Tesis Doctoral: “Significance and measurement of dephase phenomena in three-phase sinusoidal and unbalanced power systems. Aplication to measurements in power systems with neutral wire”.

ABSTRACT
The doctoral thesis, whose title indicated above, is dedicated to study and measure of reagents phenomena in three-phase electrical systems. The thesis has been structured in 6 chapters and the bibliography. 
In chapter I, reactive power definitions are established by the main theories of electric power from the late 19th century to the present day have been critically analysed.
In chapter II, reactive phenomena, defined by the fundamental-frequency positive-sequence voltages and currents, such as the Unifying Theory and the IEEE Standard 1459-2000 establish, are analyzed using the expressions of the instantaneous reactive powers of sinusoidal three-phase power systems. Comparison between expressions of instantaneous reactive powers with balanced and unbalanced voltages allows define separately the reactive power due to reactive loads and reactive power due to imbalances. The existence of this last reactive power caused by unbalances is one of the contributions of the doctoral thesis, which cannot be established by classical theories.
In Chapter 3, reactive phenomena established in the previous chapter have been represented with three-phase connections of elements of circuit. These graphic representations help to understand better each of phenomena.
Chapter IV describes constitution and technical characteristics of the device and measuring system of reactive power, which discriminates between reactive power due to the reactive loads and reactive power caused by unbalances.
Chapter V is dedicated to describe experiences in industrial electrical installations, fundamentally, the lab testing and simulation results.
Chapter VI is dedicated to describe the findings and future achievements. The most outstanding results achieved were: theoretical and experimental verification of the existence of reactive power even in resistive systems caused by unbalances, exclusively, and obtaining magnitudes affecting the reactive power and that can be used to control or your compensation. 
First contribution has allowed to explain that reactive phenomena are not limited only to circuits with reactive loads, but they appear when there are shift-angles between voltages and currents, independent of which are the cause of these shift-angles. The second contribution is of great interest for the realization of control loops in the compensators of the reactive power caused by the unbalances. 
The bibliography provides 186 references that have been used for the development of the thesis.