Problem solved. Found that when dryer was wired from unit to breaker box someone didn't have enought wire to mak the run I guess and had spliced wire to complete job. Replaced wire and all is fine. It's amazing what folks will do.

Breaker trips after running electric dryer 8-10 minutes. Have taken panel off and no burnt or broken wires. Have tested parts and all are good. Checked element and continuity through it and removed it and all looks good. Had electrician change to different breaker in box and still the same. Any ideas on problem? Thanks