Essent_Case_Study_2006.pps

522 views

Published on

0 Comments
0 Likes
Statistics
Notes
  • Be the first to comment

  • Be the first to like this

No Downloads
Views
Total views
522
On SlideShare
0
From Embeds
0
Number of Embeds
2
Actions
Shares
0
Downloads
19
Comments
0
Likes
0
Embeds 0
No embeds

No notes for slide
  • (allgemeine Unternehmensvorstellung)
  • Essent_Case_Study_2006.pps

    1. 1. Distribution Network Cable Revitalisation - Essent Case Study - Ing. André Postma Essent Netwerk, Den Bosch (NL) Ir. Peter Derks CableCURE, Germany.
    2. 2. Agenda of this presentation <ul><li>Introduction to Essent and the Essent Medium Voltage Distribution Network </li></ul><ul><li>Structure of the Essent Medium Voltage Distribution Network. </li></ul><ul><li>Downtime in the distribution network: Causes and solutions. </li></ul><ul><li>Solutions for enhancing the reliability of the distribution network. </li></ul><ul><li>Implementation of Cable Revitalisation project. </li></ul><ul><li>Special issues encountered during the project. </li></ul><ul><li>Results of the Cable Revitalisation project. </li></ul><ul><li>Main developments in the Essent Distribution network. </li></ul>
    3. 3. Agenda of this presentation <ul><li>Introduction to Essent and the Essent Medium Voltage Distribution Network </li></ul><ul><li>Structure of the Essent Medium Voltage Distribution Network. </li></ul><ul><li>Downtime in the distribution network: Causes and solutions. </li></ul><ul><li>Solutions for enhancing the reliability of the distribution network. </li></ul><ul><li>Implementation of Cable Revitalisation project. </li></ul><ul><li>Special issues encountered during the project. </li></ul><ul><li>Results of the Cable Revitalisation project. </li></ul><ul><li>Main developments in the Essent Distribution network. </li></ul>
    4. 4. Essent is the largest Dutch Utility 1. Die Essent-Gruppe im Überblick Provinces 74% Municipalities 26% <ul><li>Turnover € 7,413 Mil. </li></ul><ul><li>Sales Power 52.1 TWh </li></ul><ul><li>Production capacity ca. 5,000 MW </li></ul><ul><li>Sales Gas 115.3 TWh </li></ul><ul><li>Employees 11,181 </li></ul>Key figures Essent (2004) Shareholders <ul><li>Production, trading, distribution and sales of electricity </li></ul><ul><li>Trading, distribution and sales of gas including gas storage </li></ul><ul><li>Largest producer of green electricity in The Netherlands </li></ul><ul><li>Outside home market participations in Germany and Belgium </li></ul><ul><li>Cable networks for radio / TV, broadband and telephony </li></ul>Activities Essent
    5. 5. Essent Netwerk is responsible for the power and gas grids of Essent <ul><li>Power </li></ul><ul><li>2,500,000 connections </li></ul><ul><li>3,000 km HV </li></ul><ul><li>140,000 km MV / LV </li></ul><ul><li>50,000 transformer stations </li></ul><ul><li>22.5 min loss of load per year </li></ul><ul><li>Gas </li></ul><ul><li>1,750,000 connections </li></ul><ul><li>20,000 km high and low pressure </li></ul><ul><li>25,000 stations </li></ul>
    6. 6. Agenda of this presentation <ul><li>Introduction to Essent and the Essent Medium Voltage Distribution Network </li></ul><ul><li>Structure of the Essent Medium Voltage Distribution Network. </li></ul><ul><li>Downtime in the distribution network: Causes and solutions. </li></ul><ul><li>Solutions for enhancing the reliability of the distribution network. </li></ul><ul><li>Implementation of Cable Revitalisation project. </li></ul><ul><li>Special issues encountered during the project. </li></ul><ul><li>Results of the Cable Revitalisation project. </li></ul><ul><li>Main developments in the Essent Distribution network. </li></ul>
    7. 7. <ul><li>Medium Voltage Transport Grid. </li></ul><ul><li>Medium Voltage Distribution Grid </li></ul><ul><li>Cables PILC 40.000 km </li></ul><ul><li>XLPE 6.500 km </li></ul><ul><li>overhead lines 0.0 m </li></ul><ul><li>90% = 10 kV 10% = 20 kV </li></ul>The Essent MV Grid is devided into two sections:
    8. 8. GRID MODEL Prim. OMT 0,25 Prim.OMT 0,25 Prim. OMT 0,5 OMT 1 OMT 1 E5 D4 C3 B2 Net 5 Trafo7 Trafo6 Net 1 Net 2 Net 3 Net 4 Net 6 Net 7 Net 8 Net 24 OMT 1 Net 23 Net 25 ZO 600kVA OMT 1 OMT 1 V Net 10 Net 11 Net 14 Net 12 Net 15 Net 16 Net 17 Net 18 Net 19 Net 20 Net 21 Net22 G 150/110 kV 10 kV 1 2 Mainstation HV/MV DIFF+OMT1,5 DIFF+OMT1,5 DIFF+OMT1,5 DIFF+OMT1,5 DIFF DIFF DIFF DIFF Substation MV/MV
    9. 9. The Essent MV Transport Grid cable length varies from 1 to 15 km Grid is 100% maze formed. Is operated under N-1 redundancy conditions Every substation MV/MV feeds one or more distribution feeders or is a industrial customer. Substation MV/MV A B C E F G HV/MV Substation MV/MV Substation HV/MV
    10. 10. Why this structure Cost effective: needs less expensive HV/MV substations more reliable: semi long MV distance transport is N-1 safe but protection system: more complicated Overall: We think this is the best solution: highest reliability at the lowest costs
