Why does the ozone generator have a fire accident?

The discharge voltage of the ozone generator is generally between 3600 V and10000 V. For insulation reasons, the sealing covers (flanges) at both ends of the generator are generally made of plastic (PTFE and PVC), and the shell of the generator is generally made of stainless steel, so that the shell is grounded. The metal shaft (stainless steel) protruding from the flange end cover is a high-voltage terminal, so that the grounding distance between the high-voltage terminal and the shell is very close. When the generator is usually water-cooled, due to the temperature difference, it is easy to generate condensation on the shell and the high-voltage shaft (double water cooling), so that the water connects the high-voltage and the shell on the plastic flange, resulting in arc drawing, and the heat generated by arc drawing makes the plastic melt and catch fire. In addition, the generator is generally filled with pure oxygen, which plays a supporting role, so the plastic end cover will burn quickly, but generally it will not cause other equipment in the power distribution cabinet to catch fire, but will only burn the generator.