Study on Transient Electric Field of Insulated Rail Joints in High-speed Railway Stations Based on Dissado-Hill Model

doi:10.16182/j.issn1004731x.joss.25-0986

Abstract

Abstract:

The transient electric field distribution of insulated rail joints in high-speed railway stations under lightning impulse voltages is critical to their normal operation.Under lightning impulse voltages, considering the relaxation polarization of the insulated rail joint material, a frequency-domain mathematical model of its transient electric field was established. Based on Dissado-Hill model, the measured frequency-domain dielectric spectra were fitted and analyzed to reveal the microstructural characteristics of insulated rail joints and the interaction characteristics between microscopic particles during the polarization process. The results indicate that the relative permittivity of insulated rail joints decreases with the increasing harmonic frequency of the lightning voltage. The arrangement of charge carriers and dipoles within the insulated rail joints exhibits a relatively regular pattern. During the normal operation of the track circuit, the dielectric loss of the insulated rail joints is very low. Under lightning impulse voltages, the potential and electric field distribution of the insulated rail joints show a consistent trend with the variation of the applied excitation, both reaching peak values around 2.4 μs. Relaxation polarization has an insignificant effect on the overall potential and electric field distribution of the insulated rail joints, but its effect on the surface electric field intensity exhibits certain spatial variability and temporal dynamics.

Key words: insulated rail joints, transient electric field, lightning impulse voltages, relaxation polarization, Dissado-Hill model, high-speed railway

CLC Number:

TM852

Li Junli, Zhang Youpeng. Study on Transient Electric Field of Insulated Rail Joints in High-speed Railway Stations Based on Dissado-Hill Model[J]. Journal of System Simulation, 2026, 38(8): 2282-2293.

Figures/Tables 18

Fig. 1

Fig. 2

Fig. 3

Fig. 4

Table 1

Parameters of fitted Dissado-Hill loss peak model

$χ 1 (0)$	$ω p / H z$	n₁	m	G₁/pS
2.728 7	0.012	0.737 5	0.004 5	5.330 1

Table 1

Table 2

Parameters of fitted Dissado-Hill QDC model

$χ 2 (0)$	$ω c / H z$	n₂	p	G₂/pS
4.96	0.719 9	0.999 1	0.003	1.024

Table 2

Fig. 5

Fig. 6

Fig. 7

Fig. 8

Table 3

Fig. 9

Fig. 10

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Fig. 14

Table 4

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剖分方式	单元数	节点数
I	716 036	131 095
II	2 979 362	508 844
III	5 074 585	858 655

位置	电场强度/(kV/m)		差值/%
位置	考虑松弛极化	未考虑松弛极化	差值/%
M	1 246.4	1 190	4.46
N	993.14	1 064.87	-7.13
X	1 110.78	1 077.89	2.96
Y	1 235.86	1 261.76	-2.09