Power processes quality estimation and compensation for poor quality in low-voltage electric networks

A method of power processes quality estimation and compensation for poor quality in industrial low-voltage electric networks is substantiated. Calculation relations for spectral presentation of power components and quality factors of electric power are improved in accordance with p-q-r-theory of instantaneous power. The structure of compensating device is grounded and a higher efficiency of nonlinear distortions compensation compared with the basic variant of p-q-r-theory is confirmed

Metoda racionalne izbire nekaterih elektromehanskih naprav

An approach to improvement of interconnections of a summarised geometric dimension and the power parameters of electric machines, transformers and electric devices is determined based on a generalisation of theoretical and experimental research results.Delo obravnava pristop iskanja povezav med elektromagnetnimi parametri in geometrijo različnih vrst električnih strojev ter ostalih električnih naprav. Na podlagi rezultatov teoretičnih in eksperimentalnih raziskav je oblikovan kriterij, ki omogoča racionalno izbiro družine električnih naprav za izbrane moči

Dynamic loads control in a pump complex with adjustable pipeline valves

An electromechanical system of dynamic loads reduction in pump complex pipeline network is developed on the basis of locking and regulating stopcock variable-frequency electric drive. It is proved that irregular rate of pipeline valves control is an efficient way of dynamic loads reduction. An adjustable valve pipeline network model taking into account wave processes in the pipeline and stopcock hydraulic resistance nonlinear dependence on the relative rate of its opening is offered

A Search for Technologies Implementing a High Fighting Efficiency of the Multilayered Elements of Military Equipment

Technologies for the production of multilayered spherical bottoms and cylindrical shells of quasi-layered material and compaction of the multilayered wall of military equipment elements are developed. The need for these studies is associated with increasing survivability and eliminating fragmentation effects of multilayered structures on manpower and equipment that use pressure vessels (submarines, flamethrower vessels, elements of armored vehicles).Operating conditions for the most efficient use of structures made of layered structural materials are presented. Their advantages in operation and production are described. The highest efficiency is achieved with firm adhesion of structural layers or with the use of quasi-layered materials. The solution to this problem is possible using the energy of high explosives. It is experimentally found that explosive loading leads to an increase in toughness and ballistic resistance of treated materials. Analysis of various methods of multilayered wall compaction is carried out and the most effective technologies are proposed.As a result of the research, process parameters, requirements for process equipment are established.The importance of the presented studies is associated with increasing the fighting efficiency, survivability of military equipment and personne

A Search for Technologies Implementing a High Fighting Efficiency of the Multilayered Elements of Military Equipment

Technologies for the production of multilayered spherical bottoms and cylindrical shells of quasi-layered material and compaction of the multilayered wall of military equipment elements are developed. The need for these studies is associated with increasing survivability and eliminating fragmentation effects of multilayered structures on manpower and equipment that use pressure vessels (submarines, flamethrower vessels, elements of armored vehicles).Operating conditions for the most efficient use of structures made of layered structural materials are presented. Their advantages in operation and production are described. The highest efficiency is achieved with firm adhesion of structural layers or with the use of quasi-layered materials. The solution to this problem is possible using the energy of high explosives. It is experimentally found that explosive loading leads to an increase in toughness and ballistic resistance of treated materials. Analysis of various methods of multilayered wall compaction is carried out and the most effective technologies are proposed.As a result of the research, process parameters, requirements for process equipment are established.The importance of the presented studies is associated with increasing the fighting efficiency, survivability of military equipment and personne

Refined Calculation of Induction Motor Equivalent Circuit Nonlinear Parameters by an Energy Method

The topicality of the research aim is caused by the analysis of the processes of energy conversion taking into account the induction motor particular nonlinearities that reveal the physical properties and phenomena in structural materials under the action of electrical and electromagnetic impacts. Taking into consideration the nonlinearities of the induction motor equivalent circuit influences the accuracy of determination of the electric machine operating characteristics. Most conventional methods for parameter identification do not enable assessment of the induction motor nonlinear characteristics and properties.It is proposed to use resistive impedance and inductance dependences on the rotor current to take into account the rotor nonlinear parameters. To form identification equations, the instantaneous power components for the rotor nonlinear resistive impedance and nonlinear inductance have been obtained. The solution of the identification equations resulted in determination of the equivalent circuit electromagnetic parameters taking into account the rotor nonlinear parameters and the amplitudes of the harmonics of the current cosine and sine components of the rotor and magnetization circuit. The results of identification of the induction motor equivalent circuit parameters taking into account the rotor nonlinear parameters have been obtained with sufficient accuracy. This is confirmed by a low error of determination of the electromagnetic parameters. The adequacy of the identified parameters is determined by comparison of the stator current experimental and calculated curve