Recommendations for Testing of Long AC Submarine Cables

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1 Recommendations for Testing of Long AC Submarine Cables Cigré WG B1.27 Gert Aanhaanen Utrecht, 24 mei 2013

2 Stay tuned. Safety first! Voor uw en onze veiligheid vragen wij uw aandacht voor de volgende veiligheidsmaatregelen: In geval van een ontruiming: Volg de aangegeven vluchtroute. Gebruik de trap in plaats van de lift. Ga naar de verzamelplaats. Volg de aanwijzingen op van de bedrijfshulpverlener. Deze is in geval van een ontruiming aanwezig. 2

3 Cigré -TB490- Feb 2012 Introductie Working Group B1.27 Recommendations for Testing of Long AC Submarine Cables with Extruded Insulation for Submarine Voltage above 30 (36) to 500 (550) kv 3

4 Cigré -TB490- Feb 2012 SYSTEM TEST Pre-Qualification Test Water Penetration Test SYSTEM TEST Mechanical Tests Type Test SYSTEM TEST After Installation Test COMPONENT TESTS Routine Tests Sample Tests 4

5 Cigré -TB490- Feb 2012 Recommendations for mechanical tests on submarine cables Electra Electra WG B1.43 (2011) Recommendations for tests of long lengths of extruded cables Electra (170 kv - extruded) Standards for land cables and systems IEC 60840, IEC 62067, TB 303 TB490 - WG B1.27 TB490 follows a System Approach for the whole voltage range > kv

6 Cigré -TB490- Feb 2012 Termination Repair Joint ON-SHORE OFF-SHORE Prefabricated Joint Factory Joint (Flexible) 6

7 Inhoud Testen hoogspanning wisselstroomkabels Lange hoogspanning wisselstroomkabels Aanbevelingen uit de brochure TB490 7

8 Testen hoogspanning wisselstroomkabels Testen belangrijk in verband met kostenstapeling 8

9 Testen hoogspanning wisselstroomkabels Kunststof hoogspanningskabel testen met AC 9

10 Testen hoogspanning wisselstroomkabels Zeekabel net even anders dan landkabel 3f-Kabel Fabrieksverbindingen Armering Watertransport bij beschadiging Reparatie moffen Waterkolom 10

11 Lange HV wisselstroomkabel Wat is een lange HV wisselstroomkabel? 11

12 Lange HV wisselstroomkabel Wind farm HVAC submarine extruded cable projects >170kV Year Country Voltage Area Route Depth [kv] [mm2] [km] [m] 2002 Denmark 170 3x760 Cu Denmark 170 3x630 Cu Belgium 170 3x1000 Al Denmark 170 3x630 Cu Denmark 170 3x800 Cu Canada 245 3x500 Cu Denmark 245 3x1600 Al

13 Lange HV wisselstroomkabel Aansluiting potentiële windparken op de Noordzee 13

14 Lange HV wisselstroomkabel Lange HVAC kabels werken beperkend bij het aansluiting van windparken Met integraal ontwerp tussen windturbine, kabel en net is een lange HVAC kabel toch mogelijk Bron: ABB 14

15 Aanbevelingen technical brochure TB490 Today IEC and ICEA S stipulates Hz for After Installation Test o but new edition of IEC 60060/3 stipulates Hz for onsite testing AC resonant equipment (ACRF) has been used below 20 Hz Longer lengths (high C) and EHV (high U) need some degree of freedom regarding frequency range WG B1.27: longer time duration at lower voltages for factory acceptance and after installation tests compared to IEC may be agreed VLF-testing is not considered mature for HV and EHV WG B1.27 recommends Hz for routine, factory acceptance and tests after installation The lower frequency limit of 10 Hz is important for testing of long lengths 15

16 Aanbevelingen technical brochure TB490 Source: Gockenbach/Hauschild Hz 20 Hz IEC prescribes 20 Hz as lower frequency limit for AC resonant tests. IEC 60060/3 prescribes 10 Hz. The new lower frequency limit in TB490 is set to 10 Hz giving insignificant change in breakdown strength but a 4 times higher load capacity! 16

17 Aanbevelingen technical brochure TB490 Sample tests - In Electra 189 described as Special tests When routine tests are not possible Frequency of tests according to IEC except: If PD-test is not possible on long length (as defined by the WG), impulse and PD-tests shall be performed on samples taken out from start/stop of each extrusion run 17

18 Aanbevelingen technical brochure TB490 For long submarine cables the water penetration tests are divided into three tests: Conductor water penetration test LWPa Metal sheath water penetration test Radial water penetration test of joints LWPb RWP 18

19 Aanbevelingen technical brochure TB490 Mechanical and thermal preconditioning simulate actual installation conditions Water propagation distance is not fixed B1.27 recommendation < 30 m LWPa - conductor Water ingress in the conductor during a cable fault at the deepest part LWPb - metal sheath Water ingress under the metal sheath (reference is made to lead) at the near shore area where the water pressure does not increase the ability to stop water penetration ( 30 m water head) 19

20 Aanbevelingen technical brochure TB490 After installation test Test on new installations are made when the installation has been completed If the complete installed length is too long a reduced test voltage with a longer duration may be agreed. Alternatively, a voltage of U o may be applied for 24 hours Time Domain Reflectometry (TDR) give a fingerprint of the cable system to be used if needed during the cable life 20

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