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Influence of Pantograph-Catenary Arc on Electromagnetic Disturbance of Airport Terminal Omnidirectional Beacon
Abstract
Three typical positions of high speed electrified railway were selected: neutral section, overlap and general point. Point frequency tests as well as the detection modes of peak, quasi peak and average value were adopted to carry out the electromagnetic radiation tests of contact loss arc between pantograph and catenary in the working frequency band of the airport terminal omnidirectional beacon station (TVOR). Taking an electrified railway vertically undercrossing the airport runway as an example, the influence of the contact loss arc between pantograph and catenary on the electromagnetic disturbance of TVOR was studied. Results show that the electromagnetic disturbance of the contact loss arc between pantograph and catenary at the neutral section is the maximum. At the frequency of 110 MHz, the value of the 10 m method of peak detection reaches 89.4 dBμV·m⁻¹. The electromagnetic radiation of the contact loss arc between pantograph and catenary at the positions of overlap and general point has no impact on TVOR. Even if the arcing point is located at the intersection of railway line and airport runway, the requirements for protection rate can still be met. The requirements for protection rate can only be met when the distance between the arcing point at the neutral section and the intersection of railway line and airport runway is greater than 236 m. The findings can provide the basis for the design of electromagnetic compatibility of airport regional rail traffic and airport aviation. © 2018, Editorial Department of China Railway Science. All right reserved.
With the increase of the speed of locomotives, the off-line discharge between the pantograph and catenary (PAC) occurs occasionally, which generates the electromagnetic disturbance. The main purpose of this paper is to study the electrical behaviors of the off-line discharge between the contact wire with a high current and the pantograph under their relatively high-speed motion, including the characteristics of the discharge voltage, current and electromagnetic disturbance. By analyzing the experimental data measured by an advanced high-power PAC equipment, two discharge forms were found macroscopically. Under different supply currents and speeds, the time and frequency domain characteristics of the discharge voltage, current and surrounding electric field were obtained. The main factors causing electromagnetic disturbance were discussed. Then from the perspective of the migration-diffusion motion of the particle, the main reasons for the pulsation of the discharge current during the PAC off-line were explained. Depending on the frequency distribution of the measured results, a 3D model was built for the research on the PAC off-line electromagnetic disturbance. And the variation laws of the electromagnetic field in the near and far field were got. The research results of this paper provide the references for the electromagnetic protection of the railway wireless equipment.
Approaching landing is the most difficult and complicated operation in the entire flight process of the aircraft, and it is also the stage where frequent flight accidents occur. According to the statistics released by International Civil Aviation Organization (ICAO), 49% of flight accidents occurred in the stage of approaching landing. The Instrument Landing System (ILS), commonly known as the blind landing system, is the main navigation equipment for guiding the aircraft's precision approach and landing in the terminal area of the airport. Therefore, the uninterrupted normal operation of the ILS is the key to ensuring the safety of aircraft landing.
When the pantograph of a high-speed train is separated from the power supply line, a panto-graph-catenary arc (PCA) occurs. This generates electromagnetic interference (EMI) and additional undesired effects on the electrical equipment (such as speed sensors) on the train. It creates a safety hazard for high-speed train operation. This article presents a new method for dealing with EMI caused by the PCA on speed sensors of high-speed trains. The proposed method consists of carrying out an in-depth analysis of the different coupling modes of EMI to identify the corresponding interference suppression measures. Thus, the safety of train operation can be ensured. By changing some relevant parameters, the proposed method can also be applied to other types of trains and electrical equipment.
High-speed trains close to airports emit electromagnetic radiation (EMR), which might interfere with the airport communication and navigation signals and create a safety hazard for the aircraft operation. Therefore, it is necessary to measure and evaluate the electromagnetic environment when building high-speed railway near the airport. In this paper, a new influence factor, train speed, is considered in the existing airport electromagnetic environment assessment system to make the evaluation result more reliable and real. We highlight the principles and results of the influence of train speed on the EMR from the high-speed train. Then, we present the corresponding train speed limit to mitigate the electromagnetic interference (EMI) of the nearby navigation station.
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