基于有效加热空间的12 kV开关柜加热器布置策略研究

Study on Layout Strategy of 12 kV Switchgear Cabinet Based on Effective Heating Space

通过安装加热器来提升柜内温度是防止开关柜内部绝缘件发生凝露最常用的方法之一。针对现有加热器安装位置不合理和加热过度加剧绝缘件老化等问题,提出了一种基于有效加热空间的12 kV开关柜加热器布置策略。首先,根据凝露的产生机理,建立了露点与室温的对应关系,并对不同类型、功率、安装方式的单个加热器进行了有效加热空间的试验研究;然后,综合各类型加热器的有效加热空间,设计了不同类型加热器的组合方式,在12 kV开关柜内进行了有效温升试验,确定目标温升对应的加热器组合方案;最后,针对某东南沿海省份,利用2019年各区县环境温湿度的气象监测数据,将已确定的温升组合方案进行地区分类,实现了一种区域性的12 kV开关柜加热器差异化布置策略。结果表明,通过该方法确定的加热器布置方式比盲目性的布置方式加热效果更好,温升分布更加均匀。此外,区域性的布置策略能在很大程度上增加各方案的适用性,具有一定的实际参考价值。

The installation of heaters to raise the temperature inside the switchgear cabinet is one of the most common methods to prevent condensation of insulation parts inside the switchgear cabinet.In view of such problem as unreasonable installation position of existing heaters and aging of insulation parts due to excessive heating,a kind of layout strategy of heater for 12 kV switchgear cabinet based on effective heating space is proposed.Firstly,according to the generation mechanism of condensation,the corresponding relationship between dew point and room temperature is set up,and the effective heating space of single heater with different types,power and installation methods is tested and studied.Then,the combination mode of different types of heaters is designed in combination with the effective heating space of various types of heaters.The effective temperature rise test is carried out in 12 kV switchgear cabinet to determine the combination scheme of the heater corresponding to the target temperature rise.Finally,as for the southeast coastal provinces in China,the meteorological monitoring data of environmental temperature and humidity in each district and county in 2019 is used.The defined temperature rise combination scheme is classified as per region,and a regional differential layout strategy of heater of 12 kV switchgear cabinet is achieved.The results show that the layout of the heater defined by this method has better heating effect and more uniform temperature rise distribution than the blind layout.In addition,the regional layout strategy can,to a large extent,increase the applicability of each scheme,which has a certain practical reference.