Electric Field and Thermal Analysis of 132 kV Ceramic Oil-Filled Cable Sealing Ends

Zachariades, Christos; Peesapati, Vidyadhar; Gardner, Richard; Cwikowski, Oliver

doi:10.1109/tpwrd.2020.2977728

Cited by 15 publications

(5 citation statements)

References 18 publications

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Section: Full‐scale Testingmentioning

confidence: 99%

“…However, detecting the signs of ageing for CSEs in operation is not straightforward. Electric field measurements on CSEs, although theoretically possible as reported in [7], need to be conducted by personnel specially trained for live line work. Unlike the accelerated ageing testing reported F I G U R E 8 Localised burn marks and dark deposits on the stress cone surface due to the high electric field magnitude causing degradation of the semi-conducting tape underneath the earthed clip F I G U R E 9 Damage to the semi-conducting tape, dark deposits and tracking on the surface of the stress cone due to the high electric field magnitude at the edges of the earthed clip previously, visual inspection of the CSE internal components is practically impossible since the CSE shell is not transparent and CSEs are in most cases sealed-for-life units.…”

Section: Test Setupmentioning

confidence: 99%

“…The most frequent activity according to [1] appears to be a visual inspection for identification of external defects such as cracks, deposits, and leaks, followed by thermographic scanning. The latter has shown some potential in identifying potential issues with the CSE design or the cable termination process with the caveat, however, that there must be an initial point of reference that is measurements when the CSE is new or a detailed computational model [7]. Partial discharge (PD) detection appears to be relatively limited in use with only a fifth of the operators employing it and only periodically for suspect terminations [1, 8].…”

Section: Introductionmentioning

confidence: 99%

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Investigation of incipient faults in 66 kV oil‐filled cable sealing ends

et al. 2022

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This paper reports on the investigation of incipient fault mechanisms of a widely used family of Cable Sealing Ends (CSEs) which use an earthed metallic clip on top of the stress cone to fasten the cable termination stress grading. Finite element simulations indicate that the clip is causing localised electric field enhancement which could also cause impurities in the oil to move towards the clip under the influence of the dielectrophoretic force. Accelerated ageing tests of stress cones in the laboratory have corroborated the simulation results, with the high electric field causing degradation of the semi‐conducting tape underneath the clip as well as initiation of tracking on the surface of the stress cone originating from the edges of the clip. Partial discharge (PD) testing using a bespoke test rig in the high voltage laboratory has shown that incipient faults originating from the ageing of the solid CSE materials can only be detected after surface tracking has progressed substantially. Even then, the intermittent nature of PD activity can pose a risk to the accurate condition assessment of CSEs if continuous monitoring is not employed and if the ultra‐high frequency method is used on its own.

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Section: Full‐scale Testingmentioning

confidence: 99%

Section: Test Setupmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Investigation of incipient faults in 66 kV oil‐filled cable sealing ends

et al. 2022

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“…Thus, a model consisting of an NCS and cable end is established in COMSOL software to calculate the mutual capacitances. The materials and their relative permittivities are listed in Table I [29]. The relationships between d sp , r sp , and the mutual capacitances are simulated and analyzed.…”

Section: Design and Calibration Of The Ncsmentioning

confidence: 99%

A Double-Terminal Traveling-Wave-Based Method Using Novel Noncontact Sensors for Fault Location in Transmission Cable Lines

et al. 2021

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The burgeoning demand for enhanced power-system safety means that there is increased attention on technologies for the detection and location of cable faults. The double-terminal fault location method, which senses a fault current using a current transformer (CT), is the most effective and widely applied method in industrial practice. However, CT sensors may suffer from magnetic saturation when exposed to a high fault current, resulting in significant location errors, and their sensitivity cannot be adjusted. To address this problem, this paper describes an improved method for the acquisition of fault signal and the identification of fault-wave arrival time in power cables. First, a novel noncontact sensor (NCS) is developed for the detection of electric fields, and its sensitivity-adjustment curves are obtained by theoretical calculation and simulation. Then, based on feedback variational mode decomposition (FVMD) and the Wigner-Ville distribution (WVD), an improved method (the FVMS + WVD method) for the identification of fault-wave arrival time is devised, and its efficacy and accuracy are verified by simulations in Power Systems Computer-Aided Design/Electromagnetic Transients including DC (PSCAD/EMTDC) software. Finally, the fault-wave arrival-time detection performance of the NCS is examined in a series of on-site DC and AC experiments based on damped AC technology. The results show that the NCS exhibits feasible and effective performance, and that its response can be appropriately tuned based on its sensitivityadjustment curves. The FVMD + WVD method is more accurate than several other current methods, as its error is only 0.48%, and thus this method enables the practical location of cable faults. In sum, these findings demonstrate that the NCS and the FVMD + WVD method comprise an improved system for the detection and location of cable faults, which will enhance cable safety in power systems.INDEX TERMS fault detection and location, double-terminal, electric field sensors, feedback variational mode decomposition, Wigner-Ville distribution.

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“…The above studies show that numerical simulations based on finite elements can be used to analyze the electrical and thermal distribution characteristics of cable terminals effectively. The electrical heat distribution characteristics of vehicle cable terminals in actual operation are affected by leakage current [9,13]; however, studies on the heat distribution characteristics of cable terminals under leakage current conditions are rare. Therefore, considering the leakage current, exploring the thermal characteristics of cable terminals through multiphysical field coupling is more in line with the actual situation.…”

Section: Introductionmentioning

confidence: 99%

Visual localization and quantitative detection method for thermal defects in cable terminals of high-speed trains based on a temperature derivative

Liu,

Jiao,

Nie

et al. 2024

Meas. Sci. Technol.

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Cable terminal defect detection plays an important role in ensuring the safe and stable operation of high-speed trains (HST). In this paper, a numerical model of the electromagnetic thermal field of overheating defects of cable terminal shielding grids and a method of detecting internal defects of cable terminals - even-order temperature derivative (EOTD) is proposed for quantitative detection of internal defective structures of vehicle-mounted cable terminals. Firstly, a numerical model of the electromagnetic thermal field of cable terminals under the condition of leakage current is constructed, through which the temperature field distribution characteristics of different defective structures are analyzed. Then, the intuitive location of the defective region is obtained by investigating the derivative characteristics of the temperature image, and the depth and intensity of the defects are quantitatively assessed by using the main side peak (MSP) distances and the MSP values extracted from the derivative curves. Finally, the simulation and experimental results achieve the identification of defect structures and the quantitative detection of defect depth and intensity, proving the effectiveness and accuracy of the proposed method.

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Electric Field and Thermal Analysis of 132 kV Ceramic Oil-Filled Cable Sealing Ends

Cited by 15 publications

References 18 publications

Investigation of incipient faults in 66 kV oil‐filled cable sealing ends

Investigation of incipient faults in 66 kV oil‐filled cable sealing ends

A Double-Terminal Traveling-Wave-Based Method Using Novel Noncontact Sensors for Fault Location in Transmission Cable Lines

Visual localization and quantitative detection method for thermal defects in cable terminals of high-speed trains based on a temperature derivative

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