Automatic Thyristorised Control of any Electrical Load (Electric Furnace) from a Remote Area using an Optical Fiber Cable

摘要

The Project is planned and executed as a base of yet to emerge 'Network Control System' (NCS) and well emerging Optical Fiber technology. The NCS is under excavation of the drawbacks of the present master 'Distributed Control System' (DCS) and NCS has gained its momentum to drop a full stop to DCS. This system controls and maintains the temperature of the electric heater, by controlling the gate pulse of the two anti parallel thyristors, given by an UJT pulse-triggering unit, controlled through an optical fiber cable. The UJT triggering provides pulses of relatively high amplitude and is not affected by loading. To maintain the temperature of the heater, a feed back circuit consisting of a thermistor, a voltage amplifier, comparator and a control unit are employed. Optical fiber provides greater isolation between power and control circuitry. OFC are not affected by electromagnetic interference. This concept of controlling can be utilized for any kind of electrical load.