Tracking, erosion and thermal distribution of micro‐AlN + nano‐SiO ₂ co‐filled silicone rubber for high‐voltage outdoor insulation

Abstract

Thermal depolymerisation induced tracking and erosion of polymeric insulators is one of the key insulation failure modes and this process adversely affects the reliability of power delivery networks. This study reports the tracking, erosion and thermal distribution of micron-AlN and micron-AlN + nano-SiO 2 co-filled silicone rubber composites. A tracking-erosion model is presented to explain how the co-filled set of particles directly affects such mechanisms. Aluminium nitride (AlN: 5-10 μm) and silica (SiO 2 : 20 nm) particles were procured for fabricating test samples. The inclined plane test according to IEC 60587 was carried out using tracking voltage method 2 with an initial applied voltage of 3 kV and a ramping rate of 0.25 kV/h over the duration of 240 min. Measurement results show co-filled composites exhibit significantly lower physical tracking and erosion as compared to micron-AlN filled composites. Thermal accumulation and average leakage current in co-filled composites are found noticeably lower than micron-filled counterparts. Moreover, the increased surface area of the combined co-filled particles in the composites provides better scattering and reduce secondary electron collision. This may impede the release of high energy causing thermal degradation.

Effect of regular and core shell nano fillers on the partial discharge and tracking performance of low density polyethylene

“…All the samples experienced arcing on their surface because of the contaminant and high voltage stress. The carbon tracks and pits were formed between the HV electrode and ground electrode due to continuous arcing on the surface of samples [27]. The samples having least amount of tracking and pitting among all are shown in figure 16 and the ones with highest amount of tracking and pitting are shown in figure 17.…”

Silicone Rubber Composites with High Breakdown Strength and Low Dielectric Loss Based on Polydopamine Coated Mica

“…Silicone rubber (SR) has been widely used in high-voltage outdoor insulation due to the excellent hydrophobicity and weather-resistance [1][2][3]. Fillers are added into the pure SR to improve specific properties as well as to reduce cost [4][5][6]. So far, alumina tri-hydrate (ATH) is the most commonly used filler in the SR composite insulator [7,8].…”

The tracking and erosion performance of silicone rubber incorporated with novel TiO2@SiO2 core-shell nano fillers under the IEC 60587 standard

“…The most common NPs investigated in literature are Aluminum Tri-hydride (ATH) [7][8][9] and silica (SiO 2 ) [10,11]. Aluminum Nitride (AlN) [12,13], Aluminum hydroxide Al(OH) 3 [14] , Boron Nitride (BN) [13,15], barium titanate (BaTiO 3 ) [16] and alumina (Al 2 O 3 ) [17] are also investigated in few studies.…”

“…The addition of nano-SiO 2 rapidly conducts heat out in the air and suppresses the temperature rise in the discharge zone and hence improves the thermal stability and chemical bonding in the interaction region of SiR which results in the improvement of resistance against tracking and erosion. A comparison study was carried out in [12] in which two different compositions were made. In first composition micro-AlN was added to SiR.…”