|
Program 1
1-1
URD Overvoltage Protection
Using full-scale impulse tests on buried URD cable,
classical underground distribution system overvoltage protection theory was validated.
Included were comparisons of SiC and ZnO arrester performance, comparisons of arrester
placement, and mid-span voltage magnification due to taps.
Deliverable: Impulse Testing of
Underground Direct-Buried Cable," Phase I Final Report, 11/15/88.
1-2 URD Overvoltages Considering Transformers and
Grounding
Using full-scale impulse tests, impulse overvoltages on URD
systems were investigated considering: transformer characteristics and secondary currents
due to a poorly grounded primary neutral. Also, a computer-based tutorial on underground
distribution overvoltage protection was created.
Deliverables:
"Application Guidelines: Overvoltage Protection of
Underground Cable Systems," Phases I and II, 2/17/89;
"Distribution Testing Tutorial and Spreadsheet Version
2.0," May 10, 1990;
"Secondary Surge and Jacketed Cable Investigation"
Final Report, 5/14/90.
1-3 Fast and Slow-Front Surges
Using full-scale impulse tests, cable system overvoltages
due to fast and slow-front surges were investigated. Guidelines for mitigation of
lead-length voltage effects were developed.
Deliverable: "Fast and Slow Front
Testing of Jacketed Cable" Final Report, 7/13/90.
|
