| 摘要 |
A current differential relay (10-90) comprises: an interface section; a quantization section; a communication section; and a difference calculation section. The quantization section quantizes current received by the interface section and converts it to first current data. The communication section, in the case where this relay is a representative current differential relay (30) of a first group (GROUP A), transmits second current data from another current differential relay (10, 20) belonging to the first group (GROUP A) and the first current data jointly to a representative current differential relay (60) belonging to a second group(GROUP B), receives third current data from the representative current differential relay (60) of the second group (GROUP B), and transmits the third current data to the other current differential relays (10, 20) of the first group (GROUP A). A difference calculation section executes a current difference calculation based on the first to third current data. |
