Zero ground voltage is the voltage on the neutral wire n, which can also be thought of as the potential difference between the neutral wire n and the ground wire pe.
Since the ground wire voltage is zero under normal circumstances, the zero ground voltage is the voltage on the zero line, which is Upen as shown in the figure below. Upen=In*Rn, In is the current flowing through the neutral line and Rn is the resistance value of the neutral line.
The commonly used TN-S system (that is, the original three-phase five-wire system) is a power system that strictly separates the working neutral line N and the ground wire PE on the user side. The neutral line is generally not allowed again.
The distance of the energy transmission path determines the length of the neutral line. When the cross section of the neutral line remains unchanged, the length of the neutral line also determinesnt the resistance value of the. neutral line. There is resistance on the neutral line. Once current passes through the neutral line, zero ground voltage is generated.
Detailed information
Earth voltage, equipment electrical When a ground fault occurs, the potential difference between the shell, ground wire and grounding body of the grounding equipment is equal to the zero potential point, called voltage ground when electrical equipment is grounded.
In the electrical system, ground voltage refers to the potential difference between the shell, ground wire and grounding body of the grounding equipment equal to the zero potential point when a ground fault occurs in electrical equipment. Earth is generally defined as the point of zero potential.
Voltage can be divided into positive and negative. Consider the earth as the zero point of electric potential. The ground voltage of +220 V is the zero point voltage.
The neutral wire is the earth wire, which is considered the same as the earth, so the 0 V live wire is the high voltage wire at home, it is 220 V. standards different. Theoretically, you won't get an electric shock just from touching the live wire with your hand, because there should be no continuity.
Thus, the greater the radius of the moving fuse wire without load, the smaller the resistance burned, it is the square of the current multiplied by the value of the resistance and the time. heat is required to blow the fuse, the lower the resistance, the higher the current required.
Reference documents:
Baidu Encyclopedia - Low VoltageReference documents: < /p>Baidu Encyclopedia - Ter Voltagere null