3.1 Three-phase power supply 3.2 Connection of three-phase power supply 3.3 Connection of three-phase load 3.4 Power of three-phase circuit Key points of learning Master the relationship between phase voltage (current) and line voltage (current) in symmetrical three-phase circuit; Master the connection and use of load in symmetrical circuit. Master the relationship between phase voltage (current) and line voltage (current) in symmetrical three-phase circuit. A power supply composed of three sinusoidal voltage sources with the same frequency, the same amplitude and a phase difference of 120° is called a three-phase power supply. A circuit powered by a three-phase power supply is called a three-phase circuit.
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