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ELECTRICAL HEATING - PART - 10 - DIRECT AND INDIRECT AND SUBMERGED ARC FURNACES

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ELECTRICAL HEATING - PART - 10 DIRECT AND INDIRECT AND SUBMERGED ARC FURNACES Full notes is available in http://zenmurali.blogspot.in/ FURNACE - A furnace is a device used for high-temperature heating. The name derives from Greek word fornax, which means oven. ARC When a high voltage is applied across the air gap, the air in the gap gets ionized under the influence of electrostatic forces and becomes a conducting medium. Current flows in the form of a continuous spark, called the arc. Very high voltage is required to establish an arc across an air gap but to maintain an arc, small voltage may be sufficient. PRINCIPLE OF ARC FURNACE - An Arc can also be produced by short circuiting the two electrodes momentarily and then withdrawing them back. In this method of striking an arc, high voltage is not required. Arc drawn between two electrodes produces heat and has a temperature between 1000 degree centigrade and 1500 degree centigrade depending on the material of the electrod...
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