BE1025231B1 - Electrical protection system - Google Patents

Abstract

The invention relates to a fence system for protecting a site. The system comprises bars (11, 12, 13, 14), preferably vertical. Guides (21, 22, 23, 24, 31, 32, 33, 34) are attached to the bars (11, 12, 13, 14). They are arranged in anyone on each bar and so that two guides (21, 32) located at the same height on different bars (11, 12) are offset horizontally. Consequently, successive sections (51, 52) of electrical wire at different heights are, between the bars, in intersecting vertical planes. Thus, the sections touch when an intruder discards them to make a passage. As every other section is connected to a high voltage and the other to ground, their contact can be detected by a detection device.

Description

The present invention relates to a fence system for protecting a site with a specific perimeter against an intrusion.

PRIOR ART [0002] The Belgian patent having the publication number BE1013918 and the filing number BE2001 / 0035 discloses a fence system for protecting a site with a defined perimeter against an intrusion. A problem with this known system is that it is complex to manufacture and expensive.

In addition, its installation is delicate and takes a long time. In addition, it is very visible, which encourages intruders to take precautions to cross it.

SUMMARY OF THE INVENTION [0003] An object of the present invention is to provide a protective fence system that is easy to manufacture, inexpensive, unobtrusive and quick to install.

To this end, the invention proposes a fence system for protecting a site with a specific perimeter against an intrusion, comprising:

"An electric generator, ® a first bar capable of being arranged the leng of the perimeter in an at least partially vertical direction," a first upper guide mechanically coupled to the first bar, "a first lower guide mechanically coupled to the first bar and offset relative to the first upper guide along the first bar,

B E2017 / 5361 ® a second bar capable of being arranged ie along the perimeter in an at least partially vertical direction and spaced from the first bar ie along the perimeter, "a second upper guide mechanically coupled to the second bar, ® a second guide lower mechanically coupled to the second bar and shifts relative to the second upper guide ie along the second bar, a first section of electric fence wire electrically connected to the electric generator and arranged so as to be guided by the first upper guide and ie second upper guide, ® a second section of electric fence wire arranged so as to be guided by the first lower guide and the second lower guide, characterized in that * the first and second bars are made of an electrical insulating material, * the system is arranged so that the second section is at an electrical potential different from that of the first section, ® ie the first upper guide is arranged in a first direction relative to the first bar, ® the first lower guide is arranged in a second direction relative to the first bar, the second direction being essentially opposite to the first direction, ® the second upper guide is arranged in the second direction relative to the second bar, ® the second lower guide is arranged in the first direction relative to the second bar, and

B E2017 / 5361 “H further comprises a detection device arranged to detect an electrical contact between the first section and the second [0005] The position of the guides in the system according to the invention is such that the first section of wire and the second section of wire are not parallel: if we look at the above system, we see that the vertical plane comprising the first section of wire crosses the vertical plane comprising the second section of wire between the first and second bars. In fact, at the level of the first bar the first section is on the first side of the bars and at the level of the second bar, the first section is on the second side of the bars, while the second section is on the second side: bars level of the first bar and the first side of the bars at the level of the second bar. Consequently, if an intruder seeks to pass the closing system by bringing the first and second sections closer together, these touch each other, which creates an electrical contact between them which is detected by the detection device.

The system according to the invention is particularly easy to manufacture and inexpensive because it requires only insulating bars, guides which can be very simple, electric wire, a generator and a detection device.

It is also particularly discreet because it does not require an insulator to isolate the sections of wire because the insulation between the wires is provided by the bars.

It is also particularly quick to install, in particular because it does not require having a stop at a determined distance from the sections of wire.

The guides are intended to mechanically couple the sections to the bars and to guide them. Preferably, each guide is such that the section and bar that it couples are essentially perpendicular to each other. Guides can be called clips or ’’ ecoclips. Of

B E2017 / 5361 preferably, your guides are self-locking on the bars. Preferably, your guides are made of stainless steel. Preferably, your guides are placed at regular intervals on the bars.

