Electric stress analysis of a medium voltage cable termination subjected to standard and non-standard lightning impulse voltages

Bhattacharyya, S.; Chakraborty, Arpan; Saha, Biswajit; Chatterjee, Soumya

doi:10.1109/icicpi.2016.7859696

Cited by 5 publications

(4 citation statements)

References 6 publications

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“…The electric field distribution nephogram showed that the high electric field area concentrated in the silicone rubber reinforced insulation near the root of stress cone, which was much larger than the field intensity of XLPE insulation of the body. The closer to the root of stress cone, the greater the electric field intensity and the higher the electric field intensity; high field intensity near the root of stress cone may cause partial discharge and affect the operation of cable [15]. It was found that the electric field distribution of the terminal was not uniform when ordinary silicone rubber was used as reinforced insulation, and it was prone to discharge or breakdown failure; therefore it is not suitable as the reinforced insulation of highvoltage cable terminal.…”

Section: Discussionmentioning

confidence: 99%

Electric Intensity Distribution of Cross-Linked Polyethylene Based High-Voltage Cable Termination

2019

IJOMAM

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Cross-linked polyethylene (XLPE) based high-voltage cable termination has extremely uneven distribution of electric intensity distribution, which limits its development. This study explored the influence of different insulating materials of XLPE based high-voltage cable termination on electric intensity. A simulation model of high-voltage cable termination was established using a multi-physics coupling simulation software. Ordinary silicone rubber and nanographite-silicone rubber composite were taken as the reinforced insulation of termination. The simulation results showed that the farther away from the root of the stress cone, the smaller the field strength. When ordinary silicone rubber was used as the reinforced insulation, the high electric field concentrated at the root of the stress cone, and the maximum electric field strength was 88.67 kV/mm. When nano-graphite-silicone rubber composite was used as reinforcing insulation, high electric field uniformly distributed in the XLPE insulation of cable terminal, the maximum electric field was 14.79 kV/mm, and the electric field strength at the root of stress cone was about one tenth of that of ordinary silicone rubber. It indicates that nano-graphite-silicone rubber composite can homogenize the electric field distribution and reduce the possibility of breakdown damage of termination and is a suitable reinforced insulation for high-voltage cable termination.

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Section: Discussionmentioning

confidence: 99%

Electric Intensity Distribution of Cross-Linked Polyethylene Based High-Voltage Cable Termination

2019

IJOMAM

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“…Of course, an IT is not the only grid component that has to work in both normal and anomalous conditions. In fact, all electrical assets, such as energy meters [ 12 , 13 , 14 ], electric machines [ 15 , 16 ], and accessories [ 17 , 18 , 19 ], have to be properly designed to avoid (i) encountering any grid malfunctions or (ii) having corrupted and incorrect measurements sent and processed by typical algorithms dedicated to the control and management of the network [ 20 , 21 , 22 ].…”

Section: Introductionmentioning

confidence: 99%

On the Long-Period Accuracy Behavior of Inductive and Low-Power Instrument Transformers

Mingotti

Bartolomei

Peretto

et al. 2020

Sensors

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The accuracy evaluation of instrument transformers is always a key task when proper control and management of the power network is required. In particular, accuracy becomes a critical aspect when the grid or the instrumentation itself is operating at conditions different from the rated ones. However, before focusing on the above non-rated conditions, it is important to fully understand the instrument transformer behavior at rated conditions. To this end, this work analyzed the accuracy behavior of legacy, inductive, and low-power voltage transformers over long periods of time. The aim was to find patterns and correlations that may be of help during the modelling or the output prediction of voltage transformers. From the results, the main differences between low-power and inductive voltage transformers were pointed out and described in detail.

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“…The field enhancement at the cable end produces surface and external discharges in the air, which can be prevented by using properly designed terminations [1,9,10,14]. In this sense, arrangements with different characteristics were studied by [12][13][14][15][16][17][18][19].…”

Section: Introductionmentioning

confidence: 99%

“…In [13], for example, different types of field grading options for 36 kV paper-insulated lead cables (PILC) and cross-linked polyethylene (XLPE) cables were compared. In [17], the impact of defects on cable joints was analyzed, and [18] studied the electric field in a cable termination undergoing transient stresses. During the project stage of a termination, another possible objective is to estimate areas more susceptible to defects and thus improve prototypes.…”

Section: Introductionmentioning

confidence: 99%

Design of Cable Termination for AC Breakdown Voltage Tests

et al. 2019

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International standards prescribe overvoltage tests to evaluate the insulating material performance of high-voltage cables. However, it is difficult to manage the electric fields at the cable ends when laboratory measurements are carried out because surface and external discharges occur at the cable termination. Therefore, this paper presents a procedure for designing cable terminations to reduce the electric field at the cable ends to appropriate levels even in the case of overvoltage tests. For this purpose, computer simulations of electric field distribution using the finite element method (FEM) were performed. A 35 kV cable model was employed as a sample. An voltage with RMS (root mean square) value of 300 kV was used as an overestimate of breakdown voltage for the internal insulating material. The cable termination model obtained through the proposed methodology allows an electric field reduction in air, preventing the occurrence of external discharges, and thus permitting the breakdown voltage measurement of the cable’s inner insulation.

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Electric stress analysis of a medium voltage cable termination subjected to standard and non-standard lightning impulse voltages

Cited by 5 publications

References 6 publications

Electric Intensity Distribution of Cross-Linked Polyethylene Based High-Voltage Cable Termination

Electric Intensity Distribution of Cross-Linked Polyethylene Based High-Voltage Cable Termination

On the Long-Period Accuracy Behavior of Inductive and Low-Power Instrument Transformers

Design of Cable Termination for AC Breakdown Voltage Tests

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