IEEE 1594-2020 pdf free download – IEEE Standard for Helically-Applied Fiber Optc Cable Systems (WRAP) for Use on Overhead Utlity Lines.
6.2.1.11.2 Test procedure The test shall consist of five fault currents with a current value arising from the value I 2 t to be used for the test. The duration of each fault current shall be 0.5 s ± 0.15 s. The temperature of the ground wire before the first fault current shall be 20 °C ± 5 °C. Successive fault currents shall be applied after the ground wire has cooled naturally to 40 °C ± 5 °C. It is possible to heat up the conductor with a current to raise the temperature to 40 °C ± 5 °C. This current shall be switched off 15 s before the fault current is applied and can be reapplied 30 s after the fault current has been applied. Measurements shall be compliant to 6.2.1.11.
6.2.1.12 Lightning test A lightning test shall be performed. A permanent or temporary increase in optical attenuation (including during the test) greater than 0.20 dB at 1550 nm ± 20 nm for single-mode fibers, or 0.40 dB at 1300 nm ± 20 nm for multimode fibers, shall constitute failure. There shall be no breach of the jacket after completion of the test and no damage whatsoever to the tubes or jackets protecting the fibers.
6.2.1.12.1 Test setup The ground wire shall be secured in the manner approved by the laboratory undertaking the testing. A sample of WRAP cable shall be attached securely to the ground wire in the manner in which it would be installed in the field. The total length of WRAP cable, including those sections not under test, shall be at least 10 m in length. Optical fibers shall be spliced in series such that the total fiber length under test is in excess of 100 m. At least one optical fiber from each bundle or tube shall be included in this length.
The electrode shall be positioned at a distance of 100 mm from the ground wire directly above it. A fuse wire of diameter no greater than 70 μm shall be attached to the electrode and the ground wire. Polyethylene sheeting may be used to limit the point of contact of the arc on the ground wire though the section exposed under the electrode shall be at least 200 m in length centered directly beneath the electrode. Refer to Annex A on the methodology on establishing incidence of lightning strokes. The lightning arc test shall be performed on ground wire with WRAP cable samples of suffcient length to provide a test length that is a minimum of 2 m on either side of the test point. The cable shall be terminated at each end with suitable fttings, and a tension of 20% ± 5% of ultimate tensile strength (UTS) shall be applied.
6.2.1.12.2 Test procedure The current wave shall be delivered through a non-thoriated, tungsten rod. The rod shall have a diameter of 3 mm to 4 mm and a hemispherical tip. The rod shall be mounted with its axis aligned with the radius of the cable, with the tip 4 cm to 6 cm from the cable surface. The rod shall be connected to the cable with a fuse wire. The surface of the cable in the test feld shall be externally heated to 40 °C ± 5 °C.
This may be accomplished by using a heat gun to warm the area near the test electrode to several degrees beyond the test requirement, and allowing several minutes for the heat to dissipate and for the cable to cool to within the specifed range. The applied waveform shall include an arc-initiation component and a continuing current component applied as one continuous discharge. The arc initiation component is a current pulse of suffcient rise and magnitude to melt the fuse wire on the rising edge (i.e., before the current peak). IEEE 1594 pdf download.