| 摘要 |
PURPOSE:To make the capacity of a capacitor small and to miniaturize the capacitor by providing a sensor detecting voltage and current at a specific position of a distribution line, a rectifier, a failure detection part, a capacitor charged through a rectifier, a data transmission part for transmission to a host station by receiving power supply from the capacitor after service interruption, and a service interruption detector. CONSTITUTION:When there is no failure in a distribution line 2, a capacitor 8 is charged, power is supplied to a failure detection part 9A and a data transmission part 9B, and data 10 is transmitted to a host station 12 through the data transmission part 9B. A breaker 3 is tripped by a ground failure, etc., and when electric power to a distribution line 2 fails, a switch 15 in a power line l1 is automatically opened by a service interruption detector 16, and an output of the capacitor 8 is supplied only to the data transmission part 9B through a power line l2. According to the constitution, the capacitor 8 can be miniaturized and its capacity can be made small. |
