Hydrophobic behavior of insulators coated with RTV silicone rubber

Kim, Seog-Hyeon; Cherney, E.A.; Hackam, R.

doi:10.1109/14.142726

Cited by 128 publications

(40 citation statements)

References 14 publications

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“…In general silicone rubber offers good hydrophobicity for a long time providing high surface electrical resistance, which is attributed to its chemical stability and recovery phenomena due to diffusion of low molecular weight contents from bulk volume to the surface of the material [15]. However, hydrophobicity of material reduces due to water absorption and long term thermal stress.…”

Section: Introductionmentioning

confidence: 99%

Tracking/Erosion Resistance Analysis of Nano-Al(OH)₃Filled Silicone Rubber Insulating Materials for High Voltage DC Applications

Kannan¹,

Sivakumar²,

Mekala³

et al. 2015

Journal of Electrical Engineering and Technology

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-HVDC technology has become popular as an economic mode of bulk power transmission over very long distances. Polymeric insulators in HVDC power transmission lines are affected by surface tracking and erosion problems due to contamination deposit, which pose a greater challenge in maintaining the reliability of the HVDC system. In addition, polymeric insulators are also naturally affected by aging due to various environmental stresses, which in turn accelerates the surface tracking and erosion problems. Research works towards the improvement of tracking and erosion resistance of polymeric insulators by adding nano-sized fillers in the base material are being carried out worldwide. However, surface tracking and erosion performance of nano-filled aged polymeric insulators for HVDC applications are not well reported. Hence, in the present work, tracking and erosion resistance of the nano Al(OH) 3 filled silicone rubber insulation material has been evaluated under DC voltages at different filler concentrations and aged conditions, as per IEC 60587 test procedures. Leakage current and contact angle measurements were carried out to understand the surface hydrophobicity. Moving average technique was used to analyze the trend followed by leakage current. Water aged specimen shows less tracking resistance when compared with thermal aged specimen. It is observed that nanofiller concentration of 5% is even sufficient to get better tracking/erosion resistance under DC voltages.

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Section: Introductionmentioning

confidence: 99%

Tracking/Erosion Resistance Analysis of Nano-Al(OH)₃Filled Silicone Rubber Insulating Materials for High Voltage DC Applications

Kannan¹,

Sivakumar²,

Mekala³

et al. 2015

Journal of Electrical Engineering and Technology

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“…These results indicated that RTV silicone rubber coated improves hydrophobicity and also able to maintain it under various polluted conditions. These phenomena happened because of two reasons [10,11]. On clean surface, its low surface energy does not allow wetting of the surface, and on polluted surfaces, low molecular weight silicone fluid that diffuses from the bulk of the coating surrounds contaminants with a monolayer of fluid that imparts a non-wetting property, or hydrophobicity, to the contaminant layer.…”

Section: Hydrophobicitymentioning

confidence: 99%

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2010

ijeei

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Ceramic insulators are widely used in transmission as well as in distribution lines. As outdoor insulators, the ceramic insulators are subjected to environmental stresses. In particular case, the insulators may severe high pollution exposure. Under the polluted condition, high leakage current will flow on the insulator surface and dry band arching may take place. The phenomena may initiate the insulator flash over leading to the failure of the lines. Several efforts may be taken to improve the insulator performance under polluted condition. Recently, adding of hidrophobic agent on the insulators was introduced to improve the performance of ceramic insulators under polluted condition. This paper reports the experimental results on the application of room temperature vulcanized (RTV) silicone rubber coating on the medium voltage ceramic insulators under various environmental conditions. The samples were put in a test chamber with controlled humidity and pollution condition. The characteristics of RTV Silicon Rubber coated insulator were analyzed, such as its leakage current (LC), hydrophobicity (indicated by measuring contact angle) and Surface Smoothness (indicated by Scanned Electron Microscopy (SEM)) of the RTV Silicon Rubber insulator surface. The LC's waveform parameters such as magnitude and harmonic content (as indicated by the total harmonics distortion (THD)) were analyzed. It was found that the coating was significantly suppressed the magnitude of leakage current and drastically eliminated the harmonic content. The gradient of cross product value between LC magnitude and THD was proved to be a better indicator to show insulator condition rather than LC or THD alone. The coating also significantly increased the flash over voltage of the insulator. Surface analysis indicated that increasing of the water repellence and enhancement of surface resistance of the insulators played important role in the increase of the insulator performances. These experimental results will be the basis of application of RTV Silicon Rubber coated insulator under polluted conditions, especially in Indonesia.

