QUICK RECONSTRUCTION OF THE ELECTRICAL INSTALLATION

Description

[0001] The present invention relates to the field of electricity and more particularly to electrical installations in industrial or commercial sites. STATE OF THE ART

[0002] There are production sites with power-consuming units, such as motors, solenoid valves, and other actuators, which are centrally powered and controlled from one or more control cabinets, known as process control cabinets, containing programmable logic controllers (PLCs) that control the power-consuming units. Steel mills, cement plants, refineries, and water treatment plants are examples of such production sites, which, in particular, implement a continuous production process.

[0003] Such a production site includes an electrical installation, arranged to ensure centralized power distribution, generally comprising a medium or high voltage (MV) switchgear connected to the medium or high voltage network of an electricity supplier, two transformers connected in parallel, one to the high voltage switchgear and the other to a main low-voltage switchboard, two process control cabinets connected to the main low-voltage switchboard, and current-consuming units, each connected to one of the process control cabinets. Each current-consuming unit is connected to each of the process control cabinets by a dedicated power cable and a dedicated control cable extending from the process control cabinet to the current-consuming unit.As a result, such an electrical installation has a very large number of cables running along the buildings in cable trays in which the cables are distributed according to the maximum power they can transmit.

[0004] A major incident, such as a fire affecting one of the process control cabinets, forces the shutdown of the production site, resulting in significant financial and sometimes environmental consequences. It is therefore crucial to be able to restart the installation as quickly as possible. However, restarting the damaged installation requires replacing several kilometers of cables and possibly the process control cabinets themselves, a lengthy operation that significantly impacts both the cost of restarting and the downtime of the installation.

[0005] It is also known, for example in manufacturing plants, that electrical installations provide distributed power and include prefabricated busbars (hereinafter referred to as "busbars"). These busbars transmit power from the plant's power supply to the power-consuming units, which are connected by power cables to the nearest busbars. The power consumption of these units is controlled locally on each unit. Such prefabricated busbars are manufactured by Schneider Electric under the brand name Canalis. SUBJECT OF THE INVENTION

[0006] One aim of the invention is to provide a means to enable, after a disaster, a rapid restart of relatively large production sites. BRIEF SUMMARY OF THE INVENTION

[0007] For this purpose, an electrical installation conforming to claim 1 is provided according to the invention.

[0008] Thus, the power-consuming units are connected to the same two prefabricated busbars connected to the main low-voltage switchboard (one prefabricated power busbar and one prefabricated control busbar). Therefore, in the event of a fire in this switchboard, only the damaged busbars connected to the switchboard will need to be replaced, and not entire cable bundles directly linking each power-consuming unit to the main low-voltage switchboard, as was previously the case. This reduces the amount of cabling required for the installation to function. Furthermore, the installation is much simpler, facilitating its operation and maintenance. The result is significant time savings, allowing for a rapid restart of the installation and substantial cost reductions.

[0009] Other features and advantages of the invention will become apparent from the following description of particular, non-limiting embodiments of the invention. BRIEF DESCRIPTION OF THE FIGURES

[0010] Reference will be made to the attached drawings, including: there figure 1 is a general view of the electrical circuit of an installation according to the invention; the figure 2 is a schematic, partial perspective view of this installation; the figure 3 is a schematic elevation view of a connection box for a first consumer unit to the network; the figure 4 is a schematic elevation view of a connection box for a second consumer unit to the network; the figure 5 is a schematic view of a prefabricated control pipeline in cross-section according to plane V of the figure 2 ; there figure 6 is a detailed perspective view of a section of said prefabricated control pipeline, the section being provided with an opening for the implementation of a first bypass method; the figures 7, 8 et 9 are schematic rear views of a first, second, and third closing cover for said opening, respectively; the figure 10 is a schematic view of a communication network established from one of the command lines; the figure 11 is a partial schematic elevation view of a general low-voltage switchboard of the installation according to the invention; the figure 12 is a partial view of a fire alarm device according to the invention; the figure 13 is a perspective view of the lower part of a connection module for implementing a second branching mode; the figures 14 And 15These are perspective views of this connection module during and after the creation of a branch connection; the figure 16 is a partial schematic perspective view of an installation according to a variant of the invention, the prefabricated pipes being provided with a fairing here in a lowered position; the figure 17 is a partial schematic perspective view of this installation, with the fairing in the raised position; the figure 18 is a cross-sectional view along line XVII-XVII of the figure 16 . DETAILED DESCRIPTION OF THE INVENTION

[0011] With reference to the figures, the invention is described herein in application to a wastewater treatment plant comprising here three successive effluent treatment workshops and for example a pretreatment workshop S1, a sludge removal and deodorization workshop S2, a biological treatment workshop S3.

