On-cable pressure barrier device, manufacturing process for manufacturing the device, and motor compressor line incorporating the device.

Abstract

An on-cable pressure barrier device (6) is attached to a cable having an insulating sheath (3d) around a plurality of individually insulated wires (3e), wherein a portion of the cable within the on-cable pressure barrier device has all insulation stripped off to expose the conductive cores (6d1, 6d2) of each of the plurality of wires (6c1, 6c2), and the on-cable pressure barrier device (6) includes a resin portion (6f) extending over the first portion (6d1) of the exposed conductive core of each wire connected to a first portion (3c1) of the cable via the first portion (6d1) of the wire, and the second portion (6d2) of the exposed conductive core of each wire connected to a second portion (3c2) of the cable via the second portion (6c2) of the wire extends outside the resin portion (6f), and the exposed conductive core of each wire and the resin portion (6f) can stop the diffusion of gas entering from the first portion of the cable.

Description

[[Technical Field]]

[0001] The present invention relates to a sealing barrier for cable connection, particularly for cable connection in a pressurized environment.

[0002] (Prior Art) A motor compressor houses the compressor and the turbine in a single hermetic casing, reducing the risk of leakage. In some embodiments, the motor compressor also comprises a magnetic bearing or AMB, an acronym for "Active Magnetic Bearing".

[0003] Such motor compressors are commonly used to pressurize explosive substances such as natural gas or hazardous gases such as carbon dioxide. In such applications, the motor compressor operates at an internal pressure far higher than the atmospheric pressure. Due to the hazardous gases contained, such motor compressors are generally arranged in areas with restricted access such as ATEX or HAZLOC zones. ATEX stands for "Atmosphere Explosible" in French, and is based on European directives concerning hazardous and explosive atmospheres. It is the equivalent in Europe to the HAZLOC standard in the United States. HAZLOC stands for "Hazardous Location", and is a United States standard for hazardous and explosive atmospheres.

[0004] Control cabinets used to control such motor compressors are not arranged in restricted access areas such as that of the motor compressor, but are arranged in safe areas in accordance with the ATEX directive.

[0005] Figure 1 shows a motor compressor ICL, an acronym for "motor compressor line", comprising a medium voltage junction box 1 connecting a control cabinet 2 to a motor compressor 3. A first cable 2c connects the control cabinet 2 to the medium voltage junction box 1, and a second cable 3c connects the medium voltage junction box 1 to the motor compressor 3.

[0006] The medium-voltage junction box 1 and the motor compressor 3 are both located in the ATEX area, and the control cabinet 2 is located in the safety area outlined by reference numeral 5.

[0007] Each cable 2c and 3c comprises an insulating sheath 2d and 3d, and multiple wires 2e and 3e, each consisting of at least two wires. Each cable 2c and 3c is ATEX rated.

[0008] These cables 2c and 3c are connected to the medium-voltage junction box 1 and the control cabinet 2 via cable glands 2a, 2f, and 3f.

[0009] The control cabinet 2 is connected to the motor compressor 3 via ATEX rated connectors 3a and 3b. The ATEX rated connectors provide a first pressure barrier against gas diffusion through the electrical connection.

[0010] However, a complete or partial failure of connectors 3a and 3b could lead to a gas leak in the second cable 3c. The gas could then diffuse along cable 3b to the medium-voltage junction box 1. The insulating sheath 3d then behaves like a hose, piping the gas from connectors 3a and 3b to the medium-voltage junction box.

[0011] In such a case, there is a risk of gas accumulation in the medium-voltage junction box 1 and a risk of secondary gas diffusion along the first cable 2c to the control cabinet 2 in the safety zone.

[0012] The arrows indicate the initial and secondary gas diffusion.

[0013] Such secondary diffusion invalidates ATEX / HAZLOC zoning and poses a risk to personnel and facilities housing motor compressors.

[0014] To mitigate such potential failures, both gas accumulation within the medium-voltage junction box and secondary diffusion through the first cable 2c must be prevented.

