There was a sudden power outage at home, so I went to find a property. The property manager checked the transformer room, but the main gate of the transformer room jumped. What is the reason?

What is the reason for the sudden power outage at home to find a property, and the property inspection and distribution room made the door of the distribution room jump? Generally speaking, if there is no grounding, the electricity consumption of each household is relatively large, which knocks down the trip point of the slave switch, so the slave switch trips. This situation should be visible. Reduce electricity consumption, check that the total current meets the requirements, and the main switch will not trip.