WO2018124883A1 - Safety device for electric power cable end - Google Patents

Safety device for electric power cable end Download PDF

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Publication number
WO2018124883A1
WO2018124883A1 PCT/NO2017/050327 NO2017050327W WO2018124883A1 WO 2018124883 A1 WO2018124883 A1 WO 2018124883A1 NO 2017050327 W NO2017050327 W NO 2017050327W WO 2018124883 A1 WO2018124883 A1 WO 2018124883A1
Authority
WO
WIPO (PCT)
Prior art keywords
sleeve
conductors
safety device
electrically conductive
elongated
Prior art date
Application number
PCT/NO2017/050327
Other languages
French (fr)
Inventor
Johnny STAVNEM
Original Assignee
Lyse Elnett As
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Lyse Elnett As filed Critical Lyse Elnett As
Publication of WO2018124883A1 publication Critical patent/WO2018124883A1/en

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R4/00—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation
    • 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
    • H02G15/00—Cable fittings
    • H02G15/02—Cable terminations
    • H02G15/06—Cable terminating boxes, frames or other structures
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R4/00—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation
    • H01R4/58—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation characterised by the form or material of the contacting members
    • H01R4/64—Connections between or with conductive parts having primarily a non-electric function, e.g. frame, casing, rail
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R4/00—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation
    • H01R4/58—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation characterised by the form or material of the contacting members
    • H01R4/64—Connections between or with conductive parts having primarily a non-electric function, e.g. frame, casing, rail
    • H01R4/646—Connections between or with conductive parts having primarily a non-electric function, e.g. frame, casing, rail for cables or flexible cylindrical bodies
    • 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
    • H02G13/00—Installations of lightning conductors; Fastening thereof to supporting structure
    • H02G13/40—Connection to earth
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
    • H02H3/02—Details
    • H02H3/021—Details concerning the disconnection itself, e.g. at a particular instant, particularly at zero value of current, disconnection in a predetermined order
    • H02H3/023—Details concerning the disconnection itself, e.g. at a particular instant, particularly at zero value of current, disconnection in a predetermined order by short-circuiting
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R4/00—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation
    • H01R4/24—Connections using contact members penetrating or cutting insulation or cable strands
    • H01R4/2404—Connections using contact members penetrating or cutting insulation or cable strands the contact members having teeth, prongs, pins or needles penetrating the insulation
    • H01R4/2406—Connections using contact members penetrating or cutting insulation or cable strands the contact members having teeth, prongs, pins or needles penetrating the insulation having needles or pins
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R4/00—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation
    • H01R4/70—Insulation of connections
    • H01R4/72—Insulation of connections using a heat shrinking insulating sleeve
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R9/00—Structural associations of a plurality of mutually-insulated electrical connecting elements, e.g. terminal strips or terminal blocks; Terminals or binding posts mounted upon a base or in a case; Bases therefor
    • H01R9/03—Connectors arranged to contact a plurality of the conductors of a multiconductor cable, e.g. tapping connections
    • H01R9/031—Connectors arranged to contact a plurality of the conductors of a multiconductor cable, e.g. tapping connections for multiphase cables, e.g. with contact members penetrating insulation of a plurality of conductors

