Abstract: Energy coefficients and energy efficiency criteria for heat and mass transfer devices are considered. With application of these coefficients and criteria, modified complexes for the energy separation efficiency of packed-type gas separators aimed to remove liquid aerosols are obtained. Technical characteristics of structured and random packings are given and calculations of energy complexes and of the power required for supplying gas to the purification are made. It is determined that the spiral-prismatic packing is most efficient among all considered random packings and the spiral wound packing RGN-5 (manufactured by LLC EPC “Inzhekhim”) is most efficient among all considered structured packings.

Abstract: The article presents an algorithm for estimating reliability parameters - probability of failure-free operation time and failure rate of low-voltage switching devices based on statistical data on failures of circuit breakers installed in control and protection circuits of such consumers as compressors, pumps and fans in industrial enterprises. The theoretical and statistical functions of the probability of the failure-free operation time of automatic circuit breakers depending on the service life and the number of operation cycles have been investigated and a hypothesis has been put forward and confirmed on the normal distribution law of the random variable (probability of failure-free operation o automatic circuit breakers) using the "agreement criteria" - the Kolmogorov test and Pearson's criterion.

Abstract: The work is devoted to the consideration of the bus bar ring damping of turbogenerator stators. The urgency of the problem of ensuring the vibrational reliability of high-power turbogenerator stators is shown. On the model problem, a series of computational studies on the effect of damping properties of materials on the amplitude-frequency characteristics of the stator buses of turbogenerators was carried out. Based on the results of the computational studies, a bus bar design is proposed, comprising a layer of a vibration-absorbing material. The use of a vibration-absorbing polymeric material in bus bar ring can reduce the amplitude of oscillations up to two times and, accordingly, significantly improve the vibration reliability of the stator elements of the turbogenerator. The results of the research are protected by a patent.

Abstract: Technical and organizational problems, connected with functioning normalization for heat expansion systems (HES) of steam turbines are considered. The approved technical decisions for a range of reasons of bearing cases moving difficulties are noticed. It is presented, that the complex approach for solutions of HES stable operating and exposure resistance is necessary at the new turbines design.

Abstract: An integrated solar combined cycle (ISCC) composed of a triple-pressure natural gas combined cycle and parabolic trough collector solar field is investigated in this paper. The purpose is to study and evaluate the performance of the cycle when the solar heat injected into the heat recovery steam generator of the steam cycle. Thus, a thermodynamic model of the proposed ISCC plant has been developed in Mathcad environment to simulate and analyze the cycle performance ate different seasons of the year. It has been found that the solar energy can generate steam that can be used to increase the power output of the steam cycle from 182 MWe to 237 MWe with an increase of 30% from reverence value. This can achieve an annual reduction in CO2 emission of 75000 tons/year.

Abstract: The coordinated generation and load control to increase transient stability level of oil- production enterprise autonomous power system with dominant motor load is studied in the paper. Mutual angle between voltage phasors at gas turbine plant bus and equivalent load node as well as slip difference of synchronous machines are used as input signals. It is shown that implementation of additional control allows to increase the level of transient stability by more than 40%. The combined coordination of power system stabilizer of synchronous generators and motors as well as gas turbine frequency control parameters is applied. The positive impact of power system stabilizer settings on post-accident conditions is proved by analysis of small signal stability.

Abstract. A method is proposed for calculating the initial value of the periodic term of the short- circuit strength of a dual-circuit overhead transmission line using multiphase replacement circuits. The method takes into account the electromagnetic connections between the wires of the dual-circuit overhead line and the ground to transient modes. The calculation model will allow to take into account the influence of the internal properties of the dual-circuit overhead line when calculating the three-phase short-circuit currents at the design stage, which will significantly improve the accuracy of the choice of relay protection settings and line automation. The model was tested in Matlab Simulink.

