Method for testing electrical continuity of a power bus of a safety system and corresponding safety system

Abstract

The present invention relates to a method for testing the electrical continuity of a power supply bus of a building or vehicle security system and a corresponding security system, said method comprising a test phase during which the power supply to one of the pairs of terminals of a central control system each serving to supply a power supply bus of remote security modules is temporarily cut off, and is characterized in that, during this cut-off, a discharge of the power supply bus is carried out via an electronic component configured to connect to each other the electrical cables of the power supply bus configured to be coupled to said terminals whose power supply has been cut off. Figure 1

Description

Title of the invention: Method for testing electrical continuity of a power supply bus of a safety system and corresponding safety system

[0001] The invention falls within the general framework of safety systems and methods for buildings or vehicles (for example, aircraft, boats, etc.), particularly in the event of a fire.

[0002] Safety systems typically comprise a set of components intended to secure the building or vehicle they equip in the event of detection of a problem that may affect the safety of the building / vehicle or its occupants. A safety system usually comprises a central control system, hereinafter referred to as SCC, connected to one or more safety devices, usually referred to as “Safety Actuated Device”, hereinafter referred to as DAS. The DAS is a device that can be operated remotely by the SCC. The present invention relates more particularly to the control of such DAS by the SCC.

[0003] The DAS is typically a device that can be operated manually or automatically in order to trigger an action inside a building or vehicle in the event of a safety problem, for example related to a fire. These include, for example, notification devices such as visual and / or audible diffusers, fire doors, emergency exit locking and unlocking devices, smoke extraction fans, etc. In the following, we will take the example of DAS installed in a building. However, the present invention is not limited to an application to buildings.

[0004] A DAS can generally be characterized by two states: an active state, in which the DAS is found when a security problem has been detected, and an inactive state, in which the DAS is found when no security problem has been detected. Generally speaking, the change of state of the DAS directly contributes to the securing of the building in which it is installed. The transition from the inactive state to active and / or from the active state to inactive can be managed automatically by the DAS itself (standalone DAS), or controlled by the SCC in charge of securing the building equipped with said DAS. In state-of-the-art security systems, the SCC is the component centralizing the information relating to the security of the building. It makes it possible to remotely control, either automatically or manually, the change of state of one or more DAS, i.e.their respective activation or inactivation, depending on one or more security problems detected, or during tests of said control system, and also allows to receive, in a cen . internationalized, information relating to the activation status (active / inactive) of each DAS connected to the SCC.

[0005] The DAS can be directly connected to the SCC or indirectly via a remote control module, hereinafter referred to as MCD. The MCD is typically an addressable electronic module that allows the SCC to control or manage one or more DAS, for example by enabling a predefined group of DAS to be activated via a single MCD, monitoring the activation status of the DAS, etc. This makes it possible in particular to cover a predefined area of ​​a building via a single MCD. Hereinafter, both the DAS and one or more DAS connected to an MCD will be collectively referred to as a “security module”, hereinafter referred to as MMS. An MMS thus comprises at least one DAS whose activation status (active vs. inactive) can be controlled and / or verified by the SCC.An MMS may thus comprise, for example, a single DAS (in this case, the DAS is directly connected to the SCC), or an MCD connected to a DAS (in this case, the DAS is connected to the MCD which is, in turn, connected to the SCC), or an MCD connected to several DAS (in this case, each of the DAS is connected to the MCD and the MCD is connected to the SCC). Preferably, an MMS comprises at least one MCD connected to at least one DAS.

[0006] According to the state of the art, the MMS are typically mounted in series, an electrical power supply bus connecting the MMS and connecting them to the SCC. The power supply bus makes it possible to supply the energy necessary for the operation of each of the MMS while allowing a simple architecture when it is installed in a building. In order to guarantee the safety of the power supply of the different MMS, the power supply bus typically describes a power supply loop having the SCC as its starting point and also the SCC as its arrival point, the MMS being connected in series between said starting point and said arrival point.In this configuration, the starting point comprises a pair of electrical supply terminals S1+ and SI-, the arrival point also comprises a pair of electrical supply terminals S2+ and S2-, where S1+ and S2+ are connected to the same voltage supply terminal V+, and SL and S2 are connected to the same other reference voltage supply terminal V-. The power supply bus comprises a pair of conductive cables connecting the MMSs in series and comprising a first electrical cable connecting S1+ to S2+ and a second electrical cable connecting SI- to S2-. This configuration makes it possible to guarantee the power supply of all the MMSs of the power supply loop in the event of a break in electrical continuity at a point of said loop. However, to guarantee the proper functioning of the safety system, it is necessary to ensure that no electrical break is present in said loop, i.e.to check the electrical continuity of the power bus.

