LIFE EVALUATION OF INSULATED WIRES FOR SUBMERSIBLE MOTORS

A unique deterioration phenomenon known as "water-tree" occurs in insulated wires to which voltage is applied in a submerged state. To evaluate the life of insulated wires, we manufactured samples coated with polyethylene (PE), polyvinyl chloride (PVC) and fluorine resin, and subjected them to tests in water applying AC voltages at 50 Hz and 9 kHz. For PE wires, addition of a voltage stabilizer to the polyethylene did not result in improved characteristics; nor did treatment for resistance to stress cracking. Marked improvement was noted in PE wires provided with a metal shielding layer and those with an antitreeing layer. PVC was found resistant to treeing and the breakdown voltage of PVC-insulated wires did not fall much in the test. Absolute life evaluation is difficult, but judging from the residual breakdown voltage after the test, the authors were convinced that their newly developed insulated wire would offer very high reliability.

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/0018277X
• Authors:
  • Hiyashita, T
  • Owada, T
  • Kamata, O
• Publication Date: 1971-5

Media Info

• Features: Figures; Photos; References; Tables;
• Pagination: p. 174-180
• Serial:
  • Hitachi Review
  • Volume: 20
  • Issue Number: 5
  • ISSN: 0018-277X

Subject/Index Terms

• TRT Terms: Electric insulating materials; Insulating materials; Motors; Submersibles
• Old TRIS Terms: Electrical insulation; Submersible motors
• Subject Areas: Marine Transportation; Materials;

Filing Info

• Accession Number: 00028794
• Record Type: Publication
• Source Agency: United States Merchant Marine Academy
• Files: TRIS
• Created Date: Apr 21 1972 12:00AM