Good evening. Your understanding of the topic is not entirely correct. In the phase wire, the voltage changes its value from a positive half-wave to a negative one. This can be easily visualized on a sketched circle divided by sex: the upper half is positive and the lower half is negative. This is a generator model representing the principle of the appearance of two half waves.
To understand the three phase voltage, instead of two poles, we introduce three into the generator model. And mentally rotating this three-pole, we see that when there is a maximum wave at one pole, a rising wave at the second, and a falling negative wave at the third. The system has three phases with neutral, the direction of the current in the neutral is mutually compensated, almost absent. If we take a single-phase mobile generator, both wires will be "phase" in it, since there is no antiphase. Owners of autonomous heating are faced with this when connecting gas generators to heating boilers. The protection system goes into blocking, and if one of them is grounded, the problem is solved. We hope we were able to explain about alternating current and voltage.
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