    11. 11. Agenda of this presentation <ul><li>Introduction to Essent and the Essent Medium Voltage Distribution Network </li></ul><ul><li>Structure of the Essent Medium Voltage Distribution Network. </li></ul><ul><li>Downtime in the distribution network: Causes and solutions. </li></ul><ul><li>Solutions for enhancing the reliability of the distribution network. </li></ul><ul><li>Implementation of Cable Revitalisation project. </li></ul><ul><li>Special issues encountered during the project. </li></ul><ul><li>Results of the Cable Revitalisation project. </li></ul><ul><li>Main developments in the Essent Distribution network. </li></ul>
    12. 12. digging ageing Downtime Causes
    13. 13. PILC 46% 40.000 km XLPE 5% 6.500 km JOINTS 28% 140.000
    14. 14. Agenda of this presentation <ul><li>Introduction to Essent and the Essent Medium Voltage Distribution Network </li></ul><ul><li>Structure of the Essent Medium Voltage Distribution Network. </li></ul><ul><li>Downtime in the distribution network: Causes and solutions. </li></ul><ul><li>Solutions for enhancing the reliability of the distribution network. </li></ul><ul><li>Implementation of Cable Revitalisation project. </li></ul><ul><li>Special issues encountered during the project. </li></ul><ul><li>Results of the Cable Revitalisation project. </li></ul><ul><li>Main developments in the Essent Distribution network. </li></ul>
    15. 15. Enhancing the reliability <ul><li>Reduce amount of faults </li></ul><ul><li>Reduce consequences of faults </li></ul>Introduction of C ondition B ased M aintenance Development of new protection philosophy: Recalculation and readjustment of all relay settings Educate all personnel: Main Focus: Operational Personnel This has mainly effect on item 2: Consequence Reduction
    16. 16. Actions to reduce the amount of faults <ul><li>Introduction of KLIC. This is The Netherlands National Cable and Pipeline Information Center. This forces all contractors to get information of the location of cables and pipes. </li></ul><ul><li>Introduction of more diagnostics to determine the condition of cables and joints like PD, DS, tan  </li></ul>Main question: If you know the condition is bad how to repair ? Lets focus on XLPE
    17. 17. Agenda of this presentation <ul><li>Introduction to Essent and the Essent Medium Voltage Distribution Network </li></ul><ul><li>Structure of the Essent Medium Voltage Distribution Network. </li></ul><ul><li>Downtime in the distribution network: Causes and solutions. </li></ul><ul><li>Solutions for enhancing the reliability of the distribution network. </li></ul><ul><li>Implementation of Cable Revitalisation project. </li></ul><ul><li>Special issues encountered during the project. </li></ul><ul><li>Results of the Cable Revitalisation project. </li></ul><ul><li>Main developments in the Essent Distribution network. </li></ul>
    18. 18. This is the cable we are talking about multi wire core primary insulation (XLPE) graphite semi conductor copper shield PVC cover impregnated paper
    19. 19. <ul><li>Cable is not waterproof </li></ul><ul><li>Leads to water tree forming and all other troubles such as electrical tree </li></ul>electrical tree water tree and finally a break down
    20. 20. <ul><ul><li>new cables should be water-proof </li></ul></ul><ul><ul><li>existing cables ? </li></ul></ul><ul><li>What can we do if the cables have many water trees? </li></ul><ul><ul><li>Wait for breakdown en then repair </li></ul></ul><ul><ul><li>Use diagnostics to find water tree and electrical tree. After that repair the affected places </li></ul></ul><ul><ul><li>Replace whole cable </li></ul></ul><ul><ul><li>Repair cable by CableCURE </li></ul></ul>1. How can we prevent forming of water trees?
    21. 21. <ul><li>The condition and ability of the cable to support the required flow and pressure will be tested </li></ul><ul><li>The fluid is injected into the cable </li></ul><ul><li>The fluid rapidly diffuses from the strands into the insulation </li></ul>The CableCURE revitalization process 1
    22. 22. <ul><li>where it polymerizes with the water in the microvoids and fills them with a dielectric fluid. Since the molecules of the resulting dielectric fluid are much larger than water molecules, they lock into place, retarding the growth of future water trees. </li></ul><ul><li>The cable is tested with 0,1 Hz method </li></ul><ul><li>The cable is re-energized </li></ul>The CableCURE revitalization process 2
    23. 23. How does the CableCURE treatment work Press impregnation fluid (patented Silicone based solution) into the multi wire core Fluid will diffuse into the XLPE and reaches the outer side after some time Fluid will on its way react with water and fills up existing cavities <ul><li>Results: </li></ul><ul><li>growth of water trees stops </li></ul><ul><li>isolation is repaired </li></ul><ul><li>new incoming water will not form water trees </li></ul>
