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Abstract
The breakdown experiments were conducted on the castor oil and Midel 7131 nano-liquids under microsecond pulse. The breakdown strength of the castor oil nano-liquid with 1% volume fraction was over 50% higher than its base liquid, while the breakdown strength of the Midel 7131 nano-liquid with 0.3% volume fraction was 10% higher than its base liquid. A high viscosity base liquid would help increase the optimal volume fraction of the nano-particles because the nano-particles in a high viscosity liquid are harder to polymerize. This study proposed new ideas for the mechanism of nano-modification and extended the scope of liquid nano-modification.
Highlights
The important development direction of pulsed power technology is high power and compact structure
According to the typical breakdown voltage waveform, we set the ratio of the voltage increment and the voltage–resistance effective time of the liquid dielectric as the high-voltage increasing rate
The breakdown strength E can be calculated by the following formula: E = U/d, (1)
Summary
The important development direction of pulsed power technology is high power and compact structure. It has been reported that the nano-doping can increase the thermal conductivity and breakdown strength of the liquid dielectric.. In 1998, Segal carried out an experimental investigation on Fe3O4 modified transformer oil It shows that the nano-particles increased the breakdown voltage of the positive electrode by more than 50% under impulse voltage.. The mixture was poured into an agate pot and ground for 24 h; an evenly dispersed nano-liquid was obtained Using this approach, the castor oil nano-liquid with a volume fraction of 0.6%–1.4% and the Midel 7131 nano-liquid with a volume fraction of 0.05%–0.6% were prepared. According to the typical breakdown voltage waveform, we set the ratio of the voltage increment and the voltage–resistance effective time of the liquid dielectric (the duration of the voltage–resistance is greater than 63% of the peak voltage) as the high-voltage increasing rate. The high-voltage increasing rate used in our experiment is in the range of 3.5 kV/μs–7 kV/μs
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