ZPAU & ZPAU-SH Main Signalling Cables (AC Electrifi ed Lines)
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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.
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 |
|
