电气设备局部过热故障的模拟试验及检测系统

Simulation Test and Detection System of Local Overheating Fault of Electrical Equipment

气体绝缘组合开关(gas insulated switchgear,GIS)和气体绝缘输电管道(gas insulated line,GIL)是电力工程中重要的气体绝缘输电装备。局部过热是这类设备典型故障之一。为了研究GIS/GIL装备内局部过热缺陷引发绝缘气体或气固绝缘系统的老化分解现象,试制了基于比例-积分-微分控制的局部过热故障模拟试验及检测系统,实现了局部过热温度自动测控、功率实测和气体分解产物检测。本系统模拟最大发热功率接近800 W,与实际设备局部发热功率相当;局部高温可达660℃,满足模拟金属导体部件发热损坏的要求;系统具有良好的温度测控能力,400℃时波动值不大于±1℃,625℃时波动值不大于±5℃;发热模块输入电压、电流波动范围不超过±1%,功率波动范围不大于±1.5%。同时通过625℃时C_(4)F_(7)N/CO_(2)气体分解、涉及环氧树脂的气固分解以及400℃时SF6/N2的分解试验,验证了该系统适用于纯气体和气固绝缘系统的局部过热故障模拟。相比于现有研究成果,本系统在故障元件表面温度测控和发热功率等方面具有较大改进,模拟效果更接近气体绝缘装备的实际故障状况。

Gas insulated switch gear(GIS)and gas insulated line(GIL)are important gas insulated transmission equipment in power engineering.Local overheating is one of the typical faults in the GIS and equipment.In order to study the aging and decomposition phenomenon of insulated gas or gas-solid insulation system caused by local overheating defects in GIS/GIL equipment,a local overheating fault simulation test and detection system based on proportional integral differential control was developed,which realized automatic measurement and control of local overheating temperature,power measurement and detection of gas decomposition products.The maximum simulated heating power of the system is close to 800 W,which is equivalent to the local heating power of the actual equipment.The local high temperature can reach 660℃,which meets the requirements of simulating the heating damage of metal conductor parts.The system has good temperature measurement and control ability,the fluctuation value at 400℃is not more than±1℃,the fluctuation value at 625℃is not more than±5℃.The fluctuation range of input voltage and current of heating module is not more than±1%,and the power consumption is less than±1%,the fluctuation range is not more than±1.5%.At the same time,through the decomposition tests of C_(4)F_(7)N/CO_(2) at 625℃,gas-solid decomposition involving epoxy resin and SF6/N2 at 400℃,it is verified that the system is suitable for the local overheating fault simulation of pure gas and gas-solid insulation system.Compared with the existing research results,the system has a great improvement in the surface temperature measurement and control of fault components and heating power,and the simulation effect is closer to the actual fault condition of gas insulated equipment.