| 摘要 |
PROBLEM TO BE SOLVED: To prevent a circuit breaker from being turned on by mistake during maintenance on power distribution boards when a cable run of each board is in a disconnected and grounded state.SOLUTION: When inter-board cable runs to which boards No.1 to No.3 are electrically connected are disconnected and grounded, a key of the board No.1 is pulled out with a breaker operation switch of the board No.1 in a disconnected state, and a key of the board No.2 is pulled out with a breaker operation switch of the board No.2 in a disconnected state. While the key of the board No.2 and the key of the board No.1 are inserted into a key switches of the board No.2, a grounding switch operation switch of the board No.2 is grounded. Further, while a key of the board No.3 is pulled out with a breaker operation switch of the board No.3 in a disconnected state and the key of the board No.3 and the key of the board No.1 are inserted into key switches of the board No.3, a grounding switch operation switch of the board No.3 is grounded. While the key of the board No.3 is pulled out and a key of a main power generator board, the key of the board No.2, and the key of the board No.3 are inserted into key switches of the main power generator board, a grounding switch operation switch of the main power generator board is grounded to ground cable runs of the board No.1 and main power generator board. |
