Details
| Original language | English |
|---|---|
| Pages (from-to) | 1118-1126 |
| Number of pages | 9 |
| Journal | IEEE Transactions on Electrical Insulation |
| Volume | 27 |
| Issue number | 6 |
| Publication status | Published - Dec 1992 |
Abstract
This paper describes partial discharge (PD) investigations on industrially made epoxy-resin-impregnated transformer coils and coils produced under laboratory conditions in a temperature range between −30 and 180°C. The PD characteristics of the industrial coils can be reproduced with the simplified lab coils, and these results can be transferred to the industrial coils. The PD measurements show that the PD inception voltage decreases with rising temperature, which is explained with the superposition of two temperature-dependent phenomena. Firstly, the temperature-dependent rising values of the relative permittivity of the epoxy resin strengthen the electrical field inside the gas cavity. Secondly, the ignition condition, i.e. the relative gas density in the cavity, changes due to diffusion. From the observed voltage dependence of the repetition rate and phase position of the PD pulses and, with the help of a capacitive electrical circuit, it is shown that the measured PD’s are discharges in gas-filled cavities.
ASJC Scopus subject areas
- Engineering(all)
- Engineering(all)
- Electrical and Electronic Engineering
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In: IEEE Transactions on Electrical Insulation, Vol. 27, No. 6, 12.1992, p. 1118-1126.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Partial Discharge Behavior of Epoxy Resin-impregnated Transformer Coils
AU - Borsi, H.
AU - Cachay, O.
N1 - Copyright: Copyright 2015 Elsevier B.V., All rights reserved.
PY - 1992/12
Y1 - 1992/12
N2 - This paper describes partial discharge (PD) investigations on industrially made epoxy-resin-impregnated transformer coils and coils produced under laboratory conditions in a temperature range between −30 and 180°C. The PD characteristics of the industrial coils can be reproduced with the simplified lab coils, and these results can be transferred to the industrial coils. The PD measurements show that the PD inception voltage decreases with rising temperature, which is explained with the superposition of two temperature-dependent phenomena. Firstly, the temperature-dependent rising values of the relative permittivity of the epoxy resin strengthen the electrical field inside the gas cavity. Secondly, the ignition condition, i.e. the relative gas density in the cavity, changes due to diffusion. From the observed voltage dependence of the repetition rate and phase position of the PD pulses and, with the help of a capacitive electrical circuit, it is shown that the measured PD’s are discharges in gas-filled cavities.
AB - This paper describes partial discharge (PD) investigations on industrially made epoxy-resin-impregnated transformer coils and coils produced under laboratory conditions in a temperature range between −30 and 180°C. The PD characteristics of the industrial coils can be reproduced with the simplified lab coils, and these results can be transferred to the industrial coils. The PD measurements show that the PD inception voltage decreases with rising temperature, which is explained with the superposition of two temperature-dependent phenomena. Firstly, the temperature-dependent rising values of the relative permittivity of the epoxy resin strengthen the electrical field inside the gas cavity. Secondly, the ignition condition, i.e. the relative gas density in the cavity, changes due to diffusion. From the observed voltage dependence of the repetition rate and phase position of the PD pulses and, with the help of a capacitive electrical circuit, it is shown that the measured PD’s are discharges in gas-filled cavities.
UR - http://www.scopus.com/inward/record.url?scp=0001517458&partnerID=8YFLogxK
U2 - 10.1109/14.204862
DO - 10.1109/14.204862
M3 - Article
AN - SCOPUS:0001517458
VL - 27
SP - 1118
EP - 1126
JO - IEEE Transactions on Electrical Insulation
JF - IEEE Transactions on Electrical Insulation
SN - 0018-9367
IS - 6
ER -