WO2019161943A1

WO2019161943A1 - Lightning arrester device

Info

Publication number: WO2019161943A1
Application number: PCT/EP2018/075414
Authority: WO
Inventors: Martin Bischoff; Adam Santa; Olaf Schmidt
Original assignee: Obo Bettermann Hungary Kft
Priority date: 2018-02-26
Filing date: 2018-09-20
Publication date: 2019-08-29
Also published as: DE202018101038U1; SG11202006411PA; RU2020131514A; EP3721517A1

Abstract

The invention relates to a lightning arrester device consisting of a catching device (1) having an electrical conductor (2) which is connected to an earthing installation and which is surrounded by insulation (4) surrounded by a longitudinally continuous layer (5) made from a material which forms a conductive layer, wherein: a connecting cap (6) is positioned on the end region, facing the catching device (1), of the insulation (4) and of the layer (5) surrounding said insulation, by means of which connecting cap the catching device (1) and/or the electrical conductor (2) is connected to the layer (5); the connecting cap (6) is sleeve-shaped and is applied with the sleeve casing to the insulation (4) and to the layer (5) surrounding said insulation, and the sleeve base (7) of the connecting cap serves as an insertion limit for the insulation (4) and the layer (5); a blind hole (8), into which the stripped end of the conductor (2) is inserted, adjoins the sleeve base (7); and an interlocking part (10) is integrally formed inside the sleeve casing of the connecting cap (6) and is interlockingly connected to the insulation (4) in the desired assembly position, thereby deforming the insulation (4).

Description

Blitzstromableitvorrichtung

The invention relates to a

A lightning arresting device, comprising a catching device, with an electrical conductor connected to a grounding system, wherein the electrical conductor is surrounded by an insulation, wherein the insulation of a in

Longitudinally continuous layer of one

Material is surrounded, which forms a conductive layer, wherein on the end of the end piece of the insulation facing and the surrounding layer, a connection cap or the like component of electrically conductive material, in particular metal, is arranged, by means of which the catching device and / or the electrical conductor with the Layer is connected, and / or on the earthing system facing end of the insulation and the surrounding layer, a connection cap or the like component of electrically conductive

Material, in particular metal, is arranged, by means of which the electrical conductor and / or the earthing system is connected to the layer surrounding the insulation, wherein the connection cap is formed like a sleeve and with the

Sleeve sheath on the insulation along with the surrounding layer is aufgebacht and their

Sleeve bottom as Einsteckbegrenzung for the

Insulation including layer is used, with the

Sleeve bottom connects a blind hole, in which the stripped end of the conductor is inserted, preferably the threaded connection cap in the region of the blind hole of stud bolts

is penetrated, which contact with their projecting into the blind hole end of the stripped end of the conductor.

Such Blitzstro discharge device is known for example from EP 1 760 855 Bl. Similar to those known in the art

Lightning leakage devices is the

Connection cap, which is sleeve-like, provided on the inside with a slightly protruding thread, so that the connection cap on the

electrical conductor including insulation and velvet continuous layer can be applied by threading. In fact, the thread penetrates something in the continuous layer, the one

Conductive layer forms, to produce an electrical contact here. As a result, however, no mechanical fixation is achieved because this threaded connection is not sufficient to a high-tensile connection between the catcher and the multi-component cable to

to reach. To a tensile bond to

reach, the arrangement of the stud bolts is used in the prior art, which in the

Mounting setpoint penetrate into the material of the stripped conductor and intervene. to

Securing the position of these studs must be secured by means of a suitable adhesive in the desired position, otherwise there is a risk that these screws come loose when a

Lightning current event occurs, so then the necessary tension-resistant connection, which is to be achieved alone on the studs, is no longer guaranteed.

The current standard (IEC 62561-1 2017) stipulates that the connection must withstand a tensile force of 900 N +/- 20 N for one minute, whereby the mobility should be less than one millimeter.

To achieve this is not or not sufficiently with the conventional technique

ensured.

Based on this prior art, the invention has the object, a

Blitzstromableitvorrichtung generic type to create, with a simple structural design, easy handling and possible while avoiding adhesive or the like a high

Current carrying capacity ensures, while

In particular, the new standards should be respected.

To solve this problem in principle, the invention proposes that at least one form-fitting part is formed on the inside of the sleeve sheath of the connection cap, which is positively connected to the insulation in assembly target position with deformation of the insulation.

