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2 Jakość i Użytkowanie Energii Elektrycznej

2 2001

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Dynamic states of the electric arc in controlled current supply systems of electrothermal direct current devices. Part 2, General stability conditions of electric arc dynamic systems

Krouchinin A., Sawicki A.

Jakość i Użytkowanie Energii Elektrycznej

2001

T. 7, z. 2

71-77

A new interpretation of Kaufmann criterion has Been described in the paper. The criterion concerns a stability of electrical D.C. arc in the simple electrical circuit with an additional resistance. A chemical composition of plasmagenic gas and three methods of dissipation of energy arc in the form of conduction, radiation and the convection head are considered in the paper. In the case of a rectifier thyrystor system supply of arc, the transfer function of linearized system is described. The criterion of minimal inductance choke needed for stabilization of are in the electrical circuit is shown.

Dynamic states of the electric arc in controlled current supply systems of electrothermal direct current devices. Part 1, Transmittance of the elecfric arc

Krouchinin A., Sawicki A.

Jakość i Użytkowanie Energii Elektrycznej

2001

T. 7, z. 2

63-70

In this article a solution is given of differential equation representing the energy of the cylindrical part of an unstationary arc. Universal functions of conductance, radiation and enthalpy are introduced on the basis of the physical model of two-layer arc. Similarity conditions of arcs in gas of the same chemical composition are specified. The influence of the conical part and of external disturbances on the model of dynamie arc is analysed. The transmittance of the arc has Been obtained by local linearization of its characteristics. The relations holding between the arc transmittance parameters (time constant and coefficients) and the parameters of plasmagenic gas and of heat exchange coefficients are also given