Measurement of leakage current for monitoring the performance of outdoor insulators in polluted environments

Ramirez, I.; Hernández, Ramiro Parra; Montoya, Gerardo

doi:10.1109/mei.2012.6232007

Cited by 58 publications

(11 citation statements)

References 6 publications

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“…Measurements of flashover voltage (FOV), maximum leakage current (MLC), ESDD and surface conductivity (SC) were conducted according to standard procedures [9][10][11] at the Pyramids High Voltage Research Center (PHVRC) of Egypt. Results of the average values are reported in Table I.…”

Section: Measurement Of Surface Conductivity (Sc) and Esddmentioning

confidence: 99%

“…Measurement of maximum leakage current is an effective indicator for evaluating the performance of contaminated insulators on transmission lines. In case of flashover, the maximum leakage current value is defined as the peak current value in the half cycle before flashover [10]. The experimental results obtained against the measured surface conductivity (SC) are reported in Table I and plotted in Fig.4.…”

Section: Measurement and Modeling Of Maximum Leakage Current (Mlc)mentioning

confidence: 99%

See 1 more Smart Citation

Flashover Performance of contaminated HV Outdoor Insulators in Egypt

Abouelsaad¹,

Abouelatta²,

Arafa³

et al. 2014

The International Conference on Electrical Engineering

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Contamination on outdoor insulators enhances the chances of flashover and can lead to transmission line outages and reduced system reliability. In practice, various contaminant types, usually classified as soluble and insoluble, settle on outdoor insulators and increase the possibility of flashover. The paper assesses the flashover performance of such insulators in Egypt; in view of the nature and composition of contaminants accumulated on their surfaces. To quantify these contaminants, numerous samples are gathered from different regions of the country and subjected to a comprehensive chemical analysis at the scale analysis laboratory of the Egyptian Electricity Transmission Company. Measurements of equivalent salt deposition density (ESDD) surface conductivity (SC), maximum leakage current (MLC) and flashover voltage (FOV) were conducted and correlated to the contamination constituents. The study utilized IEC standard cap-pin suspension insulators which were hanged in regions of different pollution levels and nature. Regression models for predicting the flashover voltage as related to ESDD and MLC as related to surface conductivity were developed. The models are validated through statistical analysis as well as comparison with measured data. The results from this work are useful for utilities to take adequate measures to improve the efficiency of their transmission systems through scheduling of their insulator maintenance strategy and selecting the appropriate insulator design for different system voltages and regions.

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Section: Measurement Of Surface Conductivity (Sc) and Esddmentioning

confidence: 99%

Section: Measurement and Modeling Of Maximum Leakage Current (Mlc)mentioning

confidence: 99%

Flashover Performance of contaminated HV Outdoor Insulators in Egypt

Abouelsaad¹,

Abouelatta²,

Arafa³

et al. 2014

The International Conference on Electrical Engineering

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“…(3) b=-3.2×10 8 (4) where: S a = Salinity in kg/m 3 or mg/cm 3 V= volume of distilled water (cm³) A= area of washed insulator surface (cm²) 20 S/m = volume conductivity at 20 C (S/m) 20 = corrected conductivity at 20 C = measured conductivity at temp. = temperature of the solution ( C) b= is a factor depending on…”

Section: A Esdd Measurementmentioning

confidence: 99%

“…In case of flashover, the maximum leakage current value is defined as the peak current value in the half cycle before flashover [8]. The laboratory tests are performed in the multi-function artificial climate chamber (MACC) in which the relative humidity can be controlled between 40% and 100% [9].…”

Section: B Leakage Current and Flashover Voltage Measurementsmentioning

confidence: 99%

Environmental pollution effects on insulators of northern Egypt HV transmission lines

AbouelSaad

Abouelatta

Arafa

et al. 2013

2013 Annual Report Conference on Electrical Insulation and Dielectric Phenomena

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Flashover of polluted high voltage insulators is a major problem for operation of power lines in Egypt. In 2010, insulators' pollution was the cause of several interruptions in the Egyptian electric network. Variations of climatic conditions and large industrial developments in the last few years call to update the pollution map of Egypt. To achieve this, six sites in northern Egypt with different types of pollution (industrial, desert, marine and their mixtures) have been investigated. To asses the pollution behavior of line insulators, IEC standard cap-pin suspension insulators were hanged for a time zone of 5 months. The study was conducted through measurements of: Equivalent salt deposition density (ESDD), Surface Conductivity, Maximum leakage current and Flashover voltage. The results are useful to assess the insulation performance in different environmental situations and as well to provide an updated pollution map in Egypt.

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“…The theory is of great significance to the signal sampling, transmission and storage. The priori condition of the compressed sensing theory is that the signal can be sparsely represented by transformation, and the signal of insulator leakage current has the characteristics of being sporadic, continuity, and periodicity, which meets the priori conditions . In this paper, the compressed sensing theory is applied to complete sparse representation and reconstruction for leakage current signal.…”

Section: Introductionmentioning

confidence: 99%

Research on wavelet-based sparse representation of insulator leakage current signal

Huang

2013

Int. Trans. Electr. Energ. Syst.

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Summary In recent years, there are more and more frequent and severe accidents caused by pollution flashover on the substation equipment of Chinese power systems. This paper presents a method for processing the current leakage signal for pollution flashover, which is based on sparse representation, because the leakage current as a detection factor carries large amount of information and thus, requires higher sampling rate and processing speed. Firstly, under a lower sample frequency, sparse decomposition of leakage current signals for the pollution flashover of 110 kV transmission line is finished based on sym8 wavelet. Then, the signals are reconstructed by the Regularized Orthogonal Matching Pursuit algorithm. The result shows that sparse and quick representation of the signal is achieved. As the leakage current signal contains more data and more singularities, the reconstruction error is lower with relatively higher compression ratio. We argue that this sparse representation method will be put into broad applications for fault monitoring and signal transmission of power system. Copyright © 2013 John Wiley & Sons, Ltd.

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Measurement of leakage current for monitoring the performance of outdoor insulators in polluted environments

Cited by 58 publications

References 6 publications

Flashover Performance of contaminated HV Outdoor Insulators in Egypt

Flashover Performance of contaminated HV Outdoor Insulators in Egypt

Environmental pollution effects on insulators of northern Egypt HV transmission lines

Research on wavelet-based sparse representation of insulator leakage current signal

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