Abstract: Paper provides comparative analysis of basic regulations governing design of systems of cathodic protection of underground metal structures against corrosion based on both Russian and international materials. The following basic parameters for evaluation of cathodic protection system performance are accepted: "need for applying cathodic protection systems", "values characterizing security of underground metal structures against corrosion in the presence of electrochemical protection", "density of protective current" and "magnitude of protective current". Carried out analysis identified the need to improve Russian system of cathodic protection systems design for all listed characteristics and above all in the direction of reducing the quantities of protective current and its density.

Abstract: In this paper, we offer a simple, intuitive, qualitative method for analyzing in diagnosing transformer oils, which does not require expensive equipment and at the initial stage allows us to determine the degree of oil aging.

Abstract: The present paper presents a comparison of the performance of different flow conditioners. The numerical investigation is carried out using ANSYS FlUENT. Flow conditioners efficiency is evaluated on the basis of the ability of these devices to produce a uniform velocity profiles with low pressure loss under high-level disturbance conditions, such as those produced by gate and ball valves. A new flow conditioner device, which consists of two perforated conic plates has been designed, and demonstrated a high performance within a short distance downstream of the flow conditioner.

Abstract: The original design of a light device with an led source of optical radiation, the light- emitting element of which is made in the form of a half-ellipsoid, is presented, which allows to minimize passive losses of crystal radiation and increase the efficiency of the radiator. The lamp can be used as a point light source in optical and electronic equipment, as a lighting device, night lamp and other types of lighting devices.

Abstract: Research of operation electrical machines in transitional mode is an actual task. Modeling dynamic processes with changing load parameters and probabilistic assessment of simulation results allows taking into account the degree of influence of these changes on transient response. An approach to the study of the dynamics of an asynchronous electrical motor under external and parametric perturbations shown. Recommendations was given on the use of this method in solving the problem of identifying the parameters of electric machines.

Abstract: This article presents the results of a research concerning evaluation of the nature and influence degree of electricity consumers on the form of the autonomous power supply systems voltage, using the example of the BES-3000RM gasoline generator. Oscillograms of the work of a gasoline generator with active, inductive and parametric loads are presented, and for each of the experiments carried out, the main electrical parameters of the system inclusive gasoline generator and load were calculated and measured. The internal inductance and the active resistance of the BES-3000RM gasoline generator were calculated. The main negative influences for the sensitive load supplying process due presence of gasoline generator internal inductance and active resistance were indicated.

Annotation: There are various types of electrical equipment used in the extraction of oil at the Rumaila field, with an average voltage of 11 kV and a low voltage of 0.4 kV. The most common elements in this class are transformers and reactors, engines and gas discharge lamps. All of this equipment consumes reactive power and reduces the value of the power factor. (Power factor is the ratio of kW to kVA). The closer the power factor to the maximum possible value of 1, the greater the benefit for the consumer and supplier. In case of low power factor, the current will be increased, and this high current will lead to (large line losses, an increase in the nominal total power of kVA and overhaul dimensions of electrical equipment, deterioration in voltage regulation process and an increase in voltage drop, a decrease in efficiency).
Power factor improvement allows the use of smaller transformers, switchgear and cables, etc. as well as reducing power losses and voltage drop in an installation. Improving the power factor of an installation requires a bank of capacitors which acts as a source of reactive energy. These arrangements provide reactive energy compensation. In Rumila, An improvement of the power factor of an installation presents several technical and economic advantages, notably in the reduction of electricity bills, we save (685.854.007 Iraqi Dinar= 550.000 $) for one month . All this work takes 6 to 12 month.

Abstract: This paper proposes a mathematical model and a measuring algorithm for a semiconductor one-dimensional distributed sensor designed to measure temperature fields in non- isothermal liquid and gas flows. A sensor device, its equivalent circuit and a circuit for connection to a measuring circuit are described. A step-by-step measurement algorithm is proposed, which includes the necessary electrical measuring operations and an algorithm for mathematical processing of the primary measurement information in order to determine the measured temperature field.