[0012] The electrical installation according to the invention comprises two incoming networks RA1, RA2 which are connected on the one hand to a current supply and on the other hand to a distribution network RD.

[0013] Each incoming network RA1, RA2 comprises a switchable electrical transformer TC1, TC2 connected on one side to the power grid of an energy distributor and on the other side to a main circuit breaker DG1, DG2, and is configured to deliver a voltage of approximately 400V. From each main circuit breaker DG1, DG2, a control line LC and a power line LP are connected on one side to a low-voltage main switchboard TGBT 1, TGBT2 of the distribution network RD and on the other side to a main switch IG1, IG2. The main switches IG1, IG2 are connected to each other and to a common generator set GE by a power line LP and a control line LC such that: The TC1 coupling electrical transformer can also be connected to the main low voltage switchboard TGBT2; the TC2 coupling electrical transformer can also be connected to the main low voltage switchboard TGBT1; the GE generator set can be connected to one and / or the other of the main low voltage switchboards TGBT1, TGBT2.

[0014] The interconnected electrical transformers are located at a distance from each other (for example, in two different buildings), as are the main low-voltage switchboards. It follows that the risk of a fire affecting one of the transformers or switchboards spreading to the other is therefore low.

[0015] Each main low-voltage switchboard TGBT1, TGBT2 has at least one input or head consisting of a withdrawable switch ID1, ID2 connected by LP, LC lines to the main circuit breaker DG1, DG2 and to the main switch IG1, IG2. Each withdrawable switch ID1, ID2 is configured here to withstand a current of 4000 A. From each withdrawable switch ID1, ID2 run an LC control line and an LP power line which are connected in parallel to three circuit breakers - DJ11, DJ12, DJ13 and DJ21, DJ22, DJ23 respectively - each capable of withstanding 1000 A.

[0016] Each circuit breaker DJ11, DJ12, DJ13, DJ21, DJ22, DJ23 is connected by a power line and a control line to a visible break switch ICV11, ICV12, ICV13, ICV21, ICV22, ICV23 respectively. The visible break switch ICV 11 is connected by a control primary line LC1' and a power primary line LP1' to the visible break switch ICV 21; the visible break switch ICV 12 is connected by a control primary line LC2' and a power primary line LP2' to the visible break switch ICV 22; the visible break switch ICV 13 is connected by a control primary line LC3' and a power primary line LP3' to the visible break switch ICV 23.

[0017] The primary power line LP1' includes a branch to which secondary power lines LP1'' are connected to supply power-consuming units in workshop S1. The primary power line LP2' includes a branch to which secondary power lines LP2'' are connected to supply power-consuming units in workshop S2. The primary power line LP3' includes a branch to which secondary power lines LP3'' are connected to supply power-consuming units in workshop S3.

[0018] The primary control line LC1' includes a branch to which secondary control lines LC1'' are connected to control the power-consuming units of workshop S1. The primary control line LC2' includes a branch to which secondary control lines LC2'' are connected to control the power-consuming units of workshop S2. The primary control line LC3' includes a branch to which secondary control lines LC3'' are connected to control the power-consuming units of workshop S3.

[0019] The lines are formed by prefabricated conduits comprising a profile made of electrically insulating material through which electrical conductors extend in the form of electrically conductive bars, here made of metal such as copper. Prefabricated conduits used for power lines differ from those used for control lines primarily in the cross-section of the electrical conductors, which is larger in power lines. Examples of prefabricated conduits suitable for implementing the invention include those produced by Schneider Electric under the brand name Canalis.

[0020] More specifically: the prefabricated conduits used for the primary power lines LP1', LP2' and LP3' are CANALIS type KS conduits; the prefabricated conduits used for the primary control lines LC1', LC2' and LC3' are CANALIS type KBB conduits; the prefabricated conduits used for the secondary power lines LP1'', LP2'' and LP3' are CANALIS type KN conduits; the prefabricated conduits used for the secondary control lines LC1'', LC2'' and LC3' are CANALIS type KBB conduits.

