Protective relaying device
AssigneeKabushiki Kaisha Toshiba
InventorAtsushi Takeuchi
Life of this patent
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Abstract
According to one embodiment, a protective relaying device includes a phase difference calculating unit configured to calculate a phase difference between a phase obtained by shifting a phase of first current data by 180°, and a phase of second current data, a setting unit configured to calculate a target value of elimination of a sampling synchronization error caused by a difference between a transmission delay time of up-transmission, and a transmission delay time of down-transmission on the basis of the phase difference, and to set the calculated target value, and a sampling synchronization control unit configured to carry out control of sampling synchronization such that a difference between a time TM and a time TF.
Claims8
A protective relaying device comprising:
- a measuring unit configured to measure a time TM necessary for a first protective relaying device to receive data of a specific position on a transmission format of a second protective relaying device from a specific position on a transmission format of the first protective relaying device, and a time TF necessary for the second protective relaying device to receive data of a specific position on the transmission format of the first protective relaying device from a specific position on the transmission format of the second protective relaying device;
- a phase difference calculating unit configured to calculate a phase difference between a phase obtained by shifting a phase of first current data input to the first protective relaying device by 180°, and a phase of second current data input to the second protective relaying device;
- a setting unit configured to calculate a target value of elimination of a sampling synchronization error caused by a difference between a transmission delay time of up-transmission, and a transmission delay time of down-transmission on the basis of the phase difference calculated by the phase difference calculating unit, and to set the calculated target value as a target value of sampling synchronization control;
- and
- a sampling synchronization control unit configured to carry out control of sampling synchronization between the first protective relaying device, and the second protective relaying device such that a difference between the time TM, and the time TF which are measured by the measuring unit becomes the target value set by the setting unit.
Dependencies are inferred from the claim text.