[0007] To this end, a first solution consists of periodically checking, for example every 15 s or more, that such a break, corresponding to an open circuit condition for the power loop, is not present. This verification is normally carried out by disconnecting, for a short period of time (typically less than 500 ms), either at the starting point or at the origin point, the first and second electrical cables from their respective power terminals, and measuring the voltage difference between said first and said second cables at the ends which have been disconnected from their terminals. If no break is present in the power loop, then said voltage difference should be equal to that measured at said ends when the first electrical cable and the second electrical cable are connected to their respective terminals.On the other hand, in the event of a power outage within the power loop, said voltage difference will then be smaller than that measured at said ends when the first electrical cable and the second electrical cable are connected to their respective terminal.

[0008] A problem observed during this verification is linked to the length of the electrical cables. Indeed, the pair of conductor cables of the power bus can sometimes extend in a building over very great lengths, so that the measurable electrical capacitance at said ends becomes non-negligible during said verification and prevents a sufficient reduction of said voltage difference during the disconnection of said electrical cables from their respective terminal. Indeed, the short period of time during which the verification is carried out does not make it possible to obtain a value of the voltage difference at said ends of said cables which is substantially different from the value of the voltage difference obtained when said ends are connected to their respective terminal.

[0009] In order to avoid this problem while ensuring the safety of the building, a second solution consists of electrically connecting only one of the pairs of electrical power supply terminals to the electrical cables of the power bus, the other pair of terminals being only connected to said cables when a power outage is detected. However, this solution has the disadvantage of creating a significant voltage drop in the MMS furthest from the pair of terminals to which the electrical cables of the power loop were connected before the outage, this voltage drop being caused in particular by the length of the pair of conductive cables (their resistance can typically reach 4Q) and the power supply current used (typically 4A).In addition, this solution generates significant power losses for the power supply bus which are of the order of 64W, approximately double the power loss typically measured for the first solution.

[0010] An aim of the present invention is to propose a method for verifying the electrical continuity of the power supply bus and a corresponding safety system. respondent who solve the disadvantages of the above-mentioned solutions.

[0011] For this purpose, a test method and a corresponding safety system are provided in the present disclosure.

[0012] The present invention thus relates more particularly to a system for securing a building or a vehicle, said system comprising:

[0013] - a plurality of MMS connected in series;

[0014] - an electrical power supply bus comprising a pair of cables electrical cables extending from a first end to a second end, said pair of cables being configured to connect the MMS in series between said first end and said second end in order to enable power to be supplied to the latter;

[0015] - an SCC comprising a first pair of power supply terminals and a second pair of power supply terminals, the first and second pairs of terminals being configured to be connected to the same voltage source, the first pair of terminals being connected to said voltage source by means of a first system of switches making it possible to connect or disconnect the terminals of said first pair from the voltage source, the power supply terminals of the first pair being configured to be connected to the first end of the pair of electrical cables and the power supply terminals of the second pair being configured to be connected to the second end of said pair of electrical cables so as to allow power to be supplied to the bus from each of its ends.The SCC may in particular comprise at least one processor and one memory, and / or one or more microcontrollers, for analyzing signals and / or sending a control or command signal, for example to control the switch system or an electronic component or an electronic circuit of the safety system; .

[0016] the safety system according to the invention being characterized in that, at said first end, said electrical cables are configured to be connected to each other by means of an electronic component or an electronic circuit, for example by means of a resistor, configured to discharge the power supply bus during a test phase during which the SCC is configured to temporarily disconnect, by command of said first switch system, the terminals of said first pair from said voltage source.

[0017] The present invention thus also relates to a method for testing electrical continuity of the electrical power supply bus of said building or vehicle safety system previously described. Said method comprising a test phase comprising a temporary disconnection, by control of said switch system by the SCC, of ​​said voltage source of said power supply terminals of the first pair, the power supply of the terminals of the second pair being notably maintained during said test, i.e. during said temporary disconnection, and is characterized in that, during this temporary disconnection, a discharge of the power supply bus is carried out via an electronic component or an electronic circuit, for example via a resistor, configured to connect the electrical cables of said first end to each other.

