Contents
The paper provides results of calculations of electric field for parallelepiped and ellipsoidal tanks. The calculations reported in the paper indicate that even at a relatively small volumetric density of charge (q=100 μC/m3) the intensity of the electric field in the vapour/air mixture may exceed the critical value (3 MV/m), which may cause a spark discharge. They also show the maximum of the electric field intensity, the maximum potential and energy after the change in shape of the tank, while the volume of the stored liquid remains the same. The calculations of these quantities can be used as a basis for reduction or elimination of the electrostatic ignition hazard.
Übersicht
Der Beitrag behandelt elektrische Felder in Behältern von der Form eines Parallelepipeds und eines Ellipsoids. Die Berechnungen zeigen, daß selbst bei relativ kleinen Werten der Raumladung (100 μC/m3) die elektrische Feldstärke im Dampf-Luftgemisch den kritischen Wert (3 ÖMV/m) überschreiten und einen Durchschlag verursachen kann. Außerdem werden die Maxima der elektrischen Feldstärke, des Potentials und der Energie in Abhängigkeit der Behälterform angegeben unter der Voraussetzung, daß das Volumen der enthaltenen Flüssigkeit konstant bleibt. Die Rechenergebnisse lassen sich als Basis für die Verminderung oder Elimination der Gefahr von Überschlägen verwenden.
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Abbreviations
- A, B, C :
-
factors of the ellipsoidal tank
- a, b, H :
-
length, width and height of the parallelepiped tank, respectively [m]
- E :
-
electrical field strength [V/m]
- h :
-
liquid height in the tank [m]
- q :
-
volumetric charge density [C/m3]
- R :
-
radius of the sphere [m]
- V :
-
electric potential [V]
- W E :
-
electric field energy [J]
- V :
-
volume of the tank
- ε r :
-
relative dielectric constant
- ε O :
-
absolute dielectric constant 8.854×10−12 [As/Vm]
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Kędzia, J., Ŀukaniszyn, M. Influence of the tank shape on the electrostatic field generated by space charge. Archiv f. Elektrotechnik 75, 383–386 (1992). https://doi.org/10.1007/BF01576108
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DOI: https://doi.org/10.1007/BF01576108