摘要
特高压电容式电压互感器(Capacitor Voltage Transformer,CVT)在长期运行中会出现受潮、漏油、电容片劣化等缺陷,若不及时发现处理则可能危害电网安全运行。红外测温是在不停电状态下对CVT进行缺陷诊断的有效手段,然而特高压CVT缺乏缺陷诊断案例与经验,因此需要对特高压CVT不同缺陷时温度分布进行研究分析,从而可以通过红外测温的方式对运行状况进行带电诊断。通过建立特高压CVT三维温度场仿真模型,对不同缺陷时温度分布进行仿真计算,分析讨论了不同缺陷时的温度特征。结果表明,CVT受潮时呈现出整节发热,漏油时呈现出明显的温度分界线,而电容片劣化时会在劣化位置会出现集中热点或温度低点。通过对几种常见缺陷下温度分布特征的对比分析,为特高压CVT的红外诊断提供依据。
UHV capacitor voltage transformer(CVT)will suffer from moisture,oil leakage,capacitor deterioration and other defects in long⁃term operation.If it is not found and handled in time,it may endanger the safe operation of power grid.Infrared detection is an effective means to diagnose the defects of CVT without power failure.However,UHV CVT lacks defect diagnosis cases and experience.Therefore,it is necessary to study and analyze the temperature distribution of UHV CVT with different defects,so that the operation status can be diagnosed by infrared detection.The three⁃dimensional temperature field simulation model of UHV CVT was established,and the temperature characteristics of different defects were simulated and analyzed.The results show that the whole section of CVT is heated when it is wet,and there is an obvious temperature boundary when it is leaking oil.When the capacitor is deteriorated,there will be concentrated hot spots or low temperature points at the deterioration position.The comparative analysis of temperature distribution characteristics under several common defects provides a basis for infrared diagnosis of UHV CVT.
作者
张丕沛
李杰
师伟
王江伟
商攀峰
ZHANG Pipei;LI Jie;SHI Wei;WANG Jiangwei;SHANG Panfeng(Shandong Electric Power Research Institute,Jinan 250003,China;State Grid Shandong Electric Power Research Institute,Jinan 250003,China)
出处
《山东电力技术》
2021年第12期46-50,共5页
Shandong Electric Power
基金
山东电力研究院科技项目“特高压变电站电压致热型设备温度分布研究及红外诊断方法优化”(ZY-2021-13)。
关键词
CVT
缺陷
温度分布
红外测温
CVT
defect
temperature distribution
infrared detection
