In the project, because of the 630 A circuit breaker wiring bar in the 500 kVA box-type transformer, see the second circuit breaker and circuit breaker on the left in the figure. The temperature of this corresponding region is significantly higher than that of the other two corresponding regions, and the other two phases are also hot, and the copper bars of this phase have turned white. There is no induction Delixi clamp meter, and the phase current is not measured. Judging from the phenomenon, it should be the phase error that causes this phase current.
Analysis: There is only one reason why the normally connected line burns out due to high temperature: the line resistance is higher than the normal range!
The reason for wire burning is that there is a large current in the line, but if the resistance of the line is low or not, the temperature of the line will rise at most and will not burn out. So there's nothing inherently wrong with the high current – the question is what makes the line temperature rise suddenly? It's clear - revolt.
Therefore, the conclusion is that the line connection is unreliable, or the line itself has a quality problem, resulting in higher resistance than other lines. But if not, the diameter of the wire is too small, and the whole line is the smallest, so it will burn here.
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