高压开关柜复合毛细增容热管蒸发器性能与结构优化

Structure Optimization and Performance of Composite Capillary Heat Exchanger for High Voltage Switchgear

为了满足负荷高峰期的需要,将10kV高压开关柜电流极限值从3 kA提高至4 kA,需增容33.3%。首先,根据热管工作原理与理论技术、工作液属性,结合开关柜内部结构与发热功率,计算了热管正常工作的各项极限数值,设计了高压开关柜动静触头4种增容热管结构;其次,设计了10kV高压开关柜动静触头增容热管温升试验平台,研究了热管绝热段、蒸发段形状、开关柜不同部位的通风面积对开关柜动静触头热管冷却效果的影响。研究结果表明,绝热段为L型的热管冷却效果优于绝热段弯曲型的热管;蒸发段为抱箍型的热管冷却效果优于蒸发段为平板型的热管;开关柜断路器室、母线室、电缆室、前后下门的最优有效通风面积分别为0.3、0.12、0.13、0.07 m2。

In order to meet the requirements of peak load, the current limit of 10kV high voltage switchgear can be increased from 3 kA to 4 k A, thus the capacity should be increased by 33.3%. Firstly, according to the principle and the theoretical technology of heat pipe, combined with the internal structure,the properties of working fluid and the heating power of the switchgear, the limit values of normal operating parameters of heat pipe were calculated, and four kinds of heat pipe cooling structures designed for the switchgear static and dynamic contacts were presented. Secondly, a temperature rise test platform for the switchgear, which were installed with cooling heat pipe device, was designed. The influences of heat pipe insulation section and evaporation section shape on temperature rise of switchgear dynamic and static contacts were studied, respectively. The results show that the cooling effect of the heat pipe including linear insulation section is superior to that of the heat pipe including bending type insulation section. The cooling effect of the heat pipe including hoop type evaporating section is superior to that of the heat pipe including flat type evaporating section. Finally, based on the tests, the optimal effective ventilation areas of the circuit breaker room, bus room, cable room, front, and rear doors were 0.3m2, 0.12 m2, 0.13 m2, and 0.07 m2, respectively.