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“…At lightly polluted conditions (0.06 ESDD), the high frequency content ( 15-25 MHz) is also noticed in the frequency spectrum of the PD signal. With respect to increase in pollution level from 0.06 ESDD to 0.12 ESDD, the magnitude of high frequency content (15)(16)(17)(18)(19)(20)(21)(22)(23)(24)(25) significantly reduces and the dominant frequency content shifts towards 5-10 MHz. Energy content of the PD signal increases at long arcs and this will increase the surface local temperature of the thermal aged specimens, which will lead to faster erosion and degradation of the polymeric material.…”

Section: Time and Frequency Domain Analysis Of Pd Signalsmentioning

confidence: 99%

“…Relative humidity plays a major role in the wetting of insulator surface and in the initiaton of partial arcs along the surface of the polluted insulator. Hydrophobic polymers are characterized by high electrical surface resistance which however decreases due to water absorption during ageing and with increasing environmental temperature and contamination build up [23][24]. Hence it is necessary to understand the effect of increase in relative humidity level on the PD activities of the thermal aged polymeric insulator.…”

Section: Pd Patterns At Different Pollution Level and Relative Humiditymentioning

confidence: 99%

Flashover Prediction of Polymeric Insulators Using PD Signal Time-Frequency Analysis and BPA Neural Network Technique

Narayanan¹,

Karthik²,

Chandrasekar³

2014

Journal of Electrical Engineering and Technology

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-Flashover of power transmission line insulators is a major threat to the reliable operation of power system. This paper deals with the flashover prediction of polymeric insulators used in power transmission line applications using the novel condition monitoring technique developed by PD signal time-frequency map and neural network technique. Laboratory experiments on polymeric insulators were carried out as per IEC 60507 under AC voltage, at different humidity and contamination levels using NaCl as a contaminant. Partial discharge signals were acquired using advanced ultra wide band detection system. Salient features from the Time-Frequency map and PRPD pattern at different pollution levels were extracted. The flashover prediction of polymeric insulators was automated using artificial neural network (ANN) with back propagation algorithm (BPA). From the results, it can be speculated that PD signal feature extraction along with back propagation classification is a well suited technique to predict flashover of polymeric insulators.

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Hydrophobic behavior of insulators coated with RTV silicone rubber

Cited by 128 publications

References 14 publications

Tracking/Erosion Resistance Analysis of Nano-Al(OH)₃Filled Silicone Rubber Insulating Materials for High Voltage DC Applications

Tracking/Erosion Resistance Analysis of Nano-Al(OH)₃Filled Silicone Rubber Insulating Materials for High Voltage DC Applications

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Flashover Prediction of Polymeric Insulators Using PD Signal Time-Frequency Analysis and BPA Neural Network Technique

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Hydrophobic behavior of insulators coated with RTV silicone rubber

Cited by 128 publications

References 14 publications

Tracking/Erosion Resistance Analysis of Nano-Al(OH)3Filled Silicone Rubber Insulating Materials for High Voltage DC Applications

Tracking/Erosion Resistance Analysis of Nano-Al(OH)3Filled Silicone Rubber Insulating Materials for High Voltage DC Applications

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Flashover Prediction of Polymeric Insulators Using PD Signal Time-Frequency Analysis and BPA Neural Network Technique

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Tracking/Erosion Resistance Analysis of Nano-Al(OH)₃Filled Silicone Rubber Insulating Materials for High Voltage DC Applications

Tracking/Erosion Resistance Analysis of Nano-Al(OH)₃Filled Silicone Rubber Insulating Materials for High Voltage DC Applications