Partial discharge in medium voltage three-phase cables

Hunter, J. A.; Lv, Hao; Swaffield, D.J.; Lewin, P.L.; Cornish, N.; Walton, C.; Michel, M.

doi:10.1109/elinsl.2010.5549544

Cited by 10 publications

(10 citation statements)

References 5 publications

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“…A key example of this are experiments on three-phase belted paper insulated lead covered (PILC) cables under field conditions in [6], [7]. PILC cable is widely used in the London underground network, which is now reaching the end of its design lifetime [7], making its study highly relevant. In this paper, experimental PD data from an artificially created spike defect in a PILC cable joint will be modelled [7].…”

Section: Introductionmentioning

confidence: 99%

Physical models for field based partial discharge measurements

George

Hunter

Rapisarda

et al. 2015

2015 IEEE Electrical Insulation Conference (EIC)

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Current models of partial discharge (PD) behaviour are focused on the reproduction of deterministic, experimental data. This data is traditionally taken under strictly controlled conditions and thus exhibits minimal noise. This contrasts field PD measurements which exhibit high levels of stochasticity and extreme sensitivity to on-site conditions. In this paper partial discharge measurements are simulated from three-phase cable experiments, which aim to imitate conditions found in the field. The results show good agreement between experimental and simulated data, in terms of both phase resolved plots and non-linear invariants. The numerous additions and improvements required to describe PD behaviour in field equipment are discussed, and will form the basis for future work.

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Section: Introductionmentioning

confidence: 99%

Physical models for field based partial discharge measurements

George

Hunter

Rapisarda

et al. 2015

2015 IEEE Electrical Insulation Conference (EIC)

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“…The model results are independent of time step choice, as long as it is sufficiently small compared to the length of the AC cycle; in this work the time step, Δ , is set to 1×10 -5 s. If both the field condition, equation (10), and the free electron condition, equation (12), are met then a PD will occur at that inception point. Both conditions must be considered at each point in turn so the ordering of the points is randomly permuted at each time step to remove bias.…”

Section: Pd Inceptionmentioning

confidence: 99%

“…The input unit from the measuring equipment was connected in series with 1 nF blocking capacitor on each cable phase. The entire [9,10,12]. The cable sample is 10 m and contains a threephase straight lead joint with a spike defect on phase 2. experiment was performed at rated volts which corresponds to 11 kV root mean square (RMS) line to line voltage at 50 Hz.…”

Section: Partial Discharge Experimentsmentioning

confidence: 99%

“…Initially the conductor temperature of the joint was held at 16 °C and no PD activity distinct from the background noise from cable terminations was measured [12]. The conductor temperature was then raised to 65 °C and PD measurements taken as the sample cooled.…”

Section: Partial Discharge Experimentsmentioning

confidence: 99%

“…The conductor temperature was then raised to 65 °C and PD measurements taken as the sample cooled. The conductor temperature was determined by measuring the surface temperature of the joint and using thermal calibration data [12]. At higher temperatures PD activity distinct from the background noise was observed.…”

Section: Partial Discharge Experimentsmentioning

confidence: 99%

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Modeling partial discharge in a three-phase cable joint experiment with minimal adjustable parameters

George

Lewin

Hunter

et al. 2017

IEEE Trans. Dielect. Electr. Insul.

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A general physical model of partial discharge (PD) has been developed and used to simulate discharges within a void at the tip of a metallic spike defect within a three-phase 11 kV paper insulated lead covered (PILC) cable joint. Discharges are modeled by altering surface charge density at the void boundary using a logistic function distribution. The model was validated against experimental data, and a good agreement was observed with minimal free parameters. The model was then used to investigate the impact of single phase energization on PD activity in three-phase PILC cable joints. It was concluded that PD testing of three-phase PILC cable joints should be performed at raised temperatures with the cable fully energized as this results in a higher frequency of PD activity, and reduces the level of background PD from cable terminations. This research represents a further step towards developing PD models that can describe measurements taken from operational high voltage plant.

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