Analysis of electric field distribution on the surface of polymer post insulator used in electric railway catenary system

Jang, Dong-Uk; Lim, K.K.; Han, Moonseob

doi:10.1109/cmd.2008.4580395

Cited by 5 publications

(2 citation statements)

References 3 publications

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“…This maximum always occurs near the triple junction: polymer-air-hemisphere. Similar results are reported in [26][27][28], indicating that the metallic hemispheres model is useful.…”

Section: Corona Onset Voltage: Capacitor -Metallic Hemispheressupporting

confidence: 93%

Experimental investigation of corona onset in contaminated polymer surfaces

Souza

Lopes

2015

IEEE Trans. Dielect. Electr. Insul.

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Concerns about corona and its harmful effects, particularly in polymer insulators, have increased in recent years. Research involving corona identification, quantification, and formation mechanism is important to understand the aging process and to avoid premature failures. This paper investigates the corona inception and its relation with polymer surface conditions. Experiments of visual corona identification and RadioInterference Voltage (RIV) measurements were performed. Corona onset voltage was investigated in arrangements simulating different service conditions. Wet and contaminated insulating surfaces were reproduced. An RTV coated insulating sample and a polymer insulator were used. The electric field (E-field) at corona onset was numerically evaluated through computational simulations using the Finite Element Method. Corona onset voltage, E-field and RIV were analyzed according to the contamination level. The results clearly show how certain service conditions, particularly the association water droplets and pollution, enhance the E-field and can lead to corona onset.

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“…This maximum always occurs near the triple junction: polymer-air-hemisphere. Similar results are reported in [26][27][28], indicating that the metallic hemispheres model is useful.…”

Section: Corona Onset Voltage: Capacitor -Metallic Hemispheressupporting

confidence: 93%

Experimental investigation of corona onset in contaminated polymer surfaces

Souza

Lopes

2015

IEEE Trans. Dielect. Electr. Insul.

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“…The simulation was performed using the finite element method to break with the vulnerability point due to the field strength on these isolators. References [13,14] studied and distributed the field and electric potential on the surface of a polymeric insulator from the presence of contaminated spots under twodimensional conditions using the MAXWELL software. In Reference [15,16], we calculate the field distribution and electric potential using the finite element method in a polymer insulator using a corona ring.…”

Section: Introductionmentioning

confidence: 99%

The Hazard of Electric Field Increment in the Damaged Silicon-Rubber and Porcelain Insulators

Shemshadi

Khorampour

2022

IJEEC

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In power transmission lines, it is necessary to isolate the inherent voltage parts from each other and from zero potential. An insulator is defined as having a high degree of electrical insulation between the conductors and the brackets. Insulators also allow for mechanical conductivity of the conductor and ground. The presence of a broken insulator can alter the stress distribution. In this paper, the effect of mechanical insulation cracking (chattering) on electric field in two common types of insulators (porcelain and silicone rubber) and electric potential distribution models are analyzed. First, the electric field and electric potential patterns in the solid insulator are examined. In the following, the insulator is assumed to be broken, and the electric field and electric potential patterns for a broken insulator relative to the basic insulator shape are illustrated and compared. The results show that the presence of insulation cracking under dry and environmentally benign conditions affects the stress distribution pattern within and around the insulator. Finally, a comparison between the effect of fracture on the electric field and the potential distribution patterns in different parts of the insulator is discussed in detail.

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