Why has the voltage at the single-phase socket in the control room increased?
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The power supply to the distribution cabinet is 220V, but the voltage at the control room is 260V. What’s going on?
The voltage in the control room is 260V, which is artificially high and caused by the capacitance rise effect. With a load connected, the voltage drops to around 220V right away! Capacitance rise phenomenon: When the circuit is unloaded, due to the capacitance between the circuit and ground, a voltage higher than the supply voltage appears at the end of the circuit.
No way, it’s necessary to check whether there is a short circuit in the main neutral wire at the point where the three-phase power supply is converted to single-phase power. If such a short circuit exists, it can be dangerous, as it will cause some single-phase devices with higher resistance to experience higher voltages, while those with lower resistance will experience lower voltages.