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Hmmm, it sounds like other appliances are causing the issues to me, it's just when you switch the cooker on it adds to the total earth leakage the RCD is seeing and trips. The power outage no doubt then powers down some other appliance allowing you to re-set the RCD. Other than that your electrician is talking rubbish. I would recommend changing the board, to get rid of the single RCD for the entire property. My preference is to fit RCBOs, which combine an RCD and Circuit Breaker in 1 unit, so basically you have 1 RCD per circuit. It costs a bit more in parts, but the net result is a much more reliable system