Offline can occur in any time of the AC voltage due to the pantograph-catenary offline randomness of the high-speed railway

influence of offline time on the characteristic of pantograph-catenary offline arc should be researched so that the mechanism of the offline arc can be studied systematically. Consequently

based on the pantograph-catenary offline simulation experiment platform that is set up in the lab

a large number of random offline discharge experiments are conducted. The waveforms and data of the voltage

current

and relative light intensity of the arc in different offline time are collected

thereby

the characteristics of the offline arc are statistically analyzed. The results show that

under the circumstance of static pantograph-catenary offline

the arcing time is

between 15 ms and 25 ms and when the offline occurs in the rising section of the voltage amplitude（1

5

ms

11

1

5 ms）

not only the relative light intensity of the arc is stronger

but also the harmonics content of the voltage are more abundant. On the other hand

under the circumstance of dynamic pantograph-catenary offline

the arcing time is between 1 ms and 8 ms and when the offline occurs in the rising section of the voltage

the arcing time is shorter and the harmonics content of the voltage amplitude is lower than those in the dropping section. In conclusion

the static and dynamic pantograph-catenary offline has different degrees of influence on the electrical characteristics

arcing time

relative light intensity and harmonic content of the arc respectively.