According to this embodiment, a tensile strength

Connection of the corresponding elements

ensured and also an electrical contact, wherein the form-fitting part penetrates radially in the mounting target position in the material of the insulation and thus leads to a corresponding deformation, whereby a positive connection between the connection cap and the insulation is achieved. For this purpose, a form-fitting part may be sufficient, which engages correspondingly deep in the insulation. However, it is also possible for a plurality of form-fitting parts to be formed axially one behind the other in the connection cap, in which case they do not have to penetrate so deeply into the insulation in order to ensure positive engagement. By this configuration is the usual

Bonding of the studs superfluous, as they are for the tensile connection meaningless.

With such an embodiment, a tensile force of 900 N +/- 20 N is achieved according to the standard, which can be maintained even over a minute and ensures a mobility of less than one millimeter. By this configuration, a higher current carrying capacity is achieved because no mobility in the axial direction is possible because of the positive connection between the

Connection cap and the insulating material (the

Isolation) prevents this.

Preferably, it is provided that the

Forming part keeps the layer pressed into the deformation of the insulation.

According to this embodiment, the device is designed so that by the form-fitting part, if it is in assembly target position a deformation of the

Insulation causes and in this form-fitting intervenes, also the additional layer, which the Conductive layer forms, is taken along and is pressed into the deformation of the insulation with. Preferably, therefore, the layer which forms the conductive layer is not severed by the form-fitting part by the mold-closing part, but the layer is squeezed and formed into a recess or recess formed by the mold-closing part

Like the insulating material of the insulation pressed.

It is also preferably provided that the

Forming part by at least one

Thread forming rib is formed, which protrudes from the inside of the sleeve sheath of the connection cap.

For example, a thread sufficient to form a relatively far projecting from the sleeve shell rib. If several threads are provided, which forms correspondingly protruding ribs, the ribs do not have to protrude so far, in order nevertheless to achieve and ensure the positive connection between the connection cap and the insulation.

Preferably, it is also provided that the

Forming part has an inner diameter which is smaller than the diameter of the insulation and larger than the diameter or the

Transverse dimension of the electrical conductor.

Preferably, the form-fitting part penetrates into the assembly target position over a part of the thickness of the insulation in this. In particular, in a thread-like design of the form-fitting part the Actuation of the connection cap for the purpose of

To ensure unscrewing is at the

Connection cap provided an array of key surfaces or the like, so that the

Connection cap by means of a suitable tool, such as a wrench, is rotatable into the desired position when they are on the

Initial region of the cable formed from the many components is postponed.

In order to achieve a simple handling it is provided that the sleeve-like connection cap in the area seen axially before and / or behind the

Forming part has a diameter which is less than or equal to or as the transverse dimension or the diameter of the electrical conductor including insulation and together with the continuous layer, but greater than or equal to

or as the transverse dimension or the diameter of the electrical conductor together

Insulation.

This can be during assembly first of the

electrical conductors including insulation and the

continuous layer in the sleeve-like

Connection cap are inserted before then the further attachment process is performed, which is powerful, in which the positive connection

between the parts is made.

For the same reason it is provided that the form-fitting part is formed at a distance from the mouth end of the connection cap, wherein the distance is preferably greater than the axial extent of the Formschlussteiles is or about one-third of the length between the mouth and the bottom of the sleeve

Connection cap corresponds.

In particular, it can also be provided that the insulation consists of hard material, preferably VPE.

In addition, it can be provided that the layer surrounding the insulation consists of elastic material, preferably electrically conductive VPE or EVA.

It can also be provided that the layer is multi-layered.

In a manner known per se, it is provided that the electrical conductor is surrounded by a semiconducting layer or a semiconductive jacket, wherein the conductor is formed from a plurality of wires.

Advantageously, the insulation may be surrounded by a material having a polymeric matrix and a particulate filler comprising zinc oxide powder, in particular doped zinc oxide varistor powder.

The conductive layer may be a layer having nonlinear electrical behavior. It can have the following properties.

The material shows a strong voltage-dependent resistance, which decreases with increasing field strength in a non-linear manner. In the normal state, this works non-linear

electrical material as insulator. In the case of a lightning strike, the material almost acts as the high electric field strength

low-resistance electrical conductor. The thus adjusting non-linear conductivity

ensures that in case of contact with or retention of the lead with a grounded metallic object, no sliding discharges are formed.

A cable termination is omitted in such a solution. It is merely a connection of the non-linear electrical coating to the

electrical conductor and the catcher or to the grounding system by means of the catching device required. The effect here is the effect that due to the non-linearity of the wrapping material the

Conductivity intrinsic to that

High voltage connection decreases. This achieves a steady degradation of critical field strengths.