[0015] A hood 4b and a gas detector 4c are typically provided. If gas diffuses through the second cable 3c, the gas accumulated in the medium-voltage junction box 1 is discharged through the breather valve 4a and guided to the gas detector 4c by the hood 4b. As soon as gas is detected, an alarm and / or a signal linked to a contingency response is issued. Such contingency response may include stopping the motor compressor 3 or notifying facility personnel of the incident.

[0016] It can be understood that triggering such alarms or countermeasures for unforeseen events may slow down or interfere with the operation of installations that include a motor compressor.

[0017] A motor compressor is needed that can maximize its operating time while mitigating all gas diffusion risks.

[0018] The following documents are known: British Patent No. 1188286, German Patent No. 2209629, and German Patent No. 2440826.

[0019] British Patent No. 1188286 discloses a method for forming a gas seal in an electrical cable. The insulating sheath is removed and a porous material is added in its place, allowing gas to diffuse out of the cable.

[0020] However, the described method does not disclose how to prevent the gas from spreading further into the cable beyond the gas seal.

[0021] German Patent Nos. 2209629 and 2440826 disclose methods for sealing cables after splitting. These documents deal with restoring the integrity of the sheathing, but say nothing about gas diffusion and potential barriers against such diffusion.

[0022] The technical issues are not resolved by these documents. [Overview of the project]

[0023] The object of the present invention is an on-cable pressure barrier device attached to a cable having an insulating sheath around a plurality of individually insulated wires. The cable within the on-cable pressure barrier device has all insulation stripped off to expose the conductive core of each of the plurality of wires, and the on-cable pressure barrier device includes a resin portion extending over the first portion of the exposed conductive core of each wire connected to a first portion of the cable, and a second portion of the exposed conductive core of each wire connected to a second portion of the cable extending outside the resin portion, and the exposed conductive core and resin portion of each wire can prevent the diffusion of gas entering from the second portion of the cable.

[0024] The on-cable pressure barrier device may include a housing that has a breather valve in communication with the inside of the housing, which contains ambient air.

[0025] The comb can be installed and removably fixed to the housing, keeping the wires separated.

[0026] Multiple wires may include at least two wires of at least two different gauges or diameters.

[0027] The comb can be mounted on the housing and removably fixed to keep the wires separated, and the comb can accommodate different wire gauges thanks to the different spacing sizes between the teeth of the comb.

[0028] The comb can be placed on the exposed conductive core of the wire.

[0029] Two combs may be provided, each comb being arranged on one side of the exposed conductive core of the wire.

[0030] The housing may comprise three parts, the first part corresponding to one half of the housing and extending from the first portion of the cable to the second portion of the cable, the other half of the housing being divided into a second part and a third part, the second part extending to the second portion of the cable, and the third part extending to the first portion of the cable.

[0031] Another object of the present invention is a motor compressor line comprising the above-mentioned on-cable pressure barrier device, the motor compressor line comprising a medium-voltage junction box connected to a control cabinet by a first cable and connected to a motor compressor by a second cable, each cable comprising an insulating sheath around at least two individually insulated wires, the medium-voltage junction box, the motor compressor and the second cable being arranged in a hazardous or explosive atmosphere, the control cabinet and the first cable being arranged in a safe atmosphere, and the on-cable pressure barrier device being installed on the second cable to reduce gas diffusion from the motor compressor to the control cabinet through the medium-voltage junction box.

[0032] Another object of the present invention is a manufacturing process for an on-cable pressure barrier device as described above, the manufacturing process comprising the following steps: a. determining a proper position of the on-cable pressure barrier device on the cable; b. removing the insulating sheath of the cable at the determined position without cutting the wires contained therein; c. for each wire exposed by removing the insulating sheath of the cable, removing a part of the wire insulating sheath such that the conductive core is exposed; d. A step of inserting a cable through gaskets provided on opposing surfaces of a first part of the housing, wherein the cable is located inside each gasket such that the cable between the two gaskets does not include its insulating sheath, e. The step of installing the second part of the housing to form an airtight seal with the first part of the housing, f. A step of injecting a curable resin into the housing and encapsulating the first portion of the exposed conductive core of each wire, together with the wire between the first exposed conductive core portion and the first gasket, wherein the first gasket is in contact with the cable extending from the on-cable pressure barrier device to the medium-voltage junction box. g. A step of curing the resin, Includes.

