1、IEEE Recommended Practice for Space Charge Measurements on High- Voltage Direct-Current Extruded Cables for Rated Voltages up to 550 kV IEEE Std 1732-2017 IEEE Dielectrics and Electrical Insulation Society Sponsored by the Standards Committee IEEE 3 Park Avenue New York, NY 10016-5997 USAIEEE Std 17
2、32-2017 IEEE Recommended Practice for Space Charge Measurements on High- Voltage Direct-Current Extruded Cables for Rated Voltages up to 550 kV Sponsor Standards Committee of the IEEE Dielectrics and Electrical Insulation Society Approved 23 March 2017 IEEE-SA Standards BoardAbstract: The aim of thi
3、s recommended practice is establishing a protocol for the measurement of space charges in high-voltage direct-current (HVDC) extruded cables having rated voltage up to 550 kV. Such measurements are prescribed to be carried out at the beginning and at the end of load cycle qualification tests (either
4、 the long-duration voltage test of prequalification tests or the load cycle test of type tests). The various steps of the protocol for the measurement of space charges in such cables are carefully described. Details are given about the procedure for applying and switching off the voltage, the prepar
5、ation and conditioning of specimens, the measurement times during poling and depolarization, and the calculations for checking electric field stabilization. The ultimate goal of this recommended practice is not verifying the compliance with any maximum acceptable limit of either space charge or elec
6、tric field, but rather assessing the variation of the electric field profile in the cable insulation wall during load cycle qualification tests. Keywords: HVDC extruded insulation, IEEE 1732, power cables, power cable testing, space charge measurements The Institute of Electrical and Electronics Eng
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36、nt of such rights, is entirely their own responsibility. Further information may be obtained from the IEEE Standards Association.6 Copyright 2017 IEEE. All rights reserved. Participants At the time this IEEE recommended practice was completed, the DEI/SC/HVDC Cable Systems Working Group had the foll
37、owing membership: Giovanni Mazzanti, Chair Massimo Marzinotto, Vice Chair Jerome Castellon George Chen John Fothergill Mingli Fu Naohiro Hozumi June-Ho Lee Jian Li Frank Mauseth Peter Morshuis Clive Reed Yasuhiro Tanaka Antonios Tzimas Kai Wu The following members of the individual balloting committ
38、ee voted on this recommended practice. Balloters may have voted for approval, disapproval, or abstention. Ettore Bartolucci William Byrd Jerome Castellon George Chen Namal Fernando John Fothergill Mingli Fu Paul Gaberson Randall Groves Werner Hoelzl Alexander Kraetge Michael Lauxman Jian Li Arturo M
39、aldonado Massimo Marzinotto Frank Mauseth Giovanni Mazzanti Peter Morshuis Clive Reed Yasuhiro Tanaka Antonios Tzimas Kai Wu When the IEEE-SA Standards Board approved this recommended practice on 23 March 2017, it had the following membership: Jean-Philippe Faure, Chair Vacant Position, Vice Chair J
40、ohn D. Kulick, Past Chair Konstantinos Karachalios, Secretary Chuck Adams Masayuki Ariyoshi Ted Burse Stephen Dukes Doug Edwards J. Travis Griffith Gary Hoffman Michael Janezic Thomas Koshy Joseph L. Koepfinger* Kevin Lu Daleep Mohla Damir Novosel Ronald C. Petersen Annette D. Reilly Robby Robson Do
41、rothy Stanley Adrian Stephens Mehmet Ulema Phil Wennblom Howard Wolfman Y u Y uan *Member Emeritus7 Copyright 2017 IEEE. All rights reserved. Introduction This introduction is not part of IEEE Std 1732-2017, IEEE Recommended Practice for Space Charge Measurements on High-V oltage Direct-Current Extr
42、uded Cables for Rated V oltages up to 550 kV . Recently many high-voltage direct-current (HVDC) cable systems with extruded insulation have been installed all over the world (Mazzanti and Marzinotto B13). Since extruded insulation for HVDC cables is strongly affected by trapped space charge, several
43、 space charge measurement methods have been developed since the mid-1980s. So far, space charge measurements have mostly been made using thin, small-size plaques and mini-cables. Much less effort has been devoted to cables of size and design comparable or equal to the full- size cables installed in
44、the field. On the other hand, space charge measurements on full-size cables are of great interest for practical cable systems, as such measurements enable actual service conditions of power cables to be evaluated. Inherent difficulties mainly related to thick insulation make measuring space charge o
45、n full-size cables difficult. However, since the 1990s, satisfactory space charge measurements on large HVDC extruded cables have been described in the literature. Furthermore, space charge measurements on full-size HVDC extruded cable loops have been, and are being, used worldwide in qualification
46、tests for HVDC extruded cable link projects. These measurements are based on project-dependent agreements between cable manufacturers and the customers, as there is no agreed standard procedure. Aiming to fill this gap, in 2015 a position paper prepared by the IEEE DEIS HVDC Cable Systems Technical
47、Committee was published (Mazzanti, et al. B12). The paper illustrates a protocol for the measurement of space charge on full-size HVDC extruded cables during load cycle qualification tests (either the long-duration voltage test of prequalification tests or the load cycle test of type tests). The pro
48、tocol incorporates experience gained in the above-mentioned space charge measurements for HVDC extruded cable system projects. This recommended practice aims at improving this protocol and establishing it as a reference IEEE best practice for the measurement of space charge on full-size HVDC extrude
49、d cables. At the time of writing of this document, the maximum rated voltage of HVDC extruded cable systems commissioned worldwide is 320 kV , but systems with rated voltage up to 525 kV are being qualified. Moreover, in 2012 CIGR issued the Technical Brochure 496 entitled “Recommendations for Testing DC Extruded Cable Systems for Power Transmission at a Rated V oltage up to 500 kV” (see Clause 2). Aiming at accounting for these recent and/or ongoing developments, an upper limit of 550 kV has been selected for the rated voltage of HVDC extruded cables to which the presen
