Aging of 154 kV underground power cable insulation under combined thermal and electrical stresses

Aras, Faruk; Alekperov, V. A.; Can, Nursel; Kirkici, H.

doi:10.1109/mei.2007.4318272

Cited by 69 publications

(23 citation statements)

References 26 publications

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“…The lifespan of the insulating materials under various combined stresses is a major and significant interest in failure studies [27,28]. Under various environmental stresses, the insulator loses its ability to work as required because of premature dielectric changes that take place in the form of chemical reactions and change in physical properties.…”

Section: Physico-chemical Propertiesmentioning

confidence: 99%

Risk Assessment of Failure of Outdoor High Voltage Polluted Insulators under Combined Stresses Near Shoreline

et al. 2017

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Abstract:The aim of this paper is to investigate the various effects of climate conditions on outdoor insulators in coastal areas as a result of saline contamination under acidic and normal cold fog, determining significant electrical and physico-chemical changes on the insulator surface and considering the effect of discharge current, electric field distribution and surface roughness. To replicate similar conditions near the shoreline, experimental investigations have been carried out on insulation materials with the combined application of saline contamination and acidic or normal cold fog. The test samples included silicone rubber (SiR), ethylene propylene diene monomer (EPDM) and high-density polyethylene (HDPE), which were used as reference. The materials are of the same composition as those used in real-life outdoor high voltage insulators. All samples were aged separately in an environmental chamber for 150 h for various saline contaminations combined with acidic and normal cold fog, and were generated by means of the adopted experimental setup. This analysis represented conditions similar to those existing near the shoreline exposed to saline and acid spray during winter and early spring. Electric field and discharge current along polymeric samples were examined under acidic and normal cold fog. Fourier transform infrared (FTIR) spectroscopy and scanning electron microscopic (SEM) were used to probe the physico-chemical changes on the samples surface and investigate the hydrophobicity recovery property after aging tests. Finally, a comparative study was carried out on polymeric samples before and after being exposed to the acidic and normal cold fog based on the results obtained from the experiment. Research data may provide references for the better prediction of surface degradation as well as for the better material coating and design of external insulation.

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Section: Physico-chemical Propertiesmentioning

confidence: 99%

Risk Assessment of Failure of Outdoor High Voltage Polluted Insulators under Combined Stresses Near Shoreline

et al. 2017

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“…According to Equation (8), if the contact resistance between the cable body and connection tube is neglected and σ 1 = σ 2 , it is known that k < 1, which is an ideal case. However, in practical engineering, the k will be always greater than 1 due to the existence of contact resistance, and when defects exist in the crimping process of cables, the k value will be greater than 1.…”

Section: The Equivalent Model Of Cable Joint Under Crimping Process Dmentioning

confidence: 99%

“…The internal defects of cable joints are the main cause of explosions in cable joints. Explosions of cable joints happen due to internal defects that cause changes in the physical fields of cable joints, including electromagnetic fields [4,5], temperature fields [6,7] and stress fields [8][9][10]. Therefore, in order to protect the cable joints and avoid cable joint accidents, especially explosions, it is important to analyze the electromagnetic-thermal-mechanical characteristics of cable joints under internal defect conditions and find methods to evaluate the internal defects of cable joints [11].…”

Section: Introductionmentioning

confidence: 99%

The Coupling Fields Characteristics of Cable Joints and Application in the Evaluation of Crimping Process Defects

Yang

Cheng³

et al. 2016

Energies

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Abstract:The internal defects of cable joints always accelerate the deterioration of insulation, until finally accidents can arise due to the explosion of the joints. The formation process of this damage often involves changes in the electromagnetic, temperature and stress distribution of the cable joint, therefore, it is necessary to analyze the electromagnetic-thermal-mechanical distribution of cable joints. Aiming at solving this problem, the paper sets up a 3-D electromagnetic-thermal-mechanical coupling model of cable joints under crimping process defects. Based on the model, the electromagnetic losses distribution, temperature distribution and stress distribution of a cable joint and body are calculated. Then, the coupling fields characteristics in different contact coefficient k, ambient temperature T amb and load current I were analyzed, and according to the thermal-mechanical characteristics of a cable joint under internal defects, the temperature difference ∆T f and stress difference ∆σ f of cable surface are applied to evaluate the internal cable joint defects. Finally, a simplified model of the cable joint is set up to verify the accuracy of the coupling field model proposed in this paper, which indicates that the model can be used to analyze the coupling fields characteristics of cable joints and the method can be applied to evaluate crimping process defects of cable joints.

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“…In practice, cables are generally installed in some compact ductbanks in order to provide easier installation of multiple cables in a concrete space [1], as shown in Figure 1. However, installation and maintenance of underground cables are a lot more expensive compared with overhead lines [2]. According to [3], the cost of laying the cables is $125 -$200 per meter.…”

Section: Introductionmentioning

confidence: 99%

Configuration Optimization of Cables in Ductbank Based on Their Ampacity

Sun¹,

Makram²

2018

JPEE

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Electrical power companies are using more underground cables rather than overhead lines to distribute power to their customers. In practice, cables are generally installed in some compact ductbanks. Since the cost of underground cables is very expensive, using the entire space of a ductbank is extremely important. But such usage is limited due to the overheating of cables. Overheating is generally caused by overload, which means the carrying current exceeds the ampacity of a cable. The ampacity of a cable depends on not only the material and design of a cable but also the distance between different cables. Thus the configuration of cables determines the total ampacity value and the potential use of a ductbank. In this paper, the best configuration based on ampacity is achieved for a three-row, five-column ductbank that is buried at a depth of one meter below the earth's surface. Both balanced and unbalanced scenarios are considered, and all cables have two available types to be selected.

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Aging of 154 kV underground power cable insulation under combined thermal and electrical stresses

Cited by 69 publications

References 26 publications

Risk Assessment of Failure of Outdoor High Voltage Polluted Insulators under Combined Stresses Near Shoreline

Risk Assessment of Failure of Outdoor High Voltage Polluted Insulators under Combined Stresses Near Shoreline

The Coupling Fields Characteristics of Cable Joints and Application in the Evaluation of Crimping Process Defects

Configuration Optimization of Cables in Ductbank Based on Their Ampacity

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