Digital protective relay
AssigneeLsis Co., Ltd.
InventorJiung Kim
Life of this patent
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Abstract
The present disclosure relates to provide an active erroneous sample elimination device or erroneous sample elimination method for a relay capable of correctly implementing erroneous sample elimination processing even during a plurality of electrical disturbances mixed with an electrical quantity detection signal, and a digital protective relay according to the present disclosure may include a converter that samples an analog signal and converts the sampled signal to a digital signal; and a processor that searches an inflection point at which an electrical variation quantity varies from an increase to a decrease or from a decrease to an increase based on the digital signal, and compares an electrical variation quantity prior to and subsequent to the inflection point with a preset electrical quantity.
Claims5
A digital protective relay, comprising:
- a converter configured to sample an analog signal and convert the sampled analog signal to a digital signal;
- and
- a processor configured to:
- search an inflection point at which an electrical variation quantity varies from an increase to a decrease or from a decrease to an increase based on the digital signal, wherein the electrical variation quantity comprises at least one of current variation amount or voltage variation amount;
- compare the electrical variation quantity prior to and subsequent to the inflection point with a preset electrical quantity;
- and
- substitute electrical quantity data at the inflection point with electrical quantity data prior to a predetermined period when the digital signal is determined as an electrical disturbance.
A noise elimination method for a digital relay, the method comprising:
- sampling an analog signal of an electrical quantity detection signal and converting the sampled analog signal to a digital signal;
- searching an inflection point at which an electrical variation quantity varies from an increase to a decrease or from a decrease to an increase based on the digital signal by a processor, wherein the electrical variation quantity comprises at least one of current variation amount or voltage variation amount;
- comparing the electrical variation quantity prior to and subsequent to the inflection point with a predetermined normal reference electrical variation quantity by the processor;
- and
- substituting an electrical quantity data at the inflection point with an electrical quantity data prior to a predetermined period by the processor when the digital signal is determined as an electrical disturbance where an electrical variation quantity prior to and subsequent to the inflection point is not less than a predetermined normal reference electrical variation quantity.
Dependencies are inferred from the claim text.