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在“交流电”的教学中,有人曾经把图1中的O_1O_1′线称为地线,或把图2中的O_2O_2′线也称为地线,在个别教科书中也有类似的说法(注一)。图1中的O_1点为中心点,简称中点,O_1O_1′为中线,A_1、B_1、C_1处的端线为相线,俗称火线。图2中O_2点为零点,O_2O_2′为零线,A_2、B_2、C_2处的端线仍称相线。电动机D_1的金属外壳与接地极d_1相连,这种接法叫做“接地保护”,其连线EF称为地线,电动机D_2的外壳与零线相接,这种保护称为“接零保护”。在图3(a)中用地线来代替零线或中线,虽然电灯仍能正常发光,但这种接法却存在着
In the teaching of “AC power”, someone once called the O_1O_1′ line in Figure 1 as a ground line or the O_2O_2′ line in Figure 2 as a ground line. There are similar statements in individual textbooks (Note 1). . The O_1 point in Figure 1 is the center point, abbreviated as the midpoint, O_1O_1′ is the midline, and the end line at A_1, B_1, and C_1 is the phase line, commonly known as FireWire. In Figure 2, the O_2 point is zero, O_2O_2′ is a zero line, and the end lines at A_2, B_2, and C_2 are still called phase lines. The metal housing of the motor D_1 is connected to the ground electrode d_1. This connection method is called “ground protection”. The connection EF is called the ground wire. The outer shell of the motor D_2 is connected to the neutral wire. This protection is called “zero protection”. . In Fig. 3(a), the ground line is used instead of the neutral line or the neutral line. Although the electric light can still emit light normally, this connection method exists.