Development of Electromagnetic Environment of Three Phase Power Lines for Bio-Effects Evaluation

2012 ◽  
Author(s):  
Duyan Geng ◽  
Cuihuan Li ◽  
Guizhi Xu ◽  
Zhigang Zhao ◽  
Youhua Wang ◽  
...  
Keyword(s):  
Power Lines ◽  
Electromagnetic Environment ◽  
Three Phase

Evaluation of Influence to Electromagnetic Environment on Outside of Building by PLC System using Three-wire Three-phase Power Line

2020 ◽  
Vol 140 (12) ◽  
pp. 557-564
Author(s):  
Toshiyuki Wakisaka ◽  
Tohlu Matsushima ◽  
Hisao Koga ◽  
Hiroyuki Okumura ◽  
Nobuo Kuwabara ◽  
...  
Keyword(s):  
Power Line ◽  
Electromagnetic Environment ◽  
Three Phase

Power Flow Calculation Realization in Software for Grids with Four-Phase Power Lines

2014 ◽  
Vol 698 ◽  
pp. 694-698 ◽  
Author(s):  
Dmitry I. Bliznyuk ◽  
Pavel Y. Bannykh ◽  
Alexandra I. Khalyasmaa
Keyword(s):  
Steady State ◽  
Power Flow ◽  
Calculation Model ◽  
Power Lines ◽  
Power Flow Calculation ◽  
Steady State Analysis ◽  
Flow Calculation ◽  
Analysis Methods ◽  
Electrical Grids ◽  
Three Phase

The paper is devoted to the problem of power flow calculation and steady state analysis methods adaptation for four-phase electrical grids. These methods are based on developed models of four-phase power lines and phase convering transformers. The basis of research is nodal voltages equations for three-phase, four-phase and mixed (combined by three-and four-phase elements) grids. Algorithm of four-phfase elements parameters automized adaptation for power flow calculation model of "RastrWin" software have been developed.

A Simple Inverter-Motor System to Improve Energy Consumption and Maximum Torque

2012 ◽  
Author(s):  
Tohru Watanabe ◽  
Yukishige Fujita ◽  
Mikio Totani
Keyword(s):  
Energy Consumption ◽  
High Speed ◽  
Motor System ◽  
Power Lines ◽  
Maximum Torque ◽  
Coil Current ◽  
Ac Motor ◽  
Three Phase ◽  
Constant Strength ◽  
Precise Constant

A new inverter-AC motor system having four power source lines, which can control each coil current independently, is compared to an ordinary inverter-AC motor system using a Y-type coil connection and three power lines. In this paper, three-phase rectangular-type currents are generated by the inverter made of simple ICs. In a previous paper[1], similar comparison experiments were executed using a high-speed DSP board. The board can calculate the three-phase currents to generate a rotating, resultant, magnetic flux with a precise constant strength and phase. It was verified by experiments that an energy consumption of 15% can be saved by using the proposed independent, motor-coil currents. However, it requires high speed and high cost DSP or CPU. In this paper, it is verified by using a new inverter-AC motor system that an energy consumption of 15% can be saved, and also the maximum torque increases 10%.

scholarly journals Identification power line sections with increased electricity losses using sensors with Wi-Fi technology for data transmission

2020 ◽  
Vol 178 ◽  
pp. 01053
Author(s):  
A.V. Vinogradov ◽  
A.V. Bukreev ◽  
V.E. Bolshev ◽  
A.V. Vinogradova ◽  
M.O. Ward ◽  
...  
Keyword(s):  
Transmission Line ◽  
Data Transmission ◽  
Single Phase ◽  
Power Transmission ◽  
Power Line ◽  
Measured Data ◽  
Power Lines ◽  
Power Transmission Line ◽  
Central Unit ◽  
Three Phase

The article presents portable timers-electricity meters (PTEM) which are devices for examining 0.4 kV power lines. There are two developed several versions of the devices: single-phase PTEM used to examine single-phase branch lines to consumers, and three-phase PTEM used for any power line sections. Also, the method to identify sections of power lines with increased electricity losses by means of these devices is presented. The paper considers the application of the three-phase PTEM with Wi-Fi technology to transmit data. Up to six independent three-phase PTEMs with Wi-Fi technology can be installed at different points of the power transmission line and transmit measured data in real time to the central unit. The use of these devices allows determining both technological and commercial losses of electricity in different power line sections and draw conclusions about whether these losses are overestimated. On the basis of this, measures are taken to reduce losses.

scholarly journals Self-oscillations at the frequency of subharmonics in nonlinear electric chains and systems

2019 ◽  
Vol 139 ◽  
pp. 01054 ◽  
Author(s):  
M.I. Ibadullaev ◽  
A.N. Tovbaev ◽  
A.Zh. Esenbekov
Keyword(s):  
Single Phase ◽  
Experimental Studies ◽  
Power Lines ◽  
Equivalent Model ◽  
Critical Parameters ◽  
Steady State Mode ◽  
Power Sources ◽  
Electric Circuits ◽  
Three Phase ◽  
Extensive Class

It is known that the occurrence and existence of autoparametric oscillations (AIC) at the subharmonic frequency (GHC) in power lines (power lines) and in power supply systems is extremely undesirable, since they cause ferroresonant overvoltages at different frequencies. At the same time, there is an extensive class of nonlinear electric circuits in which the excitation of the AIC at the frequency of the SGC forms the basis of frequency-converting devices serving as secondary power sources. It is shown that single-phase-three-phase nonlinear systems are, to one degree or another, equivalent circuits of power lines, the main elements of which are: longitudinal compensation capacitors, transverse compensation reactors, and transformers with non-linear characteristics. The regularities of the excitation of the GCC at the frequency (ω / 3) of the power lines were studied, theoretical and experimental studies of the equivalent model of single-phase-three-phase circuits with nonlinear inductance were carried out. For a theoretical analysis of the steady-state mode of SGK at a frequency (ω / 3) with inductive coupling, the frequency- energy approach is used. The conditions of existence and critical parameters of the circuit are determined, and the mechanism of the appearance of the SGC at the frequency (ω / 3) is also studied.

Green Design and Manufacturing of Premium Efficiency Motor

2013 ◽  
Vol 456 ◽  
pp. 268-273
Author(s):  
Lie Zhun Wang ◽  
Zi Qing Liu
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Structure Design ◽  
Integrated System ◽  
Heat Radiation ◽  
Test Results ◽  
Electromagnetic Environment ◽  
Asynchronous Motors ◽  
Three Phase ◽  
Element Method

YE3 series of premium efficiency three-phase asynchronous motors adopt computer integrated system and anticipate the best optimized electrical design. In the structure design, airflow validity is analyzed by finite-element method (FEM) and the motors fan is designed optimally through experimental results; on the fan housing, the Ansoft finite-element method is used in analyzing the electromagnetic field , and designing optimally electromagnetic environment with the test results; the finite-element method is also used in analyzing the temperature field, connecting with the test results to optimize the ventilation structure. The radiating rib is metrical distribution and arrangement along the diameter of axle direction on the motor housing, following the principle of heat radiation and the principle of fluid mechanics, which can improve the ventilation and cooling effect. The design of the motor has reached the international advanced level.

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