How does a steel wire detection cable work?

Steel Wire Detection Cable: Working Principle
This specialized cable integrates signal transmission, power supply, and mechanical load-bearing capabilities into a single unit. Its operation is divided into two aspects: electrical working principles and mechanical load-bearing principles, and it works in conjunction with front-end detection equipment to perform tasks.
I. Mechanical Load-Bearing Principle (One of the Core Functions)
The cable’s outer layer, consisting of a double-layer high-strength steel wire armor, serves as the primary load-bearing structure:
When lowering or hoisting underground or underwater detection instruments, the steel wire armor bears the entire weight of the equipment and the operational tensile force, ensuring that the internal conductors are not subjected to tension and preventing conductor breakage or insulation damage.
The steel wires are tightly stranded, providing resistance to crushing, abrasion, and tensile stress, making the cable suitable for long-distance suspension operations in deep wells and underwater environments.
II. Electrical Operating Principle (Signal Transmission + Power Supply)
1. Power Supply
The internal copper conductor serves as the power supply circuit, delivering operating power to probes, sensors, and downhole instruments to ensure the normal start-up, shutdown, and operation of front-end equipment.
2. Signal Transmission
The wire cores, combined with a fluoroplastic insulation layer, provide electrical isolation, eliminating electrical leakage and signal crosstalk between cores; the low dielectric constant of fluoroplastic ensures stable transmission of high-frequency and weak detection signals.
Multi-layer copper shielding (phase-by-phase shielding + overall shielding) blocks electromagnetic interference generated by downhole motors, formations, and surrounding equipment, preventing distortion of detection data.
Downhole sensors collect physical parameters such as temperature, pressure, liquid level, resistivity, and flow velocity. After converting these into electrical signals, they are transmitted upward through the cable conductors to the surface control console.
III. Overall Workflow
Surface equipment suspends and lowers the detection instrument to the target location via the steel wire armor layer of the cable;
The internal conductors of the cable supply power to the instrument, and the sensors collect real-time field data;
Data is transmitted back to the surface system as electrical signals along the conductors, enabling monitoring, detection, and control;
Upon completion of the operation, the equipment is retrieved by hoisting the entire assembly using the tensile strength of the steel wire armor.