Cables multiple-strand seismic CBS (optional)

摘要

The invention relates to flexible geophysical cables for transmitting electrical signals of frequency up to 1 kHz during seismic operations in field conditions at an ambient temperature of minus 60 ° to plus 55 ° C with an acceptable heating them in the summer to plus 70 ° C.; in both embodiments comprises a conductive cable core formed from one or seven copper wires insulated with polyethylene or polypropylene, a twisted pair. twisted conductive wire pairs in semiparnye group, each of which is superimposed the fastening of the winding filament. According to a first embodiment of a stranded cable semiparnye group. According to a second embodiment of cable further comprises a pair of separate upper by coils. Above the total twist of both embodiments of superimposed winding a polyethylene terephthalate film, and on top of the winding - a shell of a thermoplastic elastomer or thermoplastic polyurethane, or PVC. Insulation of conductors in a pair of a different color. In addition, a pair of different color to at least one insulated electrical conductor. Each pair has a length of lay, and these steps are mutually agreed for all pairs. The fastening of the winding of all groups also differ in color.; Consistency steps twist pairs, and also manufacturing of conductors of copper wires having a low resistance, allow to exclude the influence of high-frequency electrical signals to each other to provide a small power loss and low attenuation of signals. Combining the seven pairs of conductors in one group, and the bond of the filament winding increases the reliability of the cable, the cable ends are not spliced ​​during transport, assembly and disassembly of the cable. The soft, light and copper plastic cable provide flexibility, small size and weight.