Electricity: conductors and insulators – Conduits – cables or conductors – Combined
Reexamination Certificate
1995-06-07
2001-11-20
Paladini, Albert W. (Department: 2841)
Electricity: conductors and insulators
Conduits, cables or conductors
Combined
C174S068200, C174S0720TR, C174S08800C, C174S098000
Reexamination Certificate
active
06320132
ABSTRACT:
BACKGROUND OF THE INVENTION—FIELD OF THE INVENTION
This invention relates to electrical power transmission equipment, specifically to three-phase electrical power transmission equipment and to direct current electrical power transmission equipments.
BACKGROUND OF THE INVENTION—DESCRIPTION OF THE PRIOR ART
Means for transmitting three-phase electrical power are known and include conventional lines and cabling used in utility, industrial and nautical applications. Means for transmitting direct current electrical power are also known.
A disadvantage associated with conventional transmission lines is that substantial inductance may be present.
An additional problem inherent in much of the prior art equipment for transmitting three-phase electrical power is lack of impedance balance between phases.
There is a continuing need in heavy duty industrial and nautical applications for three-phase electrical power transmission equipment having a high degree of impedance match among phases while having low inductance. Additionally, there is a continuing need for such equipment in small, light-weight form. Small size and light weight are especially desirable characteristics in three-phase power transmission equipment intended for nautical applications.
There is also a continuing need in heavy duty industrial and nautical applications for direct current power transmission equipment having high efficiency with minimal component costs and exhibiting minimal cost for installation and replacement. Such direct current power transmission equipment should have minimum size, minimum mass and exhibit maximum survivability with low fire hazard in the event of a catastrophe; this is especially desirable for nautical applications.
SUMMARY OF THE INVENTION
In one preferred embodiment this invention provides a bus for transmitting three-phase electrical power having longitudinally elongated insulatively sandwiched lamina for carrying respective power phases with respective phase lamina having substantially equal cross-sectional areas at respective transverse locations within the sandwich.
In another of its aspects in the preferred embodiment this invention provides apparatus for transmitting three-phase electrical power including a sandwich of insulatively layered longitudinally elongated lamina for carrying respective power phases in respective three-phase alternating disposition respecting a vertical direction along a lateral direction within the sandwich.
In yet another of its aspects in a preferred embodiment this invention provides a three-phase electrical power bus which includes a conduit. The bus further includes a plurality of electrically conductive longitudinally elongated members within the conduit. A first one of those members has a central portion and respective extremity portions extending substantially in a vertical direction from the central portion. The extremity portions are respectively offset relative to the central portion along a lateral direction.
Second ones of the elongated members of the plurality of electrically conductive longitudinally elongated members have respective portions offset from one another in the lateral direction by an amount substantially that of the amount of offset of respective first member extremity portions relative to the central portion of the first member.
The bus further includes third ones of the plurality of electrically conductive longitudinally elongated members where the third ones are of length in the vertical direction substantially that of the offset portions of the second ones of the elongated members and of the central and extremity portions of the first one of the elongated members.
In the bus as assembled the second members have respective portions which insulatively overlap the first member central portion on opposite sides. The second member offsets are substantially aligned with respective offsets of the first member so that remaining portions of the respective second members are proximate respective extremity portions of the first member.
Further, in the bus as assembled respective ones of the third members are substantially aligned in the lateral direction with the respective remaining portions of the second members and insulatively sandwich respective remaining extremity portions of the second members between such a respective third member and a respective extremity portion of the first member.
In yet another of its aspects the preferred embodiment of the invention may be considered to provide a bus for transmitting three-phase electrical power which includes a plurality of electrically conductive longitudinally elongated lamina having transversely offset parts respecting one another and a plurality of electrically conductive longitudinally elongated lamina devoid of offsets. When assembled, the bus has lamina of the pluralities nested together with each of the offsets being transversely aligned with an offset of another member of the first plurality and with a lateral extremity of a lamina of the second plurality.
In the embodiment of the invention preferred for carrying three-phase electrical power, the lamina carrying respective phases of the three-phase electrical power are in an overlapping insulated sandwich disposition with lamina carrying each of the phases having substantially equal transverse cross-sectional area proximate the exterior of the lamina sandwich. Similarly, lamina carrying each of the phases have substantially equal transverse cross-sectional area at respective transverse locations within the lamina sandwich. Most desirably, the offsets in the lamina are perpendicular.
When assembled into the bus, the lamina of the second plurality preferably extend transversely to the direction of offset substantially the same length as parts of lamina of the first plurality on respective sides of the offsets. Most preferably, offset of respective parts of the lamina of the first plurality exceeds thickness of the lamina of the first plurality in the direction of offset.
In yet another of its aspects, in the preferred embodiment this invention provides apparatus for connecting respective sections of a bus for transmitting three-phase electrical power where the apparatus includes male and female sections. The male section preferably includes a plurality of longitudinally elongated extendable pins arranged in horizontal and vertical rows for transmitting the respective phases. Pins carrying each. of the phases are respectively preferably generally vertically and horizontally adjacent to pins for respectively carrying respective ones of the remaining two phases. The male section preferably further includes manually operable means for extending and retracting the pins into and out of connecting disposition with a female section of the connecting apparatus.
The female section preferably includes spring-loaded or otherwise radially biased radially expandable receptacle members for receiving respective ones of the pins when extended from the male section. The receptacle members are preferably arranged in horizontal and vertical rows for carrying each of the respective phases with receptacle members carrying each of the phases respectively being vertically and horizontally adjacent to receptacles for respectively carrying the respective two remaining phases.
In the preferred embodiment of the connector aspect of the invention the receptacle members preferably comprise a plurality of longitudinally elongated leaves which are circularly arranged about a longitudinal axis and include outwardly facing concavities defining a transverse annular recess around the exterior of the circularly arranged leaves. The receptacle means further preferably include resilient means residing within the recesses for biasing the leaves radially inwardly.
Most desirably, the receptacle members further include sleeves for receiving respective ones of the pins including annular lips around the sleeve exteriors with the leaves having an inwardly curving hook at a longitudinal extremity remote from the male section. The hook engages the exterior lip pf the sleeve
Barber John P.
Ykema John I.
Paladini Albert W.
Quinn Charles W.
SPD Technologies Inc.
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