GIS电磁式电压互感器现场交流耐压试验方法分析

Analysis of the field AC voltage withstand testing methods for GIS electromagnetic voltage transformers

气体绝缘金属封闭开关(gas-insulated switchgear,GIS)电磁式电压互感器作为气体绝缘金属封闭开关设备的核心部件,在电力系统中发挥着电压测量、保护计量等功能。现场交流耐压试验作为考验设备内部绝缘的最主要手段,可以有效检测GIS电磁式电压互感器的绝缘性能,避免设备因安装、运输等过程引入的绝缘缺陷。由于电磁式电压互感器本身布置型式及磁饱和的特殊性,受试验条件限制现场交流耐压试验往往无法按额定绝缘水平进行考核。本文从设备结构及布置型式出发,分析GIS电磁式电压互感器连同主回路进行交流耐压试验的可行性,提出现场交流耐压试验方法,并在363 kV GIS电磁式电压互感器交流耐压试验场景实际应用,验证了方法的有效性,为规范GIS设备电磁式电压互感器现场交流耐压试验提供依据。

As a core component of gas-insulated metal-enclosed switchgear,GIS electromagnetic voltage transfor-mers play roles in voltage measurement,protection,and metering within power systems.Field AC voltage withstand testing is the primary method for assessing the internal insulation of equipment,effectively detecting the insulation performance of GIS electromagnetic voltage transformers and preventing insulation defects introduced during installation and transportation.Due to the unique layout and magnetic saturation characteristics of electromagnetic voltage transformers,field AC voltage withstand testing often cannot be conducted at the rated insulation level due to testing condition limitations.This paper analyzes the feasibility of conducting AC voltage withstand tests for GIS electromagnetic voltage transformers along with the main circuit,based on the equipment structure and layout.It proposes a field AC voltage withstand testing method,and the method's effectiveness is validated through practical application in AC voltage withstand testing scenarios for 363 kV GIS electromagnetic voltage transformers,providing a basis for standardizing field AC voltage withstand tests for GIS equipment.