| 摘要 |
Disclosed is a duplex system for duplexing a diagnosis unit for diagnosing a state of a high voltage direct current transmission system. The duplex system includes a first device switched into a second device to be replaceable. The first device includes: a communication unit for receiving whether the second device is operated from the second device; and a control unit for determining whether the first device is operated according to the determination result of the second device. |
