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This paper analyzed the electromagnetic disturbances in the driving system of a fuel cell bus. First, the distribution of the disturbance source in the driving system surveyed by measurement was introduced. Then, the characteristics of the conductive emission were presented. Based on the multiconductor transmission line model, the paper analyzed the electromagnetic conductive interference in the driving...
As part of its commitment for entry into WTO in December 2001, China started the Compulsory Product Certification System on Dec 7, 2001 to unify the technical regulations, certification standards and conformity assessment, and published First Catalogue of Products Subject to Compulsory. This presentation summarizes EMC development in China. It discusses the status of EMC standards, test requirements,...
Load effect of our developed reverberation chamber is investigated at calibration stage. The influence of receiving antenna, transmit antenna and EUT is analyzed and evaluated according to the measurement data. Load effect calibrations with different receiving antenna positions, transmit antenna positions, and EUT positions are measured carefully. It is indicated that transmit antenna positions, and...
Transient processes are generated by operations of disconnect switches and circuit breakers in the AC side of converter stations. Several trips in different plusmn500-kV HVDC converter stations in china happened recently. Characteristics of transient Electromagnetic Interference due to switching operations are summarized based on onsite tests in a practical converter station. Measurements are performed...
The electromagnetic transients of lightning protection system (LPS) under direct lightning strike is studied using NEC2. By employing antenna return-stroke model, lightning channelpsilas inducing effect and finite conductivity of ground are all taken into account. Results show that the lightning channelpsilas inducing effect tends to decrease the current flowing through horizontal conductors, and...
In order to meet the demands of lightning impulse electric field measurements in power system EMC, the design of an electro-optic integrated sensor is presented in this paper. The disadvantage of the Mach-Zehnder structure of the sensor is analyzed, and a novel structure is proposed to solve the problem. The sensor system is established and the calibration of the sensor is carried out. A maximum linear...
This paper analyzed the distribution and the characteristic of the disturbances in the driving system of a fuel cell bus by measuring both the conductive and radiative emission. Statistical method was used to investigate the parameters of the typical voltage waveforms, which were compared with the standard ones in IS07637-2. The results are useful for the farther investigation of the EMC problems...
The electro-optical modulator based on Pockels effect implements the transition from electrical signal to optical signal. This makes using optical fiber in EMC measurements come true. This paper describes the principle of modulators based on Pockels effect, designs the modulator with high precision, calculates the electric field in the modulator, discusses the parameters of the modulator, and gives...
Hybrid electric Bus has serious EMC problems. Normal distribution is proved suitable to describe the noise fluctuation on input port of inverter. Typical noise patterns are summarized with seven key parameters. Then crosstalk between power cables and nearby signal cables is analyzed with injection of these typical noises. Time parameters of noises are observed can influence the crosstalk significantly...
Fuel cell vehicle would cause serious EMC (electromagnetic compatibility) problems. Now the related EMC research is being focused on. Up to now, there still have been no expert EMC standards on it. So it is necessary to realize the characteristics of the disturbance source on the new type of fuel cell vehicle. This paper applied statistical methods to analyze the conducted disturbance sources on fuel...
Reverberation chambers are used widely for EMC testing in industry. The design of the mechanical stirrer should be considered artistically. This paper introduces a split stirrer design, the simulation result shows the good performance of this stirrer and a prototype chamber is built according to the simulation. The critical parameters of the reverberation chamber are analyzed in detail. Four calibrations...
Hybrid electric vehicle has serious EMC problems. In this paper, with modeling of driving system, the conducted electromagnetic disturbance is analyzed. The parameters are obtained by experiments of system impedance. Affections to the noise patterns caused by major parameters in the model are compared
Fuel cell vehicle and hybrid electric vehicle are prospective new automotive technologies, but they may cause serious EMC problem. This paper gives the impedance characteristics of the power cables on the real chassis in the driving system by measurement. An equivalent circuit model is set up to describe the distribution parameters of the power cables. Impedance characteristics of cables on different...
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