Patent ID: 6954704

Claim:
A digital protection/control device, comprising: a digital data merging unit configured to take in, via a transmission medium, digital output from one sensor unit or a plurality of sensor units detecting AC electricity quantities of main circuits of substation main equipment and to merge the inputted digital data; a protection/control unit configured to output a control signal for at least one of protection and control of said substation main equipment based on the digital data outputted from said digital data merging unit; a communication unit for component control devices configured to transmit to said protection/control unit component monitor data outputted from one component control device or a plurality of component control devices controlling said substation main equipment, and to transmit the control signal outputted from said protection/control unit to said component control device(s), the component monitor data and the control signal being transmitted via a transmission medium; a process bus communication unit configured to relay data to/from at least a part of said protection/control unit, said communication unit for component control devices, and said digital data merging unit from/to an external process bus; and a parallel transmission medium configured to couple at least parts of said digital data merging unit, said protection/control unit, said communication unit for component control devices, and said process bus communication unit to one another, wherein: data exchange among at least parts of said digital data merging unit, said protection/control unit, said communication unit for component control devices, and said process bus communication unit is based on a multimaster mode; and at least parts of said digital data merging unit, said protection/control unit, said communication unit for component control device, and said process bus communication unit have a storage section that stores data and that is allocated to a storage space of a bus coupling at least said parts to each other, and data exchange between at least said parts is conducted in such a manner that data is transferred to the storage section based on the allocation.