Measurement Results
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