[0018] Preferably, said electronic component or circuit, for example said resistor, is mounted in series with a switch controllable by the SCC in order to cut, at said first end, the electrical connection of said electrical cables with each other outside of said test phase.

[0019] In particular, during said test phase, the SCC is configured to measure, at said first end, a first voltage between said electrical cables of said first end, then to automatically detect an electrical discontinuity in the power supply bus from said first voltage, and finally to automatically generate an alert in the event of detection of such a discontinuity.

[0020] Preferably, in order to automatically detect said electrical discontinuity, the SCC is configured to calculate a difference between the value of said first voltage and a nominal voltage value, said nominal value being obtained by measuring the voltage between said electrical cables of said first end when said voltage source is electrically connected to said power supply terminals of the first pair, said alert being generated if said difference is greater than a predefined threshold value.

[0021] Preferably, the second pair of power supply terminals is also connected to said voltage source by means of a second switch system configured to connect or disconnect the power supply terminals of said second pair from the voltage source. In particular, the first and second switch systems can be independently controlled and / or commanded by the SCC.

[0022] Preferably, at said second end, said electrical cables of the power supply bus are configured to be connected to each other by means of another electronic component or circuit, for example another resistor, configured to discharge the power supply bus during another test phase during which the SCC is configured to temporarily disconnect, by control of said second system of switches, the terminals of said second pair from said voltage source. Said other electronic component or circuit, for example said other resistor, is in particular mounted in series with another switch controllable by the SCC, in particular so as to cut, at said second end, the electrical connection of said electrical cables to each other outside of said other test phase.

[0023] Other features and advantages of the present invention will be better understood from the following description, read in conjunction with the accompanying drawings in which identical references have been used to designate similar objects:

[0024] [Fig.l] illustrates a preferred wiring diagram of a safety system according to the invention;

[0025] [Fig.2] illustrates another preferred wiring diagram of a system for implementing security according to the invention;

[0026] [Fig.3] illustrates a flowchart showing a preferred implementation of the method according to the invention.

[0027] Figures 1 to 3, presented in detail below and the various embodiments used to describe the principles of the present invention are given for illustration purposes only and should not in any way be interpreted as limiting the scope of the disclosure.

[0028] Figures 1 and 2 illustrate preferred embodiments of the system 100 for securing a building or vehicle. The latter comprises:

[0029] - a plurality of MMS 101 connected in series. Each MMS 101 according to the invention may comprise at least one DAS 11 characterized by two states, an active state and an inactive state, the transition from the inactive state to active being configured to trigger an action to secure said building or vehicle. Preferably, each or a plurality of MMS 101 comprises at least one MCD 10, each MCD being able to be connected to one or more DAS 11. The MCD is in particular configured to allow control of the DAS(s) to which it is connected by means of an SCC 110 and / or a verification of their state via said SCC 110. The DAS and the MCDs, as well as their interaction with the SCC 110 are well known to those skilled in the art and do not require further explanation here;

[0030] - an electrical power supply bus 102. The latter comprises a pair of electrical cables 103 extending from a first end 103A to a second end 103B. The pair of cables is configured to connect the MMS 101 in series between said first end 103A and said second end 103B in order to supply power to the latter;

[0031] - said SCC 110 configured to remotely control and / or command each of said DAS 11. The SCC 110 according to the invention comprises in particular a first pair 111 of power supply terminals comprising the terminals S1+ and S1-, and a second pair of power supply terminals comprising the terminals S2+ and S2-. The first and second pairs of terminals are configured to be connected to the same voltage source 120. In particular, the first pair 111 of terminals is connected to said voltage source 120 by means of a first system of switches 113 comprising the switches T1 and T1'. This first system of switches 113 makes it possible to connect or disconnect from the voltage source 120 the terminals S1+ and S1- of said first pair. Optionally, the second pair 112 is connected to said voltage source 120 by means of a second switch system 114 comprising the switches T2 and T2'. The second switch system 114 makes it possible to connect or disconnect from the voltage source 120 the terminals S2+ and S2- of said first pair. For example, the terminal S1+ is connected to a positive pole V+ of said voltage source 120 via the switch T1 and the terminal S1- is connected to a negative pole V- of said voltage source 120 via the switch T1'. Optionally, the terminal S2+ is connected to said positive pole V+ via the switch T2 and the terminal S2- is connected to the negative pole via the switch T2'.The switches of each of said switch systems 113 and 114 can be controlled and / or commanded by the SCC 110 so as to control the power supply of the power bus, in particular during a test phase as detailed below. According to the wiring illustrated in FIGS. 1 and 2, the first end 103A of the cables 103 is connected to the first pair 111 of power supply terminals and the second end 103B to the second pair 112. For example, one of said cables 103 is connected to the terminal S1+ at said first end 103A and to the terminal S2+ at said second end 103B, while the other of said cables 103 is connected to the terminal SI- at said first end 103A and to the terminal S2- at said second end 103B.