[0033] A further object of the present invention is a manufacturing process for an on-cable pressure barrier device as described above, comprising a housing consisting of three parts, the manufacturing process comprising the following steps: a. The step of determining the appropriate location of the on-cable pressure barrier device on the cable, b. The step of removing the cable's insulating sheath at a determined location without cutting the wires contained therein, c. For each wire exposed by removing the cable's insulating sheath, a step of removing a portion of the wire insulating sheath so that the conductive core is exposed, d. A step of inserting a cable through gaskets provided on opposing surfaces of a first part of the housing, wherein the cable is located inside each gasket such that the cable between the two gaskets does not include its insulating sheath, e. The step of installing the second part of the enclosure to achieve an airtight seal with the first part of the enclosure, f. A step of injecting a curable resin into the housing and encapsulating the first portion of the exposed conductive core of each wire, together with the wire between the first exposed conductive core portion and the first gasket, wherein the first gasket is in contact with the cable extending from the on-cable pressure barrier device to the medium-voltage junction box. g. The resin is cured, and then the third part of the housing is installed such that an airtight seal is achieved between both the first part of the housing and the second part of the housing. This is a manufacturing process that includes [the following]. [Brief explanation of the drawing]

[0034] The present invention is considered entirely non-limiting examples and will be better understood by considering a detailed description of some embodiments shown in the accompanying drawings. [Figure 1] This shows a motor compressor equipped with a medium-voltage junction box having a breather valve and a detector. [Figure 2] This shows a motor compressor equipped with an on-cable pressure barrier device according to the present invention. [Figure 3] The main components of an on-cable pressure barrier device are shown. [Figure 4] The main components of an on-cable pressure barrier device, including the comb, are shown. [Figure 5] This shows the main components of the housing for an on-cable pressure barrier device. [Modes for carrying out the invention]

[0035] Figure 2 shows a motor compressor according to the present invention. Elements common to the control system shown in Figure 1 have the same reference numerals.

[0036] The motor compressor includes a medium-voltage junction box 1 that connects the control cabinet 2 to the motor compressor 3. A first cable 2c connects the control cabinet 2 to the medium-voltage junction box 1, and second cables 3c1 and 3c2 connect the medium-voltage junction box 1 to the motor compressor 3. The first cable 2c and the second cables 3c1 and 3c2 are connected to each other via a connection plate 1a contained within the medium-voltage junction box 1.

[0037] The medium-voltage junction box 1 and the motor compressor 3 are both located in the ATEX region, while the control cabinet 2 is located in the safety region as outlined by reference numeral 5.

[0038] Each cable (2c, 3c1, 3c2) consists of an insulating sheath (2d, 3d) and multiple wires (2e, 3e). Each cable is ATEX rated.

[0039] The medium-voltage junction box is equipped with a first cable gland 2f, and the first cable 2c is connected to the command cabinet 2 via the first cable gland 2f. The command cabinet 2 is equipped with its own cable gland 2a, and the first cable 2c is connected to it via the cable gland 2a.

[0040] The medium-voltage junction box includes a second cable gland 3f to which the second cables 3c1 and 3c2 are connected.

[0041] The control cabinet 2 is connected to the motor compressor 3 via ATEX rated connectors 3a and 3b.

[0042] Similar to the gas diffusion risks described for the control system shown in Figure 1, there is a risk of gas diffusion via the second cables 3c1 and 3c2 from the motor compressor 3 to the medium-voltage junction box 1, even when ATEX-rated cables 2c, 3c1, and 3c2 and ATEX-rated connectors 3a and 3b are used.

