基于气体传感器技术的中高压开关柜过温监测系统

HV and MV switch cabinet over-temperature supervising system based on gas sensor

提出了一种利用气体传递过温信号的中高压开关柜过温监测系统。在对几种常用气体进行各方面性能比较的基础上,确定了以CO2作为过温信号的传递载体。在开关柜内易过温点安装CO2存储装置及释放机构。当易过温点的温度超过设定值时气体释放机构动作,释放CO2气体。安装在开关柜内的传感器监测到开关柜内CO2气体体积分数变化后,进行现场和后台告警。给出了系统工作原理及气体存储装置、释放机构和检测装置的具体设计。通过实验室测试和现场试运行的结果验证了系统能够迅速准确地监测到开关柜内的过温状况。

An over-temperature monitoring system is proposed for HV and MV switch cabinets,which transmits the over-temperature signal via gas.Based on the comparison of performance among general gases,the carbon dioxide is selected as the over-temperature signals carrier.Gas storage device and gas releasing mechanism are installed at the point likely to be over-temperature.When the temperature is higher than the set value,the gas releasing mechanism then acts to release CO2.When gas sensor detects the change of CO2 concentration,site and remote alarms will be issued.The operational principle of system and the designs of gas storage device,gas releasing mechanism and gas detection device are given.Both the lab test and site test show that,the system detects the over-temperature of switch cabinet quickly and accurately.