1、 TEST METHOD FOR ESTABLISHING VOLUME RESISTIVITY COMPATIBILITY OF WATER BLOCKING COMPONENTS WITH EXTRUDED SEMICONDUCTING SHIELD MATERIALS PUBLICATION ICEA T-32-645-2012 October 10, 2012 2012 by INSULATED CABLE ENGINEERS ASSOCIATION, Inc. Insulated Cable Engineers Assoc., Publication No. T-32-645-Rev
2、ised 2012 TEST METHOD FOR ESTABLISHING VOLUME RESISTIVITY COMPATIBILITY OF WATER BLOCKING COMPONENTS WITH EXTRUDED SEMICONDUCTING SHIELD MATERIALS Published by Insulated Cable Engineers Association Copyright 2012 by the Insulated Cable Engineers Association. All rights including translation into ot
3、her languages, reserved under the Universal Copyright Convention, the Berne Convention for the Protection of Literary and Artistic Works, and the International and Pan American Copyright Conventions. Copyright 2012 by the Insulated Cable Engineers Association, Incorporated. NOTICE AND DISCLAIMER The
4、 information in this publication was considered technically sound by the consensus of persons engaged in the development and approval of the document at the time it was developed. Consensus does not necessarily mean that there is unanimous agreement among every person participating in the developmen
5、t of this document. The Insulated Cable Engineers Association, Inc. (ICEA) standards and guideline publications, of which the document contained herein is one, are developed through a voluntary consensus standards development process. This process brings together persons who have an interest in the
6、topic covered by this publication. While ICEA administers the process and establishes rules to promote fairness in the development of consensus, it does not independently test, evaluate, or verify the accuracy or completeness of any information or the soundness of any judgements contained in its sta
7、ndards and guideline publications. ICEA disclaims liability for personal injury, property, or other damages of any nature whatsoever, whether special, indirect, consequential, or compensatory, directly or indirectly resulting from the publication, use of, application, or reliance on this document. I
8、CEA disclaims and makes no guaranty or warranty, expressed or implied, as to the accuracy or completeness of any information published herein, and disclaims and makes no warranty that the information in this document will fulfill any of your particular purposes or needs. ICEA does not undertake to g
9、uarantee the performance of any individual manufacturer or sellers products or services by virtue of this standard or guide. In publishing and making this document available, ICEA is not undertaking to render professional or other services for or on behalf of any person or entity, nor is ICEA undert
10、aking to perform any duty owed by any person or entity to someone else. Anyone using this document should rely on his or her own independent judgement or, as appropriate, seek the advice of a competent professional in determining the exercise of reasonable care in any given circumstances. Informatio
11、n and other standards on the topic covered by this publication may be available from other sources, which the user may wish to consult for additional views or information not covered by this publication. ICEA has no power, nor does it undertake to police or enforce compliance with the contents of th
12、is document. ICEA does not certify, test, or inspect products, designs, or installations for safety or health purposes. Any certification or other statement of compliance with any health or safety-related information in this document shall not be attributable to ICEA and is solely the responsibility
13、 of the certifier or maker of the statement. ICEA T-32-645-2012 Page i Copyright 2012 by the Insulated Cable Engineers Association, Incorporated. Contents Page FORWARD . ii Section 1 GENERAL . 1 1.1 SCOPE 1 1.2 GENERAL INFORMATION . 1 1.3 DEFINITIONS . 1 Section 2 TEST SPECIMENS . 2 2.1 SPECIMEN PRE
14、PARATION 2 2.2 MEASUREMENT ELECTRODES . 2 Section 3 TEST EQUIPMENT. 3 3.1 MEASURING INSTRUMENT 3 3.2 OVEN 3 3.3 TEMPERATURE RECORDER . 3 Section 4 COMPATIBILITY EVALUATION . 4 4.1 COMPATIBILITY TEST PROCEDURE 4 4.2 PERFORMANCE EVALUATION 4 4.2.1 Volume Resistivity . 4 4.2.2 Volume Resistivity Stabil
15、ity 4 Section 5 APPENDICIES 7 APPENDIX A SPECIMEN PREPARATION PROCEDURE FOR PUMPABLE CONDUCTOR FILLING COMPOUNDS AND WATER SWELLABLE POWDERS . 7 APPENDIX B SPECIMEN PREPARATION PROCEDURE FOR EXTRUDABLE CONDUCTOR FILLER COMPOUNDS, WATER SWELLABLE TAPES, OR WATER SWELLABLE YARNS 10 APPENDIX C VOLUME R
16、ESISTIVITY . 12 ICEA T-32-645-2012 Page ii Copyright 2012 by the Insulated Cable Engineers Association, Incorporated. Foreword This test method for establishing volume resistivity compatibility of water blocking components with extruded semiconducting shield materials, T-32-645, was developed by the
17、 Insulated Cable Engineers Association, Inc (ICEA). ICEA publications are adopted in the public interest and are designed to eliminate misunderstanding between the manufacturer and the user and to assist the user in selecting and obtaining proper product for his particular need. Existence of an ICEA
18、 publication does not in any respect preclude the manufacture or use of products not conforming to the publication. The user of this publication is cautioned to observe any health or safety regulations and rules relative to the manufacture and use of cable made in conformity with this publication. R
19、equests for interpretation of this publication must be submitted in writing to the Insulated Cable Engineers Association, Inc. P.O. Box 2694, Alpharetta, Georgia 30023. An official written interpretation will be provided. Suggestions for improvements gained in the use of this publication will be wel
20、comed by the Association. The members of the ICEA working group contributing to the revision of this publication consisted of the following: P.M. Leblanc Chairman F. Clark E. Bartolucci R. Bristol H. Soleski J. Cancelosi R. Fleming C. Lindler F. Kuchta D. Farrick R. Szilagyi R. Thrash E. Walcott R.