[0043] To avoid such gas diffusion and any consequences (gas accumulation in the medium-voltage junction box 1 or further diffusion through the first cable 2c), an on-cable pressure barrier device 6 is provided on the second cables 3c1 and 3c2. More precisely, the first portion 3c1 of the second cable connects the medium-voltage junction box 1 to the on-cable pressure barrier device 6. The second portion 3c2 of the second cable connects the cable pressure barrier device 6 to the motor compressor 3. Although two portions 3c1 and 3c2 are described, the second cables 3c1 and 3c2 are not interrupted during the installation of the on-cable pressure barrier device 6, as will be readily apparent in this description.

[0044] Figure 3 shows the main components of the on-cable pressure barrier device 6 according to the present invention. The on-cable pressure barrier device 6 is particularly advantageous because its installation does not require interrupting the support cables 3c1 and 3c2 (i.e., the wires contained in the second cables 3c1 and 3c2 are kept intact during installation).

[0045] The on-cable pressure barrier device 6 comprises a housing 6a, a breather valve 6b, two gaskets 6g and 6h, and a resin part 6f.

[0046] The housing 6a is designed to open into at least two parts in order to be positioned on the second cables 3c1 and 3c2.

[0047] The second cables 3c1 and 3c2 are secured inside the housing 6a thanks to gaskets 6g and 6h, which also make the housing 6a airtight.

[0048] The second cables 3c1 and 3c2 contained within the enclosure 6a have their insulating sheaths 3d stripped off. As a result, at least one wire 6c1 or 6c2, which is part of the multiple wires 3e within the second cables 3c1 and 3c2, is loose within the enclosure 6a.

[0049] In order for the on-cable pressure barrier device 6 to acquire its barrier properties, each wire 6c1, 6c2 has a portion of its insulating sheath stripped off so that its conductive cores 6d1, 6d2 are exposed. Within the on-cable pressure barrier device 6, each wire comprises a first portion 6c1 having its insulating sheath, a first exposed conductive core portion 6d1, a second exposed conductive core portion 6d2, and a second portion 6c2 having its insulating sheath. Although two portions 6c1, 6c2 are described for each wire, the wires 6c1, 6c2 and their exposed conductive cores 6d1, 6d2 are not interrupted during the installation of the on-cable pressure barrier device 6, as will be readily apparent in this description. Subsequently, a resin portion 6f is formed within the housing 6a and covers the first portion 6d1 of the exposed conductive core of each wire 6c1, 6c2, along with the first portion 6c1 of each wire up to the first gasket 6g through which the first portion 3c1 of the second cable passes. The resin portion 6f extends in the other direction to the housing 6a.

[0050] The rest of the housing is kept resin-free and includes the second portion 6d2 of the exposed conductive core of each wire, along with the second portion 6c2 of each wire up to the second gasket 6h through which the second portion 3c2 of the second cable passes.

[0051] If gas diffuses within the insulating sheath 3d of the second portion 3c2 of the second cable, the gas is released into the housing 6a through the second portion 6d2 of the exposed conductive core of each wire extending outside the resin portion 6f.

[0052] However, due to the mating contact between the resin portion 6f, the first portion 6d1 of each exposed conductive core, and the first portion 6c1 of each wire, gas diffusion is prevented from further propagating, particularly along the first portion 3c1 of the second cable and the first portion 6d1 of each wire. The gas is then discharged through the breather valve 6b.

[0053] Therefore, it is understood that the internal space of the housing 6a contains either ambient air, at least one gas if a gas leak occurs inside the box, or a mixture of ambient air and at least one gas. The ambient air, at least one gas, or mixture of ambient air and at least one gas has a pressure within the housing that corresponds to, is comparable to, or is approximately equal to the ambient air pressure. In a preferred embodiment, the ambient air, at least one gas, or mixture of ambient air and at least one gas within the housing has a pressure equal to the ambient air pressure. An object of the present invention is to provide an internal space of the housing that is not pressurized relative to the external air atmosphere thanks to the breather valve 6b.

