OKGT-TS-A

Optical cable in an overhead ground wire, with an aluminium-sheathed optical unit

OKGT-Ts-A is a modification of OKGT-Ts with an aluminium sheath on the central optical unit. The aluminium sheath increases the current-carrying cross-section of the cable and provides additional protection of the fibres against mechanical and thermal effects. It is used where the requirements for protecting the optical fibres are higher or where large short-circuit currents have to be carried. Designation breakdown: A – aluminium sheath on the unit.

Application OHL ≥ 35 kV

Feature Al sheath on the unit

Fibre protection Enhanced

Fibre count up to 144

Request a price Size table

OKGT-Ts-A PRODUCT RANGE

Sizes with technical specifications.

Type	Fibre count	⌀, mm	Weight, kg/km	Strength, kN	Short-circuit withstand, kA²·s
OKGT-Ts-A-12	12	13.8	450	65	115
OKGT-Ts-A-24	24	14.7	530	80	150
OKGT-Ts-A-48	48	16.1	605	88	195
OKGT-Ts-A-72	72	17.5	705	100	225
OKGT-Ts-A-96	96	18.8	805	115	265
OKGT-Ts-A-144	144	20.8	945	135	320

The table contains typical configurations. OKGT cables are manufactured to individual calculations for each project – contact us and we will gather all the necessary requirements (loads, climate, fibre count, type of fittings) and select the optimal design.

Description of OKGT-Ts-A

OKGT-Ts-A is an improved version of OKGT-Ts with an aluminium sheath on the central optical unit. This gives three key advantages:

Protection against flashovers: in the event of an insulation flashover on the OHL, the fibres remain safe thanks to the electrically conductive sheath around the unit
Increased current-carrying area: the aluminium sheath adds 5-15 mm² of Al to the total cross-section, which increases the thermal short-circuit withstand by 10-20%
Additional mechanical protection: the Al sheath distributes loads between the steel and the optical fibres

It is used on critical OHLs of backbone telecom operators, in areas with high lightning activity and on lines with large short-circuit currents.

Applications

Trunk OHLs with critical requirements for communication reliability

Lines in areas with high lightning activity

OHL sections with large short-circuit currents (>20 kA)

Backbone networks of telecom operators on power grid infrastructure

Protection of optical fibres from insulation flashovers and induced currents

Construction

Central element – steel optical unit with Al sheath

A hermetically sealed steel tube containing the fibres, covered with an aluminium sheath. It provides additional protection against insulation flashovers and increases the current-carrying area.

Optical fibres

Grouped in bundles, marked with coloured threads. G.652.D + G.657.A1.

Layer

Aluminium-clad steel wires.

Cross-section of OKGT-Ts-A – steel optical unit in an Al sheath + aluminium-clad steel layer

Technical specifications

Fibre count up to 144

Fibre type G.652.D + G.657.A1

Unit feature Aluminium sheath

Fibre protection Enhanced (against flashovers and currents)

Cable diameter 13 – 22 mm

Strength 70 – 130 kN

Short-circuit withstand 100 – 300 kA²·s

Attenuation @ 1550 nm ≤ 0.19 / 0.20 dB/km

Standard IEC 60794-1, ITU-T G.652.D

Detailed specifications are given in the project specification

Operating conditions

Operating temperature -60°C … +85°C

Installation temperature -30°C … +50°C

Transport and storage -60°C … +70°C

Min. bending radius at least 20 cable diameters

Service life 50 years

Warranty 5 years

Climatic category UHL1 (for outdoor operation)

OKGT-TS-A