Substation secondary device requires environmental temperature. The ideal operation temperature is 20.0℃ to 25.0℃. Traditional radiating solution for secondary precast bin was introduced. And the drawback was indicated. This paper introduced a composite radiating solution that combined air conditioner and fan. This solution featured with well heat balance, high reliability, and remarkable energysaving effect.

precast cabin, capillary module, radiating air duct, energysaving