GAS-BLAST CIRCUIT BREAKER

摘要

PROBLEM TO BE SOLVED: To detect a back flow of the quantity of flow of gases and prevent the integration of the quantity of back flow. SOLUTION: When the output order of positive-voltage signals or negative-voltage signals output from a flow quantity signal generation part 6 is different from a predetermined output order, a back-flow quantity detection part 9 detects a back flow of the quantity of flow. Since the order of voltages generated from a flow quantity sensor A4 and B5 when the quantity of flow of gases flows backward is different from the order of voltages generated when the quantity of flow of gases flows in a normal direction, it is possible for the back-flow quantity detection part 9 to detect a back flow and acquire an accurate integration value of the quantity of flow of gases by not integrating the quantity of flow of gases at the back flow. COPYRIGHT: (C)2007,JPO&INPIT