Preferably, the system is arranged so that each section is approximately horizontal. Thus, the first upper guide is preferably approximately the same height as the second upper guide and the first lower guide is preferably approximately the same height as the second lower guide.

In one embodiment of the invention, the first and second directions are essentially in a direction perpendicular to a direction joining the first and the second bars.

In one embodiment, in a first direction means towards an interior of the site protected by the system and in a second direction means towards an exterior of the site protected by the system. The first and second directions preferably have a horizontal component. The first and second senses are antiparallel to each other.

Preferably, the first and the second bars are straight. Preferably, the first and second bars are parallel. Preferably, the first and second bars are rigid.

In the context of this document, the first side ”of the bars is located in the first direction relative to the bars and the second side of the bars is located in the second direction relative to the bars. The first and second bars can be called pantograph supports. They are preferably installed vertically, but can also be inclined with respect to a vertical direction.

The system according to the invention can for example be used to protect private property, logistics centers, or storage areas for vehicles, other valuables or equipment. The system according to the invention

B E2017 / 5361 can also be used to avoid prison escapes. The site to be protected is then outside the prison.

The system according to the invention can be used in isolation or in addition to other means of protection.

The first and second bars have in particular the function of supporting the sections and keeping them away from any object which can put them unnecessarily at least partially in short circuit and / or in contact with the ground.

The system can include more than two bars. The guides 10 are then preferably arranged so that the sections describe a zigzag shape.

The system may include more than two sections. A third section, located beyond the second section relative to the first section, is then arranged similarly to the first section.

In the context of this document, two mechanically coupled elements can be fixed, fixed directly, fixed by at least one intermediate element. The mechanical coupling between two elements is preferably such that it maintains the two elements in a fixed position relative to one another. However, it can also be such that a relative movement between the two elements is possible, at least under certain conditions.

The electric generator can for example be a generator as described in one of the following documents: BE1013918, BE1013259 and BEI009022. In one embodiment of the invention, the electric generator is arranged to send electric pulses in the first section.

The system is preferably arranged so that the electrical generator generates in the first section an electrical voltage high enough to discourage any intrusion. For example, the

B E2017 / 5361 electrical voltage in the first section can be between 1000 and 9000V, preferably between 7000 and 800000V.

The detection device is preferably arranged to detect any voltage drop in the first section. For example, it may be able to detect any voltage drop equivalent to an electrical short circuit between 500 and 100 ohms. It is preferably arranged to detect if the first section is cut.

Preferably, the guides are all identical. Preferably, the guides are made of stainless steel.

Preferably, the electric fence wires are made in galvanized cabins 1.6 to 1.8 mm in diameter.

[Ü026] According to one embodiment, each guide comprises a plurality of rings surrounding the bar to which said guide is mechanically coupled, the rings being sufficiently tightened on said bar 15 to maintain said guide in a fixed position on said bar.

This type of mechanical coupling is particularly inexpensive and easy to install. Preferably, the rings are self-locking on the bars.

According to one embodiment, each guide is formed of a metal wire 20. This type of guide is particularly inexpensive and easy to manufacture.

According to one embodiment, each guide comprises two loops, the sections passing through each of the loops of the guides by which iis are guided.

This allows particularly precise guidance of the sections at the level of the guides. This also allows the mechanical coupling between the guides and your sections to be particularly robust. Loops can also be called eyelets. For example, the guides may include two outgoing rods each terminated in a loop.

B E2017 / 5361 Seton an embodiment, the guides are made of an electrically conductive material.

According to one embodiment, the system further comprises a conductive element in electrical contact with the first lower guide and 5 extending along the first bar from the first lower guide to the first upper guide without being in electrical contact with the first upper guide.

Thus, if a crook tries to bring the first lower guide closer to the first upper guide to spread the sections of wire, there will be an electrical contact between them, via the conductive element, without them having to touch each other. . This electrical contact will be immediately detected by the detection device.

Preferably, the system also includes another conductive element in electrical contact with the second lower guide and 15 extending along the first bar from the second lower guide to the second upper guide.

