Cui Xiang

Analysis of Passive Interference on Radio Station from UHVDC Power Transmission Lines in Short-wave Frequency

The paper analyses passive interference on radio station from the +800kV UHV power transmission lines because of electromagnetic scattering on the UHV power transmission lines, overhead ground and iron tower caused by external electromagnetic field, with the moment method NEC programming based on wire antenna calculation theory. The conclusion has been obtained that passive interference on radio station is around 1dBmuV/m in 1MHz-30MHz and tabling the passive interference protecting distance proposes.

Modelling of planar EBG structure by using equivalent circuit method

A novel method based on equivalent circuit is presented to model and analyze the EBG(Electromagnetic Band Gap) structure of power planes. The planar EBG structure is divided into cells and connecting parts, the equivalent circuit is developed by combining the integral equation multi-port networks and the micro-strip transmission lines. The stop bandgap of the EBG structure is obtained by the circuit simulation. The proposed method is validated by both measurement and full-wave simulation, where the proposed EBG structure shows the stop bandgap at 0.7-3 GHz with less than -50 dB insertion loss.

Study on Location of All-Dielectric Self-Supporting Fiber-Optic Cable on High-Voltage Power Tower

ADSS (all-dielectric self-supporting) fiber-optic cable will be seriously damaged when it is located at the position of intensive electric field. Therefore, it is necessary to analyze the distribution of the electric field near the high-voltage power towers. By using method of moment (MoM), the electric field near some high-voltage power towers is calculated, and the location of ADSS fiber-optic cable is presented. Then the effect of the phase sequence of the transmission lines on the electrical fields is analyzed

A study on electromagnetic disturbance and immunity of wireless sensor unit in substation

Wireless sensor unit is important part of the Internet of Things, which is responsible for signal acquisition and transmission. In order to ensure reliability and security of the Internet of Things, electromagnetic disturbance issue in substation where wireless sensors are usually located is studied. This paper focuses on the electromagnetic disturbance to wireless sensor unit generated by power system and immunity of wireless sensor unit. Research on characteristics of steady-state electromagnetic disturbance in substations of different voltage levels and of different insulation types is performed, through field measurements. Statistical characteristics of electromagnetic disturbance in frequency domain are obtained, based on extensive field measurement data. Simulation is applied to reveal influence of electromagnetic disturbance to wireless sensor unit. Immunity of wireless sensor unit in the Internet of Things in substation is studied. Experiment indicates that wireless sensor unit is influenced by electromagnetic disturbance and immunity test of wireless sensor unit are performed.

Capacitive coupling analysis of TSV array in 3D packaging

In 3D-TSVs (through silicon vias) interposer layer, the capacitive coupling effects of TSV array are modeled and analyzed for signal transmission. To consider the semiconductor characteristics, the multi-conductor model is presented to model the TSV array by combining the MOS capacitance with the passive RLGC parameters. After that, the values of MOS capacitance and RLGC are extracted. Finally, by using model order reduction, the capacitive coupling characteristic of TSV array is simulated and analyzed for the signal transmission.

Calculation and Research of Electromagnetic Fields in Space Around Lightning Path with finite difference time domain method

In this paper, numerical calculation method based on analytical formulas and FDTD are studied. A physical model for nature lightning is built in this paper, the lightning channel as a long ling wire, lightning current s double exponential pulse time domain waveform. The numerical method from dipole formula is obtained by scattering lightning current at time and space, With finite difference time domain(FDTD) method, lightning space is dispersed and electromagnetic fields for whole free space are solved, with the computer program, the results are consistent with results of references and simulating test.

Numerical analysis of the influence of the surrounding buildings on the performance of a grounding grid

By the use of numerical method, the influence of the surrounding buildings on the performance of a real small testing grounding grid is researched. Experiments have been done to verify the numerical method. The performance of the grid considering the surrounding buildings is compared with that not considering the surrounding buildings. From the experiments and the calculation, it can be seen that the influence of the surrounding buildings is very small. Both the method and the results are useful for designing the grounding grids of the substations in city.