What causes a multimeter to measure 220V voltage but only display 107V?
In this case, the power should be cut off and the cause should be investigated in detail. It can be tested in other people's homes to see if it is normal. Normally it should be around 200 volts to 240 volts. The peak of summer irrigation in rural areas can be as low as about 160 volts. This is the reason for the power supply system. If it is normal to test other people's homes in other places, and the home or one of the roads is not normal, then there is a fault, and it should be ruled out before power supply. In case of fire damage electrical accidents. Focus on checking whether there are reasons such as poor contact, electrical faults, too thin and overloaded electrical overloaded wires, etc. It is best to ask an electrician to help you out. In order to prevent the fault from expanding and hurting people or property.
First, the outside line may be broken due to the zero line. Second, you can use the electric pen to measure the light and darkness to judge. The internal battery of the 30-meter multimeter is insufficient. Take another multimeter for comparison!
First of all, is it possible to use the same multimeter to measure the initial voltage of 220V on A single-phase line of the same general power supply, but to measure the initial voltage of 107V on B single-phase line? , The second question is whether the voltage measured by the same multimeter at the beginning of A single-phase line is 220V, and the voltage measured at the end is 107V?
If using the same multimeter to measure the A single-phase line of the same general power supply, the measured initial voltage is 220V, and the B single-phase line voltage is 107V; then the upper and lower ends of the circuit breaker (switch) of the B single-phase line are respectively The two connection points should be due to poor contact due to oxidation, resulting in an increase in contact resistance and a voltage drop.
If you use the same multimeter to measure the initial voltage of A single-phase line or B single-phase line of the same power supply, the measured voltage is 220V, and the measured end voltage is 107V; then it should be that the line with the measured end voltage of 107V is too long or the line is too long. The load current is greater than the safe current carrying capacity of the line wire, resulting in a voltage drop.
If the voltage measured at the beginning of the single-phase line A and B of the same power source is 107V; then it should be that the capacity of the distribution transformer in the low-voltage distribution station area is much smaller than the power consumption capacity of the user, or the distribution transformer The distribution line from this user is too long and too small to cause a voltage drop.
