Method of detecting electrical disturbance by DC component
AssigneeLsis Co., Ltd.
InventorJi-Ung Kim
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Abstract
The present disclosure relates a method of detecting an electrical disturbance by a DC component in a digital protective relay, which includes acquiring a sample value by sampling an input signal at a regular cycle, detecting the electrical disturbance based on a difference between a sampled first sample value and a second sample value after the first sample value, and when the electrical disturbance is detected, detecting the DC component based on a difference between the second sample value and a third sample value after the second sample value and a difference between the third sample value and a fourth sample value after the third sample value.
Claims7
A method of detecting an electrical disturbance by a DC component in a digital protective relay, the method comprising
- acquiring a sample value by sampling an input signal at a regular cycle;
- detecting the electrical disturbance based on a difference between a sampled first sample value and a second sample value after the first sample value;
- detecting the DC component based on a difference between the second sample value and a third sample value after the second sample value and a difference between the third sample value and a fourth sample value after the third sample value, when the electrical disturbance is detected, and
- controlling the digital protective relay not to perform a breaking operation, when the electrical disturbance is detected.
Dependencies are inferred from the claim text.