Thyristor power controller are dearer, one will replace several contactors. Notably in giant boilers with several stages, there's a saving in producing time and price because the wiring is considerably reduced.
The most necessary advantage of thyristor management is their ability to step by step apply power to the weather within the boiler, nearly eliminating the matter of thermal shock, and lengthening the lifetime of the heating parts.
Without the physical contacts found in contactors, a thyristor controller does not wear out with the continual switch.
The Thyristor power controller is hooked up to a PLC (Programmable Logic Controller), forming a part of a pelvic inflammatory disease Loop (Proportional Integral Derivative). This is often a specialized feedback system that helps to anticipate the lag within the system, that the put on or off happens simply before it's required. This prevents thermal overshoot, wherever the weather area unit still provision heat when the set temperature has been reached and therefore the power converted, creating the boiler a lot of energy economical. This is often solely potential with thyristor management as a pelvic inflammatory disease Loop cannot be enforced on boiler mistreatment contactors.
· Reverse conducting Thyristor power controller
A reverse conducting thyristor power controller (RCT) has AN integrated reverse diode, therefore isn't capable of reverse obstruction. These devices square measure advantageous wherever a reverse or freewheel diode should be used. As a result of the SCR and diode ne'er conduct at constant time they are doing not turn out heat at the same time and might simply be integrated and cooled along. Reverse conducting thyristors square measure usually employed in frequency changers and inverters.
· Photo Thyristor power controller
Photo Thyristor power controller square measure activated by lightweight. The advantage of photo Thyristor power controller is their inability to electrical signals, which may cause faulty operation in electrically blatant environments. A lightweight triggered thyristor (LTT) has AN optically sensitive region in its gate, into that no particulate radiation (usually infrared) is coupled via AN glass fiber. Since no electronic boards got to be provided at the potential of the thyristor so as to trigger it, lightweight triggered thyristors are often a bonus in high voltage applications like HVDC. Lightweight triggered thyristors square measure obtainable with in-built over-voltage (VBO) protection that triggers the thyristor once the forward voltage across it becomes too high; they need conjointly been created with in-built forward recovery protection, however not commercially. Despite the simplification they'll bring round the natural philosophy of AN HVDC valve, lightweight triggered thyristors should need some easy watching natural philosophy and square measure solely obtainable from some makers.
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