I. Definition and Core Features
Power cables are insulated cable systems designed for transmitting and distributing high-power electrical energy, serving as the core transmission medium in power networks. Their design objective is to safely, reliably, and efficiently deliver electrical energy under various environmental conditions.

Core Features:
High Voltage and Current Capacity: Rated voltage ranges from 0.6/1kV to over 500kV, with current-carrying capacity reaching thousands of amperes.
Multi-Layer Protective Structure: Composite design comprising conductor + insulation + shielding + sheath + (optional armor).
Environmental Adaptability: Suitable for installation in complex environments such as direct burial, underwater, tunnels, and steep gradients.
Long-Distance Transmission: Single-section lengths can extend several kilometers, reducing fault points at joints.

II. Main Types and Application Scenarios
Typical Industry Applications:
Energy and Power: Power plant outgoing lines, substation connections, renewable energy (wind, solar) collection systems.
Urban Infrastructure: Underground utility tunnels, metro and tunnel power supply, urban lighting backbone networks.
Industrial Manufacturing: Large motor feeders, production line main power supply, data center power distribution.
Transportation: Port shore power, railway traction power supply, airport runway lighting.

III. Summary of Core Advantages
Technical Advantages:
1. High transmission efficiency (loss ≤ 0.5%).
2. High short-circuit capacity (meets thermal stability current requirements).
3. Long lifecycle (design life ≥ 30 years).

Safety Advantages:
1. Excellent fire performance (flame-retardant Class A).
2. Waterproof and moisture-resistant (radial water-blocking structure).
3. Reliable grounding (continuous metal shielding).

Economic Advantages:
1. Lower overall cost (compared to overhead lines).
2. Low maintenance costs (maintenance-free design).
3. Space-saving (allows multi-circuit installation).

Environmental Advantages:
1. No electromagnetic pollution (shielding design).
2. Recyclable materials (copper/aluminum recovery rate > 95%).
3. Environmentally friendly production processes (low-energy manufacturing).