关于对称三相电路无功功率测量的讨论

Discussion on Reactive Power Measurement of Symmetric Three Phase Circuits

三相电路功率及其测量是电路教学中三相电路部分的重要内容。本文结合教学实践讨论了教科书中的对称三相电路无功功率测量的两种方法,指出这两种方法都与三相电路的相序及电路的接法有关。通过在三相电路中接入由电容构成的对称三相负载,给出了在未知三相电路相序的情况下用功率表测量相序的方法。进一步讨论了测量对称三相电路功率的方法,该方法有别于教科书所介绍的方法。

Power of symmetric three phase circuits and its measurement is important content in circuit teaching. This paper discusses two methods of reactive power measurement of symmetric three phase circuits. Application of these methods are related the phase sequence of the circuits. Phase sequence measurement circuit is given by adding a symmetric three phase load which is made up of capacitors. Furthermore the average power measurement of symmetric three phase circuits is discussed and the measurement method is different from that in textbooks.