METHOD OF ARC DISCHARGE CREATION IN PLASMATRON Russian patent published in 2009 - IPC H05B7/18 

FIELD: electrics.

SUBSTANCE: invention concerns electric equipment and is intended for arc discharge creation in plasmatron. Method of arc discharge creation in plasmatron involves distributed supply of work body (gas) along the length of separate tubular inserts (neutrodes) with axial and tangential speed component and specified flow rates, excitation of auxiliary discharge, and work arc ignition. According to the method, idling voltage (U_i) of electric power source is specified, optimum quantity of neutrodes depending on idling voltage is set, length of first neutrode upstream of the gas flow within laminar arc section length is defined, and threshold value of idling voltage to neutrode radius is calculated. Each next neutrode length is 1.3-2.2 times shorter than previous one. At U_i up to 600 V threshold value is (70-80)·10^-3 V/m, at U_i up to 1500 V - (100-115)·10^-3 V/m, at U_i up to 5000 V - (200-220)·10^-3 V/m. Neutrode radius for specified idling voltage is defined by obtained threshold values. After launching operational supply of gas and arc current plasmatron is launched. At idling voltage up to 600 V it is reasonable to form plasmatron with one neutrode, at up to 1500 V - with two neutrodes, at up to 5000 V - with four neutrodes.

EFFECT: improved thermal parametres of plasma jet and energy properties of plasmatron, enhanced stability of arc burning, reliable and cost-effective operation of plasmatron in industrial aggregate.

2 cl