[0054] To fully understand the operation of the on-cable pressure barrier device 6, we must recall the fundamental laws of diffusion.

[0055] Gas diffusion occurs when a pressure difference exists between two connected regions. In this application, the motor compressor 3 contains a casing in which the gas is under pressurization. The motor compressor 3 must be powered and controlled, which means that at least cables 3c1 and 3c2 are present. Cables 3c1 and 3c2 are connected via ATEX-rated connectors as described above. These connectors are designed to form a first pressure barrier against gas diffusion.

[0056] However, in some cases, the first pressure barrier may fail, and the gas may still diffuse through both the second cable sheath 3d and the insulating sheaths of the individual wires 6c1, 6c2, then both function as ducts. Upon reaching the on-cable pressure barrier device 6, the second cable sheath 3d is interrupted by the second gasket 6h. The gas diffusing through the second cable sheath 3d then diffuses into the atmosphere around the gasket or into the on-cable pressure barrier device housing 6a.

[0057] Similarly, upon reaching the on-cable pressure barrier device 6, each wire insulation sheath is interrupted at the exposed core portions 6d1, 6d2.

[0058] The gas diffusing through the wire insulation sheath then diffuses into the housing 6a of the on-cable pressure barrier device.

[0059] In both cases, the gas diffusing within the on-cable pressure barrier device housing 6a is then discharged into the ATEX atmosphere through the breather valve 6b. The breather valve 6b is used to maintain the pressure within the housing 6a at atmospheric level. This discharge prevents gas buildup within the housing 6a. Finally, the fitting between the resin portion 6f, the first portion 6d1 of the exposed conductive core of each wire, and the housing 6a prevents any further gas diffusion. The breather valve 6b also keeps the pressure low, further preventing gas diffusion.

[0060] It is clear that the on-cable pressure barrier device 6 can be considered as a second pressure barrier against gas diffusion generated from the motor compressor 3.

[0061] In some embodiments, after the conductive cores 6d1 and 6d2 of wires 6c1 and 6c2 are exposed, there is a risk of short circuits or arc discharge between wires 6c1 and 6c2. To keep the exposed conductive cores 6d1 and 6d2 isolated, a comb 6e is then installed and removably fixed to the housing 6a, as shown in Figure 4. The comb 6e is obviously manufactured from a non-conductive material. A further advantage of the comb 6e is that it facilitates the setting of the resin portion 6f by providing a visual indication of the amount of resin to be injected, particularly when the comb 6e is placed on the exposed conductive cores 6d1 and 6d2 of the wires.

[0062] When comb 6e is used as such a visual indicator, it is positioned between the first portion 6d1 and the second portion 6d2 of the exposed conductive core of each wire 6c1, 6c2. Alternatively, comb 6e can be removed before the curable resin is injected and cured. After the resin has cured, the comb is embedded within the resin portion 6f and can no longer be removed.

[0063] In other embodiments, to reduce the risk of short circuits and arc discharges, the comb 6e may be positioned further away from the exposed conductive cores 6d1, 6d2 of the wire, still having an insulating sheath, as long as the exposed conductive core portions 6d1, 6d2 are kept at an appropriate distance from each other. In yet another embodiment, two combs may be provided on the exposed conductive core portions 6d1, 6d2 of the wire, or one on each side of the exposed core portions 6d1, 6d2 of the wire.

[0064] In some further embodiments, the wires 6c1, 6c2 are of at least two different gauges or diameters. At least one comb 6e can accommodate different wire gauges thanks to different spacings between teeth, forming openings of different sizes.

[0065] It should be emphasized that the continuity of the second cables 3c1 and 3c2 will not be altered by the installation of the on-cable pressure barrier device 6. The first portion 3c1 and the second portion 3c2 of the second cable are simply intended to be labeled on one side and the other side of the on-cable pressure barrier device 6.

