S
Sergey Karavashkin
Guest
Dear colleagues,
I would like to share with you 75 jubilee celebration of a talented
scientist and one of my teachers of which you did not know, my Mother
Dyna P. Karavashkina,
http://selftrans.narod.ru/memory/memory.html
Many years ago we two undertook a study which, as you will make sure,
still remains actual, because today contact sparking remains one of
the main problems of electric engineering. Semiconductors only in some
cases are able to substitute contacts, but not in case when we need to
switch the circuit fully off. ;-)
Now I would like to suggest to your attention the paper written after
materials of that old discovery,
*Phenomena at electric contacts breaking direct-current inductive
loads*
Abstract
This paper is devoted to theoretical and experimental study of
physical nature of unstable discharges arising in contact gaps when
opening inductive load. We revealed that despite conventional opinion,
showering arcs are alternating relaxations. Each of them consists of
two stages: monotonous exponential growth of voltage related to the
charging of parasitic capacitance of gap which is shunted by metallic
bridges, and of high-frequency high-voltage oscillation process
related to the high-frequency spark process within the gap. With it,
metallic bridges are produced in each period of unstable discharges.
We analyse the conditions and stipulate the physics of processes of
such bridges formation. We established that the cause of bridge
formation is the electric pressure in high-voltage oscillation process
preceding the monotonous period of unstable discharge. The second
cause are plasma jets able to strap even larger gaps than those
typical for unstable discharges. The experimental results obtained
after this theoretical study fully corroborated the described pattern
of physical processes in showering arcs. On the basis of developed
method to obtain the dynamic curve of breakdown voltage and noting the
experimentally corroborated physics of processes, we have successfully
carried out the work on practical protection of relay contacts working
under inductive load, and presented the result of this protection.
Enjoy reading full text:
http://selftrans.narod.ru/v5_1/discovery/di23/di23.html
Hopefully, this study will be of your interest. It will be my pleasure
if someone, having looked through our work, will get to see the world
wider and more versatile, and that problems of physics are not
confined to Lorentz transformation, Schwarzschild sphere and
Schroedinger equation. ;-) Here also are very many subjects for
development.
Best to you all,
Sergey B. Karavashkin
Head Laboratory SELF
187 apt., 38 bldg.
Prospect Gagarina
Kharkov 61140
Ukraine
Phone: +38 (057) 73706624
e-mail: selftrans@yandex.ru , selflab@mail.ru
http://angelfire.lycos.com/la3/SELFlab/index.html
I would like to share with you 75 jubilee celebration of a talented
scientist and one of my teachers of which you did not know, my Mother
Dyna P. Karavashkina,
http://selftrans.narod.ru/memory/memory.html
Many years ago we two undertook a study which, as you will make sure,
still remains actual, because today contact sparking remains one of
the main problems of electric engineering. Semiconductors only in some
cases are able to substitute contacts, but not in case when we need to
switch the circuit fully off. ;-)
Now I would like to suggest to your attention the paper written after
materials of that old discovery,
*Phenomena at electric contacts breaking direct-current inductive
loads*
Abstract
This paper is devoted to theoretical and experimental study of
physical nature of unstable discharges arising in contact gaps when
opening inductive load. We revealed that despite conventional opinion,
showering arcs are alternating relaxations. Each of them consists of
two stages: monotonous exponential growth of voltage related to the
charging of parasitic capacitance of gap which is shunted by metallic
bridges, and of high-frequency high-voltage oscillation process
related to the high-frequency spark process within the gap. With it,
metallic bridges are produced in each period of unstable discharges.
We analyse the conditions and stipulate the physics of processes of
such bridges formation. We established that the cause of bridge
formation is the electric pressure in high-voltage oscillation process
preceding the monotonous period of unstable discharge. The second
cause are plasma jets able to strap even larger gaps than those
typical for unstable discharges. The experimental results obtained
after this theoretical study fully corroborated the described pattern
of physical processes in showering arcs. On the basis of developed
method to obtain the dynamic curve of breakdown voltage and noting the
experimentally corroborated physics of processes, we have successfully
carried out the work on practical protection of relay contacts working
under inductive load, and presented the result of this protection.
Enjoy reading full text:
http://selftrans.narod.ru/v5_1/discovery/di23/di23.html
Hopefully, this study will be of your interest. It will be my pleasure
if someone, having looked through our work, will get to see the world
wider and more versatile, and that problems of physics are not
confined to Lorentz transformation, Schwarzschild sphere and
Schroedinger equation. ;-) Here also are very many subjects for
development.
Best to you all,
Sergey B. Karavashkin
Head Laboratory SELF
187 apt., 38 bldg.
Prospect Gagarina
Kharkov 61140
Ukraine
Phone: +38 (057) 73706624
e-mail: selftrans@yandex.ru , selflab@mail.ru
http://angelfire.lycos.com/la3/SELFlab/index.html
