SPFB Speed Control System Cables
Application
The cables are used for the train speed control system (French system KVB). The cables are laid along railway lines and connect the speed sensors (located between the rails) to the encoder located inside the trackside equipment shelter.
Standard
Cable Construction
| Conductors |
Class 2 stranded tinned copper. |
| Insulation |
Solid polyethylene. |
| Cabling Element |
Twisted pair. |
| Inner Sheath |
Low density polyethylene. |
| Armour |
Galvanized steel braid armour. |
| Outer Sheath |
Flame Retardant PVC. |
Electrical Characteristics at 20℃
| Nominal Conductor Diameter |
mm |
0.8 |
| Nominal Cross Section Area |
mm^2 |
0.5 |
| Maximum Conductor Resistance (DC) |
Ω/km |
36 |
| Characteristic Impedance @100KHz |
Ω |
120 |
| Maximum Attenuation @50KHz |
dB/km |
5 |
| Nominal Insulation Thickness |
mm |
0.55 |
| Operating Voltage |
V |
500 |
Mechanical and Thermal Properties
- Minimum Bending Radius: 8×OD (static); 16×OD (dynamic)
- Temperature Range: -30℃ to +70℃ (during operation); -20℃ to +50℃ (during installation)
Dimensions and Weight
| Cable Code |
No. of cores& Nominal Conductor Cross Sectional Area |
No. & Nominal Diameter of Strands |
Nominal Sheath Thickness |
Nominal Overall Diameter |
Nominal Weight |
| Inner |
Outer |
| |
No.×mm^2 |
No/mm |
mm |
mm |
mm |
kg/km |
| RS/SPFB-2Y2Y(SWB)2Y-2C0.5S |
2 x 0.5 |
7/0.32 |
1.0 |
1.5 |
9.1 |
97 |
