The cable has been used for more than one hundred years. As an important form of energy for social development, power supply is crucial. All kinds of telephone poles have been spread all over every corner of human society. But did you find that most of the wires and cables on the poles are three wires.
This is because my country's high-voltage AC transmission uses a three-phase three-wire system, so there are three wires. The three wires are the three-phase electricity from the step-up transformer, and their phase difference is 120 degrees, which can facilitate the rotation of the three-phase motor, and can also be divided into three routes to provide lighting.
Of course, the lighting circuit also needs a neutral line, which is obtained by star connection when the user terminal is stepped down. That is, the three-phase high-voltage power is connected to the head of the three-phase transformer winding, and the three tails are connected together to form a neutral line.
Our country's 10KV, 110KV, 220KV. The 500KV high-voltage transmission lines do not have a neutral wire, because these voltage levels cannot be directly used for equipment, so our daily electricity consumption is actually a three-phase 4-wire system, that is, three live wires and a neutral wire. The role of the neutral wire It is to act as a neutral wire, which is connected with the live wire to form a phase voltage, and then another role is to act as a neutral grounding for some equipment.
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