CA2092741C - In-line isolator - Google Patents
In-line isolator Download PDFInfo
- Publication number
- CA2092741C CA2092741C CA 2092741 CA2092741A CA2092741C CA 2092741 C CA2092741 C CA 2092741C CA 2092741 CA2092741 CA 2092741 CA 2092741 A CA2092741 A CA 2092741A CA 2092741 C CA2092741 C CA 2092741C
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- CA
- Canada
- Prior art keywords
- power line
- insulators
- end pieces
- insulator
- isolating
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
- H02G7/00—Overhead installations of electric lines or cables
- H02G7/04—Arrangements or devices for relieving mechanical tension
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B17/00—Insulators or insulating bodies characterised by their form
- H01B17/02—Suspension insulators; Strain insulators
- H01B17/12—Special features of strain insulators
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H31/00—Air-break switches for high tension without arc-extinguishing or arc-preventing means
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
- H02G1/00—Methods or apparatus specially adapted for installing, maintaining, repairing or dismantling electric cables or lines
- H02G1/02—Methods or apparatus specially adapted for installing, maintaining, repairing or dismantling electric cables or lines for overhead lines or cables
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- Insulators (AREA)
Abstract
An isolating assembly for an overhead power line has a main sub-assembly formed of two parallel spaced insulators joined at their ends by aluminum end pieces. The end pieces each have a slot aligned with the space between the two insulators and a rod projecting from the end piece in alignment with the slot but below the slot. This arrangement enables the sub-assembly to be hung on a hot power line with the line passing along the slots and the space between the insulators. The rods may be clamped to the line by any suitable device such as wedges and C-shaped clamps. With the sub-assembly thus mechanically and electrically connected securely to the line, the line can be severed at a location between the end pieces and the free ends forced apart.
Description
IN-LINE ISOLATOR
Background of the Invention This invent7~on relates to isolating overhead power lines.
The most common way to effect such isolation is to use an assembly which includes two full tension clamps (dead ends) and an insulator in between them. The first full tension clamp is fixed to an overhead line allowing the rest of the assembly to hang freely from the power lir,~e. In some cases hooks can support the assembly closer to the power line as to keep the assembly from hanging down and possibly malting contact with live lines. A mechanical hoist is then attached to the power line away from the assembly. The other end of the hoist is then attached to the full tension clamp at tla.e free end of the assembly. The hoist is then operated in such a fashion as to take up the assembly parallel to the power line and introduce some slack line in between the clamps at each end of the isolator assembly.
The second full tension clamp is now fastened to the power line. The hoist can now be removed. The power' line tension is now transferred through the isolator assembly and the short portion of line in between the two clamps bulges due to the lack of tension on that portion_ This line portion can now be cut and separated to isolate the line.
The assembly is now mechanically connected between cut ends of the line. Often the assembly also includes a switch connected in parallel across the insulator and both ends of the switch now have to be connected electrically to respective portions of the cut line. This may be done using C-shaped members and wedges.
67789-330(S) This technique is time consuming and difficult for one man to carry out particularly because of the need for a hoist.
Another technique has been proposed in United States Patent 4,814,550. This technique involves an isolating apparatus having clamps pivotally mounted at opposite ends of an insulator. The clamps can be secured to the power line such that the insulator lies below and parallel to the line, and thereafter the power line can be severed between the clamps.
One reason that this apparatus has not found acceptance in practice is that, after the line is cut, there is an immediate and sudden straightening of the apparatus caused by the tension in the line and gives rise to severe forces in the line and particularly at the clamps.
It is an objeci~ of the invention to provide an improved isolating apparatus and method.
Summary of the Invention In its broadesi~ form, the instant invention involves the use of an offset insulator which can be clamped at opposite ends to the live power .Line. The one clamping action provides both a mechanical and electrical connection to the line.
Because the insulator is offset, after the clamping step the line runs parallel to and spaced from the insulator.
The line may then be cuts between the clamped portions and the severed ends bent away from each other or the section can be cut out. There is no whipping of the line after severing because the offset allows the insulator to be clamped without displacing the line from its natural lie and because there is no pivotal connection between the ends of the insulator and the clamps.
Background of the Invention This invent7~on relates to isolating overhead power lines.
The most common way to effect such isolation is to use an assembly which includes two full tension clamps (dead ends) and an insulator in between them. The first full tension clamp is fixed to an overhead line allowing the rest of the assembly to hang freely from the power lir,~e. In some cases hooks can support the assembly closer to the power line as to keep the assembly from hanging down and possibly malting contact with live lines. A mechanical hoist is then attached to the power line away from the assembly. The other end of the hoist is then attached to the full tension clamp at tla.e free end of the assembly. The hoist is then operated in such a fashion as to take up the assembly parallel to the power line and introduce some slack line in between the clamps at each end of the isolator assembly.
