OPGW cable has two constructions

Central loose tube type

The fibers is placed loosely in a sealed and water resistant stainless steel tube filled with water blocking gel. This tube provides protection to the fiber during installation and operation under severe environmental conditions. Aluminium layer over the tube is optional. The stainless optical tube is located at the center of the cable protected by single or multiple layers of aluminium clad steel and aluminium annoy wires. The aluminium clad steel wires are shaped trapezoidally around the optical unit to provide compact construction. The metallic wires provide mechanical strength to withstand severe installation and operating conditions, while achieving conductivity to controltemperature rise during short circuit conditions. 

Multi loose tube type

Multi Lose Tube Type

The fibers is placed loosely in a sealed and water resistant stainless steel tube filled with water blocking gel. Two or three stainless steel optical tubes are helically stranded in the inner layer of a multiple-layer cable. The multi loose tube type is designed mostly for very high fiber count requirement over 48 with the maximum fiber count reaching 144. The multi loose tube type can meet the requirement of huge cross and large current capacity.  

Feature：

1.Stainless-steel optical fiber unit of central loose tube or layer stranding structure 

2. Aluminium alloy wire and aluminium clad steel wire armored

3. Coated with anticorrosive grease between layers

4. OPGW can support heavy load and long span installation

5.OPGW can meet the ground wire‘s requirement of mechanical and electric by adjusting proportion of steel and aluminium

6. Easy to produce the similar specification of exist ground wire can replace the exist ground wire

Application：

1. OPGW cable is mainly used in 500KV, 220KV and 110KV lines, limited by power cut, security and other elements, mostly used in new lines. Its applications are:high pressure over 110kv, with a longer span (usually over 250M)

2. Easy to maintain, easy for line span, its mechanical property can meet a big line span

3. Outer OPGW is metal armoring, with no influence for high pressure electro-corrosion and degradation

4. To construct OPGW must cut power, resulting in greater loss, thus OPGW must be used in constructing high pressure line over 110kv