Instrumentation & Measurement Magazine 24-4 - 100

decreases. So, there is the highest overvoltage on the TBs with
the pantograph (02 TB, 07 TB, 10 TB, and 15 TB). Thus, the distribution
of TB voltage is extremely uneven because of the
overvoltage. The maximum TB voltage is nearly 700 V (on the
02 TB). However, the voltage on the 08 TB and 09 TB is much
less than on the other TBs, which is only around 50 V, as shown
in Fig. 6, because the overvoltage can be released by the protective
earthing installed between the 08 TB and 09 TB.
Measurement and Suppression of
Interference
Scenario and Results of the Measurements
The practical measurements are carried out at a high-speed
train station in China, which includes the TB voltage, signal
port voltage of the sensor, and the magnetic field around the
TBs. The pantograph on the
02 TB is separated from the
power supply line to produce
the PCA during the
measurements. The relative
specifications are listed
in Table 3.
Instruments
Name
The 02 TB voltage
is measured by a digital
multimeter, as shown in
Fig. 7a. The measurement
results show that the maximum
overvoltage of the
02 TB is 680 V at the moment
the pantograph is
separated from the power
supply line, which is consistent
with the previous
simulation results. The
measurement scenario is
shown in Fig. 7b. The results
show that there is a
magnetic field (roughly
58 dBμA/m) because of the
PCA, which can influence
the sensor signal.
The signal port voltage
of the TCU sensor is
measured by an oscilloscope
and the results are
described in Fig. 8a. At the
moment the pantograph is
separated, the signal port
voltage is approximately
2.6 V. In fact, there should
not be voltage on the sensor
signal port after the train
stops. The results show that
the signal of the sensor is
influenced by the PCA.
100
EMI receiver
Loop antenna
ESCI-3
HFH2-Z2
Digital multimeter VC890C
Oscilloscope
GDS-2302A
Fig. 6. Overvoltage from the PCA on 02 TB and 09 TB.
Table 3 - The specifications of measurement instruments
Specifications
Model
Name
Frequency range
Resolution ratio
Specification
Frequency range
Direct voltage
Alternating voltage
Frequency
Maximum sampling rate
Data
9 KHz ∼ 3 GHz
0.1 Hz
+30 ∼ -147 dBm
9 KHz ∼ 30 MHz
200 mV ∼1000 V
2 ∼750 V
500 MHz
5 Gsample/s
Fig. 7. Measurement scenario of 02 TB. (a) Test for TB voltage; (b) Test for magnetic field.
IEEE Instrumentation & Measurement Magazine
June 2021

Instrumentation & Measurement Magazine 24-4

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