PROVIDING RIGHT PHASE ORDER BASED ON MICROCONTROLLER AND AUTOCORRECTION OF WRONG PHASE ORDER

摘要

entrIn this study, the measurements of the accuracy of phase sequence and automatic correction of it have been performed using a microcontroller during the parallel connection of the generators. The voltage signals(R-R, S-S) of two mutual phases of the generator and the network have been converted to a proper level by a designed measurement circuit and then converted to square waves with applying these to the zero crossing circuit. The signals have been evaluated by a program written in C programming language which is inserted into the PIC16F877 Microcontroller. The phase lines are corrected by switching on relay A when the angle difference between the signals is 1200 electrical, or by switching on relay B when the angle difference between the signals is 00 electrical. Using A or B contactors which are controlled by A and B relays, the accuracy of phase lines of the system is provided. Here, the places of the phase connections of A contactor are changed on B contactor. The microcontroller takes A or B relay into the circuit with respect to the measurement it made. The experiment results have demonstrated the accuracy and applicability of the system.Bu ?aly?mada generat?rlerin paralel ba?lanmasy esnasynda, faz syralarynyn do?rulu?unun ?l?ülmesi ve otomatik olarak düzeltilmesi mikrodenetleyici tabanly olarak ger?ekle?tirilmi?tir. Ger?ekle?tirilen ?aly?mada ?ebeke ve generat?rün kar?ylykly iki fazyna ait (R-R, S-S)gerilim sinyalleri, tasarlanan bir ?l?me devresi tarafyndan uygun düzeye d?nü?türüldükten sonra syfyr ge?i? algylama devresine uygulanarak kare dalgaya d?nü?türülmektedir. Kare dalgaya d?nü?türülen bu sinyaller, PIC16F877 mikrodenetleyicisi i?erisinde C programlama dilinde yazylmy? olan program tarafyndan de?erlendirilmi?tir. Sinyaller arasyndaki a?y farky 1200 ise A rolesi, a?y farky 00 ise B r?lesi devreye alynarak faz syralary düzeltilmektedir. A ve B r?lelerinin kontrol ettikleri A veya B kontakt?rü üzerinden sistemin faz syralarynyn do?rulu?u sa?lanmaktadyr. Burada fazlaryn A kontakt?ründeki ba?lantysy B kontakt?ründe fazlaryn ikisinin yeri de?i?tirilerek ba?lanmy?tyr. Mikrodenetleyici yapty?y ?l?üme g?re devreye A veya B r?lesini almaktadyr. Deneysel sonu?lar ger?ekle?tirilen sistemin do?rulu?unu ve uygulanabilirli?ini g?stermi?tir