The long-term prequalification (PQ) test of HVDC extruded cable systems according to CIGRE Technical Brochure (TB) 496 consists of a one year long series of “24 hours” load cycles. The duration of this load cycle test relies on a design life of 40 years at constant rated voltage and on an IPM voltage-time characteristic, without any explicit consideration of thermal and synergistic electro-thermal aging effects related to load cycles. Here, as a sequel of a former investigation, a previously proposed method for estimating failure time percentiles of HVDC extruded cables that accounts for the time-varying temperature during the PQ test load cycles is refined. Moreover, the application of the method is broadened for assessing the sensitivity of a typical HVDC cable design to the electrothermal stress levels within insulation thickness, as well as to the variation of insulation resistivity dependence on temperature and electric field.
More insight into the Effects of Load Cycles and Electrothermal Stress on HVDC Extruded Cable Reliability in the Prequalification Test / G. Mazzanti; M. Marzinotto. - ELETTRONICO. - (2013), pp. 1-5. (Intervento presentato al convegno 2013 IEEE Power and Energy Society General Meeting (IEEE PES GM 2013) tenutosi a Vancouver (Canada) nel 21-25 luglio 2013) [10.1109/PESMG.2013.6672421].
More insight into the Effects of Load Cycles and Electrothermal Stress on HVDC Extruded Cable Reliability in the Prequalification Test
MAZZANTI, GIOVANNI;
2013
Abstract
The long-term prequalification (PQ) test of HVDC extruded cable systems according to CIGRE Technical Brochure (TB) 496 consists of a one year long series of “24 hours” load cycles. The duration of this load cycle test relies on a design life of 40 years at constant rated voltage and on an IPM voltage-time characteristic, without any explicit consideration of thermal and synergistic electro-thermal aging effects related to load cycles. Here, as a sequel of a former investigation, a previously proposed method for estimating failure time percentiles of HVDC extruded cables that accounts for the time-varying temperature during the PQ test load cycles is refined. Moreover, the application of the method is broadened for assessing the sensitivity of a typical HVDC cable design to the electrothermal stress levels within insulation thickness, as well as to the variation of insulation resistivity dependence on temperature and electric field.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
