Details
| Original language | English |
|---|---|
| Pages (from-to) | 119-126 |
| Number of pages | 8 |
| Journal | IEEE Transactions on Dielectrics and Electrical Insulation |
| Volume | 29 |
| Issue number | 1 |
| Publication status | Published - 31 Jan 2022 |
Abstract
The present article studies the effects of temperature and stress type on the oil/pressboard creeping discharge under divergent ac voltages. A ramp-stress test determines the short-time electric strengths of the oil/pressboard interface. Subsequently, long-term tests are carried out at different temperatures using constant and step stresses, respectively. Afterward, a novel methodology is proposed to detect the developing fault using synchronous partial discharge (PD) and online dielectric measurements. The interface short-time electric strengths correlate positively with the temperature. In long-term tests, the creeping discharges can generate three failure modes to oil/pressboard insulation: interface flashover (FO), surface tracking (ST), and internal treeing (IT). Different failure modes vary significantly in the discharge characteristics and the severities of damage to the pressboard. Temperature plays an important role in determining the failure modes of creeping discharge, and its influence mechanism is expounded in terms of the change of material properties, the interface of electric and dielectric phenomena, and their sophisticated interplays. The influence of stress type is related to the cumulative effect of stressing and the voltage rising steepness. The proposed methodology proves to be a potent tool in detecting the developing IT.
Keywords
- Dielectric breakdown, electrothermal effects, interface phenomena, partial discharges (PDs), surface discharges, tracking
ASJC Scopus subject areas
- Engineering(all)
- Electrical and Electronic Engineering
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In: IEEE Transactions on Dielectrics and Electrical Insulation, Vol. 29, No. 1, 31.01.2022, p. 119-126.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Study of Oil/Pressboard Creeping Discharges under Divergent AC Voltage - Part III
T2 - Effects of Temperature and Stress Type
AU - Zhou, Xin
AU - Werle, Peter
AU - Gockenbach, Ernst
AU - Imani, Mohammad Taghi
PY - 2022/1/31
Y1 - 2022/1/31
N2 - The present article studies the effects of temperature and stress type on the oil/pressboard creeping discharge under divergent ac voltages. A ramp-stress test determines the short-time electric strengths of the oil/pressboard interface. Subsequently, long-term tests are carried out at different temperatures using constant and step stresses, respectively. Afterward, a novel methodology is proposed to detect the developing fault using synchronous partial discharge (PD) and online dielectric measurements. The interface short-time electric strengths correlate positively with the temperature. In long-term tests, the creeping discharges can generate three failure modes to oil/pressboard insulation: interface flashover (FO), surface tracking (ST), and internal treeing (IT). Different failure modes vary significantly in the discharge characteristics and the severities of damage to the pressboard. Temperature plays an important role in determining the failure modes of creeping discharge, and its influence mechanism is expounded in terms of the change of material properties, the interface of electric and dielectric phenomena, and their sophisticated interplays. The influence of stress type is related to the cumulative effect of stressing and the voltage rising steepness. The proposed methodology proves to be a potent tool in detecting the developing IT.
AB - The present article studies the effects of temperature and stress type on the oil/pressboard creeping discharge under divergent ac voltages. A ramp-stress test determines the short-time electric strengths of the oil/pressboard interface. Subsequently, long-term tests are carried out at different temperatures using constant and step stresses, respectively. Afterward, a novel methodology is proposed to detect the developing fault using synchronous partial discharge (PD) and online dielectric measurements. The interface short-time electric strengths correlate positively with the temperature. In long-term tests, the creeping discharges can generate three failure modes to oil/pressboard insulation: interface flashover (FO), surface tracking (ST), and internal treeing (IT). Different failure modes vary significantly in the discharge characteristics and the severities of damage to the pressboard. Temperature plays an important role in determining the failure modes of creeping discharge, and its influence mechanism is expounded in terms of the change of material properties, the interface of electric and dielectric phenomena, and their sophisticated interplays. The influence of stress type is related to the cumulative effect of stressing and the voltage rising steepness. The proposed methodology proves to be a potent tool in detecting the developing IT.
KW - Dielectric breakdown
KW - electrothermal effects
KW - interface phenomena
KW - partial discharges (PDs)
KW - surface discharges
KW - tracking
UR - http://www.scopus.com/inward/record.url?scp=85124235645&partnerID=8YFLogxK
U2 - 10.1109/TDEI.2022.3146432
DO - 10.1109/TDEI.2022.3146432
M3 - Article
AN - SCOPUS:85124235645
VL - 29
SP - 119
EP - 126
JO - IEEE Transactions on Dielectrics and Electrical Insulation
JF - IEEE Transactions on Dielectrics and Electrical Insulation
SN - 1070-9878
IS - 1
ER -