[0021] CANALIS KS and KN type pipe systems include: a metal profile; two pairs of identical electrical conductors which extend longitudinally in the profile 100 and which are accessible on one of the opposite main faces of the profile via openings made at regular intervals in said main face.

[0022] KBB type CANALIS pipes include: a profile 100 made of electrically insulating material or not (for example, metal); four pairs of identical electrical conductors 101, 101', 101'', 101'‴ extending longitudinally in the profile 100, one pair of electrical conductors 101 and one pair of electrical conductors 101' being accessible through openings provided at regular intervals along the main face 100.1, one pair of electrical conductors 101' and one pair of electrical conductors 101'‴ being accessible through openings provided at regular intervals along the main face 100.2 opposite the main face 100.1; a pair of electrical conductors 102 used here to remotely control emergency lighting units (to control the switching on of these emergency lighting units in case of fire).

[0023] The conductors 101' located on the main face side 100.1 of the prefabricated conduits of the primary control lines LC1', LC2', LC3' are connected: near their end connected to the visible break switches ICV11, ICV12, ICV13, to an emergency unit ES1 comprising a charger and an electric accumulator forming a first energy storage device at a voltage of 24V; near their end connected to the visible break switches ICV21, ICV22, ICV23, to an emergency unit ES2 comprising a charger and an electric accumulator forming a second energy storage device at a voltage of 24V.

[0024] The electrical conductors of a prefabricated conduit are connected to the electrical conductors of an adjacent prefabricated conduit by a rigid electrical joining element or a flexible electrical joining element, such as those shown in 111, 112 on the figure 2 , having two ends each connected to a connection module 130 connected to the electrical conductors of one of the conduits to be connected by the flexible joining element 111, 112. The connection modules 130 and the associated cables are described later in relation to the figures 13à 15 .

[0025] The electrical conductors 101' located on the side of the main face 100.1 of the prefabricated conduits of the primary control lines LC1', LC2', LC3' and the electrical conductors 101' of the prefabricated conduits of the secondary control lines LC1'', LC2'', LC3'' thus form a backup network supplied at a voltage of 24 V.

[0026] Each main low-voltage switchboard TGBT1, TGBT2 includes one or more control PLCs 200 (preferably at least two redundant PLCs) connected to a communication interface 300 linked to the electrical conductors 101 located on the main face side 100.1 of the prefabricated busbars of the primary control lines LC1', LC2', LC3' forming each end of the primary control lines LC1', LC2', LC3'. The communication interface 300 includes a gateway module associated with an input / output module.

[0027] The installation includes 400', 400'' power consumption units, here of two types and symbolized by motors, which are connected to one of the power lines and one of the control lines.

[0028] Each current-consuming unit 400' has at least one power input connected to a junction box 500' containing one or more switches, a contactor, a main circuit breaker, a motor circuit breaker, a communication interface, a fuse holder, and optionally a variable speed drive for the current-consuming unit 400' or a relay controlled by an analog output of the communication interface... The variable speed drive or relay is connected to the power line conductors by a junction box 550' incorporating a fuse holder. The communication interface is connected, via a junction box 560', to the electrical conductors 101 located on the main face side 100.1 of the prefabricated control line conduits.The 550', 560' connection boxes include elastic contacts forming a clamp, for example in the shape of a lyre, which are each engaged on one of the electrical conductors of the line through openings made at regular intervals along the corresponding profile.

[0029] Each 400" current-consuming unit has at least one power input connected to a 500" junction box containing one or more switches 501", a contactor 502", a circuit breaker 503" for the motor, a communication interface 504", a fuse holder 505", and elastic clamp contacts 506", each of which is engaged on one of the line's electrical conductors through openings made at regular intervals along the corresponding profile. The contactor 502" is controlled by an analog output of the communication interface 504". The communication interface 504" is connected, via a 560" junction box, to the electrical conductors 101 located on the main face side 100.1 of the prefabricated control line conduits.The 560'' junction boxes include elastic clamp-type contacts, for example of the lyre type, which are each engaged on one of the electrical conductors of the line through openings made at regular intervals along the corresponding profile.

[0030] The 400' and 400" power consumption units can be connected to the primary power and control lines or to the secondary power and control lines. Note on the figure 2 that several 400'' power consumption units can be connected to the same 500'' connection box (the same applies to 400'' power consumption units).

