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    ZPAU & ZPAU-SH Main Signalling Cables (AC Electrified Lines)

    Application

    The cables are designed for connection between traffic 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.

    Standard

    • SNCF CT 445 / SNCT ST 698G
    • NF F 55-698

    Cable Construction

    • Electrical Characteristics at 20℃Conductors: Solid annealed copper, 1.0/1.5 mm 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.
    Nominal Conductor Diameter mm 1.13 1.38
    Nominal Cross Section Area mm 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
    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

     

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