According to one embodiment, the conductive element comprises a plurality of rings surrounding the first bar. For example, the conductive element can be a spring. Preferably, the conductive element 20 is slid around the first bar and rests on the first lower guide because of the gravity.

According to one embodiment, your bars are made of a composite material comprising 1a glass fiber. This allows the bars to be particularly light, solid, discreet and inexpensive.

According to one embodiment, the system is arranged so that the second section is at a fixed electrical potential, for example ia earth.

According to one embodiment, the system further comprises an alarm device connected to the detection device and arranged to carry out at least one of the following actions if the detection device

BE2017 / 5361 detects an electrical contact between the first section and the second section:

® control surveillance cameras, "send a signal to an electronic device such as an alarm center, computer, telephone or mobile phone, and ® activate lighting, preferably directed to where the contact electric between the first section and the second section occurs.

These various techniques allowing a warning of the persons concerned and / or a doubt raised via the cameras, and / or to deter intrusion. The alarm device can be placed in a terminal block. According to one embodiment, the system further comprises fixing elements mechanically coupling your bars to fixed elements such as walls or posts. These fixing elements allow the mounting of the bars to the fixed elements.

[G041] According to one embodiment, the system further comprises posts fixed to the ground and a grid or a lattice fixed to the posts, ies fixing elements fixing the bars to the posts and each bar being fixed to a single post.

[Ö042] The posts are located towards the interior of the site protected by the system in relation to the bars. In other words, the bars are inside the mesh attached to the posts. Thus, an intruder will have to cut the fence before reaching the sections of electric wire and generating the detection of the intrusion.

Preferably. ie the system is such that the wire mesh is less than 15 cm from the sections of electric wire.

H is also possible, while remaining within the scope of the invention, that the bars are fixed, by fastening elements, to another element (for example è a wall, a panel fencing, a fence to bars).

B E2017 / 5361 According to one embodiment, the distance between the first upper guide and the first lower guide is at most 30 cm, preferably at most 20 cm, between 10 and 15 cm.

Likewise for the distance between the second upper guide and the second lower guide. Preferably, the distance between the first upper guide and the first lower guide is equal to the distance between the second upper guide and the second lower guide.

The inventor has found that it is preferable to keep the guides fixed to the same bar at a distance which is less than a certain threshold, so that it is difficult to pass between the sections.

In one embodiment of the invention, the distance between successive guides coupled to the same bar is smaller in a lower part of the bar and larger in an upper part of the bar. For example, it can be 10 cm for the guides located in a lower part of the bar and 15 cm for the guides located in an upper parke of the bar.

According to one embodiment, the system comprises at least six sections of electric wire and a number of guides per bar equal to the number of sections, each section passing through a guide on each bar, the system being arranged so that each section either at an electrical potential different from the following section.

Preferably, the system comprises, on each bar, a number of conductive elements equal to the number of guides per bar minus one. There is then a conductive element in each space between two guides.

According to one embodiment, the system comprises at least three bars, each bar being mechanically coupled to at least two guides each section passing through a guide on each bar.

Preferably, the arrangement between the bars, the guides and the sections described for the second bar relative to the first bar

B E2017 / 5361 is reproduced for third bar with respect to the second bar, for the fourth bar with respect to the third bar etc.

According to one embodiment, the system further comprises tensioners mechanically coupled to the sections and to fixed elements 5, for example walls or posts, and arranged to maintain mechanical tension in the sections. The tensioners are preferably provided to compensate for temperature changes. The tensioners can for example be attached to reinforced bars or to reinforced corners.

This prevents the sections from relaxing. Thus, the mechanical tension in the sections can be constant.

According to one embodiment, the system comprises two overhanging elements, each overhanging element being fixed to a bar and inclined relative to the bar to which it is fixed and an additional section 15 of electric wire mechanically coupled to the elements overhanging and electrically connected to the electric generator.

The overhanging elements are preferably fixed to the upper ends of the bars. The overhanging elements are preferably rectilinear. The overhanging elements are preferably inclined by 45 ° relative to the bars. The overhanging elements can be called low shutters. The overhanging elements make intrusion on the upper part of the system more difficult. The overhanging elements make it possible to prevent a ladder from being placed, they can serve as a support for guides as described in this document, in order to pass a first and a second section of electrical wires.