The second full tension clamp is now fastened to the power line. The hoist can now be removed. The power' line tension is now transferred through the isolator assembly and the short portion of line in between the two clamps bulges due to the lack of tension on that portion_ This line portion can now be cut and separated to isolate the line.
The assembly is now mechanically connected between cut ends of the line. Often the assembly also includes a switch connected in parallel across the insulator and both ends of the switch now have to be connected electrically to respective portions of the cut line. This may be done using C-shaped members and wedges.
67789-330(S) This technique is time consuming and difficult for one man to carry out particularly because of the need for a hoist.
Another technique has been proposed in United States Patent 4,814,550. This technique involves an isolating apparatus having clamps pivotally mounted at opposite ends of an insulator. The clamps can be secured to the power line such that the insulator lies below and parallel to the line, and thereafter the power line can be severed between the clamps.
One reason that this apparatus has not found acceptance in practice is that, after the line is cut, there is an immediate and sudden straightening of the apparatus caused by the tension in the line and gives rise to severe forces in the line and particularly at the clamps.
It is an objeci~ of the invention to provide an improved isolating apparatus and method.
Summary of the Invention In its broadesi~ form, the instant invention involves the use of an offset insulator which can be clamped at opposite ends to the live power .Line. The one clamping action provides both a mechanical and electrical connection to the line.
Because the insulator is offset, after the clamping step the line runs parallel to and spaced from the insulator.
The line may then be cuts between the clamped portions and the severed ends bent away from each other or the section can be cut out. There is no whipping of the line after severing because the offset allows the insulator to be clamped without displacing the line from its natural lie and because there is no pivotal connection between the ends of the insulator and the clamps.
6789-330(S) In a preferred embodiment the isolating apparatus is formed of two parallel spaced insulators interconnected by aluminum end pieces which are clamped to the line after the apparatus is hung on the line with the line passing along the space between the insulators.
In summary, according to one aspect the invention provides an isolating apparatus for an electric power line comprising an elongate insulator having opposite ends, two electrically conductive end pieces and two electrically conductive clamps, wherein each end piece is non-pivotably secured to a respective end of the insulator and includes a rod, the rods of the end pieces being mutually aligned and extending parallel to the insulator, each end piece having a slot and a keeper bar, the slots of the end pieces being aligned to receive the power line, and the clamps being arranged to cooperate with the rods to secure the isolating apparatus to the power line whereby when thus secured the power line may be cut at a position intermediate the ends of the insulator.
According to another aspect the invention provides an isolating apparatus for an electric power line comprising an elongate insulator having opposite ends, two electrically conductive clamps and two electrically conductive end pieces respectively located at the opposite ends of the insulator, wherein each end piece comprises a rod rigidly secured to a portion of the end piece which is offset with respect to the rod, the offset portions of the end pieces being rigidly secured to the respective opposite ends of the insulator and the rods being in mutual alignment and cooperating with respective ones of the clamps to clamp the isolating apparatus to the power line such that the insulator is 6'?789-330 (S) parallel to but offset from the power line whereby, with the isolating apparatus secured to the power line, the power line may be cut at a position intermediate the ends of the insulator, each end piece having a slot aligned with the rods for receiving the power line and each end piece having a keeper bar selectively movable to a position bridging the slot.
According to another aspect the invention provides a method of electrically isolating a power line comprising:
securing opposite ends of an isolating apparatus as described in either of the two preceding paragraphs non-pivotally to the power line such that the insulator runs parallel to but offset from the power line; and cutting the power line between the opposite ends of the insulator.
According to another aspect, the invention provides a method of electrically isolating a power line comprising: hanging a power line isolating apparatus on the power line, the apparatus comprising two elongate substantially identical insulators, two electrically conductive end pieces secured to opposite ends of the insulators and holding the insulators in parallel spaced relationship, such that the power line runs parallel to and between the insulators; clamping the end pieces to the power line; and cutting the power line between the end pieces.
According to a further aspect the invention provides an isolating apparatus for an electric power line comprising two elongate substantially identical insulators, two electrically conductive end pieces and two electrically conductive clamps, wherein each end piece is non-pivotally secured to a respective end of both insulators such that the insulators are parallel and coextensive, each end piece 3a 6?789-330(S) including a rod, the rods of the end pieces being mutually aligned and extending parallel to the insulators, each end piece having a slot and a keeper bar, the slots of the end pieces being aligned to receive the power line parallel to and between the insulators, and the clamps being arranged to cooperate with the rods to secure the isolating apparatus to the power line, whereby when thus secured the power line may be cut at a position intermediate the ends of the insulators.