[0031] The communication interfaces, particularly the 300 and 504 series, are configured to communicate with each other via an AS-i Safety fieldbus. These communication interfaces are AS-i AC4S gateways. The communication interfaces associated with the power-consuming units control a relay, contactor, or variable frequency drive in the junction box to which the power input of the power-consuming unit is connected. The communication interfaces are also configured to: collect information relating to the status of the consuming unit, including for example the status of the circuit breaker, the operating status, the status of local controls (switch in automatic, off or manual position)... illuminate indicator lights corresponding to the status of the consuming unit...

[0032] Thus, each power-consuming unit is associated with a communication interface connected to the busbars of one of the prefabricated conduits of the primary or secondary control lines, and the 200 control PLCs are connected to two of the busbars of the prefabricated conduit of the primary control network via the 300 communication interface to communicate via a bus with the communication interfaces associated with the power-consuming units. The 200 PLCs are programmed to control the power-consuming units in order to implement the operating process of workshops S1, S2, and S3.

[0033] With reference to figures 6 à 9 The electrical conductors adjacent to face 100.2 of the control line profiles are used to form an Ethernet network linking an Ethernet interface located in each main low-voltage switchboard TGBT1, TGBT2 to an Ethernet interface located in the connection box of at least one of the consumer units having a communication card connected to said Ethernet interface. Face 100.2 of each profile is provided with openings 110 which are distributed at regular intervals along the profile and which each extend opposite the four electrical conductors 101", 101‴ dedicated to the Ethernet network ( figure 6 ). The two electrical conductors 101‴ have a break opposite each opening, and each opening can receive: either a first hood 600 ( figure 7 ) comprising two electrical connecting conductors 601, each having connectors at its ends (not visible on the figure 7 ) to connect to the ends of one of the interrupted electrical conductors 101''' directly above the first cover 600 to restore the continuity of the conductors 101‴, i.e. a second cover 700 ( figure 8 ) comprising four branch conductors 701 each having one end 701.1 provided with a connector (not visible on the figure 8 ) to be connected to one end of one of the interrupted electrical conductors 101‴ opposite the second cover 700 and one end 701.2 arranged to be connected to an Ethernet interface 720 comprising, for example, an SHDSL electronic circuit, i.e., a third cover 800 ( figure 9 ) which includes four 801 connectors and which is devoid of bonding or branch conductors.

[0034] The connectors of the 600, 700, 800 hoods allow both the fixing of the 600, 700, 800 hoods to the pipe and an electrical connection in the case of the 600 and 700 hoods.

[0035] When it is not necessary to connect a power-consuming unit to the Ethernet network, the opening is closed by a cover 600, and when a power-consuming unit must be connected to the Ethernet network, the opening is closed by a cover 700. The Ethernet-type computer network thus formed on the four electrical conductors 101'', 101‴ located on the side of face 100.2 is arranged to constitute a redundant loop. This can be seen at the figure 10 An example of a redundant loop Ethernet network implemented according to the invention. The ends of the electrical conductors 101", 101‴ are connected to Ethernet interfaces 120 comprising, for example, an SHDSL electronic circuit. Such a network can, for example, be used to transmit information from variable speed drives equipped with Ethernet interfaces to PLCs.

[0036] When no Ethernet network is required, the 110 openings are closed by the 800 covers.

[0037] Alternatively, another method of derivation is visible on the figure 2 and the figures 13 à 15 In this branching configuration, the loop includes an electrical connection block 650 which incorporates a TCP / IP interface and is equipped, on one side, with connectors for connecting to a connection module 130 to the electrical conductors of the pipe to be branched and, on the other side, with external connection connectors. For example, a computer or any other device capable of connecting to a TCP / IP network can be connected to the external connection connectors of this connection box 650.

