Research On Time Domain And Time Domain Propagation Characteristics Of Electric Field Noise Radiated From Pantograph-catenary Arc

The pantograph-catenary arc generated due to the offline of the pantograph and catenary will radiate the wide-band electromagnetic noise into the outer space,which will cause interference to the GSM-R railway communication system and the electronic sensitive equipment near the railway.In order to study the suppression method of the electromagnetic noise produced by the pantograph-catenary arc,the electric field noise experiment under different experimental conditions was carried out by using the pantograph-catenary arc electromagnetic noise experimental platform,the time domain characteristics and time domain propagation characteristics of the electric field noise under different working conditions,load and no load,different power factors and different measuring distances were researched.The time domain waveform parameters of electric field noise under different working conditions,load and no load,and different power factors were statistically analyzed.The interference intensity of the electric field noise waveform under different experimental conditions was analyzed by using the peak-peak value and amplitude envelope of the electric field noise waveform.Segmentation fitting method was adopted to establish the mathematical model of the electric field noise time domain waveform,the validity of the mathematical model was verified by comparing the measured waveform and the fitting waveform under different experimental conditions.In order to accurately evaluate the electromagnetic environment and the interference level around the current-carrying sliding friction pairs,based on the radiation damping coefficient of electric field noise,the time-domain propagation characteristics of electric field noise were analyzed under different measure distances,different contact pressures,different contact currents and different sliding velocities.The radiation damping coefficient of electric field noise in the crest range of the pk₁-pk₁₅ is used to research the oscillation attenuation of the electric field noise waveform in the whole crest range,and the radiation damping coefficient in the crest range of the pk₁-pk₁₅ was used to analyze the speed of oscillation attenuation of the electric field noise waveform under different measuring distances and different working conditions.Finally,the mathematical model between the radiation damping coefficient of electric field noise and the measuring distance,the contact pressure,the contact current and the sliding velocity were established.The accuracy of the mathematical model was verified by the comparison between the measured values and the predicted values.