Definitions

  • a safety device is described, arranged for short-circuiting potentially electrically conducting conductors of different polarities or phases arranged in one or more electrical cables.
  • a method of securing a collection of potentially electrically conducting conduc- 5 tors of different polarities or phases arranged in one or more electrical cables is described as well.
  • a known means of preventing a cable, for example an underground cable which is to carry power to a road-lighting system under construction, from possibly becoming energized, is short-circuiting the phase conductors so that the fuse of the respective circuit in the supply plant will clear if an attempt is made to apply current to the circuit not fully connected. It is known to short-circuit phase conductors in a multiwire cable
  • cable shorting-link which is formed of a circular metal plate with several metal pins that are attached perpendicularly to the plate by welding, and in which the pins are knocked into an end face of the cable. It has turned out to be particularly difficult to short-circuit thin cables in this way because of the lack of rigidity of the cable.
  • the invention provides a safety device for the end of a multiwire cable or a bundle of several single-core cables, in which a sleeve which is formed from an electrically conductive material is provided with several bores arranged substantially radially, at least one bore for every conductor.
  • the bores are arranged to receive elongated, axially displaceable and electrically conductive elements, typically screws, which can be forced through the insulating sheathing of the cable and into the adjacent conductor.
  • the radial cross section of the sleeve wall in an axial plane and the radial cross section of said elements, too, must be large enough to stand the relevant amperage for which the circuit, and thereby the respective fuse, have been dimensioned.
  • the sleeve and the elongated, axially displaceable and electrically conductive elements are preferably formed from materials that give low galvanic potential, to prevent corrosion from destroying the safety device in long-term use.
  • a fluid-sealing shrink cap may mould to the periphery of the safety device and extend beyond the safety device onto the sheath surface of the cable. Thereby it will be impossible to pull the shrink cap off the cable end.
  • a fitted safety device When the safety device is used on high-voltage cables, either a collection of several single-core conductors or a single single-core conductor, a fitted safety device will, first and foremost, be a mark of the high-voltage cable being non-energized.
  • the safety device it is practical to provide the safety device with an earthing connection, that is to say a conductor that may connect the sleeve to earth.
  • the invention relates more specifically to a safety device arranged for short-circuiting electrical conductors of different polarities or phases arranged in one or more potentially electrically conducting cables, characterized by an electrically conductive sleeve, with an internal cross section large enough to surround a multiwire cable or a collection of one or more single-core cables, being provided with several elongated, axially displaceable and electrically conductive elements that are arranged in bores extending through a sleeve wall, and the elongated, axially displaceable and electrically conductive elements being provided with end portions which are arranged to penetrate an insulation layer surrounding the respective, adjacent electrical conductor and into said conductor.
  • the sleeve may be tubular with a circular or polygonal cross section.
  • the spacing of the bores on the periphery of the sleeve substantially corresponds to the positioning of the electrical conductors relative to each other.
  • the elongated, axially displaceable and electrically conductive elements may be evenly distributed in a row around the periphery of the sleeve.
  • the elongated, axially displaceable and electrically conductive elements may be evenly distributed in at least two rows around the periphery of the sleeve, an elongated, axially displaceable and electrically conductive element in each row being arranged in a common plane extending in the direction of the centre axis of the sleeve.
  • a sleeve wall and the one or more elongated, axially displaceable and electrically conductive elements that is/are in contact with a conductor have a radial cross section that provides a sufficiently large power-conducting capacity to stand the relevant amperage that may arise in a short-circuiting after voltage has been applied to one or more of the conductors.
  • the sleeve may be provided with an earthing wire.