[0038] Each 130 connection module is mounted either at one end of a pipeline or between two sections of a pipeline. In the latter case, the 130 connection module is connected to the electrical conductors of each section of pipeline by a terminal block 131.1, 131.2. Each terminal block 131.1, 131.2 has terminals connected, on one side, to the electrical conductors of the relevant conduit and, on the other side, to one end of cables 132.1, 132.2 having an opposite end connected to a set of female junction connectors generally designated as 133 such as the functional junction blocks manufactured by the company PHOENIX under reference 3246861. Here, two terminals of terminal block 131.1 and terminal block 131.2 are connected to the two electrical conductors dedicated to a first SHDSL network, two terminals of terminal block 131.1 and terminal block 131.2 are connected to the two electrical conductors dedicated to a second SHDSL network, two terminals of terminal block 131.1 and terminal block 131.Two terminals are connected to the two electrical conductors dedicated to the positive terminal of the 24 V power supply. Two terminals of terminal block 131.1 and terminal block 131.2 are connected to the two electrical conductors dedicated to the negative terminal of the power supply. The two terminals of terminal block 131.1 connected to the electrical conductors of the AS-i bus are directly connected to the two terminals of terminal block 131.2 connected to the electrical conductors of the AS-i bus by a cable without passing through a female junction connector 133.

[0039] Each female junction connector 133 comprises two terminals each connected, on one side, to one of the cables 132.1, 132.2 connected to one of the terminal blocks 131.1, 131.2 and, on the other side, to a terminal electrically connected to a female socket 135.1, 135.2. From the terminal connected to each female socket 135.1, 135.2 extends a conductive blade 136.1, 136.2 having an end segment bearing a contact 137.1, 137.2 and extending into a well 138. The well 138 extends between the female sockets 135.1, 135.2 parallel to them, and the end segment of the conductive blade 136.1, 136.2 extends opposite the end segment of the conductive blade 136.2. The conductive blades 136.1, 136.2 are elastically deformable from a first state in which the contacts 137.1, 137.2 are pressed against each other, ensuring electrical continuity between the two terminals of the female junction connector 133 ( figure 15 ) to a second state in which contacts 137.1, 137.2 are separated from each other, breaking the electrical continuity between the two terminals of the female junction connector 133 ( figure 14 ).

[0040] The connecting connector is shown in 660 on the figures 14 And 15Each 660 connection connector comprises a plurality of 661 unit connectors such as those manufactured by PHOENIX under reference 3246857 or 3246858. Each 661 unit connector comprises two plugs 662.1, 662.2 and for some a disconnect pin 663 made of electrically insulating material extending between the plugs 662.1, 662.2 parallel to them. Each of the 662.1, 662.2 pins of a unit connector 661 is intended to be received in one of the female sockets 135.1, 135.2 respectively of a female junction connector 133 and the disconnect pin 663, when present, is intended to be received in the well 138 of this female junction connector 133 to separate the contacts 137.1, 137.2 from each other and thus provide a bypass ( figure 14 The component(s) connected to the male connector 661 are then connected in series to the conductors of the cable to which the female junction connector 133 is connected. This allows for a branch connection and is used in particular for conductors dedicated to the SHDSL network.

[0041] Conversely, it is understood that when the unit connector 661 lacks a disconnect pin 663, connecting the unit connector 661 to a female junction connector 133 does not interrupt the electrical continuity between the terminals of said female junction connector 133. The component(s) connected to the unit connector 661 are then connected in parallel to the conductors of the cable to which the female junction connector 133 is connected. This is particularly useful for power supply conductors.

[0042] As previously mentioned, it is also possible to connect the electrical conductors of a primary conduit to the conductors of a secondary conduit by placing a 130 connection module on each conduit and connecting the two 130 connection modules to each other with a cable having a 660 connector at each end. Preferably, the 130 connection module is mounted at the end of the secondary conduit and at the other end the electrical conductors of the conduit are connected two by two to form a loop.

[0043] Advantageously, as shown on the figures 2 And 9 The distribution network includes a fire protection network comprising at least one primary fire protection line (LSI') connected to secondary fire protection lines (LSI''). The fire protection lines include conduits comprising: an electrically insulating profile; two pairs of identical electrical conductors (conductive bars) extending longitudinally in the profile and accessible on one of the opposite main faces of the profile via openings made at regular intervals in said main face.

[0044] A control center 1000 is connected to the electrical conductors of the primary fire safety line and fire alarms 901, fire detectors 902, bells 903 are connected to conductors of the primary and secondary fire safety lines by means of a junction box 900. The control center 1000 is connected to the PLCs of the main low voltage switchboards TGBT1, TGBT2 to send them, in case of fire alarm, a stop signal interpreted by the PLCs 200 so as to command a stop of the processes in progress by the PLCs 200 at the time of the alarm. In this case, the 200 PLCs can control a switchover of the TC1, TC2 transformers from one to the other, or to the GE generator set depending on whether one or both of the transformers are affected by a disaster, then switch off the transformer(s), or the TGBT, concerned by the fire detection.

