Electricity: electrical systems and devices – Safety and protection of systems and devices – Transient responsive
Patent
1996-05-02
1998-02-24
Gaffin, Jeffrey A.
Electricity: electrical systems and devices
Safety and protection of systems and devices
Transient responsive
361 91, H02H 322
Patent
active
057216606
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a wiring structure for reducing transient impedance, which is suitable for reducing transient impedance (surge impedance) for an electric current path without using any special device, and which in particular can reduce the transient impedance for an electric current path just by the provision of a simple wiring structure.
BACKGROUND ART
In the prior art, even with circuitry and grounding wiring which are influenced by transient impedance, a first electric current path has been simply abutted against a second electric current path in the shape of a letter T.
Further, with grounding wiring, a buried so called counterpoise long wire has been provided.
In cases like these, in extremity, a method to make for example the grounding transient impedance small has been to cover the earth with an extended conductor (a copper plate or the like); but, since there are problems of difficulty and increase of cost and so on with carrying out this method, the earth has been constructed with a conductor which is restricted to mesh or the like.
In this case, although the basis of reducing the transient impedance is to determine the electric current path as seen from the electric current input point so as to make it as large as possible, nevertheless it is desirable to be able to realize a low transient impedance using as small a quantity of conductor as possible, since there are problems with regard to the manner in which the work is to be performed, and with regard to the amount of conductor required.
However, with this prior art type of circuitry or grounding wiring, it is not possible to reduce the transient impedance, and, in order to reduce the transient impedance with this type of wiring structure, problems have arisen of the type described above with respect to increase of cost and the like.
Accordingly, the present invention has as its object to propose a wiring structure which can reduce the transient impedance, without entailing any of the faulty points of the prior art wiring structures, and further with a simple structure and at a low cost.
DISCLOSURE OF THE INVENTION
The present invention comprises: a first electric current path comprising a surge input point (o) and a branch point (a) on the reflected current side of said surge input point; a second electric current path comprising two terminal end points (d) and (e) at which reflected waves due to surge are generated, and connection points (b) and (c) in positions each a distance (d.sub.2) from both said two terminal end points (d) and (e); and branch electric current paths of substantially the same length which connect said branch point (a) and both the connection points (b) and (c). According to this construction, it is possible to anticipate an effective lowering of the transient impedance, while using an extremely simple structure, and moreover by adding a wiring structure of the minimum required limit. Although it is known that the effectiveness of reduction of the transient impedance is increased by making the apertures of a mesh smaller, the most distinguished feature of the present invention is that the maximum beneficial effect is increased, even by adding the required minimum limit of wiring structure to an already existing electric current circuit. Further, the present invention is very economical, because no special device or the like is required.
Further, in the present invention, instead of the surge current input point (o) of the first electric current path, one of the terminal ends (d) and (e) of the second electric current path may be used as the surge current input point.
According to this concept, the range of application can be extended with an extremely simple structure, and it is possible to obtain various forms of application.
Further, in the present invention, when the electric current paths are calculated as though without loss, the distance (d.sub.1) between the connection points (b) and (c) may be twice the distance (d.sub.2). According to this concept, it is possible to
REFERENCES:
patent: 1651449 (1927-04-01), Evans
Kato Shohei
Mizobe Kunitaka
Gaffin Jeffrey A.
Medley Sally C.
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