  • the sleeve, the elongated, axially displaceable and electrically conductive elements and the conductors are formed from materials with little difference in galvanic potential.
  • the elongated, axially displaceable and electrically conductive elements may be screws, and the bores may be threaded.
  • the invention relates more specifically to a method of securing a collection of potentially electrically conducting conductors of different polarities or phases arranged in one or more electrical cables, characterized by the method comprising the steps of:
  • the method may include the further step of:
  • the method may include the further step of:
  • the method may include the further step of:
  • Figure 1 shows a safety device according to the invention in perspective
  • Figure 2 shows an end view of the assembly of the safety device and a cable end
  • Figure 3 shows, in perspective, a cable end provided with a safety device with two rows of screws, some screws of which have been screwed into the cable;
  • Figure 4 shows an end view of a variant of the safety device holding together and short-circuiting a collection of single-core cables and being provided with a separate earthing wire
  • Figure 5 shows an end view of a variant of a polygonal safety device holding together and short-circuiting a collection of single-core cables, corresponding to what is shown in figure 4;
  • Figure 6 shows, in perspective, an end portion of a multiwire cable secured with the safety device according to the invention and protected with a sealing shrink cap.
  • the reference numeral 1 indicates a safety device formed of an electrically conductive sleeve 11 in which, from a jacket surface 111, several bores 113 extend through a sleeve wall 112.
  • an elongated, electrically conductive element 121 is arranged, preferably in the form of a 5 screw that is in engagement with threads in the bore 113.
  • the sleeve 11 is
  • FIG. 1 shows a safety device 1 short-circuiting a four-core cable 2 by the screws 121 being in electrically conductive contact with each of the conductors 21a, 21b, 21c, 21d of the multiwire cable 2.
  • the bores 113 are arranged radially with an angular distance of 90 degrees.
  • the safety device 1 is provided with screws 121 arranged in two screw 15 rows 12a, 12b. This may be useful to achieve a sufficient cross-sectional area in the electrically conductive connection between a conductor 21a, 21b, 21c, 21d and the sleeve 11.
  • an alternative embodiment of the safety device 1 includes a sleeve 11 with a circular cross section which surrounds a portion of
  • the single-core cables 2a, 2b, 2c are typically high-voltage
  • the safety device 1 is used primarily as a marking of a necessary check having been carried out on the cables having been made non- energized and secured at the supply end prior to the work that produces uncovered conductors 21a, 21b, 21c at the ends of the cables 2a, 2b, 2c.
  • Figure 5 shows a further embodiment of the safety device 1 which includes a polygo- nal sleeve 11 which, here, surrounds a portion of a collection of three single-core cables 2a, 2b, 2c corresponding to what is shown in figure 4.
  • Figure 6 shows an end of a cable 2 secured with a safety device 1 according to figure 1 and protected by a shrink cap 3 extending beyond the safety device 1 onto the insulating sheath 22 of the cable 2, on which it fits tightly and prevents any ingress of moisture to the conductor(s) (not shown in figure 6) of the cable 2.
  • the safety device 1 prevents the shrink cap 3 from being pulled off the cable 2.
  • the electrically conductive materials of the safety device 1 are selected from a group of metals with little difference in galvanic potential while, at the same time, both the screws 121 and the sleeve 11 have good conductivity and sufficiently large conductive cross sections to stand the relevant amperage that may arise in a short-circuiting after voltage has erroneously been applied to one or more of the conductors 21a, 21b, 21c, 21d.
  • the safety device 1 may form a supporting surface for a system for marking the cable end, for example with information about the cable having been secured and also information about which junction point the cable is connected to.
  • An advantage of the safety device 1 according to the invention is that it is easy to measure whether the short-circuiting has been carried out, by the very fact of the end portion of the relevant conductor 21a, 21b, 21c, 21d being easily accessible at the end of the sleeve 11 for the connection of measuring equipment, and measuring takes place by checking whether there is electrically conductive connection between the conductor 21a, 21b, 21c, 21d and the sleeve 11, with a so-called multimeter, for example.

