Technical Description for CONTINUOUSLY TRANSPOSED CONDUCTORS

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Technical Description for CONTINUOUSLY TRANSPOSED CONDUCTORS TD-CTC001 Replaces issue 05/2003 This document is only a Technical Description. For more details or specific questions please contact ASTA.

1 Technical Description for CONTINUOUSLY TRANSPOSED CONDUCTORS TD-CTC001 Replaces issue 05/2003 This document is only a Technical Description. For more details or specific questions please contact ASTA. This document comprises - this cover sheet - the English language text of Copyright 2003 ASTA Elektrodraht GmbH & Co. All rights reserved. No part of this publication may be reproduced, stored in or introduced into a retrieval system or other media, in any form or by any means (electronic, mechanical, photocopying, or otherwise) without the prior written permission of ASTA Elektrodraht GmbH & Co. This brochure contains only general information and statements. Data and values are warranted or guaranteed by the manufacturer or vendor only, if such warranty or guarantee is expressly agreed upon. Author: Thomas Trimmel Aug 2, 2006 Revised by: Wolfgang FENZ Aug 2, 2006 Released by: Johann PONWEISER Aug 2, 2006 Revision: 8 Page 1/7

2 SINGLE STRIPS Page 2/7 Number of Single Strips: 5-80 Width of Single Strips: 2,80-12,50 mm Thickness of Single Strips: 0,90-4,00 mm Ratio Width Thickness of Single Strips: 2,5:1 to 8:1 Max. Cross Section of Single Strips: 36 mm² BUNDLE Width of Bundle (axial): Height of Bundle (radial): Interleaving Paper: 26mm 90mm may be provided for CTC s of stack height 8mm Stack height = ((number of single strips-1) / 2) * insulated thickness of single strip (odd numbered CTC s) Stack height = ((number of single strips-2) / 2) * insulated thickness of single strip (even numbered CTC s) Interleaving paper can be omitted for CTC s having a single strip thickness of 1,2mm, a ratio radial to axial bundle dimension 5:1 and a max. pressure on the finished winding of 15N/mm² MECHANICAL PROPERTIES Proof Stress R p0,2 : 90 N/mm² N/mm² (Nominal value has to be specified) RESTRICTIONS Proof Stress Due to the recrystallization of copper with high proof stress values in transformer service ASTA recommends to use silver alloyed copper CuAg0,1 when conductors with a proof stress of R p0,2 240N/mm² are requested. Proof Stress R p0,2 > 170 N/mm² 220 N/mm²: Proof Stress Rp 0,2 >220 N/mm² 280 N/mm²: Thickness of Single Strips: 0,90 4,00 mm Cross section of Single Strips: 36mm² Thickness of Single Strips: 1,00 2,50mm Cross section of Single Strips: 20mm² Transposing factors Transposing factor 5 7: Restrictions: Width of Single Strips: 2,80 10,00mm Thickness of Single Strips: 1,00 2,00 mm Proof Stress R p0,2 : 170N/mm² Transposing factor >7 15: no restrictions If the calculated transposing factor f D is > 15 the pitch will be reduced accordingly in order to guarantee the bundle stability during winding.