According to yet another aspect the invention provides a method of electrically isolating a power line comprising: securing opposite ends of an isolating apparatus as described in the immediately preceding paragraphs non-pivotally to the power line such that the insulators run parallel to but offset from the power line; and cutting the power line between the opposite ends of the insulators.
According to a final aspect the invention provides an isolating apparatus for an electric power line comprising two elongate substantially identical insulators; power line securing means for securing opposite ends of the insulators to the power line, comprising a pair of end pieces having the respective ends of said insulators secured thereto in mutually spaced apart relation such that the insulators are coextensive and substantially parallel; said power line securing means each being located between said ends of said insulators, whereby, in use, with the insulators secured to the power line the power line is secured in substantially co-planar parallel relation between the insulators and may be cut at a position intermediate said end pieces.
3b 67789-330(S) According to a third broad aspect, the invention provides a method of electrically isolating a power line comprising: securing opposite ends of an elongate insulator non-pivotally to the power line such that the insulator runs parallel to but offset from the power line; and cutting the power line between the opposite ends of the insulator.
According to a fourth broad aspect the invention provides an isolating apparatus for an electric power line comprising two elongate substantially identical insulators and means for securing opposite ends of the insulators to the power line such that the insulators are coextensive and substantially parallel to but offset in opposite directions from the power line, whereby, with the insulators secured to the power line, the power line may be cut at a portion intermediate the ends of the insulators.
According to a fifth broad aspect the invention provides an isolating apparatus for an electric power line comprising two elongate substantially identical insulators, two electrically conductive end pieces secured to opposite ends of the insulators and holding the insulators in parallel spaced relationship and means :for clamping the end pieces to the power line with the power line running parallel to and between the insulators whereby, with the end pieces clamped to the power line, the power line may be cut at a portion intermediate the ends of the insulators.
According to a sixth broad aspect the invention provides a method of electrically isolating a power line comprising: hanging a line isolating apparatus on the power line, the apparatus comprising two elongate substantially identical insulators, two electrically conductive end pieces secured to opposite ends of the insulators and holding the 3a 67789-330(S) insulators in parallel spaced relationship, such that the power line runs parallel to arid between the insulators; clamping the end pieces to the power line; and cutting the power line between the end pieces.
Brief Description of the Drawings Figure 1 is a side elevational, partly exploded view of an isolating assembly a<:cording to the invention;
Figure 2 is a trop view of the main component of the isolating assembly of F_Lgure 1;
Figure 3 is a side elevational view of the isolating assembly shown clamped on a power line;
Figure 4 is a t:op view of the isolating assembly shown clamped on a power line;' Figure 5 is an isometric view of the isolating assembly shown clamped t:o the power line and after the power line has been cut;
Figure 6 is a view similar to Figure 4 but showing a modified form of isolat_Lng assembly;
Figure 7 is a ride view of the isolating assembly shown clamped to the power line and after the power line has been cut and incorporat=Lng a modified clamping arrangement;
Figure 8 is a fragmentary view showing a further type of clamping arrangement;' Figure 9 is a view similar to Figure 3 but showing a further modified form of isolating assembly; and 3b 6789-330(S) Brief Description of the Drawings Figure 1 is a side elevational, partly exploded view of an isolating assembly according to the invention;
Figure 2 is a top view of the main component of the isolating assembly of Figure 1;
Figure 3 is a side elevational view of the isolating assembly shown clamped on a power line;
Figure 4 is a top view of the isolating assembly shown clamped on a power line;
Figure 5 is an isometric view of the isolating assembly shown clamped to the power line and after the power line has been cut;
Figure 6 is a view similar to Figure 4 but showing a modified form of isolating assembly;
Figure 7 is a side view of the isolating assembly shown clamped to the power line and after the power line has been cut and incorporating a modified clamping arrangement;
Figure 8 is a fragmentary view showing a further type of clamping arrangement;
Figure 9 is a view similar to Figure 3 but showing a further modified form of isolating assembly; and Figure 10 is a view similar to Figure 3 but showing an embodiment incorporating a switch.
3c 2~9~741 Detailed Description of the Preferred Embodiments Referring firstly to Figures 1 and 2, the isolating assembly 10 comprises a main component 11, two C-shaped members 12, two wedges 13 and two jumper studs 14.
The main component 11 is formed by 'two aluminum end pieces 15 spaced apart by two identical parallel spaced Insulators 16 each of which typically is formed of a fibreglass rod 17 having a rubberized exterior and a series of spaced integral discs 18 which are also rubberized. Porcelain can also be used for the insulators 16. The insulators 16 are securely connected to the end pieces 15 by any suitable means such as crimping.