Landscapes

  • Installation Of Indoor Wiring (AREA)
  • Installation Of Bus-Bars (AREA)
  • Coupling Device And Connection With Printed Circuit (AREA)
  • Cable Accessories (AREA)

Abstract

A method of securing a collection of potentially electrically conducting conductors (21a, 21b, 21c, 21d) of different polarities or phases arranged in one or more electrical cables (2; 2a, 2b, 2c) is described. A safety device (1) for use when practising the method is described as well.

Description

SAFETY DEVICE FOR ELECTRIC POWER CABLE END
A safety device is described, arranged for short-circuiting potentially electrically conducting conductors of different polarities or phases arranged in one or more electrical cables. A method of securing a collection of potentially electrically conducting conduc- 5 tors of different polarities or phases arranged in one or more electrical cables is described as well.
In installations for distributing electrical energy, there will be a risk that cables may unintendedly be live without this being indicated on a free cable end . This may have fatal consequences, and a great deal of resources is used to prevent such conditions i o from arising. In other situations, especially in a high-voltage installation in which a high-voltage cable is run into a coupling plant, a transformer station or the like, without the high-voltage cable being terminated immediately, there is a need to mark the cable as being without voltage by connecting a so-called personal protective grounding to the cable.
15 A known means of preventing a cable, for example an underground cable which is to carry power to a road-lighting system under construction, from possibly becoming energized, is short-circuiting the phase conductors so that the fuse of the respective circuit in the supply plant will clear if an attempt is made to apply current to the circuit not fully connected. It is known to short-circuit phase conductors in a multiwire cable
20 by means of a so-called cable shorting-link, which is formed of a circular metal plate with several metal pins that are attached perpendicularly to the plate by welding, and in which the pins are knocked into an end face of the cable. It has turned out to be particularly difficult to short-circuit thin cables in this way because of the lack of rigidity of the cable.
25 In addition, it is important to prevent moisture from penetrating into electrical cables through open ends exposed to the weather. For this, as a rule, cold- or heat-shrink end caps are used, for example 3M® Cold Shrink EC end caps. The invention has for its object to remedy or reduce at least one of the drawbacks of the prior art or at least provide a useful alternative to the prior art.
The object is achieved through the features that are specified in the description below and in the claims that follow.
The invention provides a safety device for the end of a multiwire cable or a bundle of several single-core cables, in which a sleeve which is formed from an electrically conductive material is provided with several bores arranged substantially radially, at least one bore for every conductor. The bores are arranged to receive elongated, axially displaceable and electrically conductive elements, typically screws, which can be forced through the insulating sheathing of the cable and into the adjacent conductor. The radial cross section of the sleeve wall in an axial plane and the radial cross section of said elements, too, must be large enough to stand the relevant amperage for which the circuit, and thereby the respective fuse, have been dimensioned.
The sleeve and the elongated, axially displaceable and electrically conductive elements are preferably formed from materials that give low galvanic potential, to prevent corrosion from destroying the safety device in long-term use.
When a multiwire cable is short-circuited with the safety device according to the invention, a fluid-sealing shrink cap may mould to the periphery of the safety device and extend beyond the safety device onto the sheath surface of the cable. Thereby it will be impossible to pull the shrink cap off the cable end.
When the safety device is used on high-voltage cables, either a collection of several single-core conductors or a single single-core conductor, a fitted safety device will, first and foremost, be a mark of the high-voltage cable being non-energized. For this purpose, it is practical to provide the safety device with an earthing connection, that is to say a conductor that may connect the sleeve to earth.
The invention is defined by the independent claims. The dependent claims define advantageous embodiments of the invention.
In a first aspect, the invention relates more specifically to a safety device arranged for short-circuiting electrical conductors of different polarities or phases arranged in one or more potentially electrically conducting cables, characterized by an electrically conductive sleeve, with an internal cross section large enough to surround a multiwire cable or a collection of one or more single-core cables, being provided with several elongated, axially displaceable and electrically conductive elements that are arranged in bores extending through a sleeve wall, and the elongated, axially displaceable and electrically conductive elements being provided with end portions which are arranged to penetrate an insulation layer surrounding the respective, adjacent electrical conductor and into said conductor.
The sleeve may be tubular with a circular or polygonal cross section.
Preferably, the spacing of the bores on the periphery of the sleeve substantially corresponds to the positioning of the electrical conductors relative to each other.
The elongated, axially displaceable and electrically conductive elements may be evenly distributed in a row around the periphery of the sleeve.
The elongated, axially displaceable and electrically conductive elements may be evenly distributed in at least two rows around the periphery of the sleeve, an elongated, axially displaceable and electrically conductive element in each row being arranged in a common plane extending in the direction of the centre axis of the sleeve.
Preferably, a sleeve wall and the one or more elongated, axially displaceable and electrically conductive elements that is/are in contact with a conductor have a radial cross section that provides a sufficiently large power-conducting capacity to stand the relevant amperage that may arise in a short-circuiting after voltage has been applied to one or more of the conductors.
The sleeve may be provided with an earthing wire.
Preferably, the sleeve, the elongated, axially displaceable and electrically conductive elements and the conductors are formed from materials with little difference in galvanic potential.
The elongated, axially displaceable and electrically conductive elements may be screws, and the bores may be threaded.
In a second aspect, the invention relates more specifically to a method of securing a collection of potentially electrically conducting conductors of different polarities or phases arranged in one or more electrical cables, characterized by the method comprising the steps of:
