IEEE 1138-2009 pdf download IEEE Standard for Testing and Performance for Optical Ground Wire (OPGW) for Use on Electric Utility Power Lines
3. Definitions
For the purposes of this document, the following terms and definitions apply. The lEEE StandardsDictionary: Glossary of Terms & Definitions should be referenced for terms not defined in this clause.
hardware: Attachments or fittings that are in direct contact with the cable.
maximum design load (MDL): The maximum design load the cable is expected to experience in serviceunder meteorological loading conditions (e.g, wind, ice loads, temperature). The MDL is used indetermining the maximum rated design tension
maximum rated design tension (MRDT): The maximum tension rating of the cable so it will functionover its lifetime without reducing the performance of the optical fibers. This tension rating will bedetermined by the cable manufacturer. MRDT may be expressed in terms of tension or as a percentage ofrated tensile strength (RTS). MRDT may also be known as maximum rated cable load (MRCL).
optical ground wire (OPGW): OPGW cable has the dual performance functions of a ground wire withtelecommunications capabilitics.
optical time delay reflectometer (OTDR): Used to determine the degree and location of attenuation inoptical fibers by transmitting a light source and measuring time of flight and strength of reflected opticalsignal.
rated tensile strength (RTS): The calculated tensile load that the cable shall withstand without mechanicalfailure.
sagging tension (SAT): The initial tension at which the cable is pulled during the sagging portion of theinstallation process. This tension is used to achieve the appropriate sag relative to other conductors and theground.
stringing tension (STT): The tension used to pull the cable through sheaves during the stringing portion ofthe installation process. This is never greater than the sagging tension. Also known as installation or pullingtension.
system (OPGW system): The cable and hardware working together.
NOTE–The cable and hardware described in this standard function as an integrated unit.
4. Description of OPGW cable and components
There are multiple acceptable designs of OPGW. Typically, they consist of one or more layers of metallicwires stranded about a cable core comprised of components such as tubes, wires and/or slotted rods, andoptical fibers in optical fiber units.
4.1 Stranded metallic wires
The composition and stranding of the metallic wires shall be in accordance with the appropriateaindustry standard for metallic wires and cabling such as those referenced in Clause 2. Forconsistency and operability with existing materials and methods used in power transmission lines.the stranded mctal wires shall, where applicable, meet the appropriate wire and cabling standards asthey will apply to conventional ground wire.
At the supplier’s option, the rated tensile strength (RTS) may include the strength of the opticalunit. In this case, the supplier shall notify the customer if the fiber optic unit is considered a load-bearing tension member when determining the total RTS of the composite conductor.
The finished galvanized or aluminum-clad stecl wires shall contain no joints or splices unlessclotherwise agreed upon between the supplier and the purchaser.
4.2 Design of fiber optic unit
The fiber optic unit shall be designed to house and protect the optical fibers from damage due to forcessuch as crushing. bending, twisting, tensile stress. and moisture. The fiber optic unit and the outer strandedmetallic conductors shall serve together as an integral unit to protect the optical fibers from degradation dueto vibration and galloping, wind and ice loadings, wide temperature variations, lightning and fault current.as well as cnvironmental cffccts that may produce hydrogen. The fiber optic unit may include an aluminumtube, channeled aluminum rod, stainless steel tubing, or aluminum-coated stainless steel tubing; but is notlimited to these designs.