[0066] Next, the manufacturing process for on-cable pressure barrier devices will be described. The manufacturing process includes the following steps:

[0067] During the first step, the position of the on-cable pressure barrier device 6 is determined on the second cables 3c1 and 3c2 that connect the medium-voltage connection box 1 to the motor compressor 3.

[0068] At the determined location, the insulating sheath 3d of the second cables 3c1 and 3c2 is removed for a cable length equal to the length of the housing 6a of the on-cable pressure barrier. The insulating sheath 3d is removed without cutting the wires 6c1 and 6c2 contained within it.

[0069] The individual wires 6c1 and 6c2 contained in the second cables 3c1 and 3c2 are then spread out, not bundled together. The insulating sheath of a limited portion of each wire 6c1 and 6c2 is stripped so that the conductive cores 6d1 and 6d2 are exposed.

[0070] In the second step, the second cables 3c1 and 3c2 are inserted through gaskets 6g and 6h, allowing the gaskets 6g and 6h to be set where the insulating sheath 3d terminates after a portion of it has been removed during the first step of the manufacturing process. The second gasket 6h is located on the motor compressor 3 side, and the first gasket 6g is located on the medium voltage junction box side.

[0071] Gaskets 6g and 6h are provided on the first part of the housing 6a.

[0072] Next, the second part of the housing 6a is sealed together with the first part of the housing 6a.

[0073] A curable resin, particularly PU (an acronym for "polyurethane"), is injected into the housing to fill it, thereby partially encapsulating the first exposed conductive core portion 6d1 of each wire 3c1, 3c2, together with the first portion 3c1 of each wire portion between the first exposed conductive core portion 6d1 and the first gasket 6g, within the resin.

[0074] In certain embodiments, at least one comb 6e is removably fixed to the housing before the curable resin is injected.

[0075] The resin may be either a UV-curable resin or a thermosetting resin, the latter being preferable because heat can be applied through the housing. It should be understood that once the resin has cured, at least one comb 6e can no longer be removed.

[0076] The housing 6a is described as comprising at least two parts. However, a housing consisting of three parts is preferred. Figure 5 shows a housing 6a consisting of three parts.

[0077] The first portion 6a1 corresponds to the half of the housing 6a that extends from the first gasket 6g to the second gasket 6h.

[0078] The other half of the enclosure is divided into a second part 6a2 and a third part 6a3.

[0079] In the manufacturing process, the second portion 6a2 is set before the curable resin is injected. Then, the first portion 6a1 and the second portion 6a2 form a container, and the curable resin can be injected through an opening corresponding to the location of the third portion 6a3. In one embodiment, the second half of the housing is extended between the second portion 6a2 and the third portion 6a3 so that the second portion covers at least the entirety of the resin portion 6f. This is advantageous because it reduces the risk of the curable resin flowing outside the housing 6a when the curable resin is injected.

[0080] Once the resin hardens, the third portion 6a3 of the housing 6a is sealed together with the first portion 6a1 and the second portion 6a2.

[0081] Figures 3, 4, and 5 should be understood to show the breather valve 6b on the same side as the second gasket 6h. However, it is advantageous to install the breather valve 6b so as to be located in a part of the housing where gas accumulation is likely to occur.

[0082] If the density of the gas being considered is higher than the density of the atmosphere surrounding the on-cable pressure barrier device 6, it is more interesting to place the breather valve 6b at the top of the housing 6a.

[0083] If the density of the gas being considered is lower than the density of the atmosphere surrounding the on-cable pressure barrier device 6, it is more interesting to place the breather valve 6b at the very bottom of the housing 6a.

[0084] On-cable pressure barrier devices are described in relation to motor compressors in motor compressor lines. However, it is readily apparent that on-cable pressure barriers can be used on any cable connected to a pressurized environment that may be subject to gas transfer.