3 MATERIALS Page 3/7 Material of Single Strips Cu-ETP material no. CW004A according to EN 1977 CuAg0,10 material no. CW013A according to EN 1977 Insulation of Single Strips LE polyvinylacetal (PVA) based enamels, temperature index 120 LH polyamid-imid enamels, temperature index 200 BL1 standard thermocuring enamel ASTA Epoxy 1, semipolymerized BL2 *) special thermocuring enamel ASTA Epoxy 2, semipolymerized BLC *) special thermocuring enamel ASTA LOW CHIP Epoxy, semipolymerized Increase due to Enamel Insulation Enamel ASTA-Grade 1 Enamel ASTA-Grade 2 BL1 BL2 *) BLC *) increase (both sides) 0,10 ± 0,02mm increase (both sides) 0,13 ± 0,02mm increase (both sides) 0,06 ± 0,02mm increase (both sides) 0,04 ± 0,01mm increase (both sides) only for thickness of single strips: 0,04 ±0,01 mm Material of Interleaving Papers PSP TU125 NX electrical engineering presspan P.4.1 to EN (IEC 641), 0,10; 0,20; 0,30mm thick Cottrell Kraft TU 125 thermally upgraded, 0,127mm thick Nomex type 410 0,08mm thick Material of Bundle Insulation NP type 5A2-1M3 Kraft paper to DIN VDE 0311/35; 0,06 or 0,08mm thick TP type 5B1-2M3 thermally upgraded paper to DIN VDE 0311/35; 0,06 or 0,075mm thick HIHD F type 5B4-2L4 calandered paper to DIN VDE 0311/35; 0,065; 0,08; 0,105mm thick HIHD Z type 5B4-2L4 thermally upgraded, calandered paper to DIN VDE 0311/35; 0,065; 0,085 or 0,105mm thick TU125 Cottrell Kraft TU 125 thermally upgraded, 0,127mm thick HCC Dennison Densilflex 22HCC thermally upgraded crepe paper, 0,076mm thick NX Nomex type 410, 0,05 or 0,08mm thick GSB glass yarn tape, 0,15mm thick GB *) ASTA Netting tape 0,28mm thick GBBL *) ASTA Netting tape 0,28mm thick impregnated with ASTA Epoxy 2 SIR protection insulation with integrated pull-string Increase due to bundle insulation For CTC s ASTA recommends a minimum bundle insulation thickness (both sides) of 0,50mm except when using ASTA-Netting Tape *). The maximal required thickness of bundle insulation is not limited. Other CTC designs on request! *) ASTA patent

4 Page 4/7 CALCULATING BUNDLE DIMENSIONS Transposing Factor WD. π S S= f D = n b 1 Nominal CTC-Dimension Axial Width B B = 2 (b 1 + IL + IE) + ZL + IB Nominal CTC-Dimension Radial Height H odd number of conductors: even number of conductors: n + 1 H = (s 1 + IL + IE) + IB 2 n + 2 H = (s 1 + IL + IE) + IB 2 Tolerance of CTC Bundle Dimensions Axial Width B Radial Height H +0,05/-0,10 mm Transposing Factor f D 7 and Thickness of Single Strips s 1 < 2,00 mm and R p0,2 170 N/mm² number of single strips n tolerance of radial height H 21-0,10 / +0, ,15 / +0, ,20 / +0,80 > 55-0,50 / +1,10 Transposing Factor f D 5 or Thickness of Single Strips s 1 2,00mm or 170 < R p0,2 220 N/mm² number of single strips n tolerance of radial height H 21-0,10 / +0, ,15 / +0, ,20 / +1,30 > 55-0,50 / +1,40 Transposing Factor f D < 5 or R p0,2 > 220 N/mm² to be discussed with ASTA beforehand.

5 Page 5/7 Determination of CTC Dimensions The width and height of the CTC shall be determined with a thickness measuring device using a specific test pressure of 100 N/cm². ABBREVIATIONS USED n b 1 s 1 IL IE ZL IB WD S f D B H number of single strips width of bare single strip thickness of bare single strip nominal increase due to enamel nominal increase due to epoxy coating thickness of interleaving paper nominal increase due to bundle insulation inner winding nominal pitch nominal transposing factor nominal axial width of CTC nominal radial height of CTC DELIVERY CTCs shall be delivered on wood or metal drums. Length Tolerances per drum Lengths per drum have to be specified in the order. Tolerances per drum according to the following table: Length per drum [m] Rp 0,2 120N/mm² Rp 0,2 > 120N/mm² / -0m +3 / -0m > / -0m +5 / -0m > / -0m +10 / -0m

6 Page 6/7 Returnable drums for CTC Drum type Flange Core Outer width Number of compartment s Winding width Bush Tara appr. capacity x x x x x x x x x One-way drums for CTC Drum type Flange Core Outer width Number of compartment s Winding width Bush Tara appr. capacity x x x x x x x x x x x x

7 ORDER FORM Page 7/7

1ZSC AAA EN, REV. 7. Transformer bushings type GSBK Technical guide

1ZSC AAA EN, REV. 7. Transformer bushings type GSBK Technical guide 1ZSC563-AAA EN, REV. 7 Transformer bushings type GSBK Technical guide Original instruction The information provided in this document is intended to be general and does not cover all possible applications.