AEOLIAN VIBRATION TEST ON 1572 KCMIL BITTERN ACCC/TW CONDUCTOR FOR COMPOSITE TECHNOLOGY CORPORATION

Transcription

1 To: Mr. Dave Bryant Composite Technology Corporation 2026 McGaw Avenue Irvine, CA USA AEOLIAN VIBRATION TEST ON 1572 KCMIL BITTERN ACCC/TW CONDUCTOR FOR COMPOSITE TECHNOLOGY CORPORATION Kinectrics North America Inc. Report No.: K RC-0005-R00 September 29, 2005 C.J. Pon, M.J. Kastelein, M. Colbert Transmission and Distribution Technologies Business 1.0 INTRODUCTION An Aeolian Vibration Test was performed on a sample of inch (34.17 mm), 1572 kcmil, Bittern Aluminum Conductor, Composite Core/Trapezoidal Wire (ACCC/TW) conductor for Composite Technology Corporation (CTC). The conductor consists of a single composite glass and carbon fiber core covered by 3 layers of 39 annealed, trapezoidally-shaped aluminum alloy wires. The composite core is manufactured by CTC and the conductor is stranded by General Cable. The specifications for the conductor are shown in Appendix A. The test was performed between July 28, 2005 and September 14, 2005 by Kinectrics North America Inc. personnel at 800 Kipling Avenue, Toronto, Ontario, M8Z 6C4, Canada under CTC Purchase Order No TEST OBJECTIVE AND STANDARD The objective of the Aeolian Vibration Test is to assess the fatigue performance of the ACCC/TW conductor under typical aeolian vibrations. PRIVATE INFORMATION Contents of this report shall not be disclosed without authority of the client. Kinectrics North America Inc., 800 Kipling Avenue, Toronto, Ontario, M8Z 6C4

2 The test was performed based on IEEE Std , Paragraph This standard describes a procedure for performing an aeolian vibration test on overhead fibre optic ground wire (OPGW). The general procedure is also applicable to overhead conductors of any kind. 3.0 TEST SET-UP The set-up for the Aeolian Vibration Test is shown in Figure 1. The test was performed at room temperature (~20 C) on the span designated KB-North. Test Apparatus The ACCC/TW conductor sample was terminated at both ends using FCI/Burndy outer aluminium sleeves dead-end clamps Part No. YTW52REACCC. The internal steel components were supplied by Composite Technology Corporation. The CTC catalogue numbers for the internal components for the Bittern conductor are Eyebolts , Housings and Collets The dead-end clamps were contained between two intermediate abutments. The active span conductor length was ft (26.49 m) and the passive span conductor length was ft (12.09 m) for a total conductor length of ft (38.58 m) between the load pins of the dead-end clamps. The dead-end clamps installed at the north and south ends of the conductor are shown in Figures 2a and 2b. Fixed end abutments were used to load and maintain tension in the conductor. The initial target tension was 10,250 lbf (4,649 kgf) or 25% of the conductor RTS (41,000 lbf, 18,597 kgf). This was applied using a cantilever weight arm on one of the end abutments. The suspension assembly was supplied by Preformed Line Products. The Part No. was Armor-Grip Suspension AGS The suspension assembly was supported at a height such that the static sag angle of the conductor to horizontal was 1.7 degrees in the active span and 3.8 degrees in the passive span. The suspension clamp installed on the conductor is shown in Figure 3. An electronically-controlled electromagnetic shaker was used to excite the conductor in the vertical plane. The shaker armature was securely fastened to the conductor so that it was perpendicular to the conductor in the vertical plane. The shaker was located in the active span to produce five (5) free vibration loops between the suspension assembly and the shaker. The shaker attached to the conductor is shown in Figure 4. The free loop antinode amplitude of the conductor was measured at the first free loop from the suspension assembly towards the shaker. Instrumentation and Data Acquisition A non-contact, laser micrometer and a V-gage were used to measure the free loop antinode amplitude. A load cell was used to measure the conductor tension. A hand-held digital protractor was used to measure the exit angle of the conductor from the suspension clamp. 2 K RC-0005-R00

3 The peak-to-peak free loop amplitude, vibration frequency, number of cycles, conductor tension and air temperature were recorded every five (5) minutes by a digital data logging system. The measuring instruments used in this test are listed in Appendix B. 4.0 TEST PROCEDURE The key test parameters, namely, conductor tension, vibration frequency, vibration amplitude and test duration, were specified by IEEE Std The conductor was tensioned to 10,250 lbf (4,649 kgf) and the exit angles of the conductor from the suspension clamp were measured on both the active and passive spans. The initial target vibration frequency was 24.3 cps. This is the frequency produced by a ft/s (4.5 m/s) wind (i.e., frequency = 830 diameter of the conductor in mm) for this conductor diameter. The actual vibration frequency during the test was the system resonance that was nearest to the target frequency and also provided good system stability. The target free loop peak-to-peak antinode amplitude was inch (11.4 mm) or one-third of the conductor diameter. This amplitude was maintained at this level in the first free loop from the suspension clamp towards the shaker. The amplitudes in the passive span and the section between the shaker and the dead-end in the active span were not controlled. The conductor and clamp system was subjected to 100 million vibration cycles. 5.0 TEST RESULTS The average values of the data recorded are listed in Table 1. The average vibration loop length is the average of the free vibration loops only. This excluded the vibration loops that included the deadend and suspension clamps and the shaker. A plot of peak-to-peak free loop antinode amplitude and conductor tension versus vibration cycles is shown in Figure 5. Table 1 Average Values of Results Parameter Average Value Conductor Tension 10,368 lbf (4703 kgf) Vibration Frequency 26.4 cps Peak-to-peak Amplitude inch (11.41 mm) Vibration Loop Length Active Span, Dead-end to Shaker 9.02 ft (2.75 m) Vibration Loop Length Active Span, Shaker to Suspension 9.19 ft (2.80 m) Vibration Loop Length Passive Span 9.42 ft (2.87 m) Air Temperature 20 ºC After completion of 100 million vibration cycles, the conductor was subjected to the following assessments. 3 K RC-0005-R00

