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Conduction current measurements on polycarbonates subjected to electrical and thermal stress
2000 Annual Report Conference on Electrical Insulation and Dielectric Phenomena (Cat. No.00CH37132)
Year: 2000 | Conference Paper |
Cited by: Papers (10)
Results of conduction current measurements on Polycarbonate samples which underwent simultaneous electrical and thermal aging are reported. By recording the conduction current for different values of the electric field strength a transition from ohmic to high field conduction was observed. Such a characteristic change in the slope of the conduction current as function of the poling field is called...Show More
Digital HVDC partial discharge testing
Conference Record of the 2000 IEEE International Symposium on Electrical Insulation (Cat. No.00CH37075)
Year: 2000 | Conference Paper |
Cited by: Papers (15)
The measuring circuit for measuring Partial Discharges (PDs) does not differ when using AC or DC voltage. What differs is the analysis of the measured data. First, because there is no phase resolved information. Secondly, because of the much lower repetition rates. In addition, AC and DC high voltage applications tend to be quite different. With a new digital PD detector, the HVDC PD testing can b...Show More
Investigation on charging and polarization effects at dielectric interfaces in laminated HVDC insulation
1999 Annual Report Conference on Electrical Insulation and Dielectric Phenomena (Cat. No.99CH36319)
Year: 1999 | Conference Paper |
Cited by: Papers (11)
Conduction current measurements in conjunction with space charge measurements provide deeper insight into the charging behavior of an insulation than one method alone. In this paper results from both test methods obtained for materials used in the construction of solid/liquid laminates are discussed. Special attention is given the comparison between measurable and theoretical values of the amount ...Show More
In non-energy high voltage DC applications often a combination of solid and liquid insulating materials is used. Despite this fact, investigations into the space charge behavior of such laminates are scarce. In this paper tests on samples made of polycarbonates (PC) and transformer oil are discussed. The results were reproducible and showed exclusively homocharge. At each interface between the dif...Show More
Partial discharge. Part XXIV: The analysis of PD in HVDC equipment
High voltage dc is required in a wide range of consumer, commercial, and military applications. Presently available PD analysis for dc systems can extend far beyond the old-fashioned "not more than 'n' PD pulses per minute over a given magnitude".Show More
Quality assessment of HVDC components by PD analysis
IEEE 1997 Annual Report Conference on Electrical Insulation and Dielectric Phenomena
Year: 1997 | Conference Paper |
Cited by: Papers (10)
HVDC components for both energy (HVDC submarine cables) and non-energy (X-ray equipment, television screens, travelling wave tubes) applications can successfully be tested for partial discharges (PD). Contrary to the situation for ac equipment that is used for the electrical energy supply (IEC270), no detailed PD testing procedures are available for dc. ASTM 1868 only mentions "repetitive pulses o...Show More
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