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The development of the new generation ground wire for lightning protection

The development of the new generation ground wire for lightning protection of overhead transmission lines. Motivation of new product creation .

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The development of the new generation ground wire for lightning protection

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  1. The development of the new generation ground wire for lightning protection of overhead transmissionlines

  2. Motivation of new productcreation Market demand in production, closeto lifetime to the core elements of theoverhead transmission lines, both current and prospective without substantial rise in price products. Ground wire creation,which provides an effectivelightning protection of overhead transmission from maximum true power lightning strokes Provision of ground wires life duration not less than 40 years, guarantee period on overhead transmissionlines not less than 4 years. Provision of ground wire’s operability under the conditionof its factual exploitation: operations of all spectrum of the main types of loads.

  3. 1 STAGE The estimation of the basic technical features of steel-wire robes according to the GOST 3062-3064, which were used on theoverhead transmission lines as ground wires. Methods Estimation of consumer’s requests Weather exposure test of lightning stroke Aging test Estimation of strength characteristics To realize all system researches, were involved: Engineering CentreFGC UES,ORGRES, Production and Commercial Firm “Eletroservice”, MPEI and other organizations.

  4. Testing technique of lightning stroke • Researches were conducted on the bench tester “Current generator of lightning – quaternary(GTM-4), which is certified by the High voltage electrical equipment test center of the State unitary enterprise (accreditationcertificate № ROSSRU.0001.21MB07 - 09.06.1999 ). Certificate № 7-03-07 - 15.03.2007. Generator «GTM-4» is capable of generating 4 current components with the following parameters: • Component А (current impulse of the first back discharge)height to 200  10 % кА,with action integral (∫ί2dt) - 2·10620%А2·с and exposure time to 500 MKS. • Component В (transitory amperage) with average amplitude 2  10% кА widthto 5 мс and transferred charge 10  10% C. • Component С (DC current) amplitude from 200 to 800 А widthfrom 0,25 to1cand with transferred charge to 200  20% C. • ComponentD (recharge current)withamplitude 100  10% кА, action integral 0,25·10620%А2·с and exposure time to 500 MKS. • Description of the generator component corresponds to theIEC 60794-4-1:1999 requisitions, appendixF. • Measure of theimpulse signalwere certified and tested according to the repetitive metrological testing: shunt ШРТ-1 №002 C.t. 1,5, Rш = 1,16 мОм, attack time no more than 200 ns,was checked 22.05.2007.,digital-readout oscilloscopeTektronix TDS-2012,accuracy class. 2,0, was checked 30.05.2007. • Registration of testing results were made by digital camera (comes with a CD supplement).

  5. Tests results of ground wire №1 JSC “BMK” production. Discharge№1,charge 55C Discharge №2,charge 55C Discharge№3,charge 55C Discharge №4,charge 70C Discharge №5,charge70C Discharge №6,charge 70C

  6. Discharge№8,charge 85C Discharge №7,charge85C Discharge№10,charge 110C Discharge№9,charge 85C Discharge№11,charge110C

  7. Tests results of ground wire №2,JSC “Silur” production Discharge№1,charge 55C Discharge№2,charge 55C Discharge№3,charge 55C Discharge№4,charge 70C Discharge№6,charge70C Discharge№5,charge70C

  8. Discharge№13,charge130C Tests results of ground wires №2, CoLtd “VolgoMetiz” production Discharge №1,charge55C Discharge №2,charge55C Discharge№3,charge55C Discharge №4,charge 70C

  9. Discharge№11,charge 110C

  10. General regimes of aging tests, equipment set and run time within one cyclic process (Testing laboratory “Khotkovo-Test”,25.05.2006.).

  11. Aging tests results (Testing laboratory “Khotkovo-Test”,25.05.2006.)

  12. Basic conclusions about the study of steel ropes according toGOST 3062 -3064 The increase of working time in the process of galvanization (JSC «Sevestal-metiz» technology). The increase of lightning stroke durability in the process of the increase of preformation degree (JSC «Severstal-Metiz» technology). Total loss of service outage in the process of cumulative effect of discharge within the range 40-85 C. The reduction of the aggregate breaking tension after the lightning exposure of all represented steel ropes.

  13. The development of ground wires for overhead transmission lines according to theSTO (Standards of organization) 71915393–TU (Specifications) 062–2008 2Stage Development peculiarity Novelty designof the ground wire according to 71915393–TU (Specifications) 062–2008(ground wire)for the electric power transmission protection from direct lightning strokes consists in the lay consolidation technology, provision of line contactwires and line contact of wires provision, use of the wires outer layer of the plastic straining to enlarge contact area between outer and inner armor wires. This construction provides the reduction of linear extension (confirmation patent of the R.F.). Galvanical methodapplication of coating to a tolerance of +5% prevents zinc layer at increases current and elevated temperature (short circuit), (it increases service life, this product is different from the previous one). Utilize technologyof the lay has no parallel in the Russian Federation, the technology of application of zinc coating is comparable to the technique, which is used by Volgograd plant - JSC Severstal-Metiz in a process of production cable and wire bridges. Constructive result 40 years of service lifeand 20 years of exploitation under the influence of all types of loads.

  14. Producer – Severstal-Metiz (Russia) Cherepovets plant The plant was found in 1965. It produces more than 26000 types of production. Orel plant The plant was found in 1967. it produces more than 11000 types of production. The plant was found in 1954. It produces more than 1500 types of steel ropes and wires. Volgograd plant Authorized provider and developer of the rope and wire production: Co Ltd «Energoservice».