[0045] The 1000 control center includes a programmable logic controller (PLC) programmed to collect fire signals from dedicated sensors connected to the 1000 control center and indicate to the 200 PLCs the area affected by the fire. More specifically, alarm sensors are preferably installed, associated with transformers TC1 and TC2, and the main distribution boards (MDBs). These sensors are either mounted directly on the transformers and MDBs, or located in the room housing each transformer and MDB, to provide fire, temperature, gas and / or gas pressure (dgpt2), and / or flood detection. These sensors are connected to the alarm processing PLC of the 1000 control center, which is configured to control, via the 200 PLCs, the replacement of the working transformer with the faulty transformer and / or the working MDB with the faulty MDB.The architecture of the installation based on prefabricated conduits is particularly interesting for the distance between transformers and TGBTs, and their mutual replacement without interruption of ongoing processes.

[0046] At least two of the electrical conductors of the primary and secondary fire safety lines are covered with thermal protection sheathing. The installation includes sirens distributed along the prefabricated fire safety conduits and connected to said electrical conductors covered with thermal protection sheathing.

[0047] It should be noted that the invention allows for several levels of backup with regard to main distribution boards: In the event of a failure of one of the 200 PLCs, the other (or one of the other) 200 PLC(s) takes over for the failed PLC. In the event of a failure of all 200 PLCs, process control is automatically taken over by the AC4S gateways of the communication interfaces. The AS-i AC4S gateways of the communication interfaces incorporate PLCs that, while less sophisticated than the 200 PLCs, are nevertheless designed to maintain the operation of the units to which the communication interfaces are connected when they have lost connection with the 200 PLCs. If the AS-i AC4S gateways fail, a degraded mode is entered in which an alert is sent to operators so that they can intervene via manual controls.

[0048] With reference to figures 16 à 18According to one embodiment of the invention, the pipes are fixed to vertical uprights 2001 which are themselves fixed to a wall and which support a fairing 2002. The fairing 2002 comprises a rear wall 2002.1, an upper cap 2002.2 and a front wall 2002.3 which is lower than the rear wall 2002.1. The cap 2002.1 is supported by brackets 2003 which are each fixed to one of the uprights 2001.

[0049] A flexible blade 2004, made of transparent thermoplastic material, extends longitudinally along the front wall 2002.3 of the fairing 2002 to form a protective curtain for the pipes against water spray. The upper longitudinal edge of the flexible blade 2004 is attached to a channel 2005 fixed to the fairing 2002 so as to press the upper longitudinal edge of the flexible blade 2004 against a rear surface of the front wall 2002.3 and to have its bottom pressed against a lower surface of the cowling 2002.2. The channel 2002 is thus open downwards and receives a strip of LEDs 2006 held in the channel 2005 by tabs 2007 cut into the side of the channel 2005 and folded over the LED strip 2006.The 2006 LED strip allows for the illumination of pipes and the boxes and other components attached to them, but also for illuminating the ground when the pipes are laid along a traffic path.

[0050] Rods 2008 are fixed to the arms 2003 by screws 2009 forming a pivot axis of the rods 2003 in a substantially horizontal plane between a retracted position under the cap 2002.2 and a protruding position from the front wall 2002.3 in which the rods 2008 hold the flexible blade 2004 raised to free access to the boxes and other components fixed to the pipes.

[0051] Of course, the invention is not limited to the embodiments described but encompasses any variant falling within the scope of the invention as defined by the claims.

[0052] In particular, the invention is applicable to any type of continuous process.

[0053] Alternatively, the communication interface is connected to a communication card connected to the consuming unit.

[0054] The installation may include a single input transformer or more than two transformers mounted in parallel to connect the input of the main low-voltage switchboard to the power supply.

[0055] Instead of using transformers as power inputs, it is possible to use a generator set or a cogeneration system.

[0056] At least one of the power-consuming units includes an electric motor connected to a variable frequency drive (VFD), which is itself connected to the junction box. The communication interface is connected to the VFD to control it. Alternatively, all or some of the power-consuming units may not have a VFD, or even a motor.

[0057] At least one power-consuming unit may be connected to the prefabricated busbar of one of the primary power lines and to the prefabricated busbar of one of the primary control lines. Conversely, the power-consuming units could all be connected to the secondary lines or all connected to the primary lines.

