Mingotti Alessandro, Costa Federica, Pasini Gaetano, Peretto Lorenzo, Tinarelli Roberto
Department of Electrical, Electronic and Information Engineering, Guglielmo Marconi Alma Mater Studiorum, University of Bologna, Viale del Risorgimento 2, 40136 Bologna, Italy.
Sensors (Basel). 2021 Mar 2;21(5):1719. doi: 10.3390/s21051719.
The use of capacitive dividers (CDs) in medium-voltage (MV) networks started as simple voltage detectors and as rough voltage measurement instruments for protective purposes. Now, with the spread of intelligent electronic devices and renewable energy sources at the distribution level, capacitive dividers are designed and installed to perform accurate voltage measurements. Such a requirement is mandatory when the power quality has to be assessed. Therefore, CDs are currently being used either for power frequency or for high-frequency (supraharmonic- or partial-discharge-level) measurements. In this paper, typical off-the-shelf CDs are studied and modeled to understand how they behave in a wide range of frequencies and when the temperature varies. To this purpose, specific setups and tests have been developed and performed. From the results, it is clear that with proper modeling of CDs, it is possible to exploit them for measuring phenomena in a wide range of frequencies, including the effects due to temperature variations and self-resonances.
电容分压器（CD）在中压（MV）网络中的应用最初是作为简单的电压探测器以及用于保护目的的粗略电压测量仪器。如今，随着智能电子设备和分布式可再生能源的普及，电容分压器被设计和安装用于进行精确的电压测量。当必须评估电能质量时，这样的要求是强制性的。因此，电容分压器目前用于工频或高频（超谐波或局部放电水平）测量。在本文中，对典型的现成电容分压器进行了研究和建模，以了解它们在很宽的频率范围内以及温度变化时的行为。为此，开发并进行了特定的设置和测试。从结果可以清楚地看出，通过对电容分压器进行适当建模，可以利用它们来测量很宽频率范围内的现象，包括温度变化和自谐振所产生的影响。