[0085] Motor compressor line and on-cable pressure barrier devices enable mitigation of gas diffusion in the event of leakage at the ATEX connector to the motor compressor. [Explanation of symbols]

[0086] 1: Medium voltage junction box 1a: Connection plate 2: Control Cabinet 2a: Cable glands for control cabinets 2c: First cable 2d: Insulation sheath of the first cable 2e: Multiple wires, at least two wires, within the first cable 2F: First Cable Gland 3: Motor Compressor 3a, 3b: ATEX connector 3c, 3c1, 3c2: Second cable 3D: Insulation sheath of the second cable 3e: Multiple wires, at least two wires, within the second cable 3F: Second Cable Gland 4a: Breather valve 4b: Food 4c: Gas detector 5: Boundary between ATEX zone and safety zone 6: On-cable pressure barrier device 6a: Enclosure 6a1: First part of the enclosure 6a2: Second part of the enclosure 6a3: Third part of the enclosure 6b: Breather valve for on-cable pressure barrier device 6c, 6c1, 6c2: Wires included in multiple wires of the second cable 6d, 6d1, 6d2: Conductive core of wire 6e: Comb 6f: Resin part 6g: First gasket 6h: Second gasket

Claims

1. An on-cable pressure barrier device (6) is designed to be attached to a cable (3c1, 3c2) having an insulating sheath (3d) around a plurality of individually insulated wires (3e), wherein the cable (3c1, 3c2) within the on-cable pressure barrier device (6) has all insulation stripped off to expose the conductive cores (6d1, 6d2) of each of the plurality of wires (6c1, 6c2), and the on-cable pressure barrier device (6) is designed to be attached to a cable (3c1, 3c2) having an insulating sheath (3d) around a plurality of individually insulated wires (3e), wherein the cable (3c1, 3c2) within the on-cable pressure barrier device (6) has all insulation stripped off to expose the conductive cores (6d1, 6d2) of each of the plurality of wires, and the on-cable pressure barrier device (6) has a first portion (6d1) of the wires through the first portion of the cable An on-cable pressure barrier device (6) comprising a resin portion (6f) extending over the first portion (6d1) of the exposed conductive core of each wire connected to (3c1), wherein the second portion (6d2) of the exposed conductive core of each wire connected to the second portion (3c2) of the cable via the second portion (6c2) of the wire extends outside the resin portion (6f), and the exposed conductive core of each wire and the resin portion (6f) prevent the diffusion of gas entering from the second portion (3c2) of the cable.

2. The on-cable pressure barrier device (6) comprises a housing (6a) to which a breather valve (6b) is attached, the breather valve (6b) is in communication with the internal space of the housing (6a) containing ambient air, and the housing (6a) comprises the exposed conductive core of the wire, the first portion (6d1) of the wire, the second portion (6c2) of the wire, and the resin portion (6f), as described in claim 1.

3. The on-cable pressure barrier device according to claim 2, wherein a comb (6e) is removably fixed to the housing (6a) in order to keep the wires separated.

4. The on-cable pressure barrier device according to claim 1, wherein the plurality of wires includes at least two wires of at least two different gauges or diameters.

5. The on-cable pressure barrier device (6) comprises a housing (6a) to which a breather valve (6b) is attached, the breather valve (6b) is in communication with an internal space of the housing (6a) containing ambient air, the housing (6a) comprises the exposed conductive core of the wire, the first portion (6d1) of the wire, the second portion (6c2) of the wire, and the resin portion (6f), the on-cable pressure barrier device according to claim 4, wherein a comb (6e) is removably fixed to the housing (6a) to keep the wires isolated, the comb (6e) comprises at least two teeth into which a wire is inserted, and the comb (6e) can accommodate different wire gauges thanks to the variable spacing between the teeth.

6. The on-cable pressure barrier device according to claim 3 or 5, wherein the comb (6e) is positioned on the exposed conductive core (6d1, 6d2) of the wire.

7. An on-cable pressure barrier device according to any one of claims 3, 5, or 6, wherein two combs are provided, each comb being installed on one side of the exposed conductive core (6d1, 6d2) of the wire.

