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Novel Simulation Technique of Electromagnetic Wave Propagation in the Ultra High Frequency Range within Power Transformers.pdf


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FOR PEER REVIEW
Sensors 2018, 18,
18, x4236

3 of3 of
16 16

from the monopole antenna and detected by these UHF sensors were digitized and recorded by an
(top
portion(LeCroy,
of the sensors)
100
mm NY,
intoUSA,
the tank,
results20inGS/s)
a high
sensor
oscilloscope
WaveProwere
7300,inserted
Chestnut
Ridge,
3 GHzwhich
bandwidth,
without
sensitivity
and
is
suitable
for
the
comparisons
with
the
simulated
results.
EM
wave
signals,
radiated
any analog filter and amplifier.
fromAthe
monopole
antenna
these
UHFinsensors
were
by an
monopole
antenna
of 20and
mmdetected
in lengthby
and
1.3 mm
diameter
wasdigitized
used as anand
EMrecorded
wave source,
oscilloscope
(LeCroy,
7300,
Chestnut Ridge,
NY, USA,
3 GHz
20 GS/s)
without
instead
of a typical
PDWavePro
source (e.g.,
a needle-plane
electrode
system)
sincebandwidth,
it radiates stable
EM waves
any analogamplitudes
filter and amplifier.
regarding
and frequency spectra. The antenna was excited by a voltage pulse generator
A Engineering,
monopole antenna
of 20 mmLDC-7/UHF,
in length andWatertown,
1.3 mm in diameter
was
used as
an Ω
EM
wave cable
source,
(Doble
UHF calibrator
MA, USA)
through
a 50
coaxial
instead
of a typical
PDmm
source
(e.g.,The
a needle-plane
electrode
system)
since itwas
radiates
of
approximately
2000
length.
output voltage
of the pulse
generator
set to stable
60 V. EM waves
In theamplitudes
first experiment,
time-domain
signals
cumulative
energies
the EM
waveforms
regarding
and frequency
spectra.
The and
antenna
was excited
by a of
voltage
pulse
generator
detected
by the four UHF
were
evaluated toWatertown,
validate theMA,
modeling
of antenna,
signal
(Doble
Engineering,
UHF sensors
calibrator
LDC-7/UHF,
USA) through
a 50exciting
Ω coaxial
cable
and
the transformer
tank
in length.
the EM The
wave
simulation.
of approximately
2000
mm
output
voltage of the pulse generator was set to 60 V.

1720
Sensor B

Sensor C
DN80 gate valve

100

160

140

1270

760

Monopole antenna
(EM wave source)
115

115

DN50 gate valve
Sensor D

Sensor A
(a) Top view

1720

130

Sensor A
Coaxial cable

200
1000

115
140

Sensor C
1550

Sensor B
160
200

115
90

Sensor D

Monopole antenna
(EM wave source)

(b) Side view
Figure 1.
1. Schematic
Schematicdiagram
diagramofofaatransformer
transformertank
tankand
andantenna
antennapositions
positions(for
(for
the
first
experiment).
Figure
the
first
experiment).