scholarly journals Investigation of ferroresonanse phenomena and its possibilities of occurrence in the operation of 6-220 kV electromagnetic transformer

2021 ◽  
Vol 288 ◽  
pp. 01058
Author(s):  
Andrew Tychkin ◽  
Andrew Yablokov ◽  
Vladimir Lebedev ◽  
Nikita Rodin ◽  
Maksim Batmanov
Keyword(s):  
Mathematical Modeling ◽  
Influencing Factors ◽  
Experimental Studies ◽  
Experimental Setup ◽  
Voltage Transformer ◽  
Physical And Mathematical Modeling

Ferroresonance phenomena lead to damage to electromagnetic measuring voltage transformers and nearby equipment. Damping devices and antiresonance transformers, which are used for preventing the occurrence of ferroresonance phenomena, are effective in a certain area of influencing factors. The article presents methods for studying the possibility of occurrence of ferroresonance phenomena in the operation of 6-220 kV voltage transformers based on physical and mathematical modeling. The results of the tests according to the developed method are the area of the existence of a dangerous ferroresonance for the voltage transformer under test or the confirmation of its antiresonance properties in a certain range of influencing factors under study. The article also describes an experimental setup based on RTDS for conducting experimental studies. The developed methods were tested in the studies of one of the types of antiresonance transformers.

scholarly journals Physical and mathematical modeling of the moving the raw cotton between directing wall and area ginning seeds

2021 ◽  
Vol 2131 (3) ◽  
pp. 032056
Author(s):  
M Ahmedov ◽  
M Shoraxmedova ◽  
T Tuychiev ◽  
D Tashpulatov ◽  
I Cherunova
Keyword(s):  
Mathematical Modeling ◽  
Cotton Fiber ◽  
Quantitative Estimation ◽  
Experimental Studies ◽  
Raw Material ◽  
Direct Impact ◽  
Actual Problem ◽  
Working Chamber ◽  
Qualitative And Quantitative ◽  
Physical And Mathematical Modeling

Abstract In article are brought algorithm and results brought numerically-experimental studies on qualitative and quantitative estimation of the law of the moving the raw cotton from directing walls outgoing between spiked-drum and netlike surface feeder aside worker of the camera ginning machines. It is known that the uniform supply of raw cotton to the ginning process has a direct impact on the efficiency of the ginning process. In the process of ginning, the cotton is cleaned on the surface of the pile drum and net of the supplier, and the crushed gin comes to the working chamber through the gin. As a result of the rotation of the saw cylinder in the working chamber, the cotton fiber is suspended and the rotation is started. As a result of the circular motion of the raw cotton, a raw material roller is formed. In this process, the actual problem is to ensure that the raw cotton consists of small pieces and is uniform in time and width of the equipment. The Comparison got given on calculation shows that increase the corner will bring about increase the growing forming displacement. Increase of this corner will bring the leaflet of the raw cotton about increase of length free moving.

The Engineering Characteristics of Snow Skis—Part 1: Static Bending and Torsional Characteristics

1975 ◽  
Vol 97 (1) ◽  
pp. 131-137 ◽  
Author(s):  
A. Deak ◽  
J. Jorgensen ◽  
J. Vagners
Keyword(s):  
Experimental Studies ◽  
Beam Theory ◽  
Experimental Techniques ◽  
Experimental Setup ◽  
New Materials ◽  
Engineering Characteristics ◽  
Analytical Results ◽  
Geometric Arrangements

This paper presents the results of analytical and experimental studies of static bending and torsional characteristics of snow skis. The purpose of the work is to develop analytical and experimental techniques that would be useful to the ski designer who must continually explore the applicability of new materials and geometric arrangements to snow ski construction. A brief review of composite shallow beam theory is presented in a form directly applicable to ski analysis. The experimental setup to verify the analytical results is described.

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