    24. 24. All joints must be replaced The fluid has to pass the joint
    25. 25. Cable injection adapters must be placed The termination has to be opened A valve is placed and de termination recovered * Latest developments: injection through termination connector
    26. 26. HV/MV All cables are 3 x 1 x 400mm 2 year 1978 All cables are 150 mm 2 AL PILC First this cable was replaced After that this cable is impregnated In 1996 this grid had 4 faults per year We expect max. 0,4 This grid transports 17 MW. It provides electrical power for 9.000 customers and some industries. It is N-1 safe The main goal for action is not to decrease the average CML of the whole grid but prevent a disaster for this particular grid. 2350 m 480 m 6741 m 319A 6740 m 319A 7985 m 305A
    27. 27. Some impressions
    28. 28. <ul><li>After first treatment we waited for 6 months because we wanted to be sure the treatment was a success. </li></ul><ul><li>In this period no fault should have occurred, and no fault occurred </li></ul><ul><li>After this period all the remaining XLPE cables of the shown Grid were treated. </li></ul><ul><li>And because the treatment was successful 8 similar Grids followed. </li></ul>Results of first project phase:
    29. 29. Agenda of this presentation <ul><li>Introduction to Essent and the Essent Medium Voltage Distribution Network </li></ul><ul><li>Structure of the Essent Medium Voltage Distribution Network. </li></ul><ul><li>Downtime in the distribution network: Causes and solutions. </li></ul><ul><li>Solutions for enhancing the reliability of the distribution network. </li></ul><ul><li>Implementation of Cable Revitalisation project. </li></ul><ul><li>Special issues encountered during the project. </li></ul><ul><li>Results of the Cable Revitalisation project. </li></ul><ul><li>Main developments in the Essent Distribution network. </li></ul>
    30. 30. <ul><li>Form a special team to perform the job. </li></ul><ul><li>Measure the cables before deciding on treatment. </li></ul><ul><li>Impregnation pressure not to high. Max 4 bar. Max length up to 5 km, and be patient. </li></ul><ul><li>After treatment you also should be patient and not re-energise too soon. </li></ul>Special issues
    31. 31. Agenda of this presentation <ul><li>Introduction to Essent and the Essent Medium Voltage Distribution Network </li></ul><ul><li>Structure of the Essent Medium Voltage Distribution Network. </li></ul><ul><li>Downtime in the distribution network: Causes and solutions. </li></ul><ul><li>Solutions for enhancing the reliability of the distribution network. </li></ul><ul><li>Implementation of Cable Revitalisation project. </li></ul><ul><li>Special issues encountered during the project. </li></ul><ul><li>Results of the Cable Revitalisation project. </li></ul><ul><li>Main developments in the Essent Distribution network. </li></ul>
    32. 32. <ul><li>Between 1999 and 2002 158.930 meter path-length of XLPE-cables have been revitalized </li></ul><ul><li>All cables were 400 mm 2 : age up to 1980 </li></ul><ul><li>749 joints were replaced </li></ul>The Essent South project
    33. 33. <ul><li>After one year the isolation is even better as it was original when the cable is new </li></ul><ul><li>In the pilot grid there was just 1 fault up to now (in 6 years) </li></ul><ul><li>Overall the faults has decreased enormously. There is no difference with new generation XLPE cable anymore </li></ul>Results
    34. 34. Measured Results: CML 5 year average MV in 2005 12 minutes just 9 minutes in southern region
    35. 35. Agenda of this presentation <ul><li>Introduction to Essent and the Essent Medium Voltage Distribution Network </li></ul><ul><li>Structure of the Essent Medium Voltage Distribution Network. </li></ul><ul><li>Downtime in the distribution network: Causes and solutions. </li></ul><ul><li>Solutions for enhancing the reliability of the distribution network. </li></ul><ul><li>Implementation of Cable Revitalisation project. </li></ul><ul><li>Special issues encountered during the project. </li></ul><ul><li>Results of the Cable Revitalisation project. </li></ul><ul><li>Main developments in the Essent Distribution network. </li></ul>
    36. 36. Project: Revitalisation Network North. We have to examine approx. 500 km cable All types: from 3x1x70mm 2 up to 3x1x630mm 2 In order to keep the CML low
    37. 37. Project: PDOL Partial Discharge On Line This is a project in co-operation of all the Dutch utilities, TUE and KEMA The objective is that any failure in its most early phase should immediately notify us of its existence and tell its location, in order to be able to repair it before a breakdown occurs. In order to decrease the CML
    38. 38. Other Topics. <ul><li>Increase cabling HV-grid (EM-radiation standard) </li></ul><ul><li>Increase expected cable-lifespan </li></ul><ul><li>Method for identification and location of cables in the field by GPS </li></ul>
    39. 39. Thank you for your attention !

    ×