Han Xutao, Wang Haotian, Sun Yuan, Chen Huan, Meng Xuan, Zhou Yang, Zhang Xuanrui, Li Junhao
National Key Laboratory of Electrical Materials and Insulation, Xi'an Jiaotong University, Xi'an 710049, China.
Rev Sci Instrum. 2024 Aug 1;95(8). doi: 10.1063/5.0204295.
Medium-voltage (MV) switchgear and gas insulated switchgear (GIS) are essential components of power-grid systems. Their safe operation is crucial for the electricity consumption of users. However, insulation faults often occur during the operation of MV switchgear and GIS because of pollution, humidity, heat, mechanical shock, and other factors. Partial discharge (PD) measurements are the most effective indicator to prevent insulation failure. Transient earth voltage (TEV) and ultrasonic methods are the most popular PD measurement methods for switchgear. Currently, these two methods are used widely and independently. In this study, a novel TEV-ultrasonic integrated sensor is proposed based on the independent structure of the TEV and the ultrasonic sensor. The performance parameters of the proposed sensor were tested on test platforms. PD measurement experiments were conducted in a 10 kV switchgear and 220 kV GIS to analyze the performance of the integrated sensor. The results show that the sensor can simultaneously measure the TEV and ultrasonic signals in the same location. The integrated sensor can realize effective and sensitive detection, precise location, and accurate diagnosis of PD in the MV switchgear and GIS.
中压（MV）开关设备和气体绝缘开关设备（GIS）是电网系统的重要组成部分。它们的安全运行对用户的电力消耗至关重要。然而，由于污染、湿度、热量、机械冲击等因素，中压开关设备和GIS在运行过程中经常会出现绝缘故障。局部放电（PD）测量是防止绝缘故障的最有效指标。暂态地电压（TEV）和超声波方法是开关设备最常用的局部放电测量方法。目前，这两种方法被广泛且独立地使用。在本研究中，基于TEV和超声波传感器的独立结构，提出了一种新型的TEV-超声波集成传感器。在所搭建的测试平台上对所提出传感器的性能参数进行了测试。在10 kV开关设备和220 kV GIS中进行了局部放电测量实验，以分析集成传感器的性能。结果表明，该传感器能够在同一位置同时测量TEV和超声波信号。该集成传感器能够实现对中压开关设备和GIS中局部放电的有效、灵敏检测、精确定位和准确诊断。