8. The on-cable pressure barrier device according to any one of claims 2, 3, 5 to 7, wherein the housing (6a) comprises three parts, a first part (6a1) corresponding to half of the housing (6a) extending from the first part (3c1) of the cable to the second part (3c2) of the cable, and the other half of the housing (6a) is divided into a second part (6a2) and a third part (6a3), the second part (6a2) extending to the second part (3c2) of the cable, and the third part (6a3) extending to the first part (3c1) of the cable.

9. A motor compressor line comprising an on-cable pressure barrier device (6) according to any one of claims 1 to 8, wherein the motor compressor line comprises a medium-voltage junction box (1) connected to a control cabinet (2) by a first cable (2c) and connected to a motor compressor (3) by second cables (3c1, 3c2), each cable (2c, 3c1, 3c2) comprising an insulating sheath (2d, 3d) around at least two individually insulated wires (2e, 3e), and the medium-voltage junction box A motor compressor line in which a junction box (1), the motor compressor (3), and the second cables (3c1, 3c2) are located in a hazardous or explosive atmosphere, the control cabinet (2) and the first cable (2c) are located in a safe atmosphere, and the on-cable pressure barrier device (6) is installed on the second cables (3c1, 3c2) to reduce gas diffusion from the motor compressor (3) through the medium-voltage junction box (1) to the control cabinet (2).

10. A manufacturing process for an on-cable pressure barrier device according to any one of claims 2, 3, 5 to 7, wherein the manufacturing process is: a. A step of determining the appropriate position of the on-cable pressure barrier device (6) on the cable (3c1, 3c2), b. The step of removing the insulating sheath (3d) of the cable at the determined position without cutting the wires (6c1, 6c2) contained therein, c. The step of removing a portion of the wire insulation sheath so that the conductive cores (6d1, 6d2) are exposed for each wire (6c1, 6c2) exposed by the removal of the insulating sheath (3d) of the cable, d. Inserting the cable through gaskets (6g, 6h) provided on opposing surfaces of the first portion of the housing, such that the cable is located inside each gasket (6g, 6h) and the cable (3c1, 3c2) between the two gaskets (6g, 6h) does not include its insulating sheath, e. The step of installing the second part (6a2) of the housing in order to form an airtight seal with the first part (6a1) of the housing, f. A step of injecting a curable resin into the housing (6a) and encapsulating the first portion (6d1) of the exposed conductive core of each wire together with the first portion (6c1) of each wire between the first exposed conductive core portion (6d1) and the first gasket (6g) in the resin, wherein the first gasket (6g) is in contact with the first portion (3c1) of the cable extending from the on-cable pressure barrier device (6) to the medium-voltage junction box (1), g. A step of curing the resin, A manufacturing process that includes this.

11. A manufacturing process for an on-cable pressure barrier device according to claim 8, wherein the manufacturing process is: a. A step of determining an appropriate position for the on-cable pressure barrier device (6) on the cable, b. The step of removing the insulating sheath (3d) of the cable at the determined position without cutting the wires (6c1, 6c2) contained therein, c. The step of removing a portion of the wire insulation sheath so that the conductive cores (6d1, 6d2) are exposed for each wire (6c1, 6c2) exposed by the removal of the insulating sheath (3d) of the cable, d. Inserting the cable through gaskets (6g, 6h) provided on opposing surfaces of the first portion of the housing, such that the cable is located inside each gasket (6g, 6h) and the cable between the two gaskets (6g, 6h) does not include its insulating sheath, e. The step of installing the second part (6a2) of the housing such that an airtight seal is achieved with the first part (6a1) of the housing, f. A step of injecting a curable resin into the housing (6a) and encapsulating the first portion (6d1) of the exposed conductive core of each wire together with the first portion (6c1) of each wire between the first exposed conductive core portion (6d1) and the first gasket in the resin, wherein the first gasket (6g) is in contact with the first portion (3c1) of the cable extending from the on-cable pressure barrier device (6) to the medium-voltage junction box (1), g. The step of curing the resin, and then installing the third part of the housing (6a3) such that an airtight seal is achieved between both the first part of the housing and the second part of the housing, A manufacturing process that includes this.

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