Water-cooled electrical apparatus

Abstract

An objective is to prevent excessive temperature decrease of cooling water and to reduce energy loss by a heater. A water-cooled electrical apparatus includes an electrical device 2 placed indoors, a pump 3 for circulating cooling water for cooling the electrical device, a cooler 5, placed outdoors, for cooling the cooling water, a heater 6 for heating the cooling water, and a main pipe 4 forming a closed loop so that the cooling water circulates through the electrical device, the pump, the cooler, and the heater. The water-cooled electrical apparatus further includes a bypass pipe 11 bypassing between bifurcations 9 and 10, provided at inlet and outlet sides of the cooler, for flow-dividing the cooling water, and at least one of a first flow amount control valve 7 provided along the main pipe between the bifurcations, and a second flow amount control valve 12 provided along the bypass pipe.

1 . A water-cooled electrical apparatus comprising:
 an electrical device placed indoors;   a pump for circulating cooling water for cooling the electrical device;   a cooler, placed outdoors, for cooling the cooling water;   a heater for heating the cooling water;   a main pipe forming a closed loop so that the cooling water circulates through the electrical device, the pump, the cooler, and the heater;   a bypass pipe bypassing between bifurcations, provided at inlet and outlet sides of the cooler, for flow-dividing the cooling water; and   at least one of a first flow amount control valve provided along the main pipe between the bifurcations, and a second flow amount control valve provided along the bypass pipe.   
     
     
         2 . A water-cooled electrical apparatus as recited in  claim 1 , further comprising:
 a water temperature meter for measuring water temperature of the cooling water flowing out from the cooler; and   a controller that receives a signal related to the water temperature from the water temperature meter, and controls, based on the signal, an opening degree of the first flow amount control valve or the second flow amount control valve.   
     
     
         3 . A water-cooled electrical apparatus as recited in  claim 2 , wherein the controller controls in such a way that the higher the water temperature is, the larger the opening degree of the first flow amount control valve is set, or the smaller the opening degree of the second flow amount control valve is set. 
     
     
         4 . A water-cooled electrical apparatus as recited in  claim 1 , wherein both the first flow amount control valve and the second flow amount control valve are provided.