SEM and EDX analysis of the needle — Plane and the rod — Plane electrodes for the Partial Discharge Inception Voltage measurement and the arcing test of the mineral oil

2012 ◽  
Author(s):  
N. Pattanadech ◽  
F. Pratomosiwi ◽  
M. Muhr ◽  
M. Baur
Keyword(s):  
Partial Discharge ◽  
Mineral Oil ◽  
Voltage Measurement ◽  
Edx Analysis ◽  
Inception Voltage

scholarly journals Effect of Test Method and Needle Plane Configuration on Partial Discharge Inception Voltage Measurement of Mineral Oil based on Weibull Analysis

2013 ◽  
Vol 11 ◽  
pp. 411-418 ◽  
Author(s):  
T.F. Sipahutar ◽  
A.A. Kemma ◽  
N. Pattanadech ◽  
F. Pratomosiwi ◽  
Suwarno ◽  
...  
Keyword(s):  
Partial Discharge ◽  
Mineral Oil ◽  
Test Method ◽  
Weibull Analysis ◽  
Voltage Measurement ◽  
Inception Voltage

scholarly journals Ramp Rates Effect in Ramp Method for Partial Discharge Inception Voltage Measurement in Mineral Oil

2013 ◽  
Vol 11 ◽  
pp. 608-613
Author(s):  
A.A. Kemma ◽  
T.F. Sipahutar ◽  
N. Pattanadech ◽  
F. Pratomosiwi ◽  
Suwarno ◽  
...  
Keyword(s):  
Partial Discharge ◽  
Mineral Oil ◽  
Voltage Measurement ◽  
Inception Voltage

scholarly journals Pre-Breakdown and Breakdown Behavior of Synthetic and Natural Ester Liquids under AC Stress

Energies ◽  
2021 ◽  
Vol 15 (1) ◽  
pp. 167
Author(s):  
Beki Sékongo ◽  
Stephan Brettschneider ◽  
U. Mohan Rao ◽  
Issouf Fofana ◽  
Marouane Jabbari ◽  
...  
Keyword(s):  
Electric Field ◽  
Thermal Aging ◽  
Power Transformer ◽  
Partial Discharge ◽  
Service Condition ◽  
Mineral Oil ◽  
Radius Of Curvature ◽  
Long Term Behavior ◽  
Inception Voltage

In the last decades, a large focus is being placed on the sustainability and safety of the power transformer spectrum. Ester liquids, which have interesting properties such as high fire point and biodegradability, are gaining needed attraction. Since in-service condition, thermal aging deteriorates the physicochemical and electrical properties of liquid dielectrics, it is important to study their long-term behavior. In this contribution, the pre-breakdown and breakdown behavior of ester fluids (synthetic and natural) under AC stress are investigated. Important characteristics, such as partial discharge pre-inception voltage, partial discharge inception voltage, breakdown voltage, average streamer velocity, and inception electric field, were assessed. The influence of the radius of curvature (of high voltage needle electrode) as well as the thermal degradation of typical ester liquids are also discussed. Mineral oil was also included in the tests loop as a benchmark for comparative purposes. It is found that the pre-inception voltage of ester liquids was, in most cases, higher than that of mineral oil. For a given radius of curvature, the streamer inception and breakdown voltages decreased with thermal aging. During the streamer initiation, the electric field at the electrode tip decreased with the increase in the radius of curvature. The velocity of the streamers seems to increase with the decrease in the radius of curvature. The period of vulnerability, the so-called “delay time”, seems to be independent of the aging or the radius of curvature for a given condition of the liquid.

scholarly journals Comparative Tests of Partial Discharges in Nomex® 910 Paper and Cellulose Paper

Energies ◽  
2020 ◽  
Vol 13 (3) ◽  
pp. 647
Author(s):  
Hubert Moranda ◽  
Hanna Moscicka-Grzesiak ◽  
Piotr Przybylek ◽  
Krzysztof Walczak ◽  
Radoslaw Szewczyk
Keyword(s):  
Moisture Content ◽  
Partial Discharge ◽  
Mineral Oil ◽  
Partial Discharges ◽  
Comparative Tests ◽  
Cellulose Paper ◽  
Pure Cellulose ◽  
Insulation Systems ◽  
Four Levels ◽  
Inception Voltage

The article presents the results of comparative investigations of partial discharges in two insulation systems; aramid-enhanced cellulose paper-mineral oil, and pure cellulose paper-mineral oil. Partial discharges were investigated in a diagonal electric field with vertical and horizontal components. This field is treated as the most dangerous for insulation. The research was carried out on Nomex® 910 paper and cellulose paper samples, each paper being 0.25 mm thick. Samples of the two materials were tested at four levels of moisture. The inception voltage of partial discharges of all samples tested decreased as their moisture content increases. It was also proved that Nomex® 910 has a significantly higher partial discharge inception voltage than the cellulose paper, although this difference decreased with increasing moisture content.

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