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UHF传感器固定角度和加装屏蔽罩对有效高度的影响 *

1. 1. 国网甘肃省电力公司电力科学研究院 兰州 730070
2. 兰州交通大学自动化与电气工程学院 兰州 730070
• 收稿日期:2019-06-24 出版日期:2019-09-25 发布日期:2019-11-21
• 通讯作者: 田铭兴 E-mail:tianmingxing@mail.lzjtu.cn
• 作者简介:刘康,男,1988年生,硕士。主要研究方向为电气设备绝缘性能与状态评估。E-mail：swjtu3428@126.com
• 基金资助:
* 国家电网甘肃省电力公司科技资助项目(52272217001H)

Effect of Fixed Angle and Outer Shielding Cover on Effective Height for UHF Sensor

LIU Kang1,WEN Dingjun1,BAO Yanyan1,WANG Bixia2,CHEN Bodong1,TIAN Mingxing2()

1. 1. State Grid Gansu Electric Power Research Institute, Lanzhou 730070 China
2. College of Automation & Electrical Engineering, Lanzhou Jiaotong University, Lanzhou 730070 China;
• Received:2019-06-24 Online:2019-09-25 Published:2019-11-21
• Contact: TIAN Mingxing E-mail:tianmingxing@mail.lzjtu.cn

UHF检测法被广泛用于GIS设备放电检测,UHF传感器的性能影响检测结果可靠性。为避免因传感器性能不良造成的检测结果对现场工作指导性不强,需要对不同厂家、不同型号UHF定期开展参数检测工作。为避免不同试验人员获取的传感器有效高度值差异性较大问题,以长方形UHF传感器为对象,试验获取传感器长轴同GTEM小室表面孔之间夹角及传感器外表面加装屏蔽罩前后的有效高度值变化规律。试验结果表明,夹角为90°时对应的有效高度值最小,远小于国网公司规范规定的考核值8 mm,夹角为0°时对应的有效高度值最大,夹角为180°时的有效高度值略低于0°对应值,有效高度值随夹角变化的主要原因在于传感器具有方向性;传感器被屏蔽罩罩住时,有效高度值略有减小,同加屏蔽罩前的数值相比,减小幅值小于6%。研究结果为规范应用GTEM小室获取UHF传感器有效高度值的流程提供参考。

Abstract:

Ultra-high frequency(UHF) detection method is widely used in discharge detection for GIS equipment, the performance of UHF sensor affects the reliability of detection results. In order to avoid the poor performance of the sensor, the test results are not very instructive to the field work, so it is necessary to carry out parameter detection periodically for different manufacturers and different models of UHF. In order to avoid the difference of the effective height of sensors obtained by different experimenters, rectangular UHF sensor is taken as the object, and the angle between the long axis of the sensor and the surface hole of GTEM chamber is obtained, and the change rule of the effective height before and after the shielding cover is installed on the outer surface of the sensor. The test results show that the effective height corresponding to the angle of 90°is the smallest, far less than the assessment value of 8 mm stipulated by the state grid corporation specification, the effective height corresponding to the angle of 0°is the largest, and the effective height value at the angle of 180°is slightly lower than the corresponding value of 0°. The main reason for the change of the effective height value with the angle is that the sensor has directivity. When the sensor is covered by a shield cover, the effective height decreases slightly, and the amplitude decreases by less than 6% compared with that before the shield cover. The research results provide a reference for standardizing the process of obtaining the effective height of UHF sensor by using GTEM cell.