Pardo-Vicente Miguel A, Guerrero José M, Platero Carlos A, Sánchez-Férnandez José A
Hydraulic, Energy and Environmental Engineering Department, Universidad Politécnica de Madrid, 28040 Madrid, Spain.
Electric Department, Universidad del País Vasco/Euskal Herriko Unibertsitatea, 48013 Bilbao, Spain.
Sensors (Basel). 2023 Nov 9;23(22):9065. doi: 10.3390/s23229065.
Brushless synchronous machines (BSMs) are replacing conventional synchronous machines with static excitation in generation facilities due to the absence of sparking and lower maintenance. However, this excitation system makes measuring electric parameters in the rotor challenging. It is highly difficult to detect ground faults, which are the most common type of electrical fault in electric machines. In this paper, a ground fault detection method for BSMs is proposed. It is based on an inductive AC/DC rotating current sensor installed in the shaft. In the case of a ground fault in the rotating parts of the BSM, a fault current will flow through the rotor's sensor, inducing voltage in its stator. By analyzing the frequency components of the induced voltage, the detection of a ground fault in the rotating elements is possible. The ground faults detection method proposed covers the whole rotor and discerns between DC and AC sides. This method does not need any additional power source, slip ring, or brush, which is an important advantage in comparison with the existing methods. To corroborate the detection method, experimental tests have been performed using a prototype of this sensor connected to laboratory synchronous machines, achieving satisfactory results.
由于无火花和维护成本较低，无刷同步电机（BSM）正在发电设施中取代传统的带静态励磁的同步电机。然而，这种励磁系统使得测量转子中的电参数具有挑战性。检测接地故障非常困难，而接地故障是电机中最常见的电气故障类型。本文提出了一种用于BSM的接地故障检测方法。该方法基于安装在轴上的感应式交直流旋转电流传感器。在BSM旋转部件发生接地故障的情况下，故障电流将流过转子传感器，在其定子中感应出电压。通过分析感应电压的频率分量，可以检测旋转部件中的接地故障。所提出的接地故障检测方法覆盖整个转子，并能区分直流侧和交流侧。该方法不需要任何额外的电源、滑环或电刷，与现有方法相比，这是一个重要的优势。为了验证该检测方法，使用连接到实验室同步电机的该传感器原型进行了实验测试，取得了令人满意的结果。
