Specifications

The document outlines the specifications for petroleum-filled quad railway signaling cables with an armoured polyethylene sheath and a reduction factor (RF) of 0.3, as per ADIF specification ET-03.365.051.6, 2nd edition. These cables are designed for telecommunication and rail circuits, particularly where protection against high voltage line induction is necessary.

Description and Application

The cables range from 1 to 27 star quads with conductors of 0.9 and 1.4 mm, insulated with polyethylene. The core is filled with a petroleum compound and protected by an anti-inductive sheath. They are suitable for installation in ducts or direct burial and are resistant to rodents.

Construction

• Conductors: Annealed copper wire, 0.9 and 1.4 mm in diameter.
• Insulation: Solid polyethylene.
• Cabling Element: Star quads.
• Core Formation: Stranded in layers.
• Filling Compound: PE jelly.
• Core Wrapping: Dielectric tape applied longitudinally with overlap.
• Inner Sheath: Polyethylene.
• Cable Screen: Corrugated copper tape applied longitudinally with overlap.
• Armour: Two helically applied steel tapes, each 0.5 mm thick.
• Outer Sheath: UV resistant black polyethylene.
• Sheath Marks: Manufacturer's name, year, and length marks, along with other customer-specific marks.

Electrical Characteristics (at 20ºC)

• Conductor Maximum Resistance: 29.0 Ω/km for 0.9 mm and 11.90 Ω/km for 1.4 mm.
• Resistance Unbalance: Average 1%, Maximum 2%.
• Minimum Insulation Resistance: 25000 MΩxkm at 20ºC, 500 V.
• Mutual Capacitance: Average 38±3 nF/km for 0.9 mm and 41±4 nF/km for 1.4 mm, Maximum 45 and 48 nF/km respectively.
• Capacitance Unbalance: Pair-pair average < 35 pF/460m, maximum < 250 pF/460m; Pair-earth average < 320 pF/460m, maximum < 1200 pF/460m.
• Dielectric Strength: 3000 Vdc conductor-conductor, 5000 Vdc conductor-screen.

Transmission Characteristics (at 20ºC)

• Nominal Attenuation: 0.70 dB/km at 1 KHz, 1.60 dB/km at 10 KHz, 2.10 dB/km at 30 KHz for 0.9 mm; 0.46 dB/km at 1 KHz, 0.85 dB/km at 10 KHz, 1.30 dB/km at 30 KHz for 1.4 mm.

Reduction Factor, Rk (50 Hz)

• Induced Voltage: 0.3 V/km for both 0.9 mm and 1.4 mm.

Mechanical Characteristics

• Operating Temperature Range: -25º C to +75º C.
• Minimum Radius of Curvature: 15 x Rcable.

Dimensions and Weights

The document provides detailed dimensions, weights, delivery lengths, and drum types for various cable configurations, ranging from 1 to 27 quads, with specific codes for each configuration.