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Partial Discharge Location in High Voltage Transformers

Partial Discharge Location in High Voltage Transformers
Partial Discharge Location in High Voltage Transformers
Partial discharge (PD) location is a common problem within Power Transformers diagnostics and is important for assessing the severity of any detected fault. The technique presented in this paper is suitable for any type of discharge signal through determination of the predominantly capacitive operating region in the frequency domain of the transformer. Theoretically, any components signal in this frequency region will retain their waveshape and phase without significant attenuation. To obtain the predominantly capacitive region of a transformer winding, the relationship between the bushing terminal and neutral terminal has to be determined. In the predominantly capacitive region the two terminals will have a linear relationship in dB. To obtain the model of the transformer winding under test, it is injected at one end with a low voltage calibrated impulse to determine its initial parameters. Based on the measurement at the bushing and neutral terminals, the linear relationship of the two terminals is found by a fixed distribution equation derived from a lumped circuit parameter model. For verification, experiments within the laboratory have used various artificial PD signals injected at different points along a model winding to represent different PD sources. By considering the relative magnitude of a discharge signal at predominantly capacitive frequencies of the winding it is possible to evaluate the position of the discharge source.
978-1-4244-3917-1
200-204
Mohamed, R
541bddba-9997-4f3f-a82a-3e055c173974
Lewin, P L
78b4fc49-1cb3-4db9-ba90-3ae70c0f639e
Mohamed, R
541bddba-9997-4f3f-a82a-3e055c173974
Lewin, P L
78b4fc49-1cb3-4db9-ba90-3ae70c0f639e

Mohamed, R and Lewin, P L (2009) Partial Discharge Location in High Voltage Transformers. 2009 IEEE Electrical Insulation Conference, Canada. 31 May - 03 Jun 2009. pp. 200-204 .

Record type: Conference or Workshop Item (Paper)

Abstract

Partial discharge (PD) location is a common problem within Power Transformers diagnostics and is important for assessing the severity of any detected fault. The technique presented in this paper is suitable for any type of discharge signal through determination of the predominantly capacitive operating region in the frequency domain of the transformer. Theoretically, any components signal in this frequency region will retain their waveshape and phase without significant attenuation. To obtain the predominantly capacitive region of a transformer winding, the relationship between the bushing terminal and neutral terminal has to be determined. In the predominantly capacitive region the two terminals will have a linear relationship in dB. To obtain the model of the transformer winding under test, it is injected at one end with a low voltage calibrated impulse to determine its initial parameters. Based on the measurement at the bushing and neutral terminals, the linear relationship of the two terminals is found by a fixed distribution equation derived from a lumped circuit parameter model. For verification, experiments within the laboratory have used various artificial PD signals injected at different points along a model winding to represent different PD sources. By considering the relative magnitude of a discharge signal at predominantly capacitive frequencies of the winding it is possible to evaluate the position of the discharge source.

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More information

Published date: 31 May 2009
Additional Information: Event Dates: 31 May - 3 June 2009
Venue - Dates: 2009 IEEE Electrical Insulation Conference, Canada, 2009-05-31 - 2009-06-03
Organisations: Electronics & Computer Science, EEE

Identifiers

Local EPrints ID: 267559
URI: https://eprints.soton.ac.uk/id/eprint/267559
ISBN: 978-1-4244-3917-1
PURE UUID: b5c3d157-0140-4f9e-83a8-d290cec2220b

Catalogue record

Date deposited: 12 Jun 2009 16:06
Last modified: 19 Jul 2019 22:18

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Contributors

Author: R Mohamed
Author: P L Lewin

University divisions

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