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Container allowing to store and deliver garments to passengers Disclosure Number: IPCOM000249532D
Publication Date: 2017-Mar-02
Document File: 5 page(s) / 224K

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The invention offers a new type of application for aircraft container allowing to free space in cabin. The container will have as unique function to offer a wardrobe. Passengers instead of storing their coats in cabin will let it in the wardrobe container on ground just before embarking The container will be able to extend for offering more space to passenger to hinge their clothes and to retract to minimize its size. A system like RFID is provided to help passengers to retrieve easily and rapidly their clothes.

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This paper relates to a protection system for a high voltage circuit. The protection system

comprises a main switch that is aimed at cutting the power line supplying current to a load in case

of overcurrent, and an alternative switch that is activated only if the main switch were to fail.



A main switch is constituted by a SSPC system (Solid state power controllers) that provides

electrical protection to a secondary circuit supplied in current from a primary circuit (See figure 1).

The SSPC system comprises power electronics semiconductors switches such as MOS power

transistors. In normal conditions (no overcurrent in the power line connecting the primary circuit 10

and the secondary circuit), the power transistors switches are closes. The electrical protection is

calibrated to open the power transistors switches according to a fast trip curve command

depending on the current measured the system and on the time.

To reduce electrical arc thermal impacts (so to avoid damage to environment, to other lines, and

risk of high voltage propagation up to equipment), one solution is to minimize the trip time of the 15

main switch using a fast trip main SSPC system. A fast trip SSPC system has typically a trip time

below 100 ms.

Figure 1: Single switch arranged on the power line to protect a secondary circuit.


A problem encountered in a SSPC system is that its failure mode is generally a short circuit in its

main switch components.

When this type of failure occurs, it is no longer possible to control the secondary line opening which

will remove the overcurrent protection and may lead to destructive overheating of the secondary

circuit lines in the event of problems with the equipment which might even result in damaging the 5

primary line.

The certification authorities request a backup to a single SSPC system. A well-known solution is to

add a fuse in serial with the single SSPC system. This fuse is calibrated to cut-off when a threshold

value higher than the safety cut-off value for the SSPC’s main switch is reached.

The cut-off of this fuse occurs only in the event of failure of the downstream circuit and, because 10

the characteristics of the fuses are normal trip time (I2t curves), it cannot be possible to reduce

electrical arc thermal impacts with a fast trip as the main SSPC would have done.

Therefore, such a back-up solution does not make it possible to ensure with a very high probability

(< 1.10-9 /h)) that the secondary circuit will be fast opened in case of short circuit.



The idea (See figure 2) is to arrange a back-up switch, hereinafter referred as to alternative switch,

downstream the main switch. The alternative switch comprises a fuse in serial with the main SSPC

on the power line, and another SSPC system, hereinafter referred to as alternative SSPC system,

which is connected downstream the fuse between the power...