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E. Fred Steennis on behalf of

THE INTRIGUING BEHAVIOUR OVER TIME OF PD'S FROM DEFECTS IN MV CABLES AND ACCESSORIES LESSONS LEARNED WITH SCG, an on-line monitoring system. E. Fred Steennis on behalf of. E.Fred Steennis – Netherlands – Session 1 – Paper 0875. Content. how to measure PD’s on-line in MV cables some results

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E. Fred Steennis on behalf of

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  1. THE INTRIGUING BEHAVIOUR OVER TIME OF PD'S FROM DEFECTS IN MV CABLES AND ACCESSORIES LESSONS LEARNED WITH SCG, an on-line monitoring system E. Fred Steennis on behalf of E.Fred Steennis – Netherlands – Session 1 – Paper 0875

  2. Content • how to measure PD’s on-line in MV cables • some results • lessons learned – the intruiging behaviour of PD’s • conclusions

  3. Content • how to measure PD’s on-line in MV cables • some results • lessons learned – the intruiging behaviour of PD’s • conclusions

  4. up to 8 km CU SIU How to measure PD’s on-line • applied method = SCG • SCG means: Smart Cable Guard

  5. How to measure PD’s on-line • with SCG • diagnose cables (≤ 8 km) • data via internet to KEMA server, 1 h updates • customers have accessto their PD plots • KEMA experts recom-mend on action if needed

  6. Content • how to measure PD’s on-line in MV cables • some results • lessons learned – the intruiging behaviour of PD’s • conclusions

  7. Some results 4 days PILC of 666 m with water at 396 m

  8. Some results 3 weeks XLPE cable of 4.3 km with joint at 1678 m

  9. Some results > 4 weeks XLPE cable of 7 km with various weak spots

  10. Some results top view 3 months PILC of 2.2 km with liquid filled joint at 1794 m

  11. Content • how to measure PD’s on-line in MV cables • some results • lessons learned – the intruiging behaviour of PD’s • conclusions

  12. Lessons learned – PD’s are intruiging How effective is SCG? 4 years SCG 158 km cable monitored 41 defects found in 7 cases (17 %) : no PD at all in 34 cases (83 %) : clear PD activity and time to act SCG is effective in warning for upcoming failures

  13. Lessons learned – PD’s are intruiging SCG . . . . how much time for repair?

  14. Lessons learned – PD’s are intruiging SCG . . . . how much time for repair? water in PILC joints with hot conductor screen interruption in XLPE liquid filled joints in PILC

  15. Lessons learned – PD’s are intruiging SCG . . . . how much time for repair? water in PILC: days*) joints with hot conductor screen interruption in XLPE liquid filled joints in PILC *) between start of heavy PD activity and failure

  16. Lessons learned – PD’s are intruiging SCG . . . . how much time for repair? water in PILC: days*) joints with hot conductor: days*) screen interruption in XLPE liquid filled joints in PILC *) between start of heavy PD activity and failure

  17. Lessons learned – PD’s are intruiging SCG . . . . how much time for repair? water in PILC: days*) joints with hot conductor: days*) screen interruption in XLPE: weeks*) liquid filled joints in PILC *) between start of heavy PD activity and failure

  18. Lessons learned – PD’s are intruiging SCG . . . . how much time for repair? water in PILC: days*) joints with hot conductor: days*) screen interruption in XLPE: weeks*) liquid filled joints in PILC: months - years *) *) between start of heavy PD activity and failure

  19. Content • how to measure PD’s on-line in MV cables • some results • lessons learned – the intruiging behaviour of PD’s • conclusions

  20. Conclusions SCG can diagnose PILC, XLPE or mix up to 8 km, with 1 % length accuracy exp. so far: 4 years; 158 km monitored effective to see defects on time: 83 % ! PD’s from many types of defects only visible for a few days before the failure, in others cases there is (much) more time SCG most effective if monitoring over longer time

  21. THANK YOU FOR YOU ATTENTION

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