Effects of Temperature Gradient on Electrical Tree Growth and Partial Discharge in Silicone Rubber Under AC Voltage

This study investigated electrical treeing and its associated phase-resolved partial discharge (PD) activities in room-temperature, vulcanized silicone rubber/organomontmorillonite nanocomposite sample materials over a range of temperatures in order to assess the effect of temperature on different filler concentrations under AC voltage. The samples were prepared with three levels of nanofiller content: 0% by weight (wt), 1% by wt, and 3% by wt. The electrical treeing and PD activities of these samples were investigated at temperatures of 20°C, 40°C, and 60°C. The results show that the characteristics of the electrical tree changed with increasing temperature. The tree inception times decreased at 20°C due to space charge dynamics, and the tree growth time increased at 40°C due to the increase in the number of cross-link network structures caused by the vulcanization process. At 60°C, more enhanced and reinforced properties of the silicone rubber-based nanocomposite samples occurred. This led to an increase in electrical tree inception time and electrical tree growth time. However, the PD characteristics, particularly the mean phase angle of occurrence of the positive and negative discharge distributions, were insensitive to variations in temperature. This reflects an enhanced stability in the nanocomposite electrical properties compared with the base polymer.

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Electrical treeing and partial discharge characteristics of silicone rubber filled with nitride and oxide based nanofillers

International Journal of Electrical and Computer Engineering (IJECE) ◽

10.11591/ijece.v10i2.pp1682-1692 ◽

2020 ◽

Vol 10 (2) ◽

pp. 1682

Author(s):

A. H. M. Nasib ◽

M. H. Ahmad ◽

Z. Nawawi ◽

M. A. B. Sidik ◽

M. I. Jambak

Keyword(s):

Tree Growth ◽

Silicone Rubber ◽

Partial Discharge ◽

Filler Concentration ◽

Weight Percentage ◽

Electrical Tree ◽

Power Frequency ◽

Sio2 Nanocomposites ◽

Electrical Treeing ◽

Better Than

This article presents a study on electrical treeing performances with its associated partial discharge (PD) and the influence of filler concentration in silicone rubber (SiR) samples which are filled with silicon dioxide (SiO2) and silicon nitride (Si3N4) as nanofillers for electrical tree growth suppression. There are many researches on electrical treeing in SiR with SiO2 nanofillers but none of the publication have reported on Si3N4 nanofillers for suppression of the electrical tree growth. In this study, the treeing experiments were conducted by applying a fixed AC voltage of 10 kV and 12 kV at power frequency of 50 Hz on unfilled SiR, SiR/SiO2, and SiR/Si3N4 nanocomposites with different filler concentrations by 1, 3, and 5 weight percentage (wt%) and the electrical treeing parameters were observed with its correlated PD patterns. The outcome from this study found that the SiR/Si3N4 nanocomposites were able to withstand the electrical treeing better than the pure SiR or SiR/SiO2 nanocomposites. Furthermore, the increase in filler concentration improved the electrical tree performances of the nanocomposites. This finding suggests the Si3N4 can be used as filler in polymeric insulating materials for electrical tree inhibition. Meanwhile, the PD activity shows increment when the tree progresses thereby indicating correlation in both parameters which can be as key parameter for monitoring unseen electrical treeing in the opaque samples.

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Temperature Gradient Affecting Electrical Tree in Silicone Rubber under Impulse Superimposed on DC Voltage

IEEE Transactions on Dielectrics and Electrical Insulation ◽

10.1109/tdei.2021.009510 ◽

2021 ◽

Vol 28 (5) ◽

pp. 1480-1487

Author(s):

B. X. Du ◽

Y. Zhang ◽

T. Han ◽

Z. L. Li

Keyword(s):

Temperature Gradient ◽

Silicone Rubber ◽

Dc Voltage ◽

Electrical Tree

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The Relationship Between Electrical Tree Growth and Partial Discharge Characteristics in XLPE

10.1109/eic49891.2021.9612299 ◽

2021 ◽

Author(s):

Shiyou Wu ◽

Shusheng Zheng ◽

Zongheng Zhang ◽

Aixu Zhong ◽

Reniie Cao ◽

...

Keyword(s):

Tree Growth ◽

Partial Discharge ◽

Discharge Characteristics ◽

Electrical Tree ◽

The Relationship

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Effect of Alumina and Halloysite clay on Electrical tree growth in Silicone Rubber Nanocomposite

Journal of Engineering and Science Research ◽

10.26666/rmp.jesr.2018.3.4 ◽

2018 ◽

Vol 2 (3) ◽

pp. 20-25

Author(s):

Keyword(s):

Tree Growth ◽

Silicone Rubber ◽

Strength Properties ◽

Growth Speed ◽

New Approach ◽

Undoped Material ◽

Electrical Tree ◽

Nano Alumina ◽

Tree Growth Rate ◽

Insulation Breakdown

Nowadays Silicone Rubber (SiR) is recommended in high voltage cable accessories fabrication as it offers excellent electrical and mechanical properties. Electrical tree is one of the phenomenon which contributes to the main factor of SiR insulation breakdown. Recently, a new approach has been applied in order to enhance the insulation strength properties by introducing nano filler in undoped material. Thus, this paper presents the influence of nano-alumina and halloysite nanoclay on electrical tree growth in SiR at 0, 1 vol%, 2 vol% and 3 vol% concentration. The electrical tree growth was investigated at 8kVrms after tree inception voltage (TIV) within 30 minutes under room temperature. The results show reductions of electrical tree growth speed and accumulate damage (%) up to 2 vol% nano-alumina and up to 3 vol% halloysite nanoclay. Nevertheless the presence of 3 vol% nano-alumina in SiR leads to the faster electrical tree growth rate and the worst accumulate damage within 1 minute of electrical tree growth process.

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