What is the reason why measuring 220V voltage with a multimeter only shows 107V
In this situation, the power should be cut off and the cause investigated in detail. Can you test it at someone else's house elsewhere and see if it's normal. Normally, it should be around 200V to 240V. During the peak summer irrigation season in rural areas, the voltage can drop to around 160 volts. This is the reason for the power supply system. If other people are normal in other places, or if a single home or one of the roads is abnormal, it is a fault that should be resolved before power is supplied. Electrical accidents caused by fire damage. Focus on checking for poor contact, electrical faults, electrical overload wires being too thin and overloaded, and other reasons. It's best to ask an electrician to help troubleshoot. To prevent the malfunction from expanding and causing harm to people and objects.
One possibility is that the external line may have broken due to the zero line, and the other is that you can use an electric pen to measure the darkness of the light. If the internal battery of a 30000 meter is insufficient, compare it with another 10000 meter!
Firstly, is it possible to measure the starting voltage of 220V using the same multimeter on the A single-phase line of the same main power supply, but 107V on the B single-phase line?, Is it true that the voltage measured with the same multimeter at the beginning of the A single-phase line is 220V, while the voltage measured at its end is 107V?
If using the same multimeter to measure the starting voltage of the A single-phase line of the same main power supply is 220V, and the measured voltage of the B single-phase line is 107V; So the two connection points at the upper and lower ends of the circuit breaker (switch) of the single-phase line B should be due to poor contact caused by oxidation, resulting in an increase in contact resistance and voltage drop.
If using the same multimeter to measure the starting voltage of A single-phase line or B single-phase line of the same power source is 220V, and the measuring terminal voltage is 107V; So it should be that the line with a measured terminal voltage of 107V is too long or the load current on the line is greater than the safe current carrying capacity of the wire, resulting in a voltage drop.
If the voltage measured at the beginning of single-phase lines A and B from the same power source is 107V; So it could be that the capacity of the distribution transformer in the low-voltage distribution station area is much smaller than the electricity consumption capacity of the user, or that the distance between the distribution transformer and the user's distribution line is too long or too small, resulting in voltage drop.
