| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 725766 | Journal of Electrostatics | 2015 | 5 Pages |
•Aim: evaluate the effect of humid electrode on surface potential decay of PET films.•Experiments performed on 1-mm thick samples of PET films in ambient air.•Samples placed on a grounded humid electrode and charged by negative DC corona.•The humid electrode influences surface potential evolution after corona charging.•Charge injection is the main physical mechanism that explains this potential decay.
Surface potential decay measurement is a widely used tool to test the electrical properties of insulation materials. The aim of the present paper is to evaluate the effect of a humid electrode on the surface potential decay process. The experiments are performed on 1-mm thick samples of PET films (50 mm × 50 mm) in ambient air (temperature: 25 °C–29 °C; relative humidity: 42%–48%). The samples are placed on a grounded humid electrode (aluminum plate covered by a humid textile: 52 mm × 52 mm), and are charged by exposing them for 10 s to the negative DC corona discharge generated by a high-voltage wire-type dual electrode.The results show that the humid electrode has a significant influence on the surface potential evolution during the first moments after corona charging. Bipolar charge injection is the main physical mechanism that explains this potential decay.
