615 / 2022-03-30 19:05:40

Effect of Electrode Material on Space Charge in LDPE under continuous polarity inversion DC Field

low density polyethylene,space charge

Purpose/Aim

The space charge effect has always been a key factor restricting the safe operation of polymer insulation. At present, the main methods for suppressing space charge accumulation include nanoparticle doping and special functional group graft modification. However, many studies have shown that factors such as electrode material and contact mode also have an important impact on the space charge distribution characteristics. In order to fill the gap in the research field of the influence of electrode materials on polymer space charge characteristics under reversal DC field,  our research is conducted.

Experimental/Modeling methods

A PEA space charge detection platform based on two different combinations of electrode materials is built to carry out the space charge test of LDPE under continuous polarity inversion DC field.

Results/discussion

The test results show that the average bulk charge densities of the two different combinations of electrode materials under different electric fields have little difference, but in terms of electric field distortion, the maximum electric field distortion rate of the electrode pair with both upper electrode and lower electrode being gold under high electric field(>20kV/mm) is much less than that of the electrode pair with upper electrode being gold and lower electrode being aluminum.

Conclusions

Compared with aluminum electrode, although gold electrode has no significant effect on inhibiting charge injection, it plays a significant role in suppressing electric field distortion.