[0058] Prefabricated control or power line conduits may have two main opposing faces and include eight conductive bars accessible by half on each of the main faces.

[0059] At least a portion of the prefabricated control line piping may include a remote control line.

[0060] At least a portion of the prefabricated control line conduits shall include at least two electrical conductors used to form a computer network of the Ethernet type, preferably in a redundant ring configuration.

[0061] Alternatively, it is possible to replace the electrical conductors 101'', 101‴ with optical fibers.

[0062] Dedicated conduits can be used for the computer network, which may use a protocol other than Ethernet.

[0063] In the case of small installations, it is possible to do without a master PLC by using only an AC4S PLC integrated with the AS-i interface.

[0064] Alternatively, it is possible to control a motor's drive directly via the Ethernet network when said drive has an integrated Ethernet card.

[0065] In the case of small installations, secondary lines can be omitted.

[0066] The primary and secondary pipes can be different, as in the described embodiment, or identical to each other, for example of the CANALIS KS type. The latter option has the advantage of allowing the use of the same connection boxes throughout the network.

[0067] Any type of connection can be used to join prefabricated pipes together. However, a female connection module is preferred; this module is placed between one pipe section and a second pipe section and includes: First terminals connected to the electrical conductors of the first section of conduit and second terminals connected to the electrical conductors of the second section of conduit; first sockets, each connected to one of the first terminals, and second sockets, each connected to one of the first terminals, for receiving first and second plugs of a male connector; and, advantageously, means for allowing series or parallel connection to the conductors of the first and second sections of conduit. Preferably, the means for series or parallel connection comprise: first conductive blades, each connected to one of the first terminals, each having a first end segment extending into a well parallel to the sockets and carrying a first contact; second conductive blades, each connected to one of the second terminals, each having a second end segment extending into the well and carrying a second contact opposite the first contact; disconnecting pins carried by the male connecting connector and each extending between two plugs to be engaged in the well so as to separate the contacts from each other, the conductive blades being elastically deformable from a first state in which the contacts 137.1, 137.2 are applied against each other ensuring electrical continuity between the two terminals to a second state in which the contacts are separated from each other breaking the electrical continuity between the two terminals.

[0068] Although the invention has been described in application to a water treatment plant, the invention is applicable to any type of plant and for example a waste disposal plant for the supply and control of sorting machines, conveying machines... by providing for example emergency stops for each machine.

[0069] It is possible to use as fieldbuses, AS-i buses (the AS-i or AS-Interface interface is described in the international standard IEC 62026-2: 2015) or others, such as the DUPLINE buses from the CARLO GAVAZZI company and more specifically the DUPLINE SAFE bus.

[0070] Alternatively, in the event of a failure of the master PLC 200, it is possible that one of the AC4S gateways may be programmed to replace the master PLC and to control at least one other of the AC4S gateways.

Claims

1. Electrical installation comprising a low-voltage main switchboard (TGBTl, TGBT2) having at least one inlet connected to a power supply (RAl, RA2), a distribution network (RD) connecting at least one outlet of the low-voltage main switchboard to consumer units (400', 400''), the distribution network comprising a power network having at least one power line (LPl, LPl') comprising at least one prefabricated trunking (100) incorporating busbars, characterised in that the distribution network comprises: a control network comprising at least one control line (LCl, LC'1), the consumer units each having at least one power inlet connected to a junction box (500', 500'') to busbars of the prefabricated power trunking, characterised in that each consumer unit is associated with a communication interface (504'') connected to the busbars of the prefabricated trunking of the control line, at least one controller (200) being connected to two of the busbars of the prefabricated trunking of the control line via a communication interface (300) arranged to communicate, via an AS-i-type fieldbus of Safety subtype, with the communication interfaces associated with the consumer units.

2. Installation according to claim 1, wherein the communication interface (504'') of at least one of the consumer units (400'') controls a relay of the junction box (500") to which the power inlet of the consumer unit is connected.

3. Installation according to claim 1, wherein the communication interface (504'') is connected to a communication card of the consumer unit.

4. Installation according to any one of the preceding claims, wherein two of the busbars of at least a part of the prefabricated trunking of the control network are connected to an energy storage device (ESl, ES2).

5. Installation according to any one of the preceding claims, wherein at least a portion of the prefabricated trunking of the control network comprises at least two busbars (101" , 101‴) used to form an Ethernet network.

