Ultra wideband measurements of partial discharges in air and insulating oil

Levy, Andrew; Filho, Oswaldo Baffa; Olivieri, Marco

doi:10.1109/icdl.1996.565430

Cited by 3 publications

(2 citation statements)

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“…Here Cb. 5 and Cb.2 ( Figure 3) are capacitances of the 500 kV b u s h g and the 220 kV bushing, respectively. The PD current responses passing through the grounding of the transformer can be monitored.…”

Section: Pd Propagation In the Simplified Networkmentioning

confidence: 99%

“…Experiments show that the real PD current pulse can be represented by a double-exponential function [5] assuming that the rise time of the current pulse is 5 ns, the fall time is 50 ns, and the rise time of the voltage pulse is 0.1 ps, an iteration algorithm is used to obtain the waveform of PRO PAGAT I 0 N used to simulate the PD source. the voltage pulse u(t) [3].…”

Section: Pd Source Modelsmentioning

confidence: 99%

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Simulation of transformer PD pulse propagation and monitoring for a 500 kV substation

Xiang

Zhu

Wang

et al. 1999

IEEE Trans. Dielect. Electr. Insul.

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This paper discusses the development of a simulation model to study the propagation of partial discharge (PD) pulses of transformers in a 500 kV substation. The results will be used to design an on-line PD monitoring system for transformers. The impedance matrix of a 500 kV, singlephase transformer is computed based on geometry data and its external coupling network (often referred to as coupling impedance) is calculated with electromagnetic transients program (EMTP). It was found that the frequency characteristic of the coupling network is complex and that the traditional lumped coupling capacitance representation is only feasible at t60 kHz. The entire substation network was included to calculate the PD propagation of the transformer. PD responses are obtained at the tank grounding and 500 kV bushing tap grounding with a simulated PD pulse injected at the 500 kV terminal and 220 kV terminal of the transformer, respectively Simulation shows that, using the resonant frequency of the substation network as monitoring frequency, one effectively can increase the monitoring sensitivity. The off-line and online PD calibration also can be made based on the developed simulation model. 1070-9878/99/ $3.00 0 1999 IEEE

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Section: Pd Propagation In the Simplified Networkmentioning

confidence: 99%

Section: Pd Source Modelsmentioning

confidence: 99%