Advantageous materials and embodiments, which can also be applied to the subject invention, are specified in EP 1 760 855 Bl in the claims 3 to 13 there. All these features are also for the present

Blitzstromableitvorrichtung used and

advantageous. An embodiment of the invention is illustrated in the drawing and closer in the following

described.

It shows

Figure 1 is an exploded view of

Items of the

Blit zstromableitvorrichtung;

Figure 2 is a similar view in another direction;

Figure 3 is a detail in view

As seen in Figure 1;

FIG. 4 shows a detail in FIG

Seen mid-longitudinal.

In the drawing, a Blitzstromableitvorrichtung is shown, which consists of a catching device 1, which is connected via an electrical conductor 2 to a grounding system, not shown. The

electrical conductor 2 is surrounded by an insulation 4, wherein the insulation 4 of a in

Longitudinally continuous layer 5 of a

Material is surrounded, which forms a conductive layer.

In Figure 1 to 3, the layer 5 is not guided to the end of the insulation 4 to make the arrangement of these layers clear. In practice, the layer 5 reaches the end of the insulation 4. At the end of the insulation 4 facing the catcher 1 and the surrounding layer 5 is a connection cap 6 of electrically conductive material, in particular metal, arranged by means of which the catcher 1 and the electrical conductor 2 is connected to the layer 5. Also on a grounding system facing end of the

Insulation 4 and the surrounding layer 5, such a cap 6 can be installed.

Hereby can then the electrical conductor 2 and the grounding system with the insulation 4 surrounding layer 5 are connected.

The connecting cap 6 is, as shown in particular in Figure 2, sleeve-like design and in the assembly target position with the sleeve casing on the

Insulation 4 applied together with this surrounding layer 5. The sleeve bottom 7 can as

Insertion limit for the insulation 4 together with layer 5 serve. To the sleeve bottom 7 includes a blind hole 8, in which the stripped end of the conductor 2 is inserted in contact, when the cable is prepared as shown in Figure 1 to 3. In the exemplary embodiment, the connection cap 6 in the region of the blind hole 8 radial threaded holes 9 'for stud bolts 9, with their in the

Blind end 8 contact the stripped end of the conductor 2. The blind hole has a smaller diameter than the terminal cap 6, so that the stripped end of the conductor 2 is fittingly inserted.

On the inside of the sleeve jacket of the connection cap 6, at least one form-fitting part 10 is integrally formed or attached in another way, which in

Assembly target position under deformation of the insulation 4 leads to a positive connection between junction cap 6 and insulation 4. Depending on how far the form-fitting part 10 projects radially into the sleeve or depending on how many such form-fitting parts 10 are provided, the penetration depth of the

Form closing parts 10 in the insulation 4 more or less deep. A form fit in

Sufficient degree is ensured in each case to ensure a corresponding tensile force transmission and thus a higher current carrying capacity.

By the form-fitting part 10 is in the

Assembly target position at the same time the layer 5 is pressed into the deformation of the insulation 4, preferably without the layer 5 is severed to ensure the electrical function.

As shown for example in FIG

Forming part 10 may be formed by a thread forming rib, which projects from the inside of the sleeve sheath of the connection cap 6. In this case, the form-fitting part 10 preferably has one

Inside diameter smaller than that

Diameter of the insulation 4, but larger than the diameter or the transverse dimension of the electrical conductor 2. In the exemplary embodiment, the

sleeve-like connection cap 6 in the range seen axially, before and behind the form-fitting part 10 has a larger diameter, which is smaller than or equal to or as the transverse dimension or the diameter of the electrical conductor 2 together

Insulation 4 and together with the continuous layer 5, but greater than or equal to or as the transverse dimension or the diameter of the

electrical conductor 2 with insulation 4.

In these areas with a larger diameter, in particular in the mouth region may be provided a slightly radially projecting thread-like formation, which can serve to cable together

Isolation 4 and layer 5 at the beginning of the

Assembly process in the connection cap

screw without already done a deformation of the insulation 4. After this pre-assembly then the connection cap 6 with a suitable

Tool, which at the key surfaces 12

attacks, overcoming by the

Forming part 10 formed resistance

be screwed, in which case the layer 5 together with insulation 4 is displaced radially inwards by the form-fitting part 10, so that a positive connection between the form-fitting part 10 and the insulation 4 is achieved. In particular, the form-fitting part 10 is formed at a distance from the mouth end of the connection cap 6, wherein this distance is preferably greater than the axial length of the form-fitting part 10 or can also correspond to about one-third of the length between the mouth and sleeve bottom 7 of the connection cap 6. These dimensions are not

mandatory, but can be beneficial.