[0032] Unlike the safety systems of the prior art, the present system 100 comprises, at said first end 103A, an electronic component such as a resistor 104 configured to connect said cables 103 of said pair of electrical cables. In other words, if said electrical cables 103 connect N MMS 101 in series, one of the cables being configured to be connected at each of its ends to the positive pole V+ and the other of said cables being configured to be connected at each of its ends to said negative pole V-, then the system according to the invention comprises, after the Nth MMS 101, said electronic component, for example a resistor, configured to have one of its terminals connected to one of the cables 103, and the other of its terminals connected to the other of said cables 103.This connection, by means of said electronic component such as the resistor 104, of said power cables to the end of the power bus makes it possible to discharge the power bus during said test phase. Preferably, said electronic component, for example said resistor 104, is connected in series with a switch 105 controllable by the SCC 110 so as to be able to control the connection of said cables 103 with each other by means of the SCC 110. For example, the resistor 104 has one of its terminals connected to one of the cables 103, and the other of its terminals connected to a terminal of the switch 105, said switch 105 having the other of its terminals connected to the other of said cables 103.

[0033] The operation of the system 100 according to the invention will now be described in more detailed manner in connection with [Fig. 3] describing a preferred embodiment of the method 300 according to the invention. In the following, we will consider a preferred embodiment for which said electronic component is the resistor 104. However, this resistor 104 could be replaced by any electronic component capable of discharging the power supply bus 102 when the power supply to one of its ends is cut off. Said method 300 comprises an implementation of a test of the electrical continuity of the power supply bus 102 by means of the safety system 100 as described previously.

[0034] In nominal operation, the system according to the invention supplies power to the bus 102 at each of its ends 103A and 103B. In the case of the wiring of [Fig.l], this means that the switches Tl and Tl' are closed and current can flow between the positive pole V+ and the terminal S1+ as well as between the terminal S1- and the negative pole V-. In the case of [Fig.2], the switches of the first and second switch system are all closed, allowing power to be supplied to the bus 102 from each of its ends. Additionally, the switch 105 is open in order to reduce a power loss that would come from a continuous connection of the ends of the cables 103 via the resistor 104.

[0035] In order to carry out said test, the SCC 110 is configured to temporarily disconnect 301 at least one of the ends of the bus 102 from said voltage source, said end which is disconnected in front being an end which is equipped with the resistor 104 according to the invention, the other end remaining connected to the voltage source during said test in order to power said bus 102 by only one of its ends. If each of the ends of the bus 102 is equipped with a resistor according to the invention, then the SCC can choose to test said bus by disconnecting one or other of its ends from said voltage source, for example by carrying out a first test by disconnecting one of the ends, then a second test by disconnecting the other of the ends.

[0036] In the wiring configuration of [Fig.l], the SCC 110 is therefore configured to temporarily disconnect, by command of said first switch system 113, the terminals of said first pair 111 from said voltage source 120, the other terminals, i.e. the terminals of the second pair remaining powered by the power source in order to power the bus 102 by only one of its ends. For example, the switches T1 and T1' are both opened by the SCC in order to carry out the test. The same principle applies mutatis mutandis to [Fig.2]. However, if in [Fig.2], a resistor is also mounted at the end 103B in order to connect cables 103, then the SCC 110 can automatically choose to disconnect either the first end or the second end from the power source, the other end remaining connected to the voltage source for the test phase. In other words, during said test, at least one of the ends 103A or 103B is supplied with power, while the power supply of the other end, which must be an end of the bus comprising a resistor according to the invention, is cut off. In order to open or respectively close the power supply of one of the ends of the bus, the SCC 110 can send a control signal to the switch system intended to connect or disconnect said end to the voltage source, said control signal being configured to open or respectively close the circuit controlled by said switch system. Preferably, the same control signal is used to control the switch 105 mounted in series with the resistor 104. However, while this signal is configured to disconnect from the voltage source the end where the resistor is mounted, it will be configured to connect the resistor to said cables 103 of said end.

