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Data recovery algorithm in space charge measurement by PEA method

Data recovery algorithm in space charge measurement by PEA method
Data recovery algorithm in space charge measurement by PEA method
Purpose – The pulsed electro-acoustic method is widely applied for space charge measurement in solid dielectrics. The signals, however, can be seriously distorted during transmission, especially in non-planar specimens. The purpose of this paper is to find an efficient algorithm to correctly recover the space charge profile for different types of specimens.

Design/methodology/approach – The distortion can be associated with both geometry and material (attenuation and dispersion). Hence the recovery algorithm consists of two parts, respectively. The influences of geometries, causing the divergences of electric force and acoustic waveform, can be corrected by sets of factors. The attenuation and dispersion of the material can be suppressed based on the transfer function matrix in frequency domain, which could be obtained from calibration.

Findings – A general algorithm applicable to three kinds of specimens (single-layer, multi-layer and coaxial-geometry dielectrics) has been proposed. Compared with the other two algorithms in literature, the present one offers the most accurate solution while taking relatively shorter time. In addition, this algorithm is applied on signals measured from a planar low-density polyethylene sample and the results show that the new algorithm is fairly effective with excellent stability in a real system.

Originality/value – As one of the most accurate algorithms, the present one is theoretically one-third quicker than the others. This algorithm would be helpful in applications calling for large calculations, i.e. 3D imaging of space charge distribution in XLPE cable.
0332-1649
1136-1149
Han, Zhengyi
d81711f1-3f60-45fc-a4c8-30080cea91f9
Chen, George
3de45a9c-6c9a-4bcb-90c3-d7e26be21819
Cao, Junzheng
cf3a832d-7db0-48a0-a665-4b28ec9c138c
He, Zhiyuan
03f87a01-6590-4713-9b97-a8f1dddeb20f
Wang, Haitian
7f867657-bb51-48a8-ad1a-98241c1d02b9
Li, Wenpeng
9b375ed5-a556-4879-8a34-4cd61ec0825b
Tang, Chao
dcd2c9bd-9fa4-4b23-bb5b-b0295aaba4cf
Han, Zhengyi
d81711f1-3f60-45fc-a4c8-30080cea91f9
Chen, George
3de45a9c-6c9a-4bcb-90c3-d7e26be21819
Cao, Junzheng
cf3a832d-7db0-48a0-a665-4b28ec9c138c
He, Zhiyuan
03f87a01-6590-4713-9b97-a8f1dddeb20f
Wang, Haitian
7f867657-bb51-48a8-ad1a-98241c1d02b9
Li, Wenpeng
9b375ed5-a556-4879-8a34-4cd61ec0825b
Tang, Chao
dcd2c9bd-9fa4-4b23-bb5b-b0295aaba4cf

Han, Zhengyi, Chen, George, Cao, Junzheng, He, Zhiyuan, Wang, Haitian, Li, Wenpeng and Tang, Chao (2016) Data recovery algorithm in space charge measurement by PEA method. COMPEL: The International Journal for Computation and Mathematics in Electrical and Electronic Engineering, 35 (3), 1136-1149. (doi:10.1108/COMPEL-10-2015-0365).

Record type: Article

Abstract

Purpose – The pulsed electro-acoustic method is widely applied for space charge measurement in solid dielectrics. The signals, however, can be seriously distorted during transmission, especially in non-planar specimens. The purpose of this paper is to find an efficient algorithm to correctly recover the space charge profile for different types of specimens.

Design/methodology/approach – The distortion can be associated with both geometry and material (attenuation and dispersion). Hence the recovery algorithm consists of two parts, respectively. The influences of geometries, causing the divergences of electric force and acoustic waveform, can be corrected by sets of factors. The attenuation and dispersion of the material can be suppressed based on the transfer function matrix in frequency domain, which could be obtained from calibration.

Findings – A general algorithm applicable to three kinds of specimens (single-layer, multi-layer and coaxial-geometry dielectrics) has been proposed. Compared with the other two algorithms in literature, the present one offers the most accurate solution while taking relatively shorter time. In addition, this algorithm is applied on signals measured from a planar low-density polyethylene sample and the results show that the new algorithm is fairly effective with excellent stability in a real system.

Originality/value – As one of the most accurate algorithms, the present one is theoretically one-third quicker than the others. This algorithm would be helpful in applications calling for large calculations, i.e. 3D imaging of space charge distribution in XLPE cable.

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Accepted/In Press date: 29 December 2015
Published date: 3 March 2016
Organisations: EEE

Identifiers

Local EPrints ID: 402961
URI: http://eprints.soton.ac.uk/id/eprint/402961
ISSN: 0332-1649
PURE UUID: 68a77a2c-2565-4d57-b802-139cf6eab370

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Date deposited: 21 Nov 2016 10:28
Last modified: 19 Jul 2019 19:35

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Contributors

Author: Zhengyi Han
Author: George Chen
Author: Junzheng Cao
Author: Zhiyuan He
Author: Haitian Wang
Author: Wenpeng Li
Author: Chao Tang

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