Problem of Power supply blow-up

Hello Friends,
I designed a power supply using IGBT in Full Bridge configuration. It works fine when 20V (DC Voltage) is given at the source of the IGBTs, ie at the primary side of transformer it is getting converted into AC (14.144Vrms, +20Vpeak, -20Vpeak). But when I connect 330V at the source of the IGBT, the power from the mains is getting switched off. I have to go and switch ON the trip in the mains board of my house.
I dont know why this happens ? I thought that I would have short circuited somewhere in the primary rectifier side but when I disconnect the IGBT from the primary side rectifier and Capacitors, I get 330V across the capacitors. I don't know what happens. Please anyone help me out!

Thank you !

It's very hard to identify the problem without knowing the details of your circuit, could you please provide us with a schematic?

and photo's of layout