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Frankfurt (Germany), 6-9 June 2011 Ger Sebregts – Alliander - The Netherlands – Session 1 Network Components – 0037 Investigation towards the upgrading of existing 10 kV cables and accessories to an operation voltage of 20 kV
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Frankfurt (Germany), 6-9 June 2011 Purpose of the project; Programme; Cable type and construction; Accessory types; Theoretical study; Type test; Long term test; Decision model. Project Summary Investigation towards the upgrading of existing 10 kV cables and accessories to an operation voltage of 20 kV"
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Frankfurt (Germany), 6-9 June 2011 Purpose of this project Major reason to consider upgrading: standardization; To try to approach the limits; Prevent public inconvenience by replacing cable; To indicate the risks for cable and accessories; To demonstrate that the risks can be controlled. Upgrading is risky, but also a challenge.
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Frankfurt (Germany), 6-9 June 2011 Purpose for standardization
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Frankfurt (Germany), 6-9 June 2011 Participants Parties participating in this study are: Liander (grid-company); KEMA; Technical University Delft.
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Frankfurt (Germany), 6-9 June 2011 Cable type and construction 6/10 kV cable; Single Phase, 630 mm² Aluminium; Longitudinal watertightness (#); Copper screen; PE outer sheath (#); 1300 ckm in operation. (#) Combination is supposed to be radial watertight.
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Frankfurt (Germany), 6-9 June 2011 Type of joints Heat shrink 10 and 20 kV; Three manufacturers.
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Frankfurt (Germany), 6-9 June 2011 Programme Step 1. Theoretical study; Step 2. Type testing; Step 3. Long term testing; Step 4. Decision model.
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Frankfurt (Germany), 6-9 June 2011 1. Theoretical study a) Electrical ageing; b) Determine the value of exponent n; c) Possible other effects than electrical ageing; d) The position of the accessories; e) International orientation; f) Risk Analysis; g) Diagnostic selection method.
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Frankfurt (Germany), 6-9 June 2011 1b. The value of n (1) Exponent n (power law) has been evaluated; Values for n between 10-20 are reported; The production of MV cable will be less sophisticated (newly producing countries); For this project the value of n=9 has been chosen.
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Frankfurt (Germany), 6-9 June 2011 1b. The value of n (2) Long term test 5 months
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Frankfurt (Germany), 6-9 June 2011 1d. The position of the accessories The accessories differ from the cable: They are “man made” in the field; Effective testing after installation is not always performed; Unfavourable failure behaviour Consequently accessories have to be tested very seriously!
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Frankfurt (Germany), 6-9 June 2011 1e. International orientation The following experiences are available on this subject: CIGRE WG B1-11 “upgrading of existing cable systems”; Work performed at University of Chemnitz together with utilities in Dresden and Chemnitz; Work performed in China ( University of Xi’an ).
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Frankfurt (Germany), 6-9 June 2011 2. Type testing 20 kV requirements (1) Performed on 10 kV cable & 10/20 kV accessories; To determine (first step), the feasibility upgrading; Only relevant tests (= Electrical tests); If 10 kV accessories will not satisfy the requirements, they will be replaced by 20 kV accessories.
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Frankfurt (Germany), 6-9 June 2011 3. Long term testing Depending on the results of type test this long term test will be performed on 10 or 20 kV accessories; 10 kV kabel (with operational experience of several years) will be tested as follows: During 5 months; Increased voltage 1.7 Uo; Daily heat cycles; PD during the long term test.
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Frankfurt (Germany), 6-9 June 2011 4. Decision model Long term testing: Cable fails, - no upgrading; Accessoires 10 kV fails, - 10 kV cable with 20 kV accessories.
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Frankfurt (Germany), 6-9 June 2011 Status of the programme Step 1. Theoretical study (finalized); Step 2. Type testing (finalized); Step 3. Long term testing (next month); Step 4. Decision model (december 2011).
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Frankfurt (Germany), 6-9 June 2011 Thank you for your attention !! Upgrading of 10 kV XLPE cable to 20 kV
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