TITLE:
Grounding Impedance Measurement of High Speed Railway Integrated Grounding System
AUTHORS:
Zhang Yi, Jianguo Wang, Yadong Fan, Mi Zhou, Li Cai
KEYWORDS:
High-Speed Railway, Integrated Grounding System, Grounding Impedance
JOURNAL NAME:
Journal of Power and Energy Engineering,
Vol.3 No.4,
April
14,
2015
ABSTRACT:
The high-speed railway integrated grounding
system is the basic guarantee for the safe and stable operation of the railway.
It is the world’s largest long-distance horizontally elongated joint grounding
system, which stretches the length of hundreds to thousands of kilometers, and
its structure is not only different from power station and substation grounding
system, but also different from the transmission line tower, lightning rod and
other small grounding devices. There is little research information on the
grounding impedance of high-speed railway integrated grounding system. This
paper adopted 0.618 compensation method and reverse away method respectively,
measured a section of high-speed railway integrated grounding system grounding
impedance by JD16 and CA6425. Measurement results are in good agreement using
those two type instrument. By using 0.618 compensation method, the measurement
result will be gradually converged at 0.3 Ω with the increasing of current
electrode distance, which is the real grounding impedance of integrated
grounding system. By using reverse away method, the maximum measurement result
difference is less than 0.024 Ω with the lead of current electrode distance
increasing. The measurement results will be rapidly converged 0.25 Ω. The
results showed that the reverse away method is helpful to shorten the length of
current electrode wiring. The measurement error will be small when the current
electrode wiring is longer.