Investigation of the Influence of Plastic Evaporation on Pressure Rise due to Fault Arcs in Electrical Installations
Keywords:
Internal arcs, plastic evaporation, pressure calculationsAbstract
Internal arcs in electrical installations cause a sudden pressure rise due to heating of the gas surrounding
the arc. The pressure rise may endanger personnel, the electrical installation and even the switchgear
building. Based on the need to design switchgear more compact, plastic materials are used. The interaction
of the arc with these materials releases gases by evaporation and thereby influences the pressure rise
within the installation as well as the energy balance of the arc. In order to analyse these effects in detail,
some commonly used plastics are exposed to a high current arc. In this contribution the pressure development
in a closed vessel equipped with different plastic materials, their mass losses and the portion of
electrical energy causing overpressure, known as thermal transfer coefficient or kp–factor, are determined
at three values of the filling pressure of the vessel. The plastic materials under investigation are epoxy,
polyamide 6.6, polybutyleneterephtalate, polycarbonate and silicone rubber. With the information provided,
the influence of the different plastics on pressure development can be predicted.
References
Primus I – F, Compact Substations (in German), VDE Verlag, EW Medien und Kongresse,2009.
Schneider, PI100: up to 24 kV, Air insulated switchgear for primary distribution, project planning notes (in German), Schneider Electric, 2011.
Hochhaus H, Investigation of the interaction between switching arcs and insulating walls (inGerman), PhD thesis, Techn. University Braunschweig, Braunschweig, 1985.
Kaltenborn U, On thermal effects of internal arcs on plastic materials in electrical installations (in German), PhD thesis, Techn. University Darmstadt, 1998.
Finke S, Effects of internal arcs on plastic walls in low voltage switchgear (in German), PhD thesis, Techn. Univ. Darmstadt, 2005.
Dominghaus H, Plastics: Properties and Applications (in German), Springer Verlag, 2012.
Downloads
Published
Issue
Section
License
Copyright (c) 2015 S. Wetzeler, G. J. Pietsch
This work is licensed under a Creative Commons Attribution 3.0 Unported License.
Authors who publish with this journal agree to the following terms:
- Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
- Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
- Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).