NL2022791B1

NL2022791B1 - Short-circuiting device

Info

Publication number: NL2022791B1
Application number: NL2022791A
Authority: NL
Inventors: Cornelis Jozef Van Der Poel Joannes; Valk Alfred
Original assignee: Batenburg Energietechniek B V
Priority date: 2019-03-22
Filing date: 2019-03-22
Publication date: 2020-10-02
Also published as: EP3713017C0; EP3713017A1; PL3713017T3; EP3713017B1

Abstract

Short-circuiting device for short-circuiting cores of a voltage cable relative to each other, with the feature that the short-circuiting device comprises an electrically conductive ring, wherein the short- circuiting device is provided with at least two releasable ring parts which can be arranged round cores of the voltage cable, wherein in mounted state the ring parts are configured to connect the cores in electrically conductive manner to the electrically conductive ring.

Description

SHORT-CIRCUITING DEVICE The invention relates to a short-circuiting device for (electrically) short-circuiting cores of a voltage cable relative to each other.

The invention is likewise related to a method for (electrically) short-circuiting cores of a voltage cable relative to each other. Such a device and method are generally known. It is known to use particularly four-core (low) voltage cables in a distribution network in order to distribute electricity from an electrical substation to one or more consumers. When making repairs to a voltage cable, the voltage cable is shut off and earthed on the side of a network operator in the electrical substation. Electricity can however still flow back into the network over the voltage cable on the side of the consumer, which can result in life-threatening situations when carrying out repair work on the voltage cable.

i5 International patent publication WO 2018/124883 A1 describes a method of securing a collection of potentially electrically conducting conductors of different polarities or phases arranged in one or more electrical cables. A safety device for use when practicing the method is described as well.

Patent publication NL 6 603 907 A describes a tapping connector for a multi-core cable comprising a radially divided ring of insulating material for receiving the insulated and continuous cable cores, wherein contact screws are radially arranged.

The invention has for its object to provide a short-circuiting device with which such repair work can be performed safely and efficiently.

A short-circuiting device of the type stated in the preamble according to the invention has for this purpose the special feature that the short-circuiting device comprises an electrically conductive ring, wherein the short-circuiting device is provided with at least two releasable ring parts which can be arranged round cores of the voltage cable, wherein in mounted state the ring parts are configured to connect the cores in electrically conductive manner to the electrically conductive ring. The cores are thus (electrically) short-circuited in safe manner so that particularly repair work on the voltage cable can take place safely. Forces which may be released in short-circuiting can be absorbed efficiently by the annular form. The ring parts are preferably congruent and each comprise a groove for accommodating therein a corresponding part of the electrically conductive ring. In other words, the ring parts form ring halves with a groove which is (at least partially) open toward the inside and wherein the electrically conductive ring is received. The ring is preferably manufactured from aluminium.

It is noted that in the frame work of the present invention the term “releasable ring parts” should be understood as ring parts that may be separated at least partly from each other so as to enable the cores to enter inside the ring formed by the ring parts. For example, the ring parts may be hingeable around a hinge axis located at the circumference of the ring, so that the ring parts are movable around said hinge axis between an open position, wherein the cores may enter inside the ring, and a closed position, wherein the ring parts close the ring. Further, as an example, the ring parts may be mutually detachably, so that the ring parts as separate constructional elements can be assembled together to form said ring.

In a preferred embodiment of the short-circuiting device according to the invention the short- circuiting device comprises electrical conductors which can be moved from a rest position, in which the conductors are inserted through the electrically conductive ring, to an operative position in which the electrical conductors press on the cores and connect the cores in electrically conductive manner to the electrically conductive ring. The short-circuiting device preferably comprises a separate (removable) support which in mounted state is enclosed by the ring parts, wherein in the operative position the electrical conductors press the cores against the support and connect the cores in electrically conductive manner to the electrically conductive ring. The support comprises particularly a cross-shaped cross-section, wherein in the operative position the conductors are configured to press each of the four cores into a corresponding corner of the support.

In a further preferred embodiment of the short-circuiting device according to the invention the conductors are provided with screw thread for turning the conductors from the rest position to the operative position. This is preferably done manually. The screw thread of the conductors then co- acts with screw thread in walls of holes in the electrically conductive ring, through which the conductors are inserted.

In a further preferred embodiment of the short-circuiting device according to the invention each of the conductors is provided on its outer end directed toward the support with a press-through contact which can be pressed through core insulation of the cores using a separate tool. The separate tool is particularly a hex key.

