Mimic high pass filter in a protective relay
AssigneeGeneral Electric Company
InventorLouis Chi Hoi Cheng
Life of this patent
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Abstract
A mimic filter which can be implemented in analog or digital circuitry, and which removes dc offset or other noise from an input signal using a pseudo-differentiation technique. The input signal is adjusted by a feedback value, and the adjusted signal is amplified by a proportional gain factor to generate an output signal. The feedback value is determined by integrating the output signal and multiplying the integration by an integration gain factor. The mimic filter avoids the generation of false signal spikes.
Claims19
A method for filtering an electrical signal representative of a power system parameter, comprising the steps of:
- receiving an input electrical signal;
- adjusting the input electrical signal by a feedback value;
- amplifying the adjusted electrical signal by a proportional gain value;
- outputting the amplified signal as an output signal;
- and
- removing noise from the input electrical signal based on the output signal,
- wherein the feedback value is determined by integrating the output signal.
A filter for filtering an input signal representative of a power system, comprising:
- an input for receiving the input signal representative of the power system;
- means for adjusting the input signal by a feedback value;
- an amplifier for amplifying the adjusted input signal by a proportional gain value, and outputting the result as an output signal;
- and
- an integrator for integrating the output signal to generate the feedback value.
Dependencies are inferred from the claim text.