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This study describes the design and development of a 20 kV rated damped oscillating voltage (DOV) generator that can detect the partial discharge (PD) condition in 6/10 kV power cables. A complete system using a novel high-voltage switch consisting of a series of connected insulated gate bipolar transistors (IGBTs) is designed and tested. The switch consists of ten identical IGBT switch units, a multiple...
When electric field is measured in the bounded-wave EMP simulator experiment, one kind of optical fiber measurement system is often used. At the same time, the effect of optical transmitter on electromagnetic wave distribution is often concerned. In this paper, we assume that the optical transmitter is placed on the working region of the bounded-wave EMP simulator and the Finite-Difference Time-Domain...
The radiative device made of metal sheet is the key part of an EMP simulator with absorbing stuff. In order to extend the effective work space, the radiative device is designed optimised. And the finite-difference time-domain (FDTD) method is used to model electromagnetic field of effective work space of the EMP simulator accurately. From the numerical result, we can see that the optimised radiative...
Source charge model is reviewed and is used to analyze electric field changes caused by eight directions of lightning streamers. Moreover, an improved piecewise-linear source charge model combined with the three-dimensional radiation source mapping results to interpret electric field changes on the ground is proposed. This model is applied to simulating E-field waveform and calculating electric parameters...
The predigested physical model is set up in this paper according to the geometry shape of the earthing electrode, and the finite-difference time-domain (FDTD) method is used to get the transient grounding resistance (TGR) waveform of the earthing electrode, based on the experimental method. It is showed that the calculation results and the experimental results match well.
The influence of converse piezoelectric effect on the frequency of PZT cathode during the electron emission process was studied. The PZT cathodes were prepared by ordinary ceramic process and the diameter of PZT cathode is 25 mm as well as the thickness is 3 mm. The back electrode, whose diameter is 20 mm, and the grid electrodes, with intervals being 200 mum, were made of gold by using evaporation...
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