NOYAFA Electronic specializing in testing instruments and cable testers for 16 years
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NOYAFA Electronic specializing in testing instruments and cable testers for 16 years
Author: Noyafa–CCTV Tester
Question: How does the grid form a loop? Answer: A battery and a resistor plus a wire form this simple circuit, which is what we need to learn to build in our elementary school general knowledge class. The teacher said that the current will pass only if a loop is formed. But pay attention to the question: how does the grid form a loop? Answer: A battery and a resistor plus a wire form this simple circuit, which is what we need to learn to build in our elementary school general knowledge class.
The teacher said that the current will pass only if a loop is formed. But note that this is a single-phase DC circuit. What's the difference between this and the grid? The power grid seems to have no loop, from one end to the other.
However, it should be noted that the vast majority of power systems are three-phase AC circuits. This circuit is three-phase, that is, the currents on the three wires have three different phases, which are in turn 120 degrees out of phase. The low-voltage power distribution network, that is, the 220V circuit connected to the home, is also a three-phase AC circuit, but it is usually a three-phase four-wire system.
If the distribution network near your home hasn't been retrofitted and completely buried, you'll see four wires. compared to high-voltage transmission networks. This is due to the asymmetry of the distribution network load.
At this point, the current flowing through the neutral wire is not zero.
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