Dielectric properties of natural ester, synthetic ester midel 7131 and mineral oil diala D

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Jing, Yi and Timoshkin, Igor and Wilson, Mark and Given, M and MacGregor, Scott and Wang, Tao and Lehr, J.M. (2014) Dielectric properties of natural ester, synthetic ester midel 7131 and mineral oil diala D. IEEE Transactions on Dielectrics and Electrical Insulation, 21 (2). pp. 644-652. ISSN 1070-9878 (https://doi.org/10.1109/TDEI.2013.003917)

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Abstract

The insulating liquids used in industrial applications are typically mineral oils. In recent years however, significant attention has been paid to alternative insulating fluids, including synthetic and natural ester liquids. In order to expand their practical applications, it is important to have detailed information on their dielectric properties. In this present paper, the dielectric properties of synthetic ester, Midel 7131; mineral oil, Shell Diala D; and vegetable (rapeseed) oil have been investigated. It has been shown that Midel 7131 has a higher ac breakdown voltage (27.6 kV) as compared with Diala D oil (26.4 kV) and rapeseed oil (24.6 kV). However, the breakdown voltage of the Diala D oil has the smallest standard deviation (7%) amongst the tested liquids (13% for Midel 7131 and 11% for rapeseed oil). Statistical analysis of the breakdown voltages has been conducted and it has been shown that the ac breakdown voltages can be described by a normal distribution. dc I-V characteristics have been measured and the space charge saturation regime has been observed for all three liquids starting from ~9 kV for positive energisation and ~10 kV for negative energisation in the point-plane topology. Apparent mobilities of the charge carriers in the tested liquids have been obtained using I1/2-V curves; these mobilities can be used for calculation of the space charge influenced distribution of the electric field in liquid insulators stressed with dc voltage. Such analysis can be important for design and exploitation of HVDC power systems

ORCID iDs

Jing, Yi ORCID logoORCID: https://orcid.org/0000-0003-0874-9967, Timoshkin, Igor ORCID logoORCID: https://orcid.org/0000-0002-0380-9003, Wilson, Mark ORCID logoORCID: https://orcid.org/0000-0003-3088-8541, Given, M ORCID logoORCID: https://orcid.org/0000-0002-6354-2486, MacGregor, Scott ORCID logoORCID: https://orcid.org/0000-0002-0808-585X, Wang, Tao ORCID logoORCID: https://orcid.org/0000-0003-3054-0772 and Lehr, J.M.;
  • Item type:Article
    ID code:47886
    Dates:
    Date
    Event
    April 2014
    Published
    Notes:(c) 2014 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other users, including reprinting/ republishing this material for advertising or promotional purposes, creating new collective works for resale or redistribution to servers or lists, or reuse of any copyrighted components of this work in other works.
    Subjects:Technology > Electrical engineering. Electronics Nuclear engineering
    Department:Faculty of Engineering > Electronic and Electrical Engineering
    Depositing user: Pure Administrator
    Date deposited:07 May 2014 13:13
    Last modified:22 Dec 2024 01:15
    Related URLs:
    URI:https://strathprints.strath.ac.uk/id/eprint/47886
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