[0037] Indeed, during the period of time during which one of the ends of the power supply bus is disconnected from the voltage source, i.e. during the power cut of one of the ends of the bus while the other end remains powered, the method according to the invention is configured to discharge 302 said power supply bus via said resistor. And if the latter is connected in series with a switch, as illustrated in [Fig.2], the SCC 110 will then be configured to close the switch so as to create electrical continuity between the electrical cables of the end having been disconnected from the terminals whose power supply has been cut, this electrical continuity being ensured by the switch in the closed position and the resistor connecting the cables of said end with each other.Therefore, as explained previously, the SCC 110 is configured to control the state of the switches of the switch system 111 and the state of the switch 105 so that the switches of the switch system 113 are opposite to the state of the switch 105 during said discharging of the power supply bus. Advantageously, the series connection of said resistor 104 with said switch 105 controllable by the SCC 110 makes it possible to cut, at said first end 103A, the electrical connection of said electrical cables 103 with each other outside of said test phase and to connect said electrical cables of the first end during said test phase.

[0038] Preferably, the method according to the invention further comprises a measurement 303, by the SCC 110, at the end whose power supply has been cut off, for example at said first end 103A according to FIGS. 1 and 2, of a first voltage between said electrical cables 103 of said end whose power supply has been cut off, for example between the cables of said first end according to FIGS. 1 and 2.

[0039] Said measurement is preferably followed by a detection 304, by the SCC, of ​​an electrical discontinuity in the power supply bus from the value of said first voltage measured previously, then an automatic generation 305 of a alert, by the SCC, in the event of detection of such discontinuity.

[0040] In order to detect the presence of said discontinuity, the SCC notably comprises a memory in which a nominal voltage value and a predefined threshold value are recorded. Said nominal voltage value is for example obtained periodically by the SCC by measuring the voltage between said electrical cables of said first end when said voltage source is electrically connected to said power supply terminals of the first pair and of said second pair, said periodic measurement being recorded in the memory of the SCC. The threshold value is typically a value defined by an operator and stored in said memory. The alert is therefore preferentially generated if the difference between the nominal value and the value of said first voltage is greater than said threshold value.

[0041] In conclusion, and in order to summarize the general concept of the present invention as illustrated by the preferred embodiments of Figures 1 and 2, at least one of the first pair 111 and the second pair 112 is connected to the voltage source 120 via a system of switches 113, 114. According to the invention, among the pairs of terminals connected to the voltage source 120 via a system of switches 113, 114, at least one is configured to be connected to one end of the power supply bus 102 whose cables 103 are connectable to each other by means of an electronic component (e.g. the resistor 104), or an electronic component connected in series with a switch 105 (e.g. the resistor 104 connected in series with the switch 105), in order to discharge said power supply bus during said test phase.During the latter, one of the ends of the power supply bus is disconnected from the voltage source, while the other end is kept connected to the voltage source so as to supply the bus with energy only by the end that remained connected to said voltage source. According to the present invention, the end that is disconnected during the test phase is an end comprising said electronic component (e.g. said resistor), or said electronic component mounted in series with said switch. This makes it possible to discharge the power supply bus before carrying out a voltage measurement at the terminals of said electronic component, or at the terminals of the circuit comprising the electronic component mounted in series with said switch, said measurement, carried out during or after discharging the bus, making it possible to improve the detection of an electrical continuity fault within the power supply bus.

Claims

Claims

1. System (100) for securing a building or vehicle, said system (100) comprising: - a plurality of safety modules (101), hereinafter “MMS”, mounted in series; - an electrical power supply bus (102) comprising a pair of electrical cables (103) extending from a first end (103A) to a second end (103B), said pair of cables (103) being configured to connect the MMS (101) in series between said first end (103A) and said second end (103B) in order to supply the latter with power; - a central control system (110), hereinafter "CCS", comprising a first pair (111) of power supply terminals and a second pair (112) of power supply terminals configured to be connected to the same voltage source (120), the first pair (111) of terminals being connected to said voltage source (120) by means of a first system (113) of switches making it possible to connect or disconnect from the voltage source (120) the terminals of said first pair (111), the power supply terminals of the first pair (111) being configured to be connected to the first end (103A) of the pair of electrical cables (103) and the power supply terminals of the second pair (112) being configured to be connected to the second end (103B) of said pair of electrical cables (103) so as to allow a power supply of the bus (102) from each of its ends (103A, 103B); the safety system (100) being characterized in that, at said first end (103A), said electrical cables (103) are configured to be connected to each other by means of an electronic component (104) configured to discharge the power supply bus (102) during a test phase during which the SCC (110) is configured to temporarily disconnect, by control of said first switch system (113), the terminals of said first pair (111) from said voltage source (120).

