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| Content Provider | IEEE Xplore Digital Library |
|---|---|
| Author | Hildreth, J. Gillies, D. |
| Copyright Year | 2004 |
| Description | Author affiliation: Carey High Voltage Lab, Bonneville Power Adm., Vancouver, WA, USA (Hildreth, J.) |
| Abstract | One way to increase transmission availability is to perform maintenance while the line is energized. The proposed practices for performing live-line maintenance on the Bonneville Power Administration (BPA) compact 500 kV designs have not been tested. The purpose of this project is to determine the electrical safety margin of these live-line techniques. Full-scale tower models based on BPA's compact 500 kV line design were constructed and tested at the Carey High Voltage Lab in Vancouver, Washington. Switching impulse tests were conducted to determine the critical flashover (CFO) level of each configuration. Several variables were evaluated including insulator type, number of broken units, position of broken units, and presence of tools. A team of experts from maintenance, safety, laboratories, conductor design, and structural design participated in this project from the planning stage to the review of test results. The following conclusions resulted from this collaboration: there is adequate electrical safety margin to replace as many as four broken insulators in a given V-string; the maximum degradation of the tower dielectric strength due to the presence of tools is 9%; the porcelain insulators used for these tests exhibited the same dielectric strength as the glass insulators, even when broken; and the single circuit tower window has 9% higher dielectric strength than the double circuit structure. |
| Starting Page | 445 |
| Ending Page | 450 |
| File Size | 919000 |
| Page Count | 6 |
| File Format | |
| ISBN | 0780384652 |
| DOI | 10.1109/PES.2004.1372836 |
| Language | English |
| Publisher | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Publisher Date | 2004-06-06 |
| Publisher Place | USA |
| Access Restriction | Subscribed |
| Rights Holder | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Subject Keyword | Poles and towers Dielectrics and electrical insulation Dielectric breakdown Electrical safety Circuit testing Availability Performance evaluation Voltage Impulse testing Flashover |
| Content Type | Text |
| Resource Type | Article |
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