Is the house DB the main DB? Is the 3-phase earth leakage breaker the 'main breaker'?
If you've got a known tripping fault on an appliance why would you disconnect the earth wire then put power on it and attempt to do live tests? This is dangerous. On top of that the tests you were doing are not relevant and their results are likely to be misleading. Firstly with a stove or oven there's highly likely to be parallel paths to earth, secondly the voltage you measured would be highly likely to vary wildly depending on the input resistance of the particular voltmeter you're using.
If you suspect you've got a faulty element why don't you just disconnect and IR test the element with a mega tester at 500v? You can't accurately localise a fault by using the earth leakage breaker instead of the correct test equipment, you're just going to run yourself around in circles...... I can state with a high degree of certainty that if there's an earth leakage fault on an element it won't make any difference to the likelihood of the earth leakage breaker tripping if the supply voltage is 220v or if it's 240v.
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