arranging an electrically conductive sleeve around an end portion of the collection of conductors,
short-circuiting the conductors by connecting each of the conductors to the sleeve by means of one or more elongated, axially displaceable and electrically con- ductive elements.
The method may include the further step of:
short-circuiting the conductors by screwing at least one screw through a sleeve wall and into each conductor.
The method may include the further step of:
earthing the sleeve by means of an earthing wire.
The method may include the further step of:
shielding a cable which includes the short-circuited conductors against ingress of moisture into the conductors by
arranging a shrink cap on the outside of the sleeve and an axially adjacent portion of a sheath surrounding the collection of conductors, and
bringing the shrink cap into sealing abutment against the sheath by shrinking.
In what follows, examples of preferred embodiments are described, which are illustrated in the accompanying drawings, in which :
Figure 1 shows a safety device according to the invention in perspective;
Figure 2 shows an end view of the assembly of the safety device and a cable end;
Figure 3 shows, in perspective, a cable end provided with a safety device with two rows of screws, some screws of which have been screwed into the cable;
Figure 4 shows an end view of a variant of the safety device holding together and short-circuiting a collection of single-core cables and being provided with a separate earthing wire; Figure 5 shows an end view of a variant of a polygonal safety device holding together and short-circuiting a collection of single-core cables, corresponding to what is shown in figure 4; and
Figure 6 shows, in perspective, an end portion of a multiwire cable secured with the safety device according to the invention and protected with a sealing shrink cap. Reference is first made to figure 1, in which the reference numeral 1 indicates a safety device formed of an electrically conductive sleeve 11 in which, from a jacket surface 111, several bores 113 extend through a sleeve wall 112. In each bore 113, an elongated, electrically conductive element 121 is arranged, preferably in the form of a 5 screw that is in engagement with threads in the bore 113. Here, the sleeve 11 is
shown as cylindrical, but other tubular shapes can be used as well, see figure 5, for example. The bores are evenly distributed on the periphery of the sleeve 11 at a pitch corresponding to the number of conductors to be short-circuited. Here, the bores 113 are arranged in one row 12a. The sleeve 11 has a radial wall cross section 112a. i o Figure 2 shows a safety device 1 short-circuiting a four-core cable 2 by the screws 121 being in electrically conductive contact with each of the conductors 21a, 21b, 21c, 21d of the multiwire cable 2. Here, the bores 113 are arranged radially with an angular distance of 90 degrees.
In figure 3, the safety device 1 is provided with screws 121 arranged in two screw 15 rows 12a, 12b. This may be useful to achieve a sufficient cross-sectional area in the electrically conductive connection between a conductor 21a, 21b, 21c, 21d and the sleeve 11.
In figure 3, several vacant bores 113 which are arranged to receive the elongated, electrically conductive elements 121 are shown as well. By placing a large number of 20 bores 113 over the periphery of the sleeve 11, it will always be possible to find bores 113 that lie directly opposite a conductor independently of whether the conductors are distributed regularly or irregularly over the cross section of the sleeve 11.
Reference is now made to figure 4, in which an alternative embodiment of the safety device 1 includes a sleeve 11 with a circular cross section which surrounds a portion of
25 a collection of three single-core cables 2a, 2b, 2c. Three corresponding screws 121 are arranged at an angular distance of 120 degrees around the sleeve 11 and connect the conductors 22 of the respective single-core cables 2a, 2b, 2c to the sleeve 11. An earthing wire 13 is fixed to the jacket surface 111 of the sleeve and is arranged to be connectable to earth 14. The single-core cables 2a, 2b, 2c are typically high-voltage
30 cables, and, in such situations, the safety device 1 is used primarily as a marking of a necessary check having been carried out on the cables having been made non- energized and secured at the supply end prior to the work that produces uncovered conductors 21a, 21b, 21c at the ends of the cables 2a, 2b, 2c.
Figure 5 shows a further embodiment of the safety device 1 which includes a polygo- nal sleeve 11 which, here, surrounds a portion of a collection of three single-core cables 2a, 2b, 2c corresponding to what is shown in figure 4.
Figure 6 shows an end of a cable 2 secured with a safety device 1 according to figure 1 and protected by a shrink cap 3 extending beyond the safety device 1 onto the insulating sheath 22 of the cable 2, on which it fits tightly and prevents any ingress of moisture to the conductor(s) (not shown in figure 6) of the cable 2. In addition to short-circuiting the conductors, the safety device 1 prevents the shrink cap 3 from being pulled off the cable 2.
To avoid galvanic corrosion, it is advantageous if the electrically conductive materials of the safety device 1 are selected from a group of metals with little difference in galvanic potential while, at the same time, both the screws 121 and the sleeve 11 have good conductivity and sufficiently large conductive cross sections to stand the relevant amperage that may arise in a short-circuiting after voltage has erroneously been applied to one or more of the conductors 21a, 21b, 21c, 21d.
The safety device 1 may form a supporting surface for a system for marking the cable end, for example with information about the cable having been secured and also information about which junction point the cable is connected to.
An advantage of the safety device 1 according to the invention is that it is easy to measure whether the short-circuiting has been carried out, by the very fact of the end portion of the relevant conductor 21a, 21b, 21c, 21d being easily accessible at the end of the sleeve 11 for the connection of measuring equipment, and measuring takes place by checking whether there is electrically conductive connection between the conductor 21a, 21b, 21c, 21d and the sleeve 11, with a so-called multimeter, for example.
It should be noted that all the above-mentioned embodiments illustrate the invention, but do not limit it, and persons skilled in the art may construct many alternative embodiments without departing from the scope of the attached claims. In the claims, reference numbers in brackets are not to be regarded as restrictive.
The use of the verb "to comprise" and its different forms does not exclude the presence of elements or steps that are not mentioned in the claims. The indefinite article "a" or "an" before an element does not exclude the presence of several such elements.
The fact that some features are indicated in mutually different dependent claims does not indicate that a combination of these features cannot be used with advantage.

