Alternating current in a three-phase generator
Hello, I don’t know whether you can answer the question or not, in a three-phase generator, the current is alternating, that is, it changes direction 100 times per second. In a single-phase network, AC is also current. QUESTION: how does the current change its direction from phase to zero and vice versa ?! Practice says that the current is always in phase, at zero it is not.
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Good evening. Your understanding of the topic is not entirely true. In a phase conductor, the voltage changes its value from a positive half-wave to a negative one. This is easy to imagine on a drawn circle divided by gender: 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, we introduce three instead of two poles in the generator model. And mentally rotating this three-terminal network, we see that when the maximum wave is at one pole, the negative wave rises at the second and the decaying 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, here both wires will be “phase” in it, since there are no antiphases. Owners of autonomous heating are faced with this when connecting gas generators to heating boilers. The protection system goes into blocking, and if you ground one of them, the problem is solved. We hope to be able to explain about alternating current and voltage.