I am not sure you are on the right track in stating that a high intrinsic breakdown strength makes a material suitable for application where partial discharge is likely. XLPE has a very high intrinsic breakdown strength but performs very badly in the prescence of partial discharges. EPR on the other hand has a lower intrinsic breakdown strenght, but the prescence of fillers makes it more tolerent of partial discharge in insulation systems. On the question of actual breakdown strength, this is a very difficult thing to define. it will depend on the geometry of the insulation system, the volume, and any filler distribution among others. Futher, breakdown strength be it intrinsic or actual is defined by a probability distribution and the figures usually quoted for different materials are very hard to compare due to differences in test technique. Electrode geometry, sample thinkness, and rate of rise of test voltage are key parameters and even if these are the same for the different samples being considered sample preparation can skew the results dramatically.
I know this does not answer your question but hope it gives you food for thought.
I am not sure you are on the right track in stating that a high intrinsic breakdown strength makes a material suitable for application where partial discharge is likely. XLPE has a very high intrinsic breakdown strength but performs very badly in the prescence of partial discharges. EPR on the other hand has a lower intrinsic breakdown strenght, but the prescence of fillers makes it more tolerent of partial discharge in insulation systems. On the question of actual breakdown strength, this is a very difficult thing to define. it will depend on the geometry of the insulation system, the volume, and any filler distribution among others. Futher, breakdown strength be it intrinsic or actual is defined by a probability distribution and the figures usually quoted for different materials are very hard to compare due to differences in test technique. Electrode geometry, sample thinkness, and rate of rise of test voltage are key parameters and even if these are the same for the different samples being considered sample preparation can skew the results dramatically.
I know this does not answer your question but hope it gives you food for thought.
