Department of Electrical Engineering, Universidade Federal de Campina Grande, Aprigio Veloso 882, Campina Grande 58429-900, Brazil.
Sensors (Basel). 2019 Feb 5;19(3):653. doi: 10.3390/s19030653.
In this paper, the design and development of a bio-inspired UHF sensor for partial discharge detection in power transformers is presented. The UHF sensor was developed for external use in dielectric windows of power transformers. For this purpose, a microstrip antenna was designed with a radiating element shape based on the leaf of the plant. Then, an epoxy coating and an aluminium enclosure were developed to protect the antenna against corrosion and to provide mechanical support, external noise immunity, and a lifetime compatibility with power transformers. In order to verify the electrical parameters of the developed sensor, measurements of the gain and the reflection coefficient were performed in an anechoic chamber. Lastly, the antenna sensitivity for denominated partial discharge (PD) detection was compared with the IEC 60270 standard method. For this purpose, simultaneous tests were carried out in a partial discharge generator setup, composed of an oil cell with needle-plane electrodes. The experimental tests demonstrated the effectiveness of the sensor for detecting PD signals with apparent charge values higher than 35 pC.
本文提出了一种用于电力变压器局部放电检测的仿生超高频传感器的设计和开发。该超高频传感器专为电力变压器的介电窗外部使用而开发。为此，设计了一种微带天线，其辐射元件形状基于 的叶子。然后，开发了一种环氧树脂涂层和一个铝制外壳，以保护天线免受腐蚀，并提供机械支撑、外部噪声免疫力以及与电力变压器的长期兼容性。为了验证所开发传感器的电气参数，在消声室中进行了增益和反射系数的测量。最后，将所提出的天线对局部放电（PD）检测的灵敏度与 IEC 60270 标准方法进行了比较。为此，在由针-板电极组成的油室局部放电发生器装置中进行了同步测试。实验测试表明，该传感器对于检测明显电荷值高于 35 pC 的 PD 信号非常有效。
