Partial discharge pulse characteristics of electrical trees in XLPE cable insulation

Kalicki, T.; Braun, J.M.; Densley, J.; Fujimoto, Noboru; Sedding, H.G.

doi:10.1109/icsd.1995.523042

Cited by 4 publications

(1 citation statement)

References 3 publications

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“…Electrical treeing [1] is usually studied using samples with a pin plane electrode arrangement to produce a high local electric stress in the region of the pin tip. Under alternating applied voltages, partial discharges within the tree can be monitored by phase synchronous measurement of the shortduration (nanoseconds) [2] current pulses that occur in the external circuit. The current pulses arise due to a change in the induced image charge on the electrodes following an avalanche type discharge within the tree structure [3].…”

Section: Introductionmentioning

confidence: 99%

An approach to the modelling of partial discharges in electrical trees

Champion

Dodd

1998

J. Phys. D: Appl. Phys.

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A partial discharge model has been developed to simulate experimental partial discharge activity within electrical tree structures grown in polymeric based insulation. A pin plane electrode arrangement and tree were defined on a grid representing an area 2 mm by 2.1 mm. A sinusoidal 50 Hz voltage was applied to the pin tip and 3600 time steps per cycle were used to give a phase resolution of . Partial discharges were simulated at each time step by adding one or more dipoles of charge onto the tree structure to reduce the potential difference between adjacent points in the tree from to . Each dipole of charge represents a local electron avalanche occurring over a distance equal to the grid spacing. The model parameters, and , represent the discharge properties of the decomposition gas. Partial discharge current pulses in the external circuit and the induced image charge were calculated as a function of time. The spatial distribution of the emitted light in the tree structure over one cycle of the applied voltage was also calculated. The close agreement between the calculated and experimental data suggests that the underlying assumptions used in the construction of the partial discharge model are appropriate for the case of electrical trees grown in the flexible epoxy resin.

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Section: Introductionmentioning

confidence: 99%

An approach to the modelling of partial discharges in electrical trees

Champion

Dodd

1998

J. Phys. D: Appl. Phys.

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Automated recognition of partial discharges

Krivda

1995

IEEE Trans. Dielect. Electr. Insul.

195

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In this work an overview of automated recognition of partial discharges (PD) is given. The selection of PD patterns, extraction of relevant information for PD recognition and the structure of a data base for PD recognition are discussed. Mathematical methods useful for the design of the data base are examined. Classification methods are interpreted from a geometrical point of view. Some problems encountered in the automation of PD recognition also are addressed.

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