21、Williamson W. Temple B. Crawford C. Spradlin K. Nuckles ICEA T-32-645-2012 Page 1 Copyright 2012 by the Insulated Cable Engineers Association, Incorporated. Section 1 GENERAL 1.1 SCOPE This test method provides procedures for establishing volume resistivity compatibility of water blocking components
22、 with extruded semiconducting shields utilized in MV, HV or EHV power cables. The compatibility test is designed to verify that the electrical properties of a semiconducting material used as a conductor or insulation shield are not adversely affected when exposed to a water blocking component. These
23、 water blocking components can be incorporated in a conductor, over a conductor, over an insulation shield, or around a metallic shield or concentric neutral. It describes a test method of demonstrating that the volume resistivity and volume resistivity stability remain within their specified limits
24、 when a semiconducting material is exposed to a water blocking component at the emergency operating temperature of the cable. 1.2 GENERAL INFORMATION Units in this Standard are expressed in the English system. For information purposes only, their approximate metric equivalents are included. 1.3 DEFI
25、NITIONS Water Blocking Component: A non-metallic material incorporated in a cable construction intended as an impediment to water penetration. A water blocking component can be a pumpable or extrudable conductor filler compound, a water swellable tape, yarn, or powder, or a combination thereof. ICEA
26、 T-32-645-2012 Page 2 Copyright 2012 by the Insulated Cable Engineers Association, Incorporated. Section 2 TEST SPECIMENS 2.1 SPECIMEN PREPARATION The combination of water blocking component and semiconducting shield material are to be prepared as per the appropriate Specimen Preparation Procedure p
27、rovided in Appendices A and B. Appendix A: pumpable conductor filler compounds with conductor shield materials; water swellable powders with conductor and insulation shield materials; Appendix B: extrudable conductor filler compounds with conductor shield materials; water swellable tapes with conduc
28、tor and insulation shield materials; and water swellable yarns with conductor and insulation shield materials. Alternate methods of specimen preparation may be permitted provided the final test specimens fully comply with paragraph 2.2 and that Appendices A and B, as applicable, would serve as a ref
29、eree method. 2.2 MEASUREMENT ELECTRODES Two silver-painted electrodes shall be applied to each side of the semiconducting shield material specimen. The two potential electrodes (inner) shall be at least 2 inches (50.8 mm) apart and shall be 0.125 inch (3.18 mm) minimum width. A current electrode sha
30、ll be placed at least 1 inch (25.4 mm) beyond each potential electrode. When a high degree of accuracy is not required, this test may be made with only two electrodes spaced at least 2 inches (50.8 mm) apart. After the paint has been allowed to dry for at least one hour at room temperature, copper w
31、ires are applied around each silver paint band and twisted to form a tail. Silver paint may be applied to the copper wire to help ensure intimate contact with the electrodes. These copper wires shall be extended to allow resistance measurements of the specimens while at the emergency operating test
32、temperature in an oven. The final test specimens shall be as shown in Figures 1 or 2 based upon the number of electrodes used. ICEA T-32-645-2012 Page 3 Copyright 2012 by the Insulated Cable Engineers Association, Incorporated. Section 3 TEST EQUIPMENT 3.1 MEASURING INSTRUMENT A suitable instrument
33、(e.g., Wheatstone Kelvin Bridge or Ohmmeter) or instruments (e.g., voltmeter and ammeter) shall be utilized for determining resistance and provide a source of 60 Hz ac or dc voltage. The energy released in the conducting component shall not exceed 100 milliwatts. 3.2 OVEN A convection type, forced d
34、raft, circulating air oven, shall be utilized capable of maintaining any constant ( 3C) temperature up to 140C, e.g., Hot Pack Model 120414, Blue M Model OV-490, Precision Type A. 3.3 TEMPERATURE RECORDER A suitable recorder shall be utilized for measuring oven temperature continuously. ICEA T-32-64
35、5-2012 Page 4 Copyright 2012 by the Insulated Cable Engineers Association, Incorporated. Section 4 COMPATIBILITY EVALUATION 4.1 COMPATIBILITY TEST PROCEDURE Five specimens shall be subjected to the stability of volume resistivity test per ICEA Publication T-25-425, “Guide for Establishing Stability