Each end piece 15 has a generally rectangular portion 20 having a through slot 21 extending between an inner end 22 and an outer end 23 of rectangular portion 20. The two slots 21 are mutually aligned with an axis extending parallel to and midway between the rods 17. Each end piece also includes a rod 24 which is secured to the rectangular gortion 20 for example by means of a weld and extends from the outer end in alignment with the axis of the slot 21 as seen in Figure 2 but slightly below the level of the slot 21 as seen in Figure 1. The rod 24 may have afi its free end an eye 25 for engagement by a hot stick or hoist.
Each end piece 15 is completed by a keeper bar 28 which is pivotally mounted on a pin 29 extending from the upper face 30 as seen in Figure 2 of rectangular portion 20. The keeper bar 28 may be swung across the slot such that a notch 31 provided in the bar at a location remote from pin 29 engages a stud 32 also extending from upper face 30. A nut (not shown) may be used to 2~9~"l41 engage the stud 32 and secure the keeper bar in the gosition shown in Figure 2.
The two C-shaped members 12 and wedges 13 are also made of aluminum and are well known per se for interconnecting two conductors. The C-shaped members 12 each have; two spaced curved channels 33. The isolating assembly is completed by the two jumper studs 14 which are formed as angled aluminum or tin plated copper rods.
Referring now to Figures 3 to 5, these show the isolating assembly 10 clamped to a power line 35. To apply the isolating assembly to the power line the main component 11 is hung on the power line by aligning the power line 35 along the slots 21 and swinging the keeper bars 28 across the respective slots 21 and securing them to the studs 32 by means of the nuts (not shown .
This step might best be accomplished by firstly laying the main component 11 on top of the line 35, then securing the keeper bars 28 and finally rotating the main component 11 about line 35 such that the keeper bars 28 lie on top of the line 35 as shown in Figures 3 and 4. Other installation practices may be used.
With the main component 11 hung on the power line 35 the C-shaped members 12 can then be hung over the power line 35 in registry respectively with the rods 24 of the end pieces 15.
Thus, a curved channel 33 of each C-shaped member 12 encompasses one of the rods 24 and a portion of power line 35. The jumper studs 14 are then positioned respectively in the other curved channels of the C-shaped members and the wedges 13 are forced unto the C-shaped members by means of a powder actuated tool in a 67789-330(S) manner known per se to clamp the power line 35 securely to the rods 24 and to clamp the jumper studs 14 to the C-shaped members.
Figure 5, which is an isometric view looking from underneath the power 1i e, shows that the rod 24 is preferably contoured on its upper surface in a fashion complementary to that of the curved channel 33 so as to define a generally circular section space for reception of power line 35.
Once the isolating assembly 10 and power line 35 have been clamped together tine power line can be cut by wire snippers at a point lying between the two insulators 16, preferably substantially equidistantly from the end pieces 15.
It is noted that when the power line 35 is cut there is no recoil of the line or movement of the clamps 12, 13. Then, as shown in Figure 5 the two cut ends are forced upwardly and away from each other to isol<~te the power line 35 or the section between the ends can be cut out completely. A jumper cable 36, shown in phantom in Figure 5 may be connected across jumper studs 14 as desired to .re-energise the line.
A jumper cable is only one of several techniques for re-establishing electrical connection across the cut ends of the line. Figure 10 shows a particularly preferred arrangement involving a switch 37 disposed below and parallel to the insulator 16. The switch includes a blade 38 pivotally connected at one end 39 to a first pole piece 40 and selectively engageable at its free end 41 with a second pole piece 42. Pole piece 40 is interconnected with one of the end pieces 15 by means of intermediate members 43 and pole piece 42 is interconnected with t:he other end piece 15 by means of intermediate members 44,.
In summary, according to one aspect the invention provides an isolating apparatus for an electric power line comprising an elongate insulator having opposite ends, two electrically conductive end pieces and two electrically conductive clamps, wherein each end piece is non-pivotably secured to a respective end of the insulator and includes a rod, the rods of the end pieces being mutually aligned and extending parallel to the insulator, each end piece having a slot and a keeper bar, the slots of the end pieces being aligned to receive the power line, and the clamps being arranged to cooperate with the rods to secure the isolating apparatus to the power line whereby when thus secured the power line may be cut at a position intermediate the ends of the insulator.
According to another aspect the invention provides an isolating apparatus for an electric power line comprising an elongate insulator having opposite ends, two electrically conductive clamps and two electrically conductive end pieces respectively located at the opposite ends of the insulator, wherein each end piece comprises a rod rigidly secured to a portion of the end piece which is offset with respect to the rod, the offset portions of the end pieces being rigidly secured to the respective opposite ends of the insulator and the rods being in mutual alignment and cooperating with respective ones of the clamps to clamp the isolating apparatus to the power line such that the insulator is 6'?789-330 (S) parallel to but offset from the power line whereby, with the isolating apparatus secured to the power line, the power line may be cut at a position intermediate the ends of the insulator, each end piece having a slot aligned with the rods for receiving the power line and each end piece having a keeper bar selectively movable to a position bridging the slot.