As already indicated, the invention also relates to a method for short-circuiting cores of a voltage cable relative to each other, wherein a cable sheath of the voltage cable is removed locally so that the cores are exposed locally, wherein at least two releasable ring parts of a short-circuiting device are arranged round the exposed cores, and wherein the cores are connected in electrically conductive manner to an electrically conductive ring of the short-circuiting device. Use is preferably made here of electrical conductors which are moved from a rest position, in which the conductors are inserted through the electrically conductive ring, to an operative position in which the electrical conductors press the cores against a support and connect the cores in electrically conductive manner to the electrically conductive ring. Use is particularly made here of press- through contacts in the electrical conductors for locally pressing through core insulation of the cores. The press-through contacts are operated from the outside, for instance by a hex key. The invention will be further elucidated herein below with reference to figures shown in a drawing, wherein: - figures la-q show in stepwise manner repair works on a voltage cable using the short- circuiting device according to the invention; and - figure 2 shows a front view, a perspective view and an exploded view of a preferred variant of the short-circuiting device according to the invention.

Referring to figure 1, a low voltage cable which extends between an electrical substation (of an operator of an electricity network) and a consumer is dug up and its cable sheath is removed locally, so that four cores 1 covered with core insulation in blue, red and yellow colours become exposed. After it has been checked that the voltage cable has been shut off and earthed on the side of a network operator in the electrical substation (figure 1a) a separate, cross-shaped support 2 is mounted, wherein each core | runs through a corresponding quadrant of support 2 (figure 1b). Ring halves 3, 4 of a short-circuiting device 5 are then mounted round cores 1, wherein the separate support 2 is enclosed by the ring halves 3, 4 (figures c and d). As already elucidated, in mounted state the ring halves 3, 4 form a circumferential, internal groove 6 in which an aluminium ring 7 is arranged (figure 2). By manually tightening knobs 8 (figures le and 2) four electrical conductors 9 are screwed from outside to inside in order to press cores | in the direction of corners of cross-shaped support 2. A hex key 10 is then placed in each of the knobs 8 in order to tighten contact points 11 in conductors 9 in the direction of the corners of support 2 and then press them through the core insulation of cores 1 (figures 1f and 2). A short-circuiting connection between the cores 1 and the aluminium ring 7 is hereby realized (figure 1g). Electricity which may be flowing from the consumer back into the network is therefore no longer able to cause any damage, so that repair works can be performed safely (figures 1h and 1). Outer ends of the voltage cable can then be reconnected to each other using a terminal block 12 (figures 1j, k and I), after which ring halves 3, 4 can be removed from short-circuiting device 5 and support 2 (figures Im, n and o). Contact imprints of only several millimetres will subsequently still be visible (figure 1p). Finally, a so-called wrap-around cable joint 13 is manufactured in situ using moulding resin, wherein the contact imprints are covered up (figure 1q).

IO As stated, figure 2 shows the ring halves 3, 4 of short-circuiting device 5 in mounted state in a front view (figure 2a), in a perspective rear view (figure 2b) and in an exploded view (figure 2c), wherein corresponding parts are designated with the same reference numerals.

The invention is not limited to the drawn exemplary embodiment, but also extends to other preferred variants falling within the scope of the appended claims.

Claims

Conclusies i. Kortsluitinrichting (5) voor het onderling kortsluiten van aderen (1) van een spanningskabel met het kenmerk dat de kortsluitinrichting (5) een elektrisch geleidende 5 ring (7) omvat, waarbij de kortsluitinrichting (5) is voorzien van ten minste twee losneembare ringdelen (3, 4) die om aderen (1) van de spanningskabel kunnen worden aangebracht, waarbij de ringdelen (3, 4) in gemonteerde toestand zijn ingericht om de aderen (1) op elektrisch geleidende wijze te verbinden met de elektrisch geleidende ring (7).Conclusions i. Short-circuit device (5) for mutually short-circuiting the wires (1) of a power cable, characterized in that the short-circuit device (5) comprises an electrically conductive ring (7), the short-circuit device (5) being provided with at least two detachable ring parts ( 3, 4) which can be arranged around veins (1) of the power cable, wherein the ring parts (3, 4) in mounted condition are arranged to connect the veins (1) in an electrically conductive manner with the electrically conductive ring (7) .

2. Kortsluitinrichting (5) volgens conclusie 1, waarbij de ringdelen (3, 4) congruent zijn en elk een groef (6) omvatten voor het daarin opnemen van een corresponderend deel van de elektrisch geleidende ring (7).Shorting device (5) according to claim 1, wherein the ring parts (3, 4) are congruent and each comprise a groove (6) for receiving a corresponding part of the electrically conductive ring (7) therein.

3. Kortsluitinrichting (5) volgens conclusie 1 of 2, waarbij de kortsluitinrichting (5) elektrische geleiders (9) omvat die kunnen worden verplaatst vanuit een rustpositie, waarbij de geleiders {9) door de elektrisch geleidende rmg (7) zijn gestoken, naar een werkpositie, waarbij de elektrische geleiders (9) op de aderen (1) drukken en de aderen op elektrisch geleidende wijze verbinden met de elektrisch geleidende ring (7).Shorting device (5) according to claim 1 or 2, wherein the shorting device (5) comprises electrical conductors (9) that can be moved from a rest position, the conductors {9) being passed through the electrical conducting screen (7) to a working position, wherein the electrical conductors (9) press on the veins (1) and connect the veins in an electrically conductive manner to the electrical conductive ring (7).

