| Abstract |
There has been control electronics for a microcomputer-aided electric furnace of 700 kilowatts developed and put into practice recently by the Department above. Electric resistors are distributed into three symmetric heating zones and thyristors, switching elements, sensing devices, instrumentation are incorporated in two phases only due to the new thyristor control strategy. (a) Thyristor control ensures 3-phase power-input for symmetric high-powered furnace without harmonics, (b) it provides transient state-less operation, (c) tempersture control can be specified by heat treatment technology concerned, (d) thyristors are controlled in 16 portions by cycle, thus average power-input can be adjusted to industrial requirements, (e) error coding and memory circuit provides monitoring thyristor fault and electric asymmetry as well. Thyristor control has new main circuit and new electronic circuits and devices, too. |
