Special operation mode of high-speed railway will produce a large number of harmonics

and the harmon-ic will be traversed by the traction transformer into the main network 220 k V side

the main effect of the major net-work is worthy to make further studies and tests. Based on the harmonic data of the traction substation

the harmonicsource model based on the measured data is established. The influence of the high-speed railway harmonic on the220 k V side of the traction transformer is summarized by simulation. In this paper

based on the harmonic data m

ea-sured at traction substation

the harmonic source model is established. According to a lot of simulated results

the in-fluences of high-speed railway harmonics on 220 k V side of traction transformer are presented. When high-speed rail-way harmonics are transmitted to the 220 k V side

the effective value of each harmonic has different amplitude reduc-tion;and there are different changes in harmonic content

the third and fifth harmonic currents have increased

andthe 7

5

0 times odd harmonic current is reduced. When the difference between the phase of the T line harmonic cur-rent and the phase of the F line harmonic current is different

the effects on the 220 k V side are also different

andthe phase difference increased in the range of 10 degrees to 50 degrees

at the 220 k V side

the third

fifth and sev-enth the harmonic current content and total harmonic distortion rate are reduced

When the phase difference is in-creased from 50 degrees to 90 degrees

the third

fifth and seventh the harmonic current content and total harmonic dis-tortion rate of the 220 k V side increased. The results show that the method is simple and clear

and the calculation erroris within the allowable range

which has important reference significance for the high-speed railway harmonic control.