The insulation 4 may be made of hard material,

For example, VPE exist. The layer 5, which surrounds the insulation 4, preferably consists of

elastic material, such as electrically conductive VPE or EVA. It should be noted that the layer 5 can not consist of a material layer, but also of several material layers.

Such material layers can be different

Have functions, for example, an outer layer of material can be UV-resistant to achieve the appropriate UV protection.

Also, the electrical conductor 2 may be surrounded by a semiconductive layer 11, as shown in Figure 1 to 3. In the drawing, the semiconductive layer 11 protrudes with respect to the insulation 4, but this is illustrated only for the sake of clarity. Normally, the insulation 4 with the semiconducting layer 11 is seen in the axial direction, complete.

This semiconducting layer serves as a smoothing layer designed to make the wires of the conductor 2 behave like a solid round conductor.

The invention is not limited to the embodiment but within the scope of what is disclosed in the claims and the description given.

All in the description and / or drawing

disclosed individual and combination features are considered essential to the invention.

Claims

Claims:

1. Lightning leakage device consisting of

a catching device (1) with a

electrical conductor (2), with a

Grounding system is connected, the

electrical conductor (2) is surrounded by an insulation (4), wherein the insulation (4) is surrounded by a longitudinally continuous layer (5) of a material which has a

Conductive layer forms, wherein at the

Catching device (1) facing end of the insulation (4) and the surrounding layer (5) a junction cap (6) or the like component of electrically conductive material, in particular metal, is arranged, by means of which the catching device (1) and / or the electrical Ladder (2) is connected to the layer (5), and / or on the

Earthing system facing end of the

Insulation (4) and the surrounding layer (5) a connection cap (6) or the like component of electrically conductive material, in particular metal, is arranged, by means of which the electrical conductor (2) and / or the grounding system with the insulation (4 ) is connected to surrounding layer (5), wherein the connection cap (6) is sleeve-like and with the sleeve jacket on the insulation (4) together with the surrounding layer (5)

is aufgeacht and whose sleeve bottom (7) serves as Einsteckbegrenzung for the insulation (4) together with layer (5), wherein the sleeve bottom (7) a blind hole (8) connects, in which the stripped end of the conductor (2) is inserted, wherein preferably the connection cap (6) in the region of the blind hole (8) of stud bolts (9) is threaded through, with its in the blind hole (8) projecting end of the stripped end of the conductor ( 2) contact, characterized in that on the inside of the sleeve sheath of the connection cap (6) at least one form-fitting part (10) is formed, which in assembly target position under deformation of

Insulation (4) is positively connected to the insulation (4).

2. Blitzstromableitvorrichtung according to claim 1, characterized in that the

Forming part (10) holds the layer (5) pressed into the deformation of the insulation (4).

3. Blitzstromableitvorrichtung according to claim 1 or 2, characterized in that the

Forming part (10) is formed by at least one thread forming rib, which projects from the inside of the sleeve sheath of the connection cap (6).

4. Lightning current discharge device according to one of

Claims 1 to 3, characterized in that the form-fitting part (10) has an inner diameter which is smaller than the diameter of the insulation (4) and larger than that

Diameter or the transverse dimension of the

electrical conductor (2).

5. Blitzstromableitvorrichtung according to one of claims 1 to 4, characterized in that the sleeve-like connection cap (6) in the area axially seen before and / or behind the

Forming part (10) has a diameter

has, which is smaller than or equal to or as or as the transverse dimension or the diameter of the

electrical conductor (2) together with insulation (4) and together with the continuous layer (5), but greater than or equal to or as the transverse dimension or the diameter of the

electrical conductor (2) with insulation (4).

6. Lightning current discharge device according to one of

Claims 1 to 5, characterized in that the form-fitting part (10) at a distance from

Muzzle end of the connection cap (6) is formed, wherein the distance is preferably greater than the axial extent of the Formschlussteile (10) or about one third of the length between the mouth and sleeve bottom (7) of

Connection cap (6) corresponds.

7. Lightning current discharge device according to one of

Claims 1 to 6, characterized in that the insulation (4) made of hard material, preferably VPE, consists.

8. Lightning current discharge device according to one of

Claims 1 to 7, characterized in that the layer (5) surrounding the insulation (4) made of elastic material, preferably

electrically conductive VPE or EVA.

9. Blitzstromableitvorrichtung according to any one of claims 1 to 8, characterized in that the layer (5) is multi-layered.

10. Lightning current discharge device according to one of

Claims 1 to 9, characterized in that the electrical conductor (2) of a

semiconductive layer (11) or a

is surrounded by a semiconductive jacket, wherein the

Ladder (2) is formed of several wires.