Details
| Original language | English |
|---|---|
| Pages (from-to) | 1007-1015 |
| Number of pages | 9 |
| Journal | IEEE Transactions on Electrical Insulation |
| Volume | 28 |
| Issue number | 6 |
| Publication status | Published - Dec 1993 |
Abstract
This paper deals with the PD behavior of epoxy resin transformer coils in a temperature range between −30 and 180°C. In particular the PD inception voltage as a very important parameter for the judgement of the PD characteristic of a transformer over the temperature is considered. The PD inception voltage is determined at different static temperatures in step test. The tempering of the coils occur from the outside by submerging the coil in tempered fluid, as well as from inside, with the help of current losses. Models of HV coils of distribution transformers are used as specimen. The windings of the coils consist of wires which have different insulation. Some windings consist of wires with a thin layer of varnish. The others have wires with a glass-silk wrapped insulation. The dependencies between the PD inception voltage of the coils and parameters such as wire insulation and inner or outer tempering are determined and discussed. Furthermore the results of long term tests are introduced in which five coils are stressed with a voltage of 1.75 kV at a temperature of 175°C for a duration of 1 yr. During this time PD measurements with a sensitivity of 2 pC were carried out.
ASJC Scopus subject areas
- Engineering(all)
- General Engineering
- Engineering(all)
- Electrical and Electronic Engineering
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In: IEEE Transactions on Electrical Insulation, Vol. 28, No. 6, 12.1993, p. 1007-1015.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - The relation between thermal and electrical stress and the PD behavior of Epoxy-resin Transformers
AU - Borsi, H.
N1 - Copyright: Copyright 2015 Elsevier B.V., All rights reserved.
PY - 1993/12
Y1 - 1993/12
N2 - This paper deals with the PD behavior of epoxy resin transformer coils in a temperature range between −30 and 180°C. In particular the PD inception voltage as a very important parameter for the judgement of the PD characteristic of a transformer over the temperature is considered. The PD inception voltage is determined at different static temperatures in step test. The tempering of the coils occur from the outside by submerging the coil in tempered fluid, as well as from inside, with the help of current losses. Models of HV coils of distribution transformers are used as specimen. The windings of the coils consist of wires which have different insulation. Some windings consist of wires with a thin layer of varnish. The others have wires with a glass-silk wrapped insulation. The dependencies between the PD inception voltage of the coils and parameters such as wire insulation and inner or outer tempering are determined and discussed. Furthermore the results of long term tests are introduced in which five coils are stressed with a voltage of 1.75 kV at a temperature of 175°C for a duration of 1 yr. During this time PD measurements with a sensitivity of 2 pC were carried out.
AB - This paper deals with the PD behavior of epoxy resin transformer coils in a temperature range between −30 and 180°C. In particular the PD inception voltage as a very important parameter for the judgement of the PD characteristic of a transformer over the temperature is considered. The PD inception voltage is determined at different static temperatures in step test. The tempering of the coils occur from the outside by submerging the coil in tempered fluid, as well as from inside, with the help of current losses. Models of HV coils of distribution transformers are used as specimen. The windings of the coils consist of wires which have different insulation. Some windings consist of wires with a thin layer of varnish. The others have wires with a glass-silk wrapped insulation. The dependencies between the PD inception voltage of the coils and parameters such as wire insulation and inner or outer tempering are determined and discussed. Furthermore the results of long term tests are introduced in which five coils are stressed with a voltage of 1.75 kV at a temperature of 175°C for a duration of 1 yr. During this time PD measurements with a sensitivity of 2 pC were carried out.
UR - http://www.scopus.com/inward/record.url?scp=0027805928&partnerID=8YFLogxK
U2 - 10.1109/14.249374
DO - 10.1109/14.249374
M3 - Article
AN - SCOPUS:0027805928
VL - 28
SP - 1007
EP - 1015
JO - IEEE Transactions on Electrical Insulation
JF - IEEE Transactions on Electrical Insulation
SN - 0018-9367
IS - 6
ER -