**2.2 Measurements**

The tests were performed on corona-resistant PI tapes (Dupont Kapton 200 CR), having nominal thickness of 50 μm. During the diagnostic sub-cycles, the following quantities were measured/reported (**Figure 4**):


50 V each lasting 30 s. PDIV measurements were repeated eight times, each time changing the position of the rod electrode. The PDIV measurement setup is outlined in **Figure 1**. Samples were discarded after testing.

6.Partial discharge endurance tests were carried out on all the samples. The supply voltage was a 1 kHz unipolar square wave. The peak-to-peak voltage was 7 kV. The rod/plane electrode configuration is the same used in the PDIV tests. Samples were discarded after the tests [18].