According to another aspect the invention provides a method of electrically isolating a power line comprising:
securing opposite ends of an isolating apparatus as described in either of the two preceding paragraphs non-pivotally to the power line such that the insulator runs parallel to but offset from the power line; and cutting the power line between the opposite ends of the insulator.
According to another aspect, the invention provides a method of electrically isolating a power line comprising: hanging a power line isolating apparatus on the power line, the apparatus comprising two elongate substantially identical insulators, two electrically conductive end pieces secured to opposite ends of the insulators and holding the insulators in parallel spaced relationship, such that the power line runs parallel to and between the insulators; clamping the end pieces to the power line; and cutting the power line between the end pieces.
According to a further aspect the invention provides an isolating apparatus for an electric power line comprising two elongate substantially identical insulators, two electrically conductive end pieces and two electrically conductive clamps, wherein each end piece is non-pivotally secured to a respective end of both insulators such that the insulators are parallel and coextensive, each end piece 3a 6?789-330(S) including a rod, the rods of the end pieces being mutually aligned and extending parallel to the insulators, each end piece having a slot and a keeper bar, the slots of the end pieces being aligned to receive the power line parallel to and between the insulators, and the clamps being arranged to cooperate with the rods to secure the isolating apparatus to the power line, whereby when thus secured the power line may be cut at a position intermediate the ends of the insulators.
According to yet another aspect the invention provides a method of electrically isolating a power line comprising: securing opposite ends of an isolating apparatus as described in the immediately preceding paragraphs non-pivotally to the power line such that the insulators run parallel to but offset from the power line; and cutting the power line between the opposite ends of the insulators.
According to a final aspect the invention provides an isolating apparatus for an electric power line comprising two elongate substantially identical insulators; power line securing means for securing opposite ends of the insulators to the power line, comprising a pair of end pieces having the respective ends of said insulators secured thereto in mutually spaced apart relation such that the insulators are coextensive and substantially parallel; said power line securing means each being located between said ends of said insulators, whereby, in use, with the insulators secured to the power line the power line is secured in substantially co-planar parallel relation between the insulators and may be cut at a position intermediate said end pieces.
3b 67789-330(S) According to a third broad aspect, the invention provides a method of electrically isolating a power line comprising: securing opposite ends of an elongate insulator non-pivotally to the power line such that the insulator runs parallel to but offset from the power line; and cutting the power line between the opposite ends of the insulator.
According to a fourth broad aspect the invention provides an isolating apparatus for an electric power line comprising two elongate substantially identical insulators and means for securing opposite ends of the insulators to the power line such that the insulators are coextensive and substantially parallel to but offset in opposite directions from the power line, whereby, with the insulators secured to the power line, the power line may be cut at a portion intermediate the ends of the insulators.
According to a fifth broad aspect the invention provides an isolating apparatus for an electric power line comprising two elongate substantially identical insulators, two electrically conductive end pieces secured to opposite ends of the insulators and holding the insulators in parallel spaced relationship and means :for clamping the end pieces to the power line with the power line running parallel to and between the insulators whereby, with the end pieces clamped to the power line, the power line may be cut at a portion intermediate the ends of the insulators.
According to a sixth broad aspect the invention provides a method of electrically isolating a power line comprising: hanging a line isolating apparatus on the power line, the apparatus comprising two elongate substantially identical insulators, two electrically conductive end pieces secured to opposite ends of the insulators and holding the 3a 67789-330(S) insulators in parallel spaced relationship, such that the power line runs parallel to arid between the insulators; clamping the end pieces to the power line; and cutting the power line between the end pieces.
Brief Description of the Drawings Figure 1 is a side elevational, partly exploded view of an isolating assembly a<:cording to the invention;
Figure 2 is a trop view of the main component of the isolating assembly of F_Lgure 1;
Figure 3 is a side elevational view of the isolating assembly shown clamped on a power line;
Figure 4 is a t:op view of the isolating assembly shown clamped on a power line;' Figure 5 is an isometric view of the isolating assembly shown clamped t:o the power line and after the power line has been cut;
Figure 6 is a view similar to Figure 4 but showing a modified form of isolat_Lng assembly;
Figure 7 is a ride view of the isolating assembly shown clamped to the power line and after the power line has been cut and incorporat=Lng a modified clamping arrangement;
Figure 8 is a fragmentary view showing a further type of clamping arrangement;' Figure 9 is a view similar to Figure 3 but showing a further modified form of isolating assembly; and 3b 6789-330(S) Brief Description of the Drawings Figure 1 is a side elevational, partly exploded view of an isolating assembly according to the invention;
Figure 2 is a top view of the main component of the isolating assembly of Figure 1;
Figure 3 is a side elevational view of the isolating assembly shown clamped on a power line;
Figure 4 is a top view of the isolating assembly shown clamped on a power line;
Figure 5 is an isometric view of the isolating assembly shown clamped to the power line and after the power line has been cut;
Figure 6 is a view similar to Figure 4 but showing a modified form of isolating assembly;
Figure 7 is a side view of the isolating assembly shown clamped to the power line and after the power line has been cut and incorporating a modified clamping arrangement;
Figure 8 is a fragmentary view showing a further type of clamping arrangement;
Figure 9 is a view similar to Figure 3 but showing a further modified form of isolating assembly; and Figure 10 is a view similar to Figure 3 but showing an embodiment incorporating a switch.
