| 摘要 |
PROBLEM TO BE SOLVED: To make it possible to cut off accident current in a distribution system without operating a feeder breaker by classifying a distribution line into a plurality of sections through a normally closed circuit breaker, which can cut off a load current continued from a re-closer, and connecting the line to another distribution line through a normally closed circuit breaker for linking to a linking point. SOLUTION: When a short-circuit accident or a grounding accident F has occurred in a section I23 of a distribution line L1 at this time, a re-closer RCL 13 cuts off the accident current and stops the electricity of the distribution line. Thus, normally closed circuit breakers S2 and S3 are opened without the voltage. After the specified time, when the re-closer RCL 13 is turned on, the current in a second section I12 of the distribution line is recovered. An RTU 6 detects the recovery and turns on the normally closed circuit breaker S2. Thus, electric power is supplied to the next section I23 . Therefore, the accident section can be automatically separated without tripping a feeder breaker FCB 1 of a transforming station, and the recovery from the accident can be performed at the early stage. Furthermore, the rationalization at the point of the maintenance cost can be achieved. |
