i am pursuing b tech in marine engineering. for the final year project i have selected electrostatic coalescer. i need to create a very high potential electric field in which i am having certain trouble. i have doubts regarding the following points: 1. does electric field will still be created if the electrode is insulated. 2. how to generate high potential in an economical way? is there any appliance available which is cheap and also meets our criteria. i need to achieve 20 kv .