| 摘要 |
In a high voltage transmission line system having carrier-current directional relay means connected therewith terminal circuit means are connected with the carrier-current system at remote locations. The carrier-current testing means includes a master or control station and one or more slave terminal circuit means remote from the control station and responsive to the control station for indicating a fault in carrier-current system. The circuit of the control station is actuated at predetermined times and an alarm means is tripped in response to a transmission fault between any two carrier-current stations tested.
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