Current differential relay
AssigneeMitsubishi Electric Corporation
InventorKeigo ADACHI
Life of this patent
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Abstract
An output unit outputs a trip current based on current amount data obtained by sampling a current amount at a first end of a power line at a predetermined timing and current amount data received from a device at a second end of the power line. A clock generating unit generates a clock to be used as a reference for the predetermined timing. A receiving unit receives a GPS signal and extracts a time synchronization signal from the GPS signal. A correction-signal generating unit generates a correction signal for synchronizing the clock with the time synchronization signal. A correcting unit corrects the clock with the correction signal.
Claims4
A current differential relay comprising:
- an output unit that outputs a trip current based on current amount data obtained by sampling a current amount at a first end of a power line to be protected at a predetermined timing and current amount data received from a device at a second end of the power line;
- a clock generating unit that generates a clock to be used as a reference for the predetermined timing;
- a receiving unit that receives a global positioning system signal and extracts a time synchronization signal from the global positioning system signal;
- a correction-signal generating unit that generates a correction signal for synchronizing the clock with the time synchronization signal;
- and
- a correcting unit that corrects the clock with the correction signal.
Dependencies are inferred from the claim text.