INDUSTRIAL ELECTRONICS AND CONTROL Including Programmable Logic Controller Third Edition, Biswanath Paul by PAUL BISWANATH

Author:PAUL, BISWANATH
Language: eng
Format: epub
Publisher: PHI Learning
Published: 2014-06-29T16:00:00+00:00

Fig. 5.52(a) Cut-way view and symbol of an ignitron.

The arc so created continues for the remaining part of the cycle during which the anode remains positive with respect to the cathode. When the anode becomes negative, the arc extinguishes and the tube deionises rapidly. Ignitrons are capable of carrying plate currents from 10 A to 5000 A. Available sizes of ignitrons can handle currents from 40 A to 10,000 A, per pair of tubes.

Potential distribution curve of the ignitron

Figure 5.52(b) shows the potential distribution in the arc of an ignitron. The three parts of the arc are (i) cathode sheath, (ii) plasma, and (iii) anode sheath. The positive ions surrounding the cathode form the cathode sheath. The electrons emitted from the cathode move to the plasma while the positive ions from the plasma move to the cathode. In the cathode sheath, the voltage drop is about 10 V. A voltage drop of nearly 4.5 V is required to liberate electrons while the remaining drop of 5.5 V accelerates the electrons to cause ionisation.

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