OPGW
Optical cable in an overhead ground wire, with a central optical unit
OKGT-Ts is an optical cable built into an overhead ground wire, with a central optical unit. It combines the lightning-protection function of the OHL and a fibre-optic communication channel in a single structure, saving costs compared with installing a separate ground wire and optical cable. Designation breakdown: OK – optical cable, GT – overhead ground wire, Ts – central optical unit.
Sizes with technical specifications.
| Type | Fibre count | ⌀, mm | Weight, kg/km | Strength, kN | Short-circuit withstand, kA²·s | Al cross-section, mm² |
|---|---|---|---|---|---|---|
| OPGW C-12 (OKGT-Ts 12) | 12 | 13.5 | 430 | 60 | 100 | 65 |
| OPGW C-24 (OKGT-Ts 24) | 24 | 14.4 | 510 | 75 | 135 | 80 |
| OPGW C-48 (OKGT-Ts 48) | 48 | 15.8 | 583 | 82.6 | 177 | 94.6 |
| OPGW C-72 (OKGT-Ts 72) | 72 | 17.2 | 680 | 95 | 210 | 115 |
| OPGW C-96 (OKGT-Ts 96) | 96 | 18.5 | 780 | 110 | 250 | 135 |
| OPGW C-144 (OKGT-Ts 144) | 144 | 20.5 | 920 | 130 | 305 | 160 |
OKGT-Ts (Optical Ground Wire) is a combined cable that performs two functions at once: lightning protection of the overhead power line (protecting the phase conductors from direct lightning strikes and shunting induced short-circuit currents to earth) and fibre-optic communication for the operational needs of the power industry and/or commercial services.
The “Ts” design – with a central optical unit – is optimal for most applications: it gives maximum protection of the fibres, simplicity of manufacture and a wide choice of fibre counts (from 12 to 144). It is used on 35-1150 kV overhead lines. Additional functions: distributed temperature (DTS) and acoustic (DAS) sensing systems make it possible to detect lightning strikes, short circuits, icing and route breaches in real time.
TCG production complies with IEC 60794-1 (general requirements for optical cables) and the ITU-T G.652.D + G.657.A1 recommendations (standard single-mode fibre with reduced sensitivity to bending losses). Service life is 50 years.
Central element – steel optical unit
A hermetically sealed steel tube containing the fibres, filled with water-blocking gel. It protects the optical fibres from mechanical loads and moisture ingress.
Optical fibres
Grouped in bundles of 12, wrapped with coloured synthetic threads for identification. Type G.652.D + G.657.A1 – insensitive to bending losses.
1st layer
Wires of aluminium alloy 6201 – they provide electrical conductivity to carry away short-circuit currents.
2nd layer
A combination of aluminium-alloy wires and aluminium-clad steel wire – they carry the mechanical load.
Cross-section of OKGT-Ts – steel optical unit in the centre + Al layer + combined steel-Al layer
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