Abstract
Within the research activities, the realization team did the complete development of the annealing unit with the aid of modern technology and components, such as the programmable logic controller, industrial PC, and microcontrollers, to secure an intelligent way of switching the power semiconductor switches (SSR relays) with regard to minimizing the low frequency conducted disturbances. The annealing unit has the implemented algorithm for two ways of output power control, i.e. phase control and full wave control. The algorithm of the full wave control is designed in a way so as to arrange the balanced power in the load. By using this way of control, the harmonic emission is almost entirely eliminated, but the influence of the flicker effect will surface. The article offers a complex view at the annealing unit from the control method perspective, ensuring the correct annealing cycle and subsequent influence of the annealing unit to supply network. It deals deeply with EMC analysis for both ways of designed annealing unit control. The analysis comes out from the experimental measurements on the functional annealing unit prototype.DOI: http://dx.doi.org/10.5755/j01.eie.23.5.19239
Highlights
Due to the fact that annealing process is not a common issue, there is a limited amount of manufacturers involved in the development and production of the annealing units
This paper has been supported by the following projects: LO1404: Sustainable development of ENET Centre; CZ.1.05/2.1.00/19.0389 Development of the ENET centre research infrastructure; SP2017/159 and SP2017/97 Students Grant Competition and TACR TH01020426
On condition that the measured instantaneous current value is lower than 65 A for the second and third testing impulse, the full-wave control is selected (Fig. 2)
Summary
Due to the fact that annealing process is not a common issue, there is a limited amount of manufacturers involved in the development and production of the annealing units. The development of the smart annealing unit was focused on the mitigation of disturbance to the supply system, but mainly for the precise and flawless run of the annealing cycle. For this reason, it was necessary to add many diagnostic sensors and algorithms, to provide some intelligence. The output heating sections of the annealing unit are short-circuit proof, and are able to disconnect the fault within 10 ms. It is capable of detecting a disconnected heating element, thermoelement, communication error and other failures. The assessment for different control modes has been made
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