Cable transportation installation with improved safety, method for detecting an event on a cable and method for manufacturing one such installation

Method for detecting an event on a cable in a cable transportation installation comprising at least the following steps:

• providing a cable transportation installation comprising a cable, and a plurality of pillars each provided with at least one sheave, the cable being arranged pressing on the at least one sheave of the plurality of pillars, at least one pillar of the plurality of pillars being provided with at least one optical fuse defining a first state allowing an optical signal to pass and a second state preventing the optical signal from passing, the at least one optical fuse being configured to change state between the first state and the second state when the at least one optical fuse detects an event on the cable;
• regularly transmitting a signal passing through the at least one optical fuse;
• detecting absence of receipt of said signal by a receiver device and deducing therefrom a change of state of the at least one fuse representative of an event on the cable,
• wherein the at least one optical fuse comprises an optical fibre,
• wherein the optical signal is designed to pass through the at least one optical fuse,
• wherein the receiver device is an optical receiver device and wherein at least one optical fuse is configured to change state when said at least one optical fuse is mechanically stressed by the cable.

Method for manufacturing a cable transportation installation comprising:

• providing a cable transportation installation comprising a cable, and a plurality of pillars each provided with at least one sheave, the cable being arranged pressing on the at least one sheave of the plurality of pillars, at least one pillar of the plurality of pillars being provided with at least one electric fuse defining a first state allowing an electrical signal to pass and a second state preventing the electrical signal from passing, the at least one electric fuse being configured to change state between the first state and the second state when the at least one electric fuse is mechanically stressed by the cable, the at least one electric fuse being connected to a detection circuit by an electrically conducting cable, the detection device being configured to detect at least one event on a cable;
• replacing the at least one electric fuse by an optical fuse, the at least one optical fuse defining a first state enabling an optical signal to pass and a second state preventing the optical signal from passing, the at least one optical fuse being configured to change state between the first state and the second state when the at least one optical fuse detects an event on the cable;
• connecting the at least one optical fuse to the detection circuit via an optical line, and wherein the detection device comprises a transmitter device configured to transmit an optical signal, a receiver device configured to receive said optical signal, the transmitter device being connected to the receiver device by the at least one optical fuse, the detection device being configured to emit an alarm in response to detection of a change of state of the at least one optical fuse of the plurality of pillars.