3c 2~9~741 Detailed Description of the Preferred Embodiments Referring firstly to Figures 1 and 2, the isolating assembly 10 comprises a main component 11, two C-shaped members 12, two wedges 13 and two jumper studs 14.
The main component 11 is formed by 'two aluminum end pieces 15 spaced apart by two identical parallel spaced Insulators 16 each of which typically is formed of a fibreglass rod 17 having a rubberized exterior and a series of spaced integral discs 18 which are also rubberized. Porcelain can also be used for the insulators 16. The insulators 16 are securely connected to the end pieces 15 by any suitable means such as crimping.
Each end piece 15 has a generally rectangular portion 20 having a through slot 21 extending between an inner end 22 and an outer end 23 of rectangular portion 20. The two slots 21 are mutually aligned with an axis extending parallel to and midway between the rods 17. Each end piece also includes a rod 24 which is secured to the rectangular gortion 20 for example by means of a weld and extends from the outer end in alignment with the axis of the slot 21 as seen in Figure 2 but slightly below the level of the slot 21 as seen in Figure 1. The rod 24 may have afi its free end an eye 25 for engagement by a hot stick or hoist.
Each end piece 15 is completed by a keeper bar 28 which is pivotally mounted on a pin 29 extending from the upper face 30 as seen in Figure 2 of rectangular portion 20. The keeper bar 28 may be swung across the slot such that a notch 31 provided in the bar at a location remote from pin 29 engages a stud 32 also extending from upper face 30. A nut (not shown) may be used to 2~9~"l41 engage the stud 32 and secure the keeper bar in the gosition shown in Figure 2.
The two C-shaped members 12 and wedges 13 are also made of aluminum and are well known per se for interconnecting two conductors. The C-shaped members 12 each have; two spaced curved channels 33. The isolating assembly is completed by the two jumper studs 14 which are formed as angled aluminum or tin plated copper rods.
Referring now to Figures 3 to 5, these show the isolating assembly 10 clamped to a power line 35. To apply the isolating assembly to the power line the main component 11 is hung on the power line by aligning the power line 35 along the slots 21 and swinging the keeper bars 28 across the respective slots 21 and securing them to the studs 32 by means of the nuts (not shown .
This step might best be accomplished by firstly laying the main component 11 on top of the line 35, then securing the keeper bars 28 and finally rotating the main component 11 about line 35 such that the keeper bars 28 lie on top of the line 35 as shown in Figures 3 and 4. Other installation practices may be used.
With the main component 11 hung on the power line 35 the C-shaped members 12 can then be hung over the power line 35 in registry respectively with the rods 24 of the end pieces 15.
Thus, a curved channel 33 of each C-shaped member 12 encompasses one of the rods 24 and a portion of power line 35. The jumper studs 14 are then positioned respectively in the other curved channels of the C-shaped members and the wedges 13 are forced unto the C-shaped members by means of a powder actuated tool in a 67789-330(S) manner known per se to clamp the power line 35 securely to the rods 24 and to clamp the jumper studs 14 to the C-shaped members.
Figure 5, which is an isometric view looking from underneath the power 1i e, shows that the rod 24 is preferably contoured on its upper surface in a fashion complementary to that of the curved channel 33 so as to define a generally circular section space for reception of power line 35.
Once the isolating assembly 10 and power line 35 have been clamped together tine power line can be cut by wire snippers at a point lying between the two insulators 16, preferably substantially equidistantly from the end pieces 15.
It is noted that when the power line 35 is cut there is no recoil of the line or movement of the clamps 12, 13. Then, as shown in Figure 5 the two cut ends are forced upwardly and away from each other to isol<~te the power line 35 or the section between the ends can be cut out completely. A jumper cable 36, shown in phantom in Figure 5 may be connected across jumper studs 14 as desired to .re-energise the line.