36、of Volume Resistivity for Conducting Polymeric Components of Power Cables.” When testing water blocking components prepared in accordance with Appendix B (extrudable strand filling compounds, water swellable tapes, or water swellable yarns), in order to maintain good contact with the semiconducting
37、shield material during oven aging, a nominal 1400 gram metal plate may be placed on top of each set of five specimens. Polyester sheets shall be used to isolate the specimens electrically from the plate and facilitate resistance measurements. At the conclusion of the stability test, all five specime
38、ns are removed from the oven and allowed to cool at room temperature. An attempt to remove as much as possible of the water blocking component shall be made without any damage to the semiconducting shield material specimens. For the four-electrode method, connect the two outer electrodes (current) i
39、n series with the current source and an ammeter, or the current leads of a bridge. Connect the two inner electrodes (potential) to potentiometer leads of a bridge, or to a voltmeter. A dc or 60 Hz ac source can be used. For the two-electrode method, connect the electrodes to an ohmmeter. The resista
40、nce of the conducting component between the electrodes shall be measured and the volume resistivity is computed as defined in Appendix C, and recorded. 4.2 PERFORMANCE EVALUATION The combination of the water blocking component and the semiconducting shield material is found compatible upon satisfyin
41、g the requirements of 4.2.1 and 4.2.2. 4.2.1 Volume Resistivity The volume resistivity of each specimen shall not exceed the maximum value allowed by the applicable ICEA Standard for the conductor shield or insulation shield material. 4.2.2 Volume Resistivity Stability Stability of volume resistivit
42、y of each specimen shall be demonstrated as defined and computed per ICEA Publication T-25-425. ICEA T-32-645-2012 Page 5 Copyright 2012 by the Insulated Cable Engineers Association, Incorporated. or single layer, as applicable COMPONENT T1 = Water Blocking Component to be minimum 0.010“ thick T1 T3
43、 = Band of Silver Conductive Paint to be 0.125“ wide T2 = Semiconducting shield material to be 0.050“ thick T3 T2 FIGURE 1 1.5” WATER BLOCKING TWISTED WIRE LEADS ELECTRODES 5“ 2“ 0.25“ SHIELD MATERIAL SEMICONDUCTING TWO ELECTRODE METHOD TYPICAL TEST SPECIMEN PREPARATION Where: ICEA T-32-645-2012 Pag
44、e 6 Copyright 2012 by the Insulated Cable Engineers Association, Incorporated. 1“ or single layer, as applicable COMPONENT T1 = Water Blocking Component to be minimum 0.010“ thick T1 T3 = Band of Silver Conductive Paint to be 0.125“ wide T2 = Semiconducting shield material to be 0.050“ thick T3 T2 F
45、IGURE 2 1.5“ WATER BLOCKING TWISTED WIRE LEADS ELECTRODES 5“ 2“ 0.25“ SHIELD MATERIAL SEMICONDUCTING FOUR ELECTRODE METHOD (OPTIONAL) TYPICAL TEST SPECIMEN PREPARATION Where: ICEA T-32-645-2012 Page 7 Copyright 2012 by the Insulated Cable Engineers Association, Incorporated. Section 5 APPENDICIES AP
46、PENDIX A SPECIMEN PREPARATION PROCEDURE FOR PUMPABLE CONDUCTOR FILLING COMPOUNDS AND WATER SWELLABLE POWDERS (NORMATIVE) 1. Mold a 4-inch (10.16 cm) by 5-inch (12.70 cm) nominal 50-mil (1.27 mm) thick slab from the semiconducting shield material. Thickness tolerance 5 mils (0.13 mm). 2. Prepare a te
47、mplate to the same external dimensions of the molded plaque and with a thickness of minimum 10-mils (0.25 mm). A window shall be cut out from the center of the template with internal dimensions of 2.5-inches (6.35 cm) wide by 1.5-inches (3.81 cm) long. 3. The template is to be placed centered over t
48、he molded plaque as shown in Figure A-1 and tightly secured. 4. Obtain a sufficient quantity of conductor filling compound or water swellable powder and place it into the window on the template as shown in Figure A-2. The quantity must be sufficient to completely fill the window after pressing as sh
49、own in Figure A-3. Water swellable powder may be wetted to assist in adhesion to the plaque of semiconducting shield material. 5. Position a sheet of 5-mil (0.13 mm) thick polyester film 4-inch (10.16 cm) by 6-inch (15.24 cm) over the template. 6. Position the slab between 5-mil (0.13 mm) thick polyester film separator sheets, approximately 8-inch (20.32 cm) by 8-inch (20.32 cm). These sheets will prevent excess water blocking component from contaminating the press platens. 7. Place two steel shims of suitable
