At present, power generation and power supply systems all use three-phase AC. The AC power supply used in daily life is only one phase of the three-phase AC. The three-phase motors used in factory production are powered by three-phase power, and three-phase AC is also called power electricity. This chapter mainly introduces the connection of three-phase AC power supply and three-phase load, as well as the analysis of voltage, current and power, and common sense of safe use of electricity. Chapter 4 Three-phase AC circuits 4.1 Three-phase AC power supply 4.2 Three-phase AC loads 4.2.2 Delta connection of loads 4.2.3 Three-phase power [Example 4.1] Summary of this chapter Chapter 5 Transient analysis of circuits 5.1 Switching rule 5.2 Three-element method of transient analysis 5.2.1 Initial value f(0+) [Example 5.1] [Example 5.2] 5.2.2 Steady-state value f(∞) [Example 5.3] [Example 5.4] 5.2.3 Time constant τ [Example 5.6] 5.2.4 Find any quantity f(t) [Example 5.7] [Example 5.8] 5.3 Differential circuits and integral circuits 5.3.2 Integral circuits Summary of this chapter
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