Experience with a composite insulator testing instrument based on the electric field method

Shaffner, D.; Ruff, D.L.; Vaillancourt, G.H.

doi:10.1109/tdcllm.2000.882838

Cited by 14 publications

(13 citation statements)

References 7 publications

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“…The simulations were performed with a 26 mm × 2 mm conductive defect of ( Figure 5a) and one 15 mm × 1 mm (Figure 5b) in contact with the HV electrode (position 1) and with a conductive defect of 26 mm × 2 mm (Figure 5c) between the first two sheds (position 2). The positions of the defects were determined according to observations performed on real faulty NCI insulators [4,12]. The first step consisted in computing and comparing the Efield distributions closed to the tip of the shed and the insulator rod, with and without the presence of the conductive defect.…”

Section: Numerical Investigationsmentioning

confidence: 99%

“…However, the experimental tests revealed that under polluted condition or high air humidity, diagnosis of faulty insulator became problematic [11]. Additionally, the tests demonstrated that conductive defects not in contact with insulator electrode were difficult to detect, even for 12.5 cm defect lengths [12].…”

Section: Introductionmentioning

confidence: 99%

“…Finally, the last method developed consists in measuring the distribution of the electric field using a specific E-field probe initially developed by Hydro-Quebec for ceramic insulator [9][10][11][12]. This detection method measures the local distortion of the E-field distribution produced by the presence of the conductive defects.…”

Section: Introductionmentioning

confidence: 99%

“…This detection method measures the local distortion of the E-field distribution produced by the presence of the conductive defects. Experimental tests in laboratory and natural sites have demonstrated the reliability of the E-field probe for detecting defects on NCI [2,[9][10][11][12]. However, the experimental tests revealed that under polluted condition or high air humidity, diagnosis of faulty insulator became problematic [11].…”

Section: Introductionmentioning

confidence: 99%

“…In fact, only the E-field method is a direct measurement of the local E-field increase. Experimental tests with the Hydro-Quebec E-field probe showed that this method was very sensitive for defects close to the HV electrode which induce the largest E-field distortion compare to defects located between sheds [2,9,[11][12]. The E-field probe measures the tangential E-field near the edge of each insulator shed using specific metallic electrode arrangement.…”

Section: Introductionmentioning

confidence: 99%

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New method for in live-line detection of small defects in composite insulator based on electro-optic E-field sensor

Volat

Jabbari

Farzaneh

et al. 2013

IEEE Trans. Dielect. Electr. Insul.

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Preliminary results based on experimental tests in laboratory and numerical investigation concerning the live-line detection of a conductive defect in HV composite insulator are depicted.The proposed method is based on E-field sensing using a non-invasive and compact pigtailed electro-optic (EO) single-ended probe. Measurements and numerical FEM modeling were done on a clean dead-end 28 kV composite insulator on which conductive defects of different size and position were simulated. Based on these simulations, the optimal location and orientation of the EO probe were determined regarding the conductive defect length and position. Laboratory tests were performed to validate these results and demonstrate the efficiency of the new detection method. The experimental results have demonstrated that using the optimal EO probe orientation, the E-field sensor was able to detect and locate conductive defect as short as 15 mm × 1 mm in contact with the HV electrode and of 26 mm × 2 mm between sheds. Moreover, the experimental tests have demonstrated the ability of the EO sensor to detect the presence of corona discharges induced by the conductive defects.Index Terms -Composite insulator, defect detection, E-field field sensor, Electrooptic probe, FEM simulations.

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Section: Numerical Investigationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

New method for in live-line detection of small defects in composite insulator based on electro-optic E-field sensor

Volat

Jabbari

Farzaneh

et al. 2013

IEEE Trans. Dielect. Electr. Insul.

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Numerical investigation of electric field distortion induced by internal defects in composite insulators

2017

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This paper presents an exhaustive study of numerical investigations based on three-dimensional finite-element method modelling of several non-ceramic insulators of 69, 110 and 230 kV having different internal semi-conductive defects in terms of size and position. The internal defects were positioned close to the high-voltage electrode, the ground electrode and at floating potential. The simulations effected on the distortion of the axial and radial E-field components close to the insulator shank between sheds. The results obtained showed that the radial E-field component is more sensitive to the presence of an internal defect as it shows a greater distortion in presence of the defect. It was also observed that the E-field component distortion increases with longer internal defect and that this increase is particularly important for a defect at floating potential. Moreover, it was demonstrated that the length of the insulator, for a defect of constant length, has no significant influence on the E-field component distortion. Finally, the results demonstrated that the presence of a grading ring, as used on the 230 kV insulator, does not have any influence on the E-field component distortion, independently of the defect position.

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Boundary integral equation method in the prediction of dielectric characteristics of humidified composite insulator glass–epoxy core

Orlowska¹,

Béroual²,

Fleszyński³

2004

J. Phys. D: Appl. Phys.

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This paper deals with the analysis of the influence of moisture on the dielectric properties of a composite insulator core made of epoxy resin and fibre glass, through measurements of the effective permittivity. The experiments are carried out on different core samples-dry and boiled in distilled water over different time intervals. The measured values of the complex permittivity of the core samples are discussed in the light of the results obtained by a numerical approach based on the boundary integral equation method and the PHI3D package. The comparison of the experimental and simulated results aims at finding the water content in the fibre glass.

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Experience with a composite insulator testing instrument based on the electric field method

Cited by 14 publications

References 7 publications

New method for in live-line detection of small defects in composite insulator based on electro-optic E-field sensor

New method for in live-line detection of small defects in composite insulator based on electro-optic E-field sensor

Numerical investigation of electric field distortion induced by internal defects in composite insulators

Boundary integral equation method in the prediction of dielectric characteristics of humidified composite insulator glass–epoxy core

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