2. System (100) according to claim 1, for which said electronic component (104) is connected in series with a switch (105) controllable by the SCC (110) in order to cut, at said first end (103A), the electrical connection of said electrical cables (103) to one another. with the other outside of said test phase.

3. System (100) according to claim 1 or 2, for which, during said test phase, the SCC (110) is configured to - measure, at said first end (103A), a first voltage between said electrical cables (103) of said first end (103A); then to - automatically detect an electrical discontinuity in the power supply bus (102) from said first voltage; and - automatically generate an alert in the event of detection of such a discontinuity.

4. System (100) according to claim 3, wherein, in order to automatically detect said electrical discontinuity, the SCC (110) is configured to calculate a difference between the value of said first voltage and a nominal voltage value, said nominal value being obtained by measuring voltage between said electrical cables (103) of said first end (103A) when said voltage source (120) is electrically connected to said power supply terminals of the first pair (111), said alert being generated if said difference is greater than a predefined threshold value.

5. System (100) according to one of claims 1 to 4, wherein the second pair (112) of power supply terminals is connected to said voltage source (120) by means of a second switch system (114) configured to connect or disconnect the power supply terminals of said second pair (112) from the voltage source (120).

6. System (100) according to claim 5, wherein, at said second end (103B), said electrical cables (103) are configured to be connected to each other by means of another electronic component configured to discharge the power supply bus (102) during another test phase during which the SCC (110) is configured to temporarily disconnect, by control of said second switch system (114), the terminals of said second pair (112) from said voltage source (120).

7. System (100) according to claim 6, wherein said other electronic component is connected in series with another switch controllable by the SCC (110).

8. Method for testing electrical continuity of an electrical power supply bus (102) of a power system (100)

9. security of a building or a vehicle, said system (100) comprising: - a plurality of safety modules (101), hereinafter “MMS”, mounted in series; - said electrical power supply bus (102) comprising a pair of electrical cables (103) extending from a first end (103A) to a second end (103B), said pair of cables (103) being configured to connect in series the MMS (101) between said first end (103A) and said second end (103B) in order to supply the latter with power; - a central control system (110), hereinafter "CCS", comprising a first pair (111) of power supply terminals and a second pair (112) of power supply terminals configured to be connected to the same voltage source (120), the first pair (111) of terminals being connected to said voltage source (120) by means of a first switch system (113) making it possible to connect or disconnect from the voltage source (120) said terminals of said first pair (111), the power supply terminals of the first pair (111) being configured to be connected to the first end (103A) of the pair of electrical cables (103) and the power supply terminals of the second pair (112) being configured to be connected to the second end (103B) of the pair of electrical cables (103) so as to allow a power supply of the bus (102) from each of its ends (103A, 103B); said test method comprising a test phase (300) comprising the following steps: - a temporary disconnection (301), by control of said switch system (113) by the SCC (110), of said voltage source (120) of said supply terminals of the first pair (111); and being characterized in that, during this temporary disconnection, a discharge (302) of the power supply bus (102) is carried out via an electronic component (104), such as a resistor, configured to connect the electrical cables (103) of said first end (103A) to each other. Method according to claim 8, comprising a control, by the SCC (110), of a switch (105) connected in series with said electronic component (104) in order to cut, at said first end (103A), the electrical connection of said electrical cables (103) with each other in outside of said test phase (300).

10. Method according to claim 8 or 9, comprising: - a measurement (303), by the SCC (110), at said first end (103A), of a first voltage between said electrical cables (103) of said first end (103A); then - a detection (304), by the SCC (110), of an electrical discontinuity in the power supply bus (102) from the value of said first voltage; - an automatic generation (305) of an alert in the event of detection of such a discontinuity.

11. Method according to claim 10, wherein said detection (304) comprises a calculation of a difference between the value of said first voltage and a nominal voltage value, said nominal value being obtained by measuring voltage between said electrical cables (103) of said first end (103A) when said voltage source (102) is electrically connected to said power supply terminals of the first pair (111), said alert being generated if said difference is greater than a predefined threshold value.

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