Claims

C l a i m s
1. A safety device (1) arranged for short-circuiting electrical conductors (21a, 21b, 21c, 21d) of different polarities or phases arranged in one or more potentially electrically conducting cables (2; 2a, 2b, 2c), c h a r a c t e r i z e d i n that an electrically conductive sleeve (11) with an internal cross section large enough to surround a multiwire cable (2) or a collection of one or more single-core cables (2a, 2b, 2c) is provided with several elongated, axially displaceable and electrically conductive elements (121) which are arranged in bores (113) extending through a sleeve wall
(112) , and the elongated, axially displaceable and electrically conductive elements (121) are provided with end portions (122) which are arranged to penetrate an insulation layer (22) surrounding the respective, adjacent electrical conductor (21a, 21b, 21c, 21d) and into said conductor (21a, 21b, 21c, 21d).
2. The safety device (1) according to claim 1, wherein the sleeve (11) is tubular with a circular or polygonal cross section.
3. The safety device (1) according to claim 1, wherein the spacing of the bores
(113) on the sleeve (1) substantially corresponds to the positioning of the electrical conductors (21a, 21b, 21c, 21d) relative to each other.
4. The safety device (1) according to claim 1, wherein the elongated, axially displaceable and electrically conductive elements (121) are evenly distributed in one row (12a) around the periphery of the sleeve (11).
5. The safety device (1) according to claim 1, wherein the elongated, axially displaceable and electrically conductive elements (121) are evenly distributed in at least two rows (12a, 12b) around the periphery of the sleeve (11), an elongated, axially displaceable and electrically conductive element (121) of each row (12a, 12b) being arranged in a common plane that extends in the centre-axis direction of the sleeve (11).
6. The safety device (1) according to claim 1, wherein a sleeve wall (112) and the elongated, axially displaceable and electrically conductive element(s) (121) that is/are in contact with a conductor (21a, 21b, 21c, 21d) have radial cross sections (112a) that provide a sufficiently large power-conducting capacity to stand the relevant amperage that may arise in a short-circuiting after voltage has been applied to one or more of the conductors (21a, 21b, 21c, 21d).
7. The safety device (1) according to claim 1, wherein the sleeve 11 is provided with an earthing wire (13).
8. The safety device (1) according to claim 1, in which the sleeve (11), the elongated, axially displaceable and electrically conductive elements (121) and the conductors (21a, 21b, 21c, 21d) are formed from materials with little difference in galvanic potential.
9. The safety device (1) according to claim 1, wherein the elongated, axially displaceable and electrically conductive elements (121) are screws, and the bores (113) are threaded.
10. A method of securing a collection of potentially electrically conducting conductors (21a, 21b, 21c, 21d) of different polarities or phases arranged in one or more electrical cables (2; 2a, 2b, 2c), c h a r a c t e r i z e d i n that the method comprises the steps of:
arranging an electrically conductive sleeve (11) around an end portion of the collection of conductors (21a, 21b, 21c, 21d);
short-circuiting the conductors (21a, 21b, 21c, 21d) by connecting each of the conductors (21a, 21b, 21c, 21d) to the sleeve (11) by means of one or more elongated, axially displaceable and electrically conductive elements (121).
11. The method according to claim 11, wherein the method includes the further step of:
short-circuiting the conductors (21a, 21b, 21c, 21d) by screwing at least one screw (121) through a sleeve wall (112) and into each conductor (21a, 21b, 21c, 21d).
12. The method according to claim 10, wherein the method includes the further step of:
earthing the sleeve (11) by means of an earthing wire (13).
13. The method according to claim 10, wherein the method includes the further step of:
shielding a cable (2) which includes the short-circuited conductors (21a, 21b, 21c, 21d) against ingress of moisture into the conductors (21a, 21b, 21c, 21d) by
arranging a shrink cap (3) on the outside of the sleeve (11) and an axially adjacent portion of a sheath (22) surrounding the collection of conductors (21a, 21b, 21c, 21d), and
- bringing the shrink cap (3) into sealing abutment against the sheath (22) by shrinking.
PCT/NO2017/050327 2016-12-27 2017-12-14 Safety device for electric power cable end WO2018124883A1 (en)

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NO20162065A NO343038B1 (en) 2016-12-27 2016-12-27 Power wiring harness

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FR3127853A1 (en) * 2021-10-05 2023-04-07 Upeca System and method for shorting a cable

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NO20162065A1 (en) 2018-06-28

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