Leakage current characteristics study on electrical equivalent circuit of field-aged RTV silicone rubber coated and noncoated insulators in a coastal area

Rachmawati, Rachmawati; Fauziah, Dini; Alfiadi, Heldi; Suwarno, &

doi:10.1109/ichveps.2017.8225889

Cited by 8 publications

(2 citation statements)

References 7 publications

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“…LC increases with the increasing of contamination severity and relative humidity. Increasing of contamination severity combine with high relative humidity add up the moisture content, reduce the insulator surface resistance and lead to a high LC flows on insulator surface [29].…”

Section: Validation Of the Model At Different Relative Humidity And Esddmentioning

confidence: 99%

Prediction of surface leakage current of overhead insulators under environmental and electrical stresses

Abdullah¹,

Piah²,

Othman³

et al. 2020

Bulletin EEI

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Leakage current is one of the critical aspects to consider for overhead transmission line insulator’s condition and performance assessment. As the leakage current increase, the size of the dry band also will increase leads to the dry band arcing, deteriorate the insulator performance and contribute to the development of insulator flashover. Based on the literature study, other than the existence of contaminations on the surface of insulator combined with moisture, the variation in leakage current is also affected by the environmental and electrical stresses. Previous researches have shown the effect of environmental and electrical stresses on surface leakage current based on experimental and simulation results. This paper outlines an analytical approach based on dimensional analysis to propose a new mathematical model of leakage current under environmental and electrical stresses. To justify the applicability of the derived dimensional model, the new model has been validated using previous researcher’s experimental results. The validation indicated that the proposed model had shown a good agreement with the previous experimental results. The proposed dimensional equation for this research work can be potentially used as a predictive performance model to evaluate and monitor the leakage current and insulator’s performance

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Section: Validation Of the Model At Different Relative Humidity And Esddmentioning

confidence: 99%

Prediction of surface leakage current of overhead insulators under environmental and electrical stresses

Abdullah¹,

Piah²,

Othman³

et al. 2020

Bulletin EEI

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show abstract

“…The experiment was conducted on 12 post-pin type outdoor ceramic insulators that have been installed in a substation in Pangandaran coastal area since 2011. The LC measurements were taken every 1-2 years until the last measurement that was in July 2017 [15][16][17]. Half of the insulators are coated with RTV silicone rubber and the others are not, as shown in Figure 3.…”

Section: B Lc Measurement For Field-aged Rtv Silicone Rubber Coated mentioning

confidence: 99%

The Study on Leakage Current Characteristics and Electrical Properties of Uncoated Ceramic, RTV Silicon Rubber Coated Ceramic, and Semiconducting Glazed Outdoor Insulators

Rachmawati¹,

Sartika²,

Putra³

et al. 2018

IJEEI

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Insulator is one of the most important equipment in an electric power system. Failure of insulator may interrupt the electric energy delivery. The system reliability is greatly affected by the performance of the insulator. Therefore, ensuring the high performance of insulators has become indispensable. There are many methods to increase the performance of the outdoor insulator that are exposed to environmental conditions, such as temperature, humidity, and the presence of pollutants. Among the methods, applying room temperature vulcanized (RTV) silicone rubber coating and semiconducting glaze on the insulator surface are often used. This paper discusses the performance of uncoated ceramic insulator, RTV silicone rubber coated insulator, and semiconducting glazed insulator (SGI), as well as the comparison result among them. The performance is indicated by measuring leakage current (LC), surface temperature, and hydrophobicity. In addition, computer simulation on outdoor insulators using ATPDraw software is also conducted for LC waveform resulted by each type of insulator in order to study the electrical properties of each insulator. In the simulation, an outdoor insulator is represented by an electrical circuit model consisting of capacitors, nonlinear resistors, and number of arc models. AC voltage is applied to the model and the current is monitored. Hence, some key parameters of LC waveform are required to determine the similarity between measured LC waveform and simulated LC waveform, which are LC magnitude, Total Harmonic Distortion (THD), and dominant harmonic number. Experiment result shows that LC waveform and magnitude are strongly affected by the applied voltage, environmental condition, and the condition of the insulator surface itself. Specifically for SGI, LC waveforms are generally similar with the sinusoidal applied voltage. The LC waveforms are also symmetrical for positive and negative half cycles and no flashover was observed for applied voltage up to 40 kV. The hydrophobicity of insulator surface decreases after the experiments, with the pollutant presence and salt fog condition cause higher reduction compared to the clean samples and in clean fog environment. SGI has higher hydrophobicity compared to ceramic insulator. Field-aged RTV silicone rubber coated insulator shows higher hydrophobicity compared to field-aged uncoated ceramic insulator. At the end of the 6 th year, the difference of contact angle between the two types of insulators can reach up to 50 -60°. This proves that less pollutant is likely to stick on coated insulators for long time. The LC waveforms obtained from all experiments both in the laboratory or in the field have been successfully simulated through computer simulation. The simulation indicated that SGI is more capacitive than normal ceramic insulator and has lower values of piecewise resistance of the nonlinear resistance, resulting LC flow on the insulator surface also much higher. Despite the increased applied voltage, SGI shows very little discharge on its...

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Study of Leakage Current Characteristics of High Voltage Insulators Ageing After Dry Season in Polluted Environmental Conditions

Manjang

Syafaruddin

Tambi

et al. 2021

2021 3rd International Conference on High Voltage Engineering and Power Systems (ICHVEPS)

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Leakage current characteristics study on electrical equivalent circuit of field-aged RTV silicone rubber coated and noncoated insulators in a coastal area

Cited by 8 publications

References 7 publications

Prediction of surface leakage current of overhead insulators under environmental and electrical stresses

Prediction of surface leakage current of overhead insulators under environmental and electrical stresses

The Study on Leakage Current Characteristics and Electrical Properties of Uncoated Ceramic, RTV Silicon Rubber Coated Ceramic, and Semiconducting Glazed Outdoor Insulators

Study of Leakage Current Characteristics of High Voltage Insulators Ageing After Dry Season in Polluted Environmental Conditions

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