基于传递函数的GIS特高频传感器性能对比评价方法

Property Comparison and Evaluation Method for Ultra-High-Frequency Sensors Installed on GIS Based on Transfer Function

在现有的基于等效脉冲的灵敏度现场校验方法中,难以获取标准化的局部放电等效脉冲,且无法使用一致的脉冲注入方式,从而不能量化评价GIS特高频传感器的性能及其布置方式的合理性。为此,提出基于传递函数的GIS特高频传感器性能对比评价方法。通过测量安装在GIS设备上的相邻两特高频传感器之间的传递函数来评价传感器及其布局方案的合理性。利用此方法,对安装在550 k V GIS设备上的内置式传感器进行了现场校验,发现了传感器失效、布局不合理等问题。该方法对于校验特高频传感器的有效性和布局合理性具有明显的效果,对于保证GIS局部放电检测有效性具有非常重要的意义。

Property and arrangement of Ultra-High- Frequency （UHF） sensors installed on GIS cannot be evaluated quantitatively with existing sensitivity verification method based on equivalent pulse. It is difficult to obtain standard pulse equivalent to some partial-discharges; therefore, no uniform pulse injection method can be used. To solve this problem, a property comparison and evaluation method for UHF sensors installed on GIS based on transfer function is suggested. Performance and arrangement of UHF sensors are evaluated by measuring and comparing transfer functions of every two adjacent UHF sensors installed on GIS. By using this method, some sensors installed on 550kV GISs are evaluated in two substations. A damaged sensor is detected and some poor arrangement is found out. This evaluation method is effective to find out disabled sensors and poor arrangement. This work is of great importance to verify effectiveness of GIS partial discharge detection.