English

Vol. 9 6, 2019 p 692-699

Pages

Article name, authors, abstract and keyword

692-699

Test results for dead-end clamps used in along-route overhead power transmission lines

lexander . Nemtsev a, Artyom V. fimov b, Georgy V. Mosolov b

a Transneft, 4, bldg 2, Presnenskaya Embankment, Moscow, 123112, Russian Federation

b Pipeline Transport Institute, LLC (Transneft R&D, LLC), 47a, Sevastopolsky prospect, Moscow, 117186, Russian Federation

DOI: 10.28999/2541-9595-2019-9-6-692-699

Abstract: An analysis of the causes of operation disturbances in overhead power lines shows that tension clamps (parts of linear fittings) are among the most reliable elements, whereas the main problem is various wire failures. We presented the results of comparative tests of tension clamps of the following types: bolt clamp NB-2-6, wedged clamp NZ-2-7, wedge clamp NK-1-1, spiral clamp NS-15,2-02.
Comparative tests of clamp samples NB-2-6, NZ-2-7, and NS-15,2-02 with mechanical impacts were carried out using the following criteria: testing the installation conditions, bolt tightening test (if any), mechanical testing of the wire termination in the clamp, mechanical testing of the clamp strength, mechanical testing of the strength under the aeolian vibration. When testing the wire termination strength, slippage and the wire upper coil destruction were recorded in sample NZ-2-7 when the load reached 62 % of the standard value. When testing the wire resistance to aeolian vibration in a bolt clamp sample NB-2-6, the wire upper coil destruction was recorded at a value of 3107 vibration cycles (with a standard value of 108 cycles).
Other clamp samples successfully passed mechanical tests. To assess the effect of ferromagnetic properties of the material on energy loss during clamp reversal magnetization, we considered clamps NB-2-6, NZ-2-7, NS-15,2-02, and wedge clamp NK-1-1. We found that the energy loss due to magnetization reversal of spiral clamp NS-15,2-02 were more than double that of clamp NZ-2-7 and more than three times, for clamp NB-2-6, being comparable with energy losses during reversal magnetization of clamp NK-1-1.
We made recommendations to reduce the risks of disturbances in overhead power lines, taking into account the use of various types of tension clamps.

Keywords: overhead power line, overhead power line fittings, tension clamp, wire mount, tests of overhead power lines fittings.

For citation:
Nemtsev A. A., Efimov A. V., Mosolov G. V. Test results for dead-end clamps used in along-route overhead power transmission lines. Nauka i tehnologii truboprovodnogo transporta nefti i nefteproduktovScience & Technologies: Oil and Oil Products Pipeline Transportation. 2019;9(6):692699.

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