For example, they can serve as a support for insulators as described in document BE1013918 to which sections of live electrical wires are attached and connected to the electrical generator. The stop described in this document can also be implemented, so as to detect any traction made on the additional section.

B E2017 / 5361 According to one embodiment, the electric generator is arranged to supply a voltage between 5000 and 9000 V to the first section of wire.

This provides a deterrent effect if an intruder touches the first section.

Brief description of the figures Other characteristics and advantages of the invention will appear on reading the detailed description which follows for the understanding of which reference will be made to the appended figures among which:

- Figure 1 illustrates a perspective view of a fence system according to an embodiment of the invention,

- Figure 2 is a top view of a fence system according to an embodiment of the invention,

FIG. 3 illustrates part of the first bar with the first lower guide, the first upper guide and the conductive element as they are arranged in an embodiment of the invention, and

- Figure 4 illustrates a perspective view of a fence system according to an embodiment of the invention.

IVlodes for Carrying Out the Invention The present invention is described with particular embodiments and references to figures, but the invention is not limited by these. The drawings or figures described are only schematic and are not limiting.

In the context of this document, the terms "first" and "second" only serve to differentiate the different elements and do not imply an order between these elements.

In the figures, identical or similar elements may bear the same references.

B E2017 / 5361 [0063] Figure 1 illustrates a fence system according to an embodiment of the invention. The system according to the invention can for example be used for protection against the intrusion of a site with a defined perimeter.

[Ô064] The system comprises a first bar 11 and a second bar 12. It can also include a third bar 13 and a fourth bar 14. Preferably, your bars 11, 12, 13, 14 are installed vertically along the perimeter , with a space between them.

[Ö065] The system further comprises a first section 51 of electric fence wire and a second section 52 of electric fence wire. It can also include a third 53, a fourth 54, a fifth 55 and a sixth 56 sections of electric fence wire. In one embodiment of the invention, the system comprises at least twelve sections of electric fence wire, preferably between twelve and twenty sections of electric fence wire. Preferably, the sections are arranged horizontally.

In one embodiment of the invention, one section in two is at a first electrical voltage and the other is at a second electrical voltage. For example, the first 51, third 53 and fifth 55 sections are at a first electrical voltage and the second 52, fourth 54 and sixth 56 sections are at a second electrical voltage. Preferably, one section in two is electrified by an electric generator (not shown) and can be at a voltage between 7000 and 8000V and the other section in two is at a constant electrical potential, for example 0 V.

Each section 51, 52 is mechanically coupled to each of the bars 11, 12, 13, 14 by a guide. The first section 51 is mechanically coupled to the first bar 11 by a first upper guide 21, to the second bar 12 by a second upper guide 32, to the third bar 13 by a third upper guide 23, and to the fourth bar 14 by

B E2017 / 5361 a fourth upper guide 34. The second section 52 is mechanically coupled to the first bar 11 by a first lower guide 31, to the second bar 12 by a second lower guide 22, to the third bar 13 by a third guide lower 33, and to the fourth bar 14 by a fourth lower guide 24. The same for the other sections 53, 54, 55, 56.

The guides 21, 31 mechanically coupled to the first bar 11 are arranged successively alternately in a first direction 101 and in a second direction 102 relative to the first bar 11. The guides 22, 32 mechanically coupled to the second bar 12 are arranged successively alternately in the second direction 102 and in the first direction 101 relative to the second bar 12.

Thus, since the second bar 12 follows the first bar 11 along the perimeter, the first section 51 passes successively from a first side of the first bar 11 (which corresponds to the first direction 101) and from a second side from the second bar 12 (which corresponds to the second direction 102): and the second section 52 passes successively from the second side of the first bar 11 (which corresponds to the second direction 102) and from the first side of the second bar 12 (which corresponds to the first sense 101). The sections 51, 52 are therefore, between each bar 11, 12, 13, 14, in vertical planes which intersect, as illustrated in FIG. 2.

