Details
| Original language | English |
|---|---|
| Pages (from-to) | 425-431 |
| Number of pages | 7 |
| Journal | IEEE Transactions on Power Delivery |
| Volume | 21 |
| Issue number | 1 |
| Publication status | Published - Jan 2006 |
Abstract
In order to determine the pressure rise due to fault arcs in electrical installations, the portion of energy heating the surrounding gas of the fault arc has to be known. The ratio of the portion of energy to the electrical energy, the thermal transfer coefficient, well known in literature as κp-factor, is adopted here. This paper presents a theoretical approach to calculate the thermal transfer coefficient κp and to determine the pressure rise in an electrical installation. It is based on the solution of the fundamental hydro- and thermodynamic conservation equations taking into account melting and evaporation of metals as well as chemical reactions with the surrounding gas of the fault arc. The results for closed arc chambers show that factors such as the kinds of insulating gas and of electrode material, the size of the test vessel, and the gas density considerably influence the thermal transfer coefficient and thus the pressure rise. Furthermore it is demonstrated, with an example of a short-circuit in a compact medium-voltage station with heavy metal evaporation, that the mathematical approach is a reliable tool to assess the development of pressure.
Keywords
- Chemical reaction, Electrical installation, Energy balance, Fault arc, Hydro- and thermodynamics, Melting and evaporation, Pressure, Relative purity, Theoretical approach, Thermal transfer coefficient
ASJC Scopus subject areas
- Energy(all)
- Energy Engineering and Power Technology
- Engineering(all)
- Electrical and Electronic Engineering
Cite this
- Standard
- Harvard
- Apa
- Vancouver
- BibTeX
- RIS
In: IEEE Transactions on Power Delivery, Vol. 21, No. 1, 01.2006, p. 425-431.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Investigation of the thermal transfer coefficient by the energy balance of fault arcs in electrical installations
AU - Zhang, X.
AU - Pietsch, Gerhard
AU - Gockenbach, Ernst
PY - 2006/1
Y1 - 2006/1
N2 - In order to determine the pressure rise due to fault arcs in electrical installations, the portion of energy heating the surrounding gas of the fault arc has to be known. The ratio of the portion of energy to the electrical energy, the thermal transfer coefficient, well known in literature as κp-factor, is adopted here. This paper presents a theoretical approach to calculate the thermal transfer coefficient κp and to determine the pressure rise in an electrical installation. It is based on the solution of the fundamental hydro- and thermodynamic conservation equations taking into account melting and evaporation of metals as well as chemical reactions with the surrounding gas of the fault arc. The results for closed arc chambers show that factors such as the kinds of insulating gas and of electrode material, the size of the test vessel, and the gas density considerably influence the thermal transfer coefficient and thus the pressure rise. Furthermore it is demonstrated, with an example of a short-circuit in a compact medium-voltage station with heavy metal evaporation, that the mathematical approach is a reliable tool to assess the development of pressure.
AB - In order to determine the pressure rise due to fault arcs in electrical installations, the portion of energy heating the surrounding gas of the fault arc has to be known. The ratio of the portion of energy to the electrical energy, the thermal transfer coefficient, well known in literature as κp-factor, is adopted here. This paper presents a theoretical approach to calculate the thermal transfer coefficient κp and to determine the pressure rise in an electrical installation. It is based on the solution of the fundamental hydro- and thermodynamic conservation equations taking into account melting and evaporation of metals as well as chemical reactions with the surrounding gas of the fault arc. The results for closed arc chambers show that factors such as the kinds of insulating gas and of electrode material, the size of the test vessel, and the gas density considerably influence the thermal transfer coefficient and thus the pressure rise. Furthermore it is demonstrated, with an example of a short-circuit in a compact medium-voltage station with heavy metal evaporation, that the mathematical approach is a reliable tool to assess the development of pressure.
KW - Chemical reaction
KW - Electrical installation
KW - Energy balance
KW - Fault arc
KW - Hydro- and thermodynamics
KW - Melting and evaporation
KW - Pressure
KW - Relative purity
KW - Theoretical approach
KW - Thermal transfer coefficient
UR - http://www.scopus.com/inward/record.url?scp=33244481015&partnerID=8YFLogxK
U2 - 10.1109/TPWRD.2005.852274
DO - 10.1109/TPWRD.2005.852274
M3 - Article
AN - SCOPUS:33244481015
VL - 21
SP - 425
EP - 431
JO - IEEE Transactions on Power Delivery
JF - IEEE Transactions on Power Delivery
SN - 0885-8977
IS - 1
ER -