4. Kortsluitinrichting (5) volgens conclusie 1, 2 of 3, waarbij de kortsluitinrichting (5) een steun (2) omvat die in gemonteerde toestand door de ringdelen (3, 4) wordt omsloten, en waarbij de elektrische geleiders (9) in de werkpositie de aderen (1) tegen de steun (2) drukken en de aderen (1) op elektrisch geleidende wijze verbinden met de elektrisch geleidende ring (7).Short-circuit device (5) according to claim 1, 2 or 3, wherein the short-circuit device (5) comprises a support (2) which is enclosed by the ring parts (3, 4) in mounted condition, and wherein the electrical conductors (9) the working position, press the veins (1) against the support (2) and connect the veins (1) in an electrically conductive manner with the electrically conductive ring (7).

5. Kortsluitinrichting (5) volgens conclusie 4, waarbij de steun (2) een kruisvormige dwarsdoorsnede omvat.Short-circuit device (5) according to claim 4, wherein the support (2) has a cross-shaped cross-section.

6. Kortsluitinrichting (5) volgens conclusie 4 of 5, waarbij, in de werkpositie, de geleiders (9) zijn ingericht om elk van de aderen (1) in een corresponderende hoek van de steun (2) te drukken.Shorting device (5) according to claim 4 or 5, wherein, in the working position, the conductors (9) are arranged to press each of the veins (1) into a corresponding angle of the support (2).

7. Kortsluitinrichting (5) volgens een van de voorgaande conclusies 3-6, waarbij de geleiders (9) zijn voorzien van schroefdraad voor het verplaatsen van de geleiders (9) van de rustpositie naar de werkpositie.Short-circuiting device (5) according to any of the preceding claims 3-6, wherein the guides (9) are provided with screw thread for moving the guides (9) from the rest position to the working position.

8. Kortsluitinrichting (5) volgens een van de voorgaande conclusies 3-7, waarbij elk van de geleiders (9) aan diens naar de steun (2) toegekeerde uiteinde is voorzien van een doordrukcontact (11) dat door aderisolatie van de aderen {1) kan worden gedrukt met gebruik van een afzonderlijk gereedschap.Short-circuiting device (5) according to any one of the preceding claims 3-7, wherein each of the conductors (9) at its end facing the support (2) is provided with a push-through contact (11) which passes through core insulation of the veins {1). ) can be printed using a separate tool.

9. Kortsluitinrichting {5) volgens conclusie 8, waarbij het afzonderlijke gereedschap een inbussleutel (10) is.Shorting device {5) according to claim 8, wherein the separate tool is an Allen key (10).

10. Werkwijze voor het onderling kortsluiten van aderen (1) van een spanningskabel, waarbij een kabelmantel van de spanningskabel lokaal wordt verwijderd, zodat de aderen (1) lokaal worden blootgelegd, waarbij ten minste twee losneembare ringdelen (3, 4) van een kortsluitinrichting (5) om de blootliggende aderen (1) worden aangebracht, waarbij de aderen (1) op elektrisch geleidende wijze worden verbonden met een elektrisch geleidende ring (7) van de kortshuitinrichting (5).10. Method for mutually short-circuiting the wires (1) of a power cable, in which a cable sheath of the power cable is locally removed so that the wires (1) are locally exposed, whereby at least two detachable ring parts (3, 4) of a shorting device (5) are arranged around the exposed veins (1), the veins (1) being electrically conductive connected to an electrically conductive ring (7) of the short circuit device (5).

11. Werkwijze volgens conclusie 10, waarbij gebruik wordt gemaakt van elektrische geleiders (9) die worden verplaatst vanuit een rustpositie, waarbij de geleiders (9) door de elektrisch geleidende ring (7) zijn gestoken, naar een werkpositie, waarbij de elektrische geleiders (9) op de aderen (1) drukken en de aderen (1) op elektrisch geleidende wijze verbinden met de elektrisch geleidende ring (7).A method according to claim 10, wherein use is made of electrical conductors (9) which are moved from a rest position, the conductors (9) being passed through the electrically conductive ring (7), to a working position, wherein the electrical conductors ( 9) Press on the veins (1) and connect the veins (1) in an electrically conductive manner with the electrically conductive ring (7).

12. Werkwijze volgens conclusie 11, waarbij gebruik wordt gemaakt van doordrukcontacten (11) in de elektrische geleiders (9) voor het lokaal door aderisolatie van de aderen (1) drukken.A method according to claim 11, wherein use is made of push-through contacts (11) in the electrical conductors (9) for locally pushing through core insulation of the veins (1).

13. Werkwijze volgens conclusie 12, waarbij de doordrukcontacten (11) van buitenaf bediend worden middels een inbussleutel (10).A method according to claim 12, wherein the push-through contacts (11) are operated from the outside by means of an Allen key (10).