6. Installation according to claim 5, wherein the Ethernet network is formed on four busbars (101", 101‴) so as to form at least one redundant loop.

7. Installation according to claim 6, wherein the loop comprises an electrical terminal block that incorporates a TCP / IP interface and is provided with connectors for connection to the busbars and with external link connectors.

8. Installation according to claim 5, wherein at least the prefabricated trunking (100) of the control line are provided with openings (110) distributed along their length, each opening extending opposite the four busbars (101'', 101‴) dedicated to the Ethernet network; two of the busbars are opposite each opening, and each opening receives either a first cover (600) comprising linking conductors (601) interrupted at the opening, the first cover possibly having two ends fitted with connectors to connect to the ends opposite one of the interrupted busbars aligned with the first cover, or a second cover (700) comprising four branch conductors (701), each having an end fitted with a connector for connection to an end of one of the interrupted busbars opposite the second cover.

9. Installation according to any one of the preceding claims, wherein the distribution network comprises a fire safety line comprising at least one prefabricated trunking incorporating busbars, a fire control panel (1000) being connected to the busbars of the fire safety line and fire detectors and / or fire alarms being connected to busbars of the fire safety line.

10. Installation according to claim 9, wherein at least two of the busbars of the fire safety line are covered with a thermal protective sheath, the installation comprising sirens distributed along the fire safety lines and connected to said busbars covered with the thermal protective sheath.

11. Installation according to any one of the preceding claims, wherein at least one of the consumer units comprises an electric motor connected to a variable-speed drive which is itself connected to the junction box and the communication interface is connected to the drive to control it.

12. Installation according to any one of the preceding claims, comprising at least two remote transformers, and two remote low-voltage main switchboards each connected to one of the transformers such that they are interchangeable with each other.

13. Installation according to the previous claim, comprising an alarm processing controller connected to sensors associated with the transformers and the low-voltage main switchboards and arranged to command the substitution of one transformer for another and / or of one low-voltage main switchboard for another.

14. Installation according to the previous claim, arranged so that - in the event of failure of the controller of one of the low-voltage main switchboards, the controller of the other low-voltage main switchboard takes over for the failed controller - in the event of failure of all the controllers of the low-voltage main switchboards, process control is automatically taken over by the communication interfaces, said interfaces each incorporating an AC4S-type gateway arranged to maintain the operation of the units to which the communication interface is connected when it has lost the link with the controllers ; - if the AC4S-type gateways fail, an alert is sent to an operator so that the operator can intervene on manual controls.

15. Installation according to any one of the preceding claims, comprising at least one female connection module which is arranged between a first section of prefabricated trunking and a second section of prefabricated trunking and which comprises : - first terminals connected to the electrical conductors of the first section of prefabricated trunking and second terminals connected to the electrical conductors of the second section of prefabricated trunking; - first sockets each connected to one of the first terminals and second sockets each connected to one of the second terminals to receive first plugs and second plugs of a male connector; - means to allow a series or parallel connection to the conductors of the first trunking section and of the second trunking section.

16. Installation according to claim 15, in which the means for series or parallel connection comprise: - first conductive blades each connected to one of the first terminals and each having a first end section extending into a well parallel to the sockets and bearing a first contact; - second conductive blades each connected to one of the second terminals and each having a second end section extending into the well and bearing a second contact opposite the first contact; - isolating pins carried by the male mating connector and each extending between two prongs to be engaged in the well so as to separate the contacts from one another, the conductive blades being elastically deformable from a first state in which the contacts (137.1, 137.2) are pressed against one another ensuring electrical continuity between the two terminals to a second state in which the contacts are separated from one another breaking the electrical continuity between the two terminals.

17. Installation according to any one of the preceding claims, in which the power network comprises a primary power line (LPl) comprising at least one prefabricated trunking (100) incorporating busbars to which are connected busbars of at least one prefabricated trunking of a secondary power line (LPl') and the control network comprises at least one primary control line (LC1) comprising at least one prefabricated trunking incorporating busbars to which are connected busbars of at least one prefabricated trunking of a secondary control line (LC'1), each consumer unit being associated with a communication interface (504'') connected to the busbars of the prefabricated trunking of the secondary control line, at least one controller (200) being connected to two of the busbars of the prefabricated trunking of the primary control line via a communication interface (300) to communicate via a bus with the communication interfaces associated with the consumer units.