The Experts below are selected from a list of 96 Experts worldwide ranked by ideXlab platform

Prodipto Ghosh - One of the best experts on this subject based on the ideXlab platform.

  • Condition assessment of medium voltage underground PILC cables using partial discharge mapping and polarization index test results
    Conference Record of IEEE International Symposium on Electrical Insulation, 2008
    Co-Authors: Huzainie Shafi Abd Halim, Prodipto Ghosh
    Abstract:

    In general, the main degradation of underground power cable is due to partial discharge and water treeing for both PILC and XLPE type of cable. Partial Discharge can occur primarily in cavities in the insulation of cables and cable accessories. In PILC cable, voids may result due to insulating oil migration due to elevation differences, cracks in the Lead Sheath, incorrect assembly of terminations or splices. Wet can be due to water ingress through a crack in the Lead Sheath of a PILC cable. When partial discharge occurs, it will corrode the insulating material in such away that carbonized path will be formed and grow, then the electrical treeing will take place and Lead to breakdown. However most cable experts are convinced that wet paper insulation does not initially produce Partial Discharge. The probability of failure by moisture penetration in the cable insulation is also dependent on the geographical condition. In such areas where the ground water level is high, if the water barrier in the cable system e.g. splices, is leaking, it will also allow the water to penetrate easily. If the previous cavities within the paper insulation are becoming wet, no partial discharge activity will take place. Moisture ingress in hygroscopic paper insulation will cause adverse affect in the dielectric properties thus changes in the dielectric strength. The breakdown strength of paper insulation is decrease with increase of moisture content. Partial discharge might not detect from this kind of circuit even the breakdown strength has been reducing tremendously.

Abd Halim Mohd Azizi - One of the best experts on this subject based on the ideXlab platform.

  • CONDITION ASSESSMENT OF IN SEVICE MEDIUM VOLTAGE UNDERGROUND PILC CABLES USING PARTIAL DISCHARGE MAPPING AND POLARIZATION INDEX TEST RESULTS
    2020
    Co-Authors: Abd Halim Mohd Azizi
    Abstract:

    In general, the main degradation of underground power cable is due to partial discharge and water treeing for both PILC and XLPE type of cable. Partial Discharge can occur primarily in cavities in the insulation of cables and cable accessories. In PILC cable, voids may result due to insulating oil migration due to elevation differences, cracks in the Lead Sheath, incorrect assembly of terminations or splices. Wet can be due to water ingress through a crack in the Lead Sheath of a PILC cable. When partial discharge occurs, it will corrode the insulating material in such away that carbonized path will be formed and grow, then the electrical treeing will take place and Lead to breakdown. However, most cable experts are convinced that wet paper insulation does not initially produce Partial Discharge. The probability of failure by moisture penetration in the cable insulation is also dependent on the geographical condition. In such areas where the ground water level is high, if the water barrier in the cable system e.g. splices, is leaking, it will also allow the water to penetrate easily. If the previous cavities within the paper insulation are becoming wet, no partial discharge activity will take place. Moisture ingress in hygroscopic paper insulation will cause adverse affect in the dielectric properties thus changes in the dielectric strength. The breakdown strength of paper insulation is decrease with increase of moisture content. Partial discharge might not detect from this kind of circuit even the breakdown strength has been reducing tremendously.

W. Fairechio - One of the best experts on this subject based on the ideXlab platform.

  • Predicting Lead Sheath cable failures
    Conference Record of the 2006 IEEE International Symposium on Electrical Insulation, 2006
    Co-Authors: V.j. Ammirato, J. Silecchia, W. Fairechio
    Abstract:

    Assessing the condition of medium voltage cable and predicting cable performance is an ongoing effort at Con Edison. Some of our cables have been in use for nearly a century and, although the older cables have achieved a remarkable operating record, failure rates of transition joints continue to be a concern. Although Con Edison stopped installing paper insulated Lead covered (PILC) cable in the mid-1980's, it still accounts for 1/3rd of the 19,000 miles underground distribution network cable. Moisture infiltration from the environment is a common cause of insulation deterioration. The Lead Sheath is the first line of defense against moisture intrusion. In underground PILC cable, the Lead Sheath offer? undergoes rigorous wear from the rubbing against the duct material. Once damage has been sustained a path for the moisture is now established. What techniques are available to assess the damage sustained by in-service PILC cables? The Cable and Splice Center For Excellence at Con Edison has been exploring techniques that can be used in the field to assess the condition of the Lead Sheath. This paper presents the laboratory test data and a discussion of the field trial results

J. F. Eckel - One of the best experts on this subject based on the ideXlab platform.

  • Tellurium Alloy Lead Sheath for Power Cable [includes discussion]
    Electrical Engineering, 2020
    Co-Authors: G. B. Shanklin, J. F. Eckel
    Abstract:

    DURING RECENT YEARS there has been a pronounced increase in load requirements and operating temperatures of power cable systems. The accompanying increase in cyclical expansion movement of cable in underground ducts has placed such a severe bending burden on ordinary Sheath, such as copper bearing, that Sheath life no longer can be co-ordinated with insulation life. Alloy Sheaths with greatly improved bending fatigue resistance are a solution of this problem.

Huzainie Shafi Abd Halim - One of the best experts on this subject based on the ideXlab platform.

  • Condition assessment of medium voltage underground PILC cables using partial discharge mapping and polarization index test results
    Conference Record of IEEE International Symposium on Electrical Insulation, 2008
    Co-Authors: Huzainie Shafi Abd Halim, Prodipto Ghosh
    Abstract:

    In general, the main degradation of underground power cable is due to partial discharge and water treeing for both PILC and XLPE type of cable. Partial Discharge can occur primarily in cavities in the insulation of cables and cable accessories. In PILC cable, voids may result due to insulating oil migration due to elevation differences, cracks in the Lead Sheath, incorrect assembly of terminations or splices. Wet can be due to water ingress through a crack in the Lead Sheath of a PILC cable. When partial discharge occurs, it will corrode the insulating material in such away that carbonized path will be formed and grow, then the electrical treeing will take place and Lead to breakdown. However most cable experts are convinced that wet paper insulation does not initially produce Partial Discharge. The probability of failure by moisture penetration in the cable insulation is also dependent on the geographical condition. In such areas where the ground water level is high, if the water barrier in the cable system e.g. splices, is leaking, it will also allow the water to penetrate easily. If the previous cavities within the paper insulation are becoming wet, no partial discharge activity will take place. Moisture ingress in hygroscopic paper insulation will cause adverse affect in the dielectric properties thus changes in the dielectric strength. The breakdown strength of paper insulation is decrease with increase of moisture content. Partial discharge might not detect from this kind of circuit even the breakdown strength has been reducing tremendously.