A jumper cable is only one of several techniques for re-establishing electrical connection across the cut ends of the line. Figure 10 shows a particularly preferred arrangement involving a switch 37 disposed below and parallel to the insulator 16. The switch includes a blade 38 pivotally connected at one end 39 to a first pole piece 40 and selectively engageable at its free end 41 with a second pole piece 42. Pole piece 40 is interconnected with one of the end pieces 15 by means of intermediate members 43 and pole piece 42 is interconnected with t:he other end piece 15 by means of intermediate members 44,.
67789-330(S) Instead of the insulators 16 being displaced laterally (in the horizontal plane), the isolating assembly could be rotated 90° so that the insulators are both located in the vertical plane or the assembly could be 5 rotated to any intermediate position.
Referring now to Figure 6, this shows a form of the invention in which one of the insulators 16 has been dispensed with, leaving only a single insulator 16 offset laterally with respect to the axis of the power line 35.
10 Instead of offsetting the single insulator laterally it may be offset instead vertically above or below the power line as illustrated in Figure 9.
With reference to Figure 7, this shows that instead of clamping means illustrated in Figures 1 to 6 a bolted clamping mechanism could be used. This again involves the use of a C-shaped member 12' and a wedge 13' but these two members are interconnected by a screw 46 which can be turned to force the wedge into the C-shaped member thereby clamping the power line 35 to the rod 24 of the isolating assembly. Figure 7 also shows the optional use of stirrups 47 instead of angled jumper studs 14.
Finally, Figure 8 shows yet another type of clamping mechanism known per se, a so-called wave clamp which involves the use of a member 48 secured opposite the rod 24 by means of U-shaped bolts 49 and nuts 50.
Tightening of the nuts 50 clamps power line 35 between member 48 and rod 24.
Referring now to Figure 6, this shows a form of the invention in which one of the insulators 16 has been dispensed with, leaving only a single insulator 16 offset laterally with respect to the axis of the power line 35.
10 Instead of offsetting the single insulator laterally it may be offset instead vertically above or below the power line as illustrated in Figure 9.
With reference to Figure 7, this shows that instead of clamping means illustrated in Figures 1 to 6 a bolted clamping mechanism could be used. This again involves the use of a C-shaped member 12' and a wedge 13' but these two members are interconnected by a screw 46 which can be turned to force the wedge into the C-shaped member thereby clamping the power line 35 to the rod 24 of the isolating assembly. Figure 7 also shows the optional use of stirrups 47 instead of angled jumper studs 14.
Finally, Figure 8 shows yet another type of clamping mechanism known per se, a so-called wave clamp which involves the use of a member 48 secured opposite the rod 24 by means of U-shaped bolts 49 and nuts 50.
Tightening of the nuts 50 clamps power line 35 between member 48 and rod 24.
67789-330(S) It is envisaged that with appropriate minor refinements the apparatus could be installed using a hot stick but in its present form it is more appropriately applied directly.
7a
7a
Claims (15)
1. ~An isolating apparatus for an electric power line comprising an elongate insulator having opposite ends, two electrically conductive end pieces and two electrically conductive clamps, wherein each end piece is non-pivotably secured to a respective end of the insulator and includes a rod, the rods of the end pieces being mutually aligned and extending parallel to the insulator, each end piece having a slot and a keeper bar, the slots of the end pieces being aligned to receive the power line, and the clamps being arranged to cooperate with the rods to secure the isolating apparatus to the power line whereby when thus secured the power line may be cut at a position intermediate the ends of the insulator.
2. ~An isolating apparatus according to claim 1 wherein each clamp is a wedge clamp comprising a C-shaped member having two spaced curved channels and a wedge, whereby the power line is received between one of the curved channels and the respective end piece rod and the wedge is received between the rod and the other curved channel.
3. ~An isolating apparatus according to claim 1 wherein each clamp is a wave clamp.
4. ~An isolating apparatus for an electric power line comprising an elongate insulator having opposite ends, two electrically conductive clamps and two electrically conductive end pieces respectively located at the opposite ends of the insulator, wherein each end piece comprises a rod rigidly secured to a portion of the end piece which is offset with respect to the rod, the offset portions of the end pieces being rigidly secured to the respective opposite ends of the insulator and the rods being in mutual alignment and cooperating with respective ones of the clamps to clamp the isolating apparatus to the power line such that the insulator is parallel to but offset from the power line whereby, with the isolating apparatus secured to the power line, the power line may be cut at a position intermediate the ends of the insulator, each end piece having a slot aligned with the rods for receiving the power line and each end piece having a keeper bar selectively movable to a position bridging the slot.
5. ~An isolating apparatus according to any one of claims 1 to 4 comprising a switch means mechanically and electrically connected to the end pieces and extending generally parallel to the insulator for controlling the flow of electricity.