Therefore, according to one embodiment of the invention, if a thief attempts to create a gap for intrusion between the different electrified wires 51, 53, 55 and ground wires 52, 54, 56 the contact thus established between your electrified wires 51, 53, 55 and ground wires 52, 54, 56 will generate a voltage drop detected by the detection device.

The distance between two guides on the same bar is preferably less than 30 cm, more preferably less than 20 cm,

B E2017 / 5361 even more preferably between 10 cm and 20 cm. For example, it can be between 12 and 15 cm.

Preferably, the bars 11, 12, 13, 14 are made of an electrical insulating material. For example, the bars 11, 12, 13, 14 can be a composite material comprising fiberglass or fiberglass.

In one embodiment of the invention, the sections 51, 53, 55 to a first electrical voltage are electrically connected to each other, for example in series, and your sections 52, 54, 56 to a second electrical voltage are electrically connected to each other, for example 10 in series. For example, the sections 52, 54, 56 at a second electrical voltage can be connected to a ground stake arranged at each end of the system.

The system further comprises a detection device (not illustrated) capable of detecting electrical contact between a section 51, 53, 15 55 at a first electrical voltage and a section 52, 54. 56 at a second electrical voltage. The system may further include an alarm device (not shown) connected to the detection device. The alarm device can perform at least one of the following actions: direct a surveillance camera towards the zone where an electrical contact has been detected, activate lighting in this zone and send a message to an electronic device such as a central alarm, computer, telephone or mobile phone.

In one embodiment of the invention, the system further comprises fastening elements 6 mechanically coupling the bars 11, 12, 13, 14 to fixed elements such as walls or posts 7. Preferably , each bar 11, 12, 13, 14 is mechanically coupled by at least two fastening elements 6, which can for example be spaced vertically. Preferably, the bars 11, 12, 13, 14 are coupled to the fixed elements so as not to touch the self.

B E2017 / 5361 In one embodiment of Hnvention. Ie system comprises, in addition to your posts 7, which are preferably fixed to the ground, a screen (not shown) fixed to said posts 7. The posts 7 and the screen are preferably located towards the outside of the site protected by the system according to the invention.

In one embodiment of the invention, the system further comprises tensioners (not shown). Preferably, each section 51, 52 is stretched between two tensioners so as to undergo a mechanical tension which allows it to remain rectilinear between the guides. Thus, your sections 51, 52 describe essentially straight lines between the guides 21, 22, 23, 24, 31, 32, 33, 34. Preferably, the system includes tensioners every 100 meters. Preferably, each tensioner comprises a compression spring ensuring mechanical tension on the wires whatever the temperature.

In one embodiment of the invention, your guides 21, 22, 23, 24, 31, 32, 33, 34 are made of an electrically conductive material.

In one embodiment of the invention, the system further comprises conductive elements 41 located along the bars 11, 12, 13, 14 between two guides 21, 22, 23, 24, 31, 32, 33 , 34 successive coupled to the same bar. Each conductive element 41 is electrically coupled with only one of the two guides 21, 22, 23, 24, 31, 32, 33, 34 between which it is positioned and is located at a distance from the other. This distance can be for example 25 mm. Each conductive element 41 is mechanically coupled to a bar 11, 12, 13, 14. Preferably, each conductive element 41 comprises a plurality of rings surrounding the bar to which it is coupled, thus forming a spring.

In one embodiment of the invention, each bar 11, 12, 13, 14 has a length between one meter and three meters. Preferably, each bar is approximately 2400 mm.

B E2017 / 5361 In one embodiment of the invention, guides arranged in staggered rows as described with reference to FIG. 1 are mechanically coupled to a first part of each of the bars and aligned guides are mechanically coupled to a second part of each of the bars.

Figure 2 is a top view of a fence system according to an embodiment of the invention. We see the posts 7, the bars 11, 12, 13, 14, the guides 21, 22, 23, 24, 31, 32, 33, 34 and the sections 51, 52. The fastening elements 6 do not have have been represented for the sake of clarity. It is clear that the first 51 and the second 52 sections are, between each bar 11, 12, 13, 14, in vertical planes which intersect. In other words, the sections 51, 52 appear to be arranged in a zigzag when viewed from the top.

