Justification to Adopt Continuous PD Monitoring in Hydrogenerator Plants
Justification to Adopt Continuous PD Monitoring in Hydrogenerator Plants
2 PagesJustification to Adopt Continuous PD Monitoring in Hydrogenerator Plants Company: ISAGEN Columbia, San Carlos P .S., Jaguas P .S. Machine Description: Hydrogenerator, 16.5 kV, 159 MVA, and 13.8 kV, 90 MVA Toshiba, installed in 1980 San Carlos – 17 start-ups/year, high variation in load and temperature. Jaguas – 235 start- up/year, zero to maximum load reached in 5 minutes Two 80pF couplers per phase installed in 1996 – 1997 Justification to Adopt Continuous PD Monitoring in Hydrogenerator Plants After two years of commercial operation the units at these plants were showing signs of advanced deterioration of the semi-conductive and grading coating systems. Offline tests and inspections determined that PD activity was occurring on approximately 80% of the winding. The coatings were repaired
