| Zugriffsnummer | 28680 |
| Dokumenttyp | Zeitschriftenartikel |
| Sprache | Englisch |
| Titel | Experimental investigations on the measuring uncertainty in recording brush discharges from insulating surfaces by coulombmeters |
| Autor(in); Institution |
Chowdhury, Kanchan; Cryogenic Engineering Centre India, Institute of Technology, Kharagpur, INDIA
Pidoll, Ulrich von; 3.7, Zündquellensicherheit, PTB-Braunschweig
Langer, Tim; 3.5, Zünddurchschlagsprozesse, PTB-Braunschweig
Möckel, Dieter; 3.7, Zündquellensicherheit, PTB-Braunschweig
Beyer, Michael; 3.7, Zündquellensicherheit, PTB-Braunschweig
|
| Quelle/Jahr | Journal of Electrostatics: 70 (2012), 4, 347 - 355 |
| ISSN | 0304-3886 (PRINT) ; 0304-3886 (ONLINE) |
| Verlag | Amsterdam [u.a.]: Elsevier Science |
| Freie Schlagworte | Büschelentladungen ; Messen ; Coulombmeter ; Messunsicherheit |
| Zusammenfassung | In the present work, experimental results on the measurements of the total charge on a charged sheet before and after a provoked brush discharge, their difference “C”, the induced charge “A” on different probes immediately before the discharge and their transferred charge “B” measured by commercially available Coulombmeters have been measured for a large number of probes from 2 mm to 25 mm in diameter including human thumb and shielded probe. The brush discharges were provoked on PTFE discs 10 cm to 20 cm in diameters having a distance from the grounded base of 3 cm to 20 cm. The results obtained can be used for correct estimation of the incendivity of brush discharges between 10 nC and 90 nC. The found measurement underestimation B/C depends on the type of Coulombmeter and was lower than calculated in the literature, but shows the expected trends. Due to observed corona losses, multiple brush discharges and high safety margins of the hitherto used threshold limits there seems to be no need to revise the existing threshold limits of 60 nC, 30 nC and 10 nC for explosion groups IIA, IIB and IIC. |
