Electricity: conductors and insulators – Insulators – Through wall or plate
Reexamination Certificate
2001-12-14
2004-02-17
Reichard, Dean A. (Department: 2831)
Electricity: conductors and insulators
Insulators
Through wall or plate
C174S13800J, C174S188000
Reexamination Certificate
active
06693242
ABSTRACT:
This invention concerns electrical insulator assemblies, and particularly but not exclusively such assemblies usable with power transmission capacitors; and also a method of making such assemblies.
To date difficulties have often been encountered in satisfactorily mounting ceramic insulators on electrical equipment such as power transmission capacitors. Particular difficulties can be encountered with capacitors as these are generally filled with an inflammable liquid. This has particularly been the case due to the fact that precise dimensions cannot be obtained during the firing of ceramics and therefore subsequent precision grinding has sometimes been required. Alternatively, metal soldering has been used but this is generally not sufficiently fire resistant to be wholly satisfactory.
The term “spinning technique” when used in the specification is to be understood as describing a technique where a rotatable wheel or other projection is spun relative to an item, with the item and wheel/projection being urged against each other to shape the item.
According to the present invention there is provided an insulator assembly, the assembly comprising an insulator having a lower part for insulatingly mounting on a member of fixture, and an upper part connectable to an electrical source of the like, the lower part having a mounting bushing thereon sealingly extendible around the insulator, with the mounting bushing engaging in a circumferential groove in the insulator.
The mounting bushing is preferably shaped in situ on the insulator to engage in the groove. The mounting bushing may be shaped by a spinning technique.
A seal may be provided between a part of the mounting bushing and the insulator, and the seal may be made of rubber and desirably silicone rubber.
The insulator at the lower part is preferably non circular in cross-section to prevent relative rotation of the bushing thereon, and may be lobe shaped. A plurality of recesses may be provided to form the non-circular cross-section, and the recesses may be located circumferentially around the insulator, and may interconnect and be of variable depth.
The insulator is preferably made of a ceramic material and desirably porcelain.
The mounting bushing preferably provides a mounting flange. The mounting flange may extend radially or may extend at an in use downwards inclination. The mounting bushing may be made of metal and desirably stainless steel.
The mounting bushing may be in the form of part of the casing for a capacitor or other device.
The top part preferably comprises an electrically conducting connecting member in communication with the interior of the insulator, and a cap member engageable over a part of the connecting member and engageable with the insulator to mount the connecting member thereon.
Also according to the present invention there is provided an insulator assembly, the assembly comprising an insulator having a lower part for insulatingly mounting on a member of fixture, and an upper part connectable to an electrical source or the like, the top part comprising an electrically conducting connecting member in communication with the interior of the insulator, and a cap member engageable over a part of the connecting member and substantially non-rotatably engageable with the insulator to mount the connecting member thereon.
The cap member may be engageable with one or more formations on the insulator to prevent relative rotation. The formations may comprise one or more substantially longitudinal grooves in which one or more corresponding indentations in the cap member are locatable. The cap member may be mounted on the insulator by a spinning technique to cause the cap member to engage with the insulator, and the cap member may engage with a lip on the insulator.
The connecting member may extend through an opening in the cap member. A flange may be provided on the connecting member engageable against the insulator. The cap member may engage against the flange on the connecting member.
A seal may be provided between the connecting member and the insulator and the seal may be locatable between the connecting member and the insulator.
The seal may be made of rubber and desirably silicone rubber.
The connecting member may be in the form of a bolt. The connecting member and/or cap member may be made of brass.
The invention further provides an electrical insulator assembly for a power transmission capacitor, the assembly being according to any of the preceding fourteen paragraphs.
The invention also provides a method of making an electrical insulator assembly, the assembly being according to any of the preceding fifteen paragraphs.
The mounting bushing is preferably located on the insulator whilst the bushing has a substantially cylindrical body which locates over the groove in the insulator, and the cylindrical body is subsequently urged into the groove. The urging is preferably performed by a spinning technique.
The bushing may be glued onto the insulator, and desirably by an epoxy resin glue, prior to the urging being carried out.
When the bushing is part of a casing, the spinning technique is preferably carried out using a portable tool comprising one or more spinable members engageable against the bushing.
The cap member may be mounted on the insulator by a spinning technique, and the indentations in the cap member are preferably formed before the spinning technique.
REFERENCES:
patent: 2845477 (1958-07-01), Kelley et al.
patent: 4031311 (1977-06-01), Mazanek
patent: 4330270 (1982-05-01), Herrold
patent: 4343560 (1982-08-01), Chalmers
patent: 4492817 (1985-01-01), Selby
patent: 4760216 (1988-07-01), Thiel et al.
Nino Adolfo
Reichard Dean A.
Smith-Hill and Bedell
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