FIG. 3 illustrates a part of the first bar 11 with the lower guide promscr 31, the first upper guide 21 and the conductive element 41 as they are arranged in an embodiment of the invention. Preferably, each guide 21, 31 comprises a plurality of rings 81 surrounding the bar 11 so that the rings 81 are sufficiently sown on the bar 11 to maintain this guide 21, 31 in a fixed position on the bar 11. In one embodiment of the invention, the guides 21, 31 are formed from a twisted metal wire.

In one embodiment of the invention, the guides 21, 31 each comprise two loops 82. The first section 51 passes successively through the two loops 82 of the first upper guide 21 and the second section 52 passes successively through the two loops 82 first lower section 31.

[8085] In one embodiment of the invention, the conductive element 41 rests on the first lower section 31 and is electrically coupled to it, and is spaced a certain distance from the first upper guide

21.

B E2017 / 5361 [0086] Figure 4 illustrates a fence system according to one embodiment of the invention. This embodiment of the invention comprises the elements of the system described with reference to FIG. 1 and overhanging elements 9 fixed to some or all of the bars 11, 12, 13, 14, preferably at their upper end. Each overhanging element 9 is inclined relative to the bar 11, 12, 13, 14, to which it is fixed. Preferably, the system further comprises at least one additional section 91 of electric wire mechanically coupled to the overhanging elements 9 by mechanical coupling means 40, The additional section 91 is preferably electrically connected to the electric generator so as to be energized .

In other words, the invention relates to a site protection fence system. The system comprises bars 11, 12, 13, 14, preferably vertical. Guides 21, 22, 23, 24, 31, 32, 33, 34 are fixed to the bars 11, 12, 13, 14. they are arranged in anyone on each bar and so that two guides 21, 32 located at the same height on different bars 11, 12 are offset horizontally. Consequently, successive sections 51, 52 of electric wire situated at different heights are, between each bar 11, 12, 13, 14, in intersecting vertical planes. Thus, the sections touch when an intruder pushes them aside in order to provide a passage. As one section in two is connected to one high voltage and the other to earth, their contact can be detected by a detection device.

The present invention has been described in relation to specific embodiments, which have a purely illustrative value and should not be considered as limiting. In general, the present invention is not limited to the illustrated examples eVou described above. The use of the verbs "to understand", "to include", "to include", or any other variant, as well as their conjugations, cannot in any way exclude the presence of elements other than those mentioned. The use of

B E2017 / 5361

Tartid indefinite "a", "an", or the definite article "ie", "la" or "I", to introduce an element does not exclude the presence of a plurality of these elements. Reference numbers in the claims do not limit their scope.

Claims (18)

