Simple microprocessor-based load angle measurement instrument

The design and implementation of a simple load angle measurement instrument built around a Z80 microprocessor is described. The task of the microprocessor is to measure the load angle of a synchronous generator which is equal to the phase angle between the internal excitation voltage and the generator output. The load angle is displayed on a on line screen. It is also converted to an analogue value and recorded by an on line plotter for transient analysis a feature that makes such an instrument suitable for either digital or analogue controllers. The tests carried out showed that the instrument has a very fast response. It is accurate, reliable and inexpensive. The resolution in the load angle measurements can be increased by a simple procedure.International Symposium on Intelligent Signal Processing and Communication System