不同通风条件对环网柜凝露现象的影响

Research on RMU Condensation Phenomenon Under Different Ventilation Conditions

凝露现象作为影响电力系统可靠性的因素之一,威胁着电气设备的安全运行。在人工环境气候室内搭建了环网柜实验系统,记录了环网柜壳体全通风、半通风、不通风以及不同环境温湿度条件下,柜体内壁凝露形成时间。结果表明:当环境湿度不变时,在一定环境温度范围内,通风情况下的凝露时间比不通风时要长,且半通风时凝露时间最长,而当环境温度达到一定值时,通风反而会促进凝露形成;凝露时间随环境温度的增加呈现先增大后减小的趋势,且环境相对湿度越低,通风效果越好;存在适宜的环境温度以及通风面积,使得通风条件下的防凝露效果相对较好。

As one of the factors that affect the reliability of the power system, the condensation phenomenon seriously threatens the safe operation of electrical equipment. An experiment system of ring main unit （RMU） is set up in an artificial climate chamber, and the formation time of condensation on the cabinet inner wall is recorded under different conditions of full ventilation, haft ventilation and non-ventilation of the RMU＇ s shell with different ambient temperatures and relative humidity. The results show that, when the ambient humidity is constant within a certain temperature range, the formation time of condensation under ventilation is longer than that under non-ventilation, and the half ventilation has the longest condensation time. When the ambient temperature reaches a certain value, the ventilation, however, can stimulate the formation of condensation. With the increase of ambient temperatures, the formation time of condensation increases before decreasing, and the lower the relative humidity, the better the ventilation effects are. A suitable ambient temperature and ventilation area can make the better effects of anti-condensation under ventilation.