Streamer propagation times along insulator surfaces in transformer oil

<p>A summary of streamer propagation in Exxsol-D140 and Marcol-52 under various experimental conditions is given. The results are compared to those of cyclohexane and mineral transformer oil. Streamer propagation is polarity and liquid dependent. The breakdown and acceleration voltages are also governed by liquid chemistry. Reduced pressure largely enhances streamer propagation of both polarities. A low ionization potential additive significantly affects positive streamers while an electron scavenger markedly impacts negative streamers. Adding a low ionization potential additive caused positive streamers to behave like those in mineral transformer oil while adding an electron scavenger had the same influence on negative streamers. Processes at the streamer heads are suggested to be responsible for streamer propagation.</p>

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Effect of TiO2nanoparticles on streamer propagation in transformer oil under lightning impulse voltage

IEEE Transactions on Dielectrics and Electrical Insulation ◽

10.1109/tdei.2016.7556485 ◽

2016 ◽

Vol 23 (4) ◽

pp. 2110-2115 ◽

Cited By ~ 25

Author(s):

Yuzhen Lv ◽

Yang Ge ◽

Chengrong Li ◽

Qi Wang ◽

You Zhou ◽

...

Keyword(s):

Transformer Oil ◽

Impulse Voltage ◽

Streamer Propagation ◽

Lightning Impulse

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Modeling of Streamer Propagation in Transformer Oil-Based Nanofluids

2008 Annual Report Conference on Electrical Insulation and Dielectric Phenomena ◽

10.1109/ceidp.2008.4772777 ◽

2008 ◽

Cited By ~ 30

Author(s):

J. George Hwang ◽

Francis O'Sullivan ◽

Markus Zahn ◽

Olof Hjortstam ◽

Leif A. A. Pettersson ◽

...

Keyword(s):

Transformer Oil ◽

Streamer Propagation

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Finite Element Based Comparative Analysis of Positive Streamers in Multi Dispersed Nanoparticle Based Transformer Oil

International Journal of Engineering and Technology Innovation ◽

10.46604/ijeti.2021.7681 ◽

2021 ◽

Vol 12 (1) ◽

pp. 29-44

Author(s):

Mihir Bhatt ◽

Praghnesh Bhatt

Keyword(s):

Electron Density ◽

Dielectric Strength ◽

Space Charge Density ◽

Transformer Oil ◽

Ionization Region ◽

Streamer Propagation ◽

Positive Streamers ◽

Al2o3 Nps ◽

The Impact ◽

Positive Streamer

The dispersion of dissimilar nanoparticles (NPs) in transformer oil (TO) has a major impact on fast propagating positive streamers. This work investigates the positive streamer dynamics in TO modified by dispersing both Fe3O4 and Al2O3 NPs at a homogenous concentration. The hydrodynamic drift diffusion model of positive streamer evolution and propagation are solved using the commercial software package COMSOL Multiphysics. The impact of multiple NPs (MNPs) has been analysed for streamer propagation, electric field intensity, electron density, and space charge density of modified TO. MNPs successfully reduce streamer propagation velocity by 50%, 17%, and 37.5% comparing to pure oil, Fe3O4 based nanodielectric fluids (NDFs), and Al2O3 based NDFs, respectively. The spatial distribution of electron density reveals the loss of electrons from the ionization region until the saturation of NPs. A comparative study demonstrates that MNPs significantly alter the streamer dynamics and augment the dielectric strength of TO compared to individual NPs.

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