  15. Basic conclusions about the researches of lightning stroke. ) Conclusion The ground wire’s patterns are stable to lightning stroke (with transferred charge 55C and 110C) and also have high stable to a lightning current effect (with transferred charge 147 C),which has total occurrence probability 1,2 %, in negative and positive lightning. It ought to be noted, that such a high lightning resistance of the proved ground wires is connected with it’s improved construction, which is different from the ground wire’s construction and is used today in overhead transmission lines. There is no strength reduction after stoke.

  16. Basic results of the ground wires approval tests according to STO (Standards of organizations) 71915393–TU (Specifications) 062–2008 for the overhead transmission lines. • List of testing: full testing:lightning stroke, mechanical (disruption, after the lightning stroke) eolian vibration ,an attack of wind load, and stableness to short-circuit current. • New ground wire’s construction was developed especially for the protection of overhead transmission lines from lightning strokes, it was made with the use of current rope technologies and it has following peculiarities: • Total resistance to lightning stroke in the load range 98,8%. • High corrosion resistance at the expense of galvanic coating with +5% tolerance and reduction of the total contact area of the ground wire’s surface with environment. • Increased breaking strength (against ropes) - (180kg/mm2 – 200kg/mm2), it provides reliability growth, it is especially important for the anchor poles and during the glaze formation. • Extended service life almost in 2 and 5 times is a guaranteed service, in comparison with the standard rope. • Applied technology, in the process of production of the ground wire’s lay according to the STO (Standards of organization) 71915393–TU (Specifications) provides reduction of the extension strain, which decreases sagging in the process of exploitation. • There is no strength reduction, no disruptions or melting wires to base metal, after lightning strokes 147 C (coulomb). .

  17. Main points of specifications to the ground wire МЗ-В-OЖ- Н-Р* STO (Standards of organization) 71915393-TU (Specifications) 062-2008, which realization is guaranteed by plant JSC «Severstal-Metiz» • Ground wires should be up to quality of the standard and STO (Standards of organization) 56947007-29.060.50.015-2008 Technical requirementsJSC“FGC UES”. • Ground wires ( marking groups 1770n/mm2 (180kgf/mm2), 1870n/mm2 (190kgf/mm2), 1970n/mm2 (200kgf/mm2)) are madefromgalvanized wire, according to the GOST 7372-79, gaugeof zinc coveringshould correspond to the “ОЖ”(extra hard) group with the positive tolerance 5%. • Ground wires are made length at least 500 meters. • Ground wire should be resistant to impulse of the lightning discharge,which size (in Coulombs) is defined by the ground wire suspension, according to the consumer requirements and is installed by manufacturer (if it has an appendix – tensile load, according to the STO (Standards of organization) 56947007-29.060.50.015-2008 Technical requirementsJSC «FGC UES» , at least 85C. • Ground wire should be resistant to the thermal influence of short circuit current,appearing in the process of the ground wire’s exploitation with single and double phase to earth fault, which size and time is installed by manufacturer according to the STO (Standards of organization) 56947007-29.060.50.015-2008 Technical requirementsJSC «FGC UES». • (Lightning protection – premium quality – extra hard – nonspinning – straighten)*

  18. Ground wire should be resistant to the eolian vibration at least 100 million cycles, which frequency should correspond to resonating frequency with wind speedfrom 4 to 8 ms (Frequency = 830/diameter of the ground wirein mm ± 10 Hz),with appendix of the tension load, whichis installed by manufacturer, according to the STO (Standards of organization) 56947007-29.060.50.015-2008 Technical requirementsJSC «FGCUES». • Ground wire should be resistant to the pitching (eolian vibration), in the process of its exploitation and under the influence of crosscut wind flow, alternate aerodynamic lift is appeared, which can create self-sustained oscillations, with the correlation of parallel and torsion motions of rope, STO (Standards of organization) 56947007-29.060.50.015-2008 Technical requirementsJSC «FGCUES». • All others technical requirements should correspond to the GOST requirements 3241-91 and STO (Standards of organization) 56947007-29.060.50.015-2008 Technical requirementsJSC «FGCUES». • In accordance with article13.2, Technical requirementsJSC «FGC UES» guarantee service life of the ground wires should form at least 20 years, from the moment of commencement of operation.

  19. Overhead transmission lines Ground wires (Lightning protection),which were made in accordance with the technical requirements STO (Standards of organization)71915393-TU(Specifications) 062-2008, are meant for the overhead transmission lines protection from lightning strokes, diameters of which from 8 to 22,5mm and resistance from 1770 n/mm2to 1970 n/mm2, are galvanized according to the “ОЖ”(extra hard) group with a tolerance of +5%. The advantages of lightning protection (except high density and better corrosive resistance) is a heightened sturdiness to the lightning pulse influence from 85C and higher. Lightning protection (in contrast to steel ropes) survive even in the zones with heightened probability value of lightning discharges, during the guaranteed service life – 20 years. Sole manufacturer and patent holder : JSC «Severstal-Metiz». Dealer and developer : Co Ltd «Energoservice». Sign of implementation : Lightning protection. Agency output: minimum 350 tons monthly. Standard-size spectrum: 8,0-22,5mm

  20. Ground wires for the overhead transmission lines and lightning strokes protection STO (Standards of organization) 71915393 TU (Specifications) 062-2008 Construction 1 х 36 (1+ 7 + 7/7 + 14)

  21. “Severstal-Metiz” and “Energoservice” express gratitude for kind attention! We are always glad to cooperate!

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