Electrodeless breakdown in elliptically polarized fields at 60 Hz

1983 ◽  
Vol 61 (9) ◽  
pp. 1284-1290
Author(s):  
D. E. Friedmann ◽  
F. L. Curzon ◽  
M. Feeley
Keyword(s):  
Field Strength ◽  
Linear Polarization ◽  
Breakdown Strength ◽  
Breakdown Threshold ◽  
Glass Bulb ◽  
Maximum Field Strength ◽  
High Fields ◽  
Strength Formula ◽  
Elliptically Polarized ◽  
Maximum Field

Theoretical and experimental results are presented on the frequency of electrodeless breakdown (fB) of a gas in a spherical glass bulb immersed in an elliptically polarized field of maximum field strength [Formula: see text] and frequency fA (~60 Hz). It is found that the breakdown threshold is independent of the ellipticity and that graphs fB versus [Formula: see text] are stepped at low fields and linear at high ones. At high fields, fB = fAl/e0 where l is the circumference of the phasor and e0 is the breakdown strength of the gas ([Formula: see text] and [Formula: see text] respectively for circular and linear polarization). The implications of the results for measuring environmental fields are given.

scholarly journals Small Scale Solar Magnetic Fields: Theory

1977 ◽  
Vol 4 (2) ◽  
pp. 241-250 ◽  
Author(s):  
N. O. Weiss
Keyword(s):  
Magnetic Fields ◽  
Field Strength ◽  
Solar Physics ◽  
Small Scale ◽  
The Sun ◽  
Solar Magnetic Fields ◽  
Solar Granulation ◽  
The Past ◽  
Maximum Field Strength ◽  
Maximum Field

One of the most exciting developments in solar physics over the past eight years has been the success of ground based observers in resolving features with a scale smaller than the solar granulation. In particular, they have demonstrated the existence of intense magnetic fields, with strengths of up to about 1600G. Harvey (1976) has just given an excellent summary of these results.In solar physics, theory generally follows observations. Inter-granular magnetic fields had indeed been expected but their magnitude came as a surprise. Some problems have been discussed in previous reviews (Schmidt, 1968, 1974; Weiss, 1969; Parker, 1976d; Stenflo, 1976) and the new observations have stimulated a flurry of theoretical papers. This review will be limited to the principal problems raised by these filamentary magnetic fields. I shall discuss the interaction of magnetic fields with convection in the sun and attempt to answer such questions as: what is the nature of the equilibrium in a flux tube? how are the fields contained? what determines their stability? how are such strong fields formed and maintained? and what limits the maximum field strength?

EXPERIMENTS WITH MOVING MAGNETIZED PLASMA

1963 ◽  
Vol 41 (3) ◽  
pp. 469-477
Author(s):  
P. R. Smy ◽  
A. Offenberger
Keyword(s):  
Field Strength ◽  
Shock Tube ◽  
Momentum Transfer ◽  
Applied Field ◽  
Magnetized Plasma ◽  
Reflected Shock ◽  
Mechanical Measurements ◽  
Maximum Field Strength ◽  
Maximum Field ◽  
Good Agreement

Results of various experiments with moving magnetized plasma produced in a shock tube are presented. It is found that both incident and reflected shock speeds are independent of the applied field strength up to the maximum field strength of 104 gauss. Measurements of the momentum transfer from the magnetized plasma to an essentially diamagnetic ring surrounding the shock tube were accomplished by mechanical and electrical means; the mechanical measurements show good agreement with theory.

scholarly journals Does 𝓿 Cep indicate a non-axisymmetric dynamo?

1986 ◽  
Vol 90 ◽  
pp. 51-54
Author(s):  
F. Krause ◽  
G. Scholz
Keyword(s):  
Magnetic Field ◽  
Field Strength ◽  
Rotation Axis ◽  
Maximum Field Strength ◽  
Maximum Field

AbstractAccording to observations of Scholz and Gerth the super-giant 𝓿 Cep has a magnetic field with a maximum field strength up to 2500 Gauss. This field shows a period of about 5 years. It is unplausible that this magnetic field is a relic since 𝓿 Cep was formed by expansion of a B-star. We claim here that 𝓿 Cep represents a dynamo exciting a magnetic field which in the average strongly deviates from symmetry about the rotation axis.

Research on Electrical Insulating Property of Disk Insulator in High Voltage GIS Insulated Grounding Module

2012 ◽  
Vol 217-219 ◽  
pp. 530-534
Author(s):  
Xian Heng You ◽  
Yu Zhang ◽  
Xin Zhao ◽  
Shao Cheng Gong
Keyword(s):  
Numerical Simulation ◽  
Field Strength ◽  
Potential Distribution ◽  
The Finite Element Method ◽  
Theoretical Support ◽  
Three Phase ◽  
Maximum Field Strength ◽  
Improvement Scheme ◽  
Insulation Coordination ◽  
Maximum Field

Along with the GIS(Gas insulated metal enclosed switch equipment) miniaturization and three-phase common box, GIS disk insulator electrical properties are getting more and more attention of designers. In order to provide the necessary data and the theoretical support to the insulation coordination design of the disk insulator in engineering, the electric field and the potential distribution on the disc insulator surface of 126 kV GIS isolation grounding module are carried out numerical simulation by using the finite element method. And the maximum field strength of simulation are compared to the allowable field strength values of insulators in engineering in order to see whether it has certain insulation margin, thus put forward the improvement scheme of disc insulator structure.

scholarly journals Electrical performance analysis of 110 kv GIS terminal extension conducting rod

2020 ◽  
Vol 185 ◽  
pp. 01020
Author(s):  
Jianjia Duan ◽  
Sanwei Liu ◽  
Zeyu Zeng ◽  
Fuyong Huang ◽  
Xiaoli Duan
Keyword(s):  
Finite Element ◽  
Field Strength ◽  
Contact Resistance ◽  
Sulfur Hexafluoride ◽  
Electrical Performance ◽  
Stable Operation ◽  
Element Simulation ◽  
Simulation Calculation ◽  
Maximum Field Strength ◽  
Maximum Field

As GIS terminal is in cooperation with GIS switch, the GIS terminal with 470 mm structure is usually equipped with a 757 mm structure GIS switch. In order to study the influence of the extended conductive pole on the electrical performance of GIS cable terminal, the contact resistance of the extended conductive pole is measured. The measurement results show that the contact resistance meets the requirements of conductive flow. Through finite element simulation calculation of the influence of the extended conducting rod on the GIS terminal electric field distribution, it was found that the maximum field strength of the cable terminal of the extended conducting rod increased by 2 kv/mm, which was smaller than the breakdown field strength of sulfur hexafluoride gas, and the extended conducting rod did not affect the safe and stable operation of the GIS terminal. Extend the conductive rod by finite element simulation calculation interface without air gap and 0.1 mm gap, the distribution of electric field in both cases, contact resistance conforms to the requirements under the premise, extend the conductive rod interface is 0.1 mm gap the maximum field strength of 1.4 kv/mm, less than the sulfur hexafluoride gas breakdown voltage, contact air gap does not affect the safe and stable operation of the GIS terminal.

Comparison of the Normalized Maximum Field Strength Using E-Field Probe and VNA Methods in a Reverberation Chamber

2019 ◽  
Vol 18 (10) ◽  
pp. 2135-2139
Author(s):  
Qian Xu ◽  
Kai Chen ◽  
Xueqi Shen ◽  
Weihong Li ◽  
Yongjiu Zhao ◽  
...  
Keyword(s):  
Field Strength ◽  
Reverberation Chamber ◽  
Maximum Field Strength ◽  
Maximum Field
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