Instrumentation & Measurement Magazine 26-2 - 6

Table 1 - Electrical parameters of the catenary and the rail
Parameter Name
Contact wire model
Messenger wire model
Catenary
Equivalent radius of messenger
wire
Equivalent radius (Rεj
)
Resistance per unit length (RJ
Rail model
Rail
Equivalent radius
)
Parameter Value
GLCN-250
GJ-100
5.64 mm
8.92 mm
Parameter
Name
Permeability
Conductivity
Average distance between the
catenary and rail (h1
)
Average distance between the
catenary and roof (h2
)
0.149 mΩ/m -
60 kg/m
16.39 mm
Resistance per unit length
Distance between two rails
Table 2 - Electrical parameters of the transformer and TBs
The parameters of transformer
Value
Name
Rated capacity 50000 kVA
Rated voltage
Rated current
Load loss
No-load loss
Name
Short circuit
impedance
2×27.5 kV Resistance (Rs
)
909.08 A Impedance (Zs
146.49 kW
43.57 kW
)
Equivalent
inductance (Ls
-
In addition, in Fig. 4, the Rarc
)
Value
16.48%
0.18 Ω
9.97 Ω
31.75 mH
-
is a simplified model of the
PCA, which shows the position where the PCA is generated
in the common section. The PCA can occur anywhere on the
power supply line in this section.
Secondly, there will be a neutral section every 25 km on
the power supply line, which is used to change the phase of
the current. When the high-speed train passes through these
sections, the pantograph must be separated from the original
power supply line to drive
into the neutral line, and
then connected to the next
line, as shown in Fig. 5. In
this process, the PCA will
be generated, and the EMI
will be radiated. According
to the actual situation and
Fig. 5, a simplified model of
the train passing through
the neutral section is established,
as shown in Fig. 6.
As can be seen in Fig. 6,
the model includes the following
six parts:
◗ Part ① is the distributed
parameter model
6
Name
Single TB
resistance (RT
Single TB
inductance (LT
Connection
resistance
Grounding
resistance
-
)
)
The parameters of TBs
Value
Name
0.04 Ω
Conductivity
0.23 μH Permeability
0.01 Ω
Height
0.01 Ω Width
-
-
Value
2×107
S/m
4π×10−7
H/m
4.04 m
3 m
-
of the secondary side of the traction substation (the
A-phase).
◗ Part ② is the distributed parameter model of the catenary,
whose range is from the traction substation (the A-phase)
to the neutral line.
◗ Part ③ is the distributed parameter model of the sixteen TBs.
◗ Part ④ is the distributed parameter model of the neutral
line.
Parameter Value
4π×10−7
5.8×107
H/m
S/m
5.3 m
1.26 m
-
0.117 mΩ/m
1435 mm
Fig. 4. The model of the train passing through the common section.
IEEE Instrumentation & Measurement Magazine
April 2023

Instrumentation & Measurement Magazine 26-2

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