Ok that's fine just double checking as ive done it in the past myself.
As to the element tripping it will be a faulty element im afraid. We do get a lot of these doing this as they get moisture in the element while in storage and go down to earth.
There is a trick you can try if you are quite competent at electrics and now a bit what you can try is disconnect the earth on the cooker and run it for 20 mins and see if it drys it out.
But please only do this if you feel competent at it as the oven wont be earthed during this part.
Sometimes this drys it out and stops the tripping out.
Other then that if you can make a fly lead up out of an old mains cable connect the live and netural to the grill element one section at a time as if you look
the grill its in 2 sections the inner and outer.
Once connect run it like that for 20 mins and see if it drys the element out and stops the tripping.
But other then that you need to return the element and get another and fingers crossed that's ok.
As I said we get it a lot on elements its moisture that builds up during storage that causes this.
If you need anymore info just get back to me.