6. ~A method of electrically isolating a power line comprising: hanging a power line isolating apparatus on the power line, the apparatus comprising two elongate substantially identical insulators, two electrically conductive end pieces secured to opposite ends of the insulators and holding the insulators in parallel spaced relationship, such that the power line runs parallel to and between the insulators; clamping the end pieces to the power line; and cutting the power line between the end pieces.
7. A method of electrically isolating a power line comprising: securing opposite ends of an isolating apparatus as claimed in any one of claims 1 to 5 non-pivotally to the power line such that the insulator runs parallel to but offset from the power line; and cutting the power line between the opposite ends of the insulator.
8. ~An isolating apparatus for an electric power line comprising two elongate substantially identical insulators, two electrically conductive end pieces and two electrically conductive clamps, wherein each end piece is non-pivotally secured to a respective end of both insulators such that the insulators are parallel and coextensive, each end piece including a rod, the rods of the end pieces being mutually aligned and extending parallel to the insulators, each end piece having a slot and a keeper bar, the slots of the end pieces being aligned to receive the power line parallel to and between the insulators, and the clamps being arranged to cooperate with the rods to secure the isolating apparatus to the power line, whereby when thus secured the power line may be cut at a position intermediate the ends of the insulators.
9. ~An isolating apparatus according to claim 8 wherein each clamp is a wedge clamp comprising a C-shaped member having two spaced curved channels and a wedge, whereby the power line is received between one of the curved channels and the respective end piece rod and the wedge is received between the rod and the other curved channel.
10. An isolating apparatus according to claim 8 wherein each clamp is a wave clamp.
11. A method of electrically isolating a power line comprising: securing opposite ends of an isolating apparatus as claimed in any one of claims 8 to 10 non-pivotally to the power line such that the insulators run parallel to but offset from the power line; and cutting the power line between the opposite ends of the insulators.
12. An isolating apparatus for an electric power line comprising two elongate substantially identical insulators;
power line securing means for securing opposite ends of the insulators to the power line, comprising a pair of end pieces having the respective ends of said insulators secured thereto in mutually spaced apart relation such that the insulators are coextensive and substantially parallel; said power line securing means each being located between said ends of said insulators, whereby, in use, with the insulators secured to the power line the power line is secured in substantially co-planar parallel relation between the insulators and may be cut at a position intermediate said end pieces.
power line securing means for securing opposite ends of the insulators to the power line, comprising a pair of end pieces having the respective ends of said insulators secured thereto in mutually spaced apart relation such that the insulators are coextensive and substantially parallel; said power line securing means each being located between said ends of said insulators, whereby, in use, with the insulators secured to the power line the power line is secured in substantially co-planar parallel relation between the insulators and may be cut at a position intermediate said end pieces.
13. An isolating apparatus according to claim 12 in which the end pieces are electrically conductive and the means for securing opposite ends of the insulators to the power line are electrically conductive clamps arranged to secure the electrically conductive end pieces to the power line.
14. The isolating apparatus according to claim 12, said end pieces each being electrically conductive; said end pieces including jumper line attachment means, in use to receive the ends of a jumper line in secured, electrically conductive relation therewith, to facilitate re-establishment of service by said electric power line.
15. The isolation apparatus according to claim 12, said end pieces including jumper line attachment means in respective electrical connecting relation with said power line securing means, in use to receive the ends of a jumper line in secured, electrically conductive relation with said power line, to facilitate re-establishment of service by said electric power line.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2092741 CA2092741C (en) | 1993-03-26 | 1993-03-26 | In-line isolator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2092741 CA2092741C (en) | 1993-03-26 | 1993-03-26 | In-line isolator |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2092741A1 CA2092741A1 (en) | 1994-09-27 |
| CA2092741C true CA2092741C (en) | 2004-05-25 |
Family
ID=4151371
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2092741 Expired - Fee Related CA2092741C (en) | 1993-03-26 | 1993-03-26 | In-line isolator |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2092741C (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA2135263C (en) * | 1994-11-07 | 2004-05-11 | Rocco Valentino Laricchia | Positive locking mechanism for in-line switch |
| US7943871B2 (en) | 2008-01-09 | 2011-05-17 | Hubbell Incorporated | Rotational stabilizer |
| US8044309B2 (en) | 2008-12-23 | 2011-10-25 | Tyco Electronics Corporation | Isolating apparatus for electric power lines and methods for forming and using the same |
| US8198558B2 (en) | 2009-06-11 | 2012-06-12 | Tyco Electronics Corporation | Cable termination systems and isolating apparatus for electrical power transmission conductors and methods using the same |
| US9876348B2 (en) | 2014-09-05 | 2018-01-23 | Te Connectivity Corporation | In-line cable termination systems for electrical power transmission cables and methods using the same |
-
1993
- 1993-03-26 CA CA 2092741 patent/CA2092741C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CA2092741A1 (en) | 1994-09-27 |
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| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| MKLA | Lapsed |