Abstract：Gas insulated switchgear (GIS) is a critical component in substations, and its safe operation directly affects the security and reliability of power supply. With the development of PD detection technologies, ultra-high frequency (UHF) detection has become the most widely used insulation monitoring technology in GIS equipment. For online monitoring of GIS equipment, voltage is also an important part of state detection. In recent years, researchers have developed GIS voltage detection systems to achieve wideband monitoring of equipment voltage from power frequency to VFTO. This article proposed a transient voleage-partial discharge composite sensor for GIS equipment, which achieves synchronous detection of GIS equipment voltage, UHF signals, and optical signals. The proposed sensor mainly consists of a plate UHF sensor, integrating a voltage divider electrode, and fluorescent optical fibers are laid on the surface of the ultra-high frequency antenna plate to detect PD optical signals. The structure of composite sensors is more complex compared to traditional UHF or voltage sensors, and there are also more structural parameters to determine. Therefore, an RBFN-SaDE algorithm was designed in this paper to optimize the UHF effective height while constraining the voltage divider electrode. In the designed process, radial basis function networks (RBFN) were used to replace the fitness evaluating FDTD simulation in most self-adaptive differential evolution (SaDE) processes, greatly accelerating the solving speed. Test results demonstrated that the deviation of composite sensor voltage measurement was less than 0.3 dB between 50 Hz~100 MHz, and the average effective height of UHF measurement in 300~1 500 MHz was 13.25 mm, indicating the effectiveness in measuring GIS voltage and PD signals. In this paper, a sensor performance testing platform was built based on a 220 kV GIS equipment. PDs was generated by setting a surface defects on the insulator to verify the detection performance of the designed composite sensor. When applying power frequency and AC superimposed switching impulse voltage to GIS equipment, the composite sensor can effectively measure the voltage and partial discharges in GIS. The UHF and fiber optical signals exhibited a complementarity for the applied surface discharge. Finally, the paper designs an online monitoring system based on proposed composite sensor and applied the system to in field equipment at a substation, achieving online monitoring of voltage and partial discharge during the switching and operation processes of GIS equipment. This research is expected to be helpful for the design and application of online monitoring devices for GIS equipment.
王昊天, 王宇昂, 颜林, 韩旭涛, 李军浩. GIS暂态电压局部放电融合检测技术及其应用[J]. 电工技术学报, 2025, 40(19): 6306-6316.
Wang Haotian, Wang Yuang, Yan Lin, Han Xutao, Li Junhao. GIS Transient Voltage-Partial Discharge Composite Detection and Its Application. Transactions of China Electrotechnical Society, 2025, 40(19): 6306-6316.
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