2025-11-17
The main characteristic of oil-filled cables is that they use a set of devices (such as pressure tanks, gravity tanks, etc.) to replenish impregnating agents to improve the cable's pressure resistance.
(1) Self-contained oil-filled cable: This type of cable has two structures: single-core and three-core. The voltage level of the single-core cable is 110~750kV, and the voltage level of the three-core cable is generally 35~110kV. Its representative model is CYZQ☐☐ (such as CYZQ241 type), and its structure is shown in the figure.
Schematic diagram of self-contained oil-filled cable structure
(a) Cross-section of a single-core self-contained oil-filled cable
(b) Outline drawing
(c) Three-core self-contained oil-filled cable
1-Oil channel; 2, 10-Conductor; 3, 11-Conductor barrier; 4, 12-Insulation layer; 5, 13-Insulation shield; 6, 17-Lead sheath; 7-Inner liner; 8-Reinforcing copper tape; 9, 20-Outer sheath; 14-Oil channel; 15-Filling; 16-Copper wire braided tape; 18-Inner liner; 19-Reinforcing layer;
(2) Oil-filled steel pipe cable: This type of cable is generally a three-core structure and is often used for high voltage levels. The steel pipe is the sheath of the cable, and its structure is shown in the figure.
Schematic diagram of oil-filled steel pipe cable structure
(a) Cross-sectional view (b) Outline view
1-Conductor; 2-Conductor barrier; 3-Insulation layer; 4-Insulation shield; 5-Semi-circular stripper wire; 6-Steel pipe; 7-Anti-corrosion layer;
