An underwater cable arrangement includes systems and method for distributing and/or transferring power and/or data to internal devices and external devices disposed along an underwater cable Under water coupling systems and underwater electrical devices may be used in the distribution and/or transfer of the power and/or data

Electrical power distribution and communication system for an underwater cable

An internal device for use in an underwater cable may comprise a body having an outer periphery, body being mountable inside the cable with the cable surrounding the outer periphery of the body. The body may include a cutaway portion, a slot, or a dovetail joint. An underwater cable arrangement may comprise an underwater cable and an internal device disposed in the cable with the cable surrounding the device. The underwater cable may include a stress member connected to the internal device by an interference fit or the internal device may include a slot for receiving the stress member. A method of connecting a stress member of an under water cable to an internal device includes forming an interference fit between a region of increased diameter of the stress member and the internal device.

Underwater cable arrangements, internal devices for use in an underwater cable, and methods of connecting and internal device to a stress member of an underwater cable

An underwater cable arrangement comprises an underwater cable capable of being towed through the water, an external device for mounting on the exterior of the cable, and a coil support device disposed inside the cable for supporting a coil. In some embodiments, the coil support device and the external device have engaging portions which co-act with each other to prevent relative rotation of the coil support device and the external device about the longitudinal axis of the cable. In some embodiments, the underwater cable has a skin and the external device is positioned around the coil support device with the skin of the underwater cable between them. The coil support device and the external device have an interference fit with respect to each other to resist relative movement to the coil support device and the external device in the longitudinal direction of the cable. In some embodiments, the external device and the coil support device are fitted to each other so as to maintain a constant angle between a longitudinal axis of the cable and a longitudinal axis of the external device.

Underwater cable arrangement and coil support arrangement for an underwater cable

The current supply frequency (fp) is made exactly equal to the sample frequency (fs) for the collection of seismic data, or equal to an exact multiple of said sample frequency (fs). The current supply 2 may be controlled to operate at the required frequency by means of a voltage controlled oscillator 7 having an input from a phase comparator 6. A master clock 4 is connected to a hydrophone cable 3 to control the data stream and also supply one of the inputs of comparator 6 via a divider 5. Alternatively, separate crystal oscillators may be used for the clock 4 and to control the supply 2.

Synchronization of the current supply frequency in digital seismic streamers

SYSTEME D'ALIMENTATION ELECTRIQUE UTILISE POUR ALIMENTER ELECTRIQUEMENT DES SECTIONS ACTIVES DE FLUTES IMMERGEES NUMERIQUES. LA FREQUENCE D'ALIMENTATION ELECTRIQUE FP EST EXACTEMENT EGALE A LA FREQUENCE D'ECHANTILLONNAGE FS D'ACQUISITION DES DONNEES SISMIQUES, OU EGALE A UN MULTIPLE EXACT DE CETTE FREQUENCE D'ECHANTILLONNAGE FS.

Hatteland Kjell

Papers

Synchronization of the current supply frequency in digital seismic streamers

Systeme d'alimentation electrique des sections actives de flutes numeriques immergees