How to represent the power supply in the circuit diagram

     In the circuit diagram, the power supply is usually arranged on one side or upper or lower part of the circuit. The multiphase power circuit is arranged from top to bottom or left to right in phase sequence; the neutral line is below or to the left of the phase line. The power supply has the following representations.

    1 Use a graphical symbol to indicate the power supply, as shown in Figure 1-40 (a) .

    2 Use the line to indicate the power supply, as shown in Figure 1-40 (b) .

    3Use the voltage value to indicate the power supply, as shown in Figure 1-40 (c) .

    4 The symbol is used to indicate the power supply. When the single line is indicated, the DC symbol is “ - ” and the AC symbol is “~”. When the multi-line is indicated, the DC positive and negative poles are respectively marked with “ + ” and “ - ”; three-phase AC phase The sequence symbols " L1 ", " L2 ", " L3 " and the neutral symbol " N " are shown in Figure 1-40 (d) .

    Figure 1-40 representation of the power supply