Engineering Sciences

Yazarlar: Ilhan GARIP

Konular:-

DOI:10.12739/nwsaes.v5i2.5000067087

Anahtar Kelimeler:Equality of phase orders,Parallel connection,Equality of phase angle,Microcontroller,Zero pass switching circuit

Özet: In 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.

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