Surzhik T.V. (Kiev) Quasi-potentials method for computation problems of temperature state of non-homogeneous media which are heated by stationary electric current

A theory of quasi-potentials for reduction of equations of stationary heat conduction with inner sources of heat release, which density is determined by stationary electric currents in conducting media, to an equation of Laplace one is developed.

Boiko N.I., Bondina N.N., Levchenko E.V., Mikhailov V.M. (Khar'kov) Flow application for analysis of fields influence on polarized bodies

Problems of a resulting electric field computation formed by a homogeneous external field influence on multilayer spherical and cylindrical shells as to a flow are formulated and solved. Pictures of power lines of an electric field which influences on a spherical model of a biological cell are obtained.

Volkov I.V., Kondratenko I.P., Raschepkin A.P. (Kiev) Magnetohydrodynamic processes in continuous-casting moulds with mixers of double frequency supply

Conditions of an azimuthal motion of different direction of melt layers in a mould under an operation of high- and low frequency components of antitravelling magnetic fields are determined.

Fal'kovsky N.I., Belinsky V.V. (Kiev) Power distribution in a channel of weak current high-voltage discharge

Power distribution in different zones of weak current (1<197>100 mA) pulsating channel is investigated. Potentials distribution in a channel is obtained from power distribution. Levels of near electrode voltage drops values correspond to glow dischages values and fields levels in a column correspond to computative values both of a glow and high-voltage arc dischages. A physical dischage mode can be changed by a channel length and current change as to applied problems of its application.

Aristov Yu.V., Bozhko I.V. (Kiev) About an inverse corona effect and possibilities of its practical application

Conditions of inverse corona origin and its characteristics in a plane parallel gap with electrodes which are covered with a thin dielectric layer are investigated. There is a conclusion about possibilities of practical application of this effect in plasma reactors and other purposes.

Ignatjev I.G. (Sumy) Electrodynamic stability of coaxial cylinders

Influence of own electrostatic field on coaxial cylinders system stability is considered. Expression for a critical potential which causes equilibrium loss according to capstan equation is obtained.

Zhemerov G.G., Krylov D.S. (Khar'kov) Harmonics in a network current of a compensative controllable rectifier

Computative formulae for a network current harmonics determination of a compensative controllable rectifier at thyristor currents linear commutation in a full compensation mode of a reactive power are obtained. Distortion and non-sinusoidality coefficients dependences of network currents of a compensative controllable rectifier on a control angle are given.

Koroteev I.E. (Zelena Gura, Poland), Zhuikov V.Ya., Petergerja Yu.S. (Kiev) Conditions of chaotic modes existence in electric circuits with key elements

Conditions of strange attractors existence in electric circuits with key elements which are described by linear differential equations on continuity intervals are considered.

Degtev V.G., Lavruk I.S. (Odessa) Directed windings synthesis in a prescribed number of slots

The basis of the proposed method is representation of electric motors windings in the form of structural models of the same dimensions. Application of symmetrical and partly asymmetrical modules permits to search efficiently a restricted number of basic versions of windings with the prescribed level of selection at each number of poles. Increase of basic subsets of digital models is fulfilled by means of operation conversions device application coupled with an invariance property.

Zharkin A.F. (Kiev) Sinusoidality distortion of currents and voltages curves in low voltage networks at different utilization values of a supplying transformer

Analysis of utilization coefficient value influence of a supplying transformer on high harmonics value of currents and voltages of low voltage distributive network with non-linear load is made.

Vas'ko P.F. (Kiev) Computation of technical efficiency indices of wind-electric plants application by the results of the hour measurements of wind velocity

Computation algorithm of technical efficiency indices of wind-electric plants application at small extents of by the hour measurements results of wind velocity is elaborated. Distributions matching of recurrence periods of wind velocities over gradations and directions at measurements height with characteristic of a wind plant power is fulfilled by introduction of additional computative gradations. Examples of algorithm application for practical computations conduction are given.

Ljuty A.P. (Zaporozhje) Electromagnetic compatibility estimation at random voltages asymmetry in power networks

Problem of permissibility estimation of voltages asymmetry which accidentally changes is considered. Electric equipment sluggishness is considered as to asymmetry influence. Probability distribution of electric equipment overheating temperatures is founded. Heat wear estimation from random asymmetry is made.

Kanivets I.A., Kononenko A.G., Masjurenko Yu.A., Nizhensky A.D., Latenko V.I., Ornatsky I.A. (Kiev) High-accurate pulse laser ranger

A functional circuit of a high-accurate pulse laser ranger, which implemented structural and algorithmic methods of errors correction of time intervals measurement, is considered.

Monastyrsky Z.Ya. (Kiev) Simplified extrapolated balancing of digital extreme AC bridges

A methodical error of extrapolating balancing caused by linear approximation of unbalance signal amplitude dependence on a controlled parameter in extreme bridges with symmetrical and asymmetrical multistep modulation is investigated. It is shown that a symmetrical multistep modulation permits to implement a simplified extrapolating balancing at three younger decades.

Grinevich F.B., Meleschuk D.V. (Kiev) Special features and metrological characteristics of platinum thermal converters of resistance

A problem of high current temperature measurement is considered. Analysis of temperature measurement error by means of platinum thermal converter of resistance caused by operating current flow through a sensing element is made.

Burbelo M.I. (Vinnitsa) Parameters differentiation of spectral supports and compensative-bridge circuits for their measurement

The article proposes to expand a circle of spectral passive parameters which characterize processes in electric circuits at periodical nonsinusoidal currents effect by consideration of parameters which provide a correspondence of frequency and spectral characteristics of linear electric two-terminal networks. This will permit to provide elements parameters determination of electric circuits in conditions of nonsinusoidality using integral parameters of periodical nonsinusoidal currents and voltages for it. Block diagrams of extreme and quasi-balance compensative bridge circuits for spectral parameters measurement are given.

Shumkov Yu.S. (Kiev) Estimation of dynamic characteristics determination error of linear analogue devices

Analysis of determination error of dynamic characteristics of linear analogue devices by a direct method is made. Error is caused by nonideality of a staged test signal shape (TS). TS shape distortion models which take into consideration a final duration of front, output and oscillations at pulses peak, typical for ns-time range, are considered. A method of the specified error minimization on the basis of TS real model consideration is investigated. Estimation of TS errors model is made on the basis of "dot" parameters, which characterize a signal shape, and can be easily estimated by experiment.