In three-phase four wire circuit, the voltage between the phase line and the middle line is phase voltage, the voltage between any two phase lines is line voltage, and the line voltage is 3 times of the phase voltage. The current passing through the phase load is the phase current; the current passing through the phase line is a line current. 7. 变压器在电力系统中主要作用是什么？ 7., what are the main functions of transformers in power system 答：主要作用是变换电压，以利于功率的传输。
Answer: the main role is to transform voltage to facilitate power transmission. On the same line, the same power is transmitted. After the voltage is boosted by the boost transformer, the transmission current of the line is reduced, which can reduce the loss of the line, improve the power supply economy, and reach the pur*e of long distance transmission, while the depressurization can meet the needs of the users at all levels. 标签： JG电机 JG硅橡 JGG高 JG电机引接线 JG硅橡胶电机引接线 JGG高压电机引接线 淮安市型电机引接线 淮安市型电机引接线厂家 [JG电机引接线
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