ZPAU & ZPAU-SH Main Signalling Cables (AC Electrified Lines)
Application
The cables are designed for connection between traffi c control centers and equipment shelters along the trackside. The cables are specially designed to give good induction protection (R.F= 0.26 at inductive voltage 100V/km) and are suitable for installation in intercity railways electrifi ed at 25KV ac.
Standards
- SNCF CT 445 / SNCT ST 698G
- NF F 55-698
Construction
- Conductors: Solid annealed copper, 1.0/1.5 mm² nominal cross section area.
- Insulation: Solid polyethylene.
- Cabling Element: Each two conductors are twisted together to form a pair.
- Stranding: Pairs are helically stranded in layers to form the cable core.
- Core Wrapping: Plastic tape(s) with overlapping.
- Inner Sheath: PE sheath. LSZH FR option can be offered upon request to NF C 32 070.2.2 (C1).
- Electrostatic Shield: One corrugated copper tape.
- Intermediate Sheath: PE/PVC sheath. LSZH FR option can be offered upon request to NF C 32 070.2.2 (C1).
- Electromagnetic Shield: Two helically applied steel tapes of 0.5mm.
- Outer Sheath: PE/PVC Sheath. LSZH FR option can be offered upon request to NF C 32 070.2.2 (C1).
- Remarks: ZPAU: PE/PVC Sheath; ZPAU-SH: LSZH Sheath.
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Electrical Characteristics at 20℃
| Nominal Conductor Diameter | mm | 1.13 | 1.38 |
| Nominal Cross Section Area | mm² | 1.0 | 1.5 |
| Maximum Conductor Resistance (DC) | Ω/km | 18.1 | 12.31 |
| Minimum Insulation Resistance @500 V DC (3mins) | MΩ.km | 5000 | 5000 |
| Maximum Mutual Capacitance @1000Hz (AC) | nF/km | 55 | 55 |
| Maximum Capacitance Unbalance (pair to pair) @800Hz | |||
| 100% cases | pF/500 m | 400 | 400 |
| 90% cases | pF/500 m | 200 | 200 |
| Attenuation @45KHz | dB/km | 2.5 | 2.5 |
| Characteristic Impedance @45KHz | Ω | 120 | 120 |
| Dielectric Strength, conductor to conductor (DC voltage 3secs) | V | 4500 | 4500 |
| Operating Voltage (AC/DC) | V | 450/750 | 450/750 |
| Peak Value (AC) | V | 900 | 900 |
Mechanical and Thermal Properties
- Minimum Bending Radius: 8×OD (static); 16×OD (dynamic)
- Temperature Range: -40℃ to +70℃ (during operation); -20℃ to +50℃ (during installation)
Reduction Factor
| Inductive Voltage (V/km) Em | 28 | 32 | 37 | 42 | 47 | 50 | 70 | 80 | 100 | 120 | 170 | 225 |
| Reduction Factor @50Hz Rk | 0.75 | 0.70 | 0.60 | 0.50 | 0.40 | 0.35 | 0.30 | 0.28 | 0.26 | 0.25 | 0.24 | 0.25 |
Dimensions and Weight
| Cable Code | No. of Pairs | Nominal Sheath Thickness mm |
Nominal Overall Diameter mm |
Nominal Weight kg/km |
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| Inner | Interm. | Outer | ||||
| 1.13mm Conductor, 2.3mm Insulated Wire | ||||||
| RS/ZPAU-2Y2Y(K)2YB2Y-1P1S | 1 | 1.0 | 0.8 | 1.6 | 16.2 | 490 |
| RS/ZPAU-2Y2Y(K)2YB2Y-2P1S | 2 | 1.0 | 0.8 | 1.6 | 17.0 | 550 |
| RS/ZPAU-2Y2Y(K)2YB2Y-3P1S | 3 | 1.0 | 0.8 | 1.6 | 22.2 | 820 |
| RS/ZPAU-2Y2Y(K)2YB2Y-4P1S | 4 | 1.0 | 0.8 | 1.6 | 23.8 | 890 |
| RS/ZPAU-2Y2Y(K)2YB2Y-7P1S | 7 | 1.0 | 0.8 | 1.7 | 26.7 | 1080 |
| RS/ZPAU-2Y2Y(K)2YB2Y-14P1S | 14 | 1.2 | 0.8 | 1.8 | 32.3 | 1560 |
| RS/ZPAU-2Y2Y(K)2YB2Y-21P1S | 21 | 1.2 | 1.1 | 2.0 | 37.2 | 1990 |
| RS/ZPAU-2Y2Y(K)2YB2Y-28P1S | 28 | 1.2 | 1.1 | 2.2 | 41.4 | 2380 |
| RS/ZPAU-2Y2Y(K)2YB2Y-56P1S | 56 | 1.3 | 1.3 | 2.5 | 52.9 | 3700 |
| 1.38mm Conductor, 2.55mm Insulated Wire | ||||||
| RS/ZPAU-2Y2Y(K)2YB2Y-14P1.5S | 14 | 1.2 | 0.8 | 1.8 | 35.0 | 2050 |
| RS/ZPAU-2Y2Y(K)2YB2Y-21P1.5S | 21 | 1.2 | 1.1 | 2.0 | 39.5 | 2525 |