4 1) A 46 ft (14 m) and a 33 ft (10 m) conductor sample were cut out from the active and passive dead-ends, respectively. The exposed (cut) ends were terminated using an epoxy-resin and steel block housing. Both samples were tension tested to determine the remaining pullout strength. Unfortunately, the active deadend sample failed prematurely in the epoxy housing during loading and therefore is invalid. The passive deadend failed at 39,068 lbf (17,721 kgf) or 95.3% of the RTS of the conductor. This meets the minimum strength requirement of 95% RTS for full tension clamps according to ANSI C ) A 13 ft (4 m) conductor sample containing the suspension was cut. The suspension and conductor were dissected and visually inspected for any damage to the suspension components, the aluminum wires, and/or core material. Photos of the dissected suspension assembly are shown in Figures 6a, b, c, d and e. There was no visual indication of any damage to the suspension components, any of the three aluminum (3) wire layers or the core material. 3) The remaining conductor from the free loops section of the active span was removed. The conductor was dissected and visually inspected for any damage to the aluminum wires, and/or core material. There was no visual indication of any damage to the three aluminum (3) wire layers or the core material. Prepared by M. Kastelein Technical Specialist Transmission and Distribution Technologies Business M. Colbert Technical Specialist Transmission and Distribution Technologies Business C.J. Pon Principal Engineer Transmission and Distribution Technologies Business Approved by: Dr. J. Kuffel General Manager Transmission and Distribution Technologies Business 4 K RC-0005-R00

5 MJK:MC:CJP:JC 5 K RC-0005-R00

6 DISCLAIMER KNAI has taken reasonable steps to ensure that all work performed meets industry standards as set out in KNAI Quality Manual, and that, for the intended purpose of this report, is reasonably free of errors, inaccuracies or omissions. KNAI DOES NOT MAKE ANY WARRANTY OR REPRESENTATION WHATSOEVER, EXPRESS OR IMPLIED, WITH RESPECT TO THE MERCHANTABILITY OR FITNESS FOR ANY PARTICULAR PURPOSE OF ANY INFORMATION CONTAINED IN THIS REPORT OR THE RESPECTIVE WORKS OR SERVICES SUPPLIED OR PERFORMED BY KNAI. KNAI does not accept any liability for any damages, either directly, consequentially or otherwise resulting from the use of this report. Kinectrics North America Inc., K RC-0005-R00

7 Suspension Assembly Hydraulic Ram Deadend Assembly swivel Passive angle Active angle displacement measurement and auto shut off Deadend Assembly Linear Bearing Load Cell cantelever weight arm Shaker (servo controlled) 6 K RC-0005-R00 End Abutment (fixed end) Passive Span Active Span Intermediate Abutment Intermediate Abutment End Abutment (constant tension controlled) Figure 1 Set-Up for the Aeolian Vibration Test data aquisition system

8 Figure 2a North Dead-end Clamp for Aeolian Vibration Test on 1572 kcmil ACCC/TW Figure 2b South Dead-end Clamp for Aeolian Vibration Test on 1572 kcmil ACCC/TW 6 K RC-0005-R00

9 Figure 3 Suspension Clamp for Aeolian Vibration Test on 1572 kcmil ACCC/TW Figure 4 Electromagnetic Shaker for Aeolian Vibration Test on 1572 kcmil ACCC/TW 7 K RC-0005-R00

10 K RC-0005-R00 Antinode Amplitude - inch Pk-Pk Antinode Amplitude Vibration Cycles - millions Aeolian Vibration Test for Composite Technologies Corporation (Ref kcmil ACCC/TW) Figure 5 Vibration Amplitude and Conductor Tension versus Vibration Cycles

11 Figure 6a Dissection of Suspension Assembly for AVT on 1572 kcmil ACCC/TW Figure 6b Dissection of Suspension Assembly for AVT on 1572 kcmil ACCC/TW 9 K RC-0005-R00

12 Figure 6c Dissection of Suspension Assembly for AVT on 1572 kcmil ACCC/TW Figure 6d Dissection of Suspension Assembly for AVT on 1572 kcmil ACCC/TW 10 K RC-0005-R00

13 Figure 6e Dissection of Suspension Assembly for AVT on 1572 kcmil ACCC/TW 11 K RC-0005-R00

14 APPENDIX A DATA SHEET FOR COMPOSITE TECHNOLOGY CORPORATION BITTERN 1572 KCMIL ACCC/TW CONDUCTOR A-1 K RC-0005-R00

15 A-2 K RC-0005-R00

16 ISO-9001 Form: QF11-1 Rev 0, APPENDIX B AVT INSTRUMENT SHEET FOR BITTERN 1572 KCMIL ACCC/TW CONDUCTOR Test Description: Aeolian Vibration Test on Bittern ACCC/TW Conductor Test Start Date: July 28, 2005 Project Number: K Test Finish Date: Sept. 14, 2005 EQUIPMENT DESCRIPTION MAKE MODEL/TYPE ASSET # or SERIAL # CALIBRATION DATE CALIBRATION DUE DATE B-1 K RC-0005-R00 Data Logger National Instruments PCI6034E CA1BF8 Jan. 7, 2005 Jan. 7, 2006 Load Cell Interface 1020AF-50KN-B Load Cell Conditioner Daytronics Apr. 28, 2005 Apr. 28, 2006 Digital Protractor Mitutoyo Pro Feb. 15, 2005 Feb. 15, 2006