Research on Rail Potential While Many Trains Are Starting at the
Same Time
Jie Hao
1, a
, Chuyan Xi
2, b
, Xinyuan Liu
1, c
, Huiping Zheng
1, d
, Ying Qu
1, e
and Yifan Zhang
1, f
1
State Grid Shanxi Electric Power Research Institute; QingNian rd. no.6;Taiyuan;China
2
State Grid Taiyuan Power Supply Company; BingZhou North Rd. NO. 89;Taiyuan;China
e
quying20090244@163.com,
f
358465506@qq.com
Keywords: Traction current; many trains; start; rail potential.
Abstract: The value of traction current affects rail potential. In real life, if many trains start at the same time, the traction
current may increase, and so is the rail potential. The excessive rail potential would seriously threaten people’s
lives. The paper states briefly that many trains start at the same time will increase the traction current and the
rail potential, and it is verified by the Matlab/simulink model and the field test data. Lastly, an optimization
measure of traction current based on locomotive schedule is proposed to reduce the rain potential.
1 UNTRODUCTION
The rapid development of urban rail transit brings a
lot of convenience to people. However, some new
problems such as stray current corrosion and high
orbital potential were on the way. Once the rail
potential is too high, people will have electric shock
hazard. Therefore, the reason of studying orbital
potential, which proposes the inhibitory measures of
orbital potential is particularly important.
Research shows the magnitude of locomotive
traction current can affects the height of orbital
potential. With larger locomotive traction current
comes higher orbital potential (YANG Gang, 2010).
In real life, different execution mode of locomotives
can affects the size of traction current. When the train
is in an accelerated stated, absorbing current from the
power grid. When multiple columns of locomotive
starts at the same time, also causes the increase of
traction current (WANG Jia, 2012).
2 UNDER CERTAIN CONDITION
OF MULTIPLE LOCOMOTIVES
START AT THE SAME TIME,
THEORETICAL
CALCULATION AND
ANALYSIS OF TOTAL
TRACTION CURRENT SIZE
Regard the time of the first locomotive left the
departure station as zero hour, set the traction current
which comes from the locomotive’s parking time at
each station are all zero seconds to i(t,0), where t is
the running time. According to the actual situation,
the duration of the locomotive’s stay at each station
can be adjusted (LI Guoxin, 2010). Assume the time
range of the locomotive’s adjustable action at the
No.m station is [a
m
, b
m
] seconds, the traction current
for the first vehicle at this time can be expressed as
11
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