| 摘要 |
<p>PROBLEM TO BE SOLVED: To stop a snow melt operation for respective strings 5a to 5c where snow melting is completed, and to improve the use efficiency of a system. SOLUTION: Current-sensing means 9a to 9c for sensing currents flowing into strings 5a to 5c are installed for the respective strings 5a to 5c. A determining means 10 for detarmining whether snow melting is completed for the respective strings 5a to 5c, based on the sensed values of the current-sensing means 9a to 9c at a snow melt operation and a control means 11 for controlling the snow melt operation for the respective strings 5a to 5c based on the determined result of the determination means 10 are installed. Accordingly, the snow melting operation of the strings, which determine completion of snow melting, can be stopped.</p> |