claims 1. Fence protection system for a perimeter site determined against an intrusion, comprising: 5 ® an electric generator, ® a first bar (11) able to be arranged along the perimeter in an at least partially vertical direction, ® a first upper guide (21) mechanically coupled to the first bar (11), 10 "a first lower guide (31) mechanically coupled to the first bar (11) and offset with respect to the first upper guide (21) along the first bar (11)," a second bar (12) able to be arranged along the perimeter in an at least partially vertical direction and spaced from the First bar (11) along the penetrator, ® a second upper guide (32) mechanically coupled to the second bar (12), ”a second lower guide (22) mechanically coupled to the second bar (12) and offset with respect to to the second guide 20 upper (32) ie along the second bar (12), ® a first section (51) of electric fence wire electrically connected to the electric generator and arranged so as to be guided by the first upper guide (21) and the second upper guide (32), ® a second section (52) of electric fence wire arranged so 25 to be guided by the first lower guide (31) and the second lower guide (22), characterized in that the first (11) and the second bars (12) are made of an electrical insulating material, B E2017 / 5361 ® the system is arranged so that the second section (52) is at an electrical potential different from that of the first section (51), "ie the first upper guide (21) is arranged in a first direction (101) by relative to the first bar (11), "the first lower guide (31) is arranged in a second direction (102) relative to the first bar (11), the second direction (102) being essentially opposite to the first direction (101 ), ® the second upper guide (32) is arranged in the second direction (102) relative to the second bar (12), ® the second lower guide (22) is arranged in the first direction (101) relative to you second bar (12), and ® it further comprises a detection device arranged to detect an electrical contact between the first section (51) and the second section (52). 2. The system of claim 1, wherein each guide (21, 22, 31, 32) comprises a plurality of rings (81) surrounding the bar (11, 12) to which said guide (21,22, 31, 32 ) is mechanically coupled, the rings (81) being sufficiently tightened on said bar (11, 12) to maintain said guide (21,22, 31, 32) in a fixed position on said bar (11,12). 3. System according to any one of the preceding claims, in which each guide (21, 22, 31, 32) is formed by ^! a metal wire. 4. System according to any one of the preceding claims, in which each guide (21, 22, 31, 32) comprises two loops (82), the sections (51, 52) passing through each of the loops (82) of the guides ( 21, 22, 31, 32) by which they are guided. B E2017 / 5361 5. System according to any one of the preceding claims, in which the guides (21, 22, 31, 32) are made of an electrically conductive material. 6. System according to the preceding claim, further comprising a conductive element (41) in electrical contact with the first lower guide (31) and extending along the first bar (11) from the first lower guide (31) towards the first upper guide (21) without being in electrical contact with the first upper guide (21). 7. System according to the preceding claim, Féiément conductive (41) comprises a plurality of rings surrounding the first bar (11). 8. System according to any one of the preceding claims, in which the bars are made of a composite material comprising fiberglass. 9. System according to any one of the preceding claims, arranged so that the second section (52) is at a fixed electrical potential, for example to earth. 10. System according to any one of the preceding claims, further comprising an alarm device connected to the detection device and arranged to perform at least one of the following actions if the detection device detects an electrical contact between the first section (61 ) and the second section (52): "Operate surveillance cameras," send a signal to an electronic device such as an alarm center, computer, telephone or mobile phone, and B E2017 / 5361 ® activate lighting, preferably directed towards where the electrical contact between te first section (51) and the second section (52) occurs. 11. System according to any one of the preceding claims, further comprising fastening elements (5) mechanically coupling the bars (11,12) to fixed elements such as walls or posts. 12. System according to the preceding claim, further comprising posts (7) fixed to the ground and a grid or a trellis fixed to the posts (7), the fixing elements (6) fixing the bars (11, 12) to the posts ( 7) and each bar (11,12) being fixed to a single post (7). 13. System according to any one of the preceding claims, in which the distance between the first upper guide (21) and the first lower guide (31) is at most 30 cm, preferably at most 20 cm, more preferably between 10 and 15 cm. 14. System according to any one of the preceding claims, comprising at least six sections (51,52) of electric wire and a number of guides (21, 22, 31, 32) per bar (11, 12) equal to the number of sections (51, 52), each section (51, 52) passing through a guide (21, 22, 31, 32) on each bar (11, 12), the system being arranged so that each section (51, 52) is to an electrical potential different from the following section (51, 52). 15. System according to any one of the preceding claims, comprising at least three bars (11, 12, 13, 14), each bar (11, 12, 13, 14) being mechanically coupled to at least two guides (21, 22, 23 , 24, 31, 32, 33, 34) each section (51, 52) passing through a guide (21, 22, B E2017 / 5361 16. System according to any one of the preceding claims, further comprising tensioners mechanically coupled to the sections (51, 52) and to fixed elements, for example walls or posts, and 5 arranged to maintain mechanical tension in your sections (51,52). 17. System according to any one of the preceding claims, further comprising two overhanging elements (9), each overhanging element (9) being fixed to a bar (11, 12) and inclined relative to the bar. 10 (11, 12) to which it is fixed and an additional section (91) of electric wire mechanically coupled to the overhanging elements (9) and electrically connected to the electric generator. 18. System according to any one of the preceding claims, in which the electric generator is arranged to supply a voltage between 7000 and 8000 V to the first section (51) of wire.