Self-calibrating voltage sensor
First Claim
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1. A method for detecting when a monitored AC voltage falls outside of an acceptable range comprising:
- i) calculating an average peak voltage value based on measured peak voltage values of the monitored AC voltage, wherein the average peak voltage value is calculated by accumulating a sum of a predetermined number of measured peak voltage values, subtracting a previously calculated average peak voltage value from the sum, adding a present measured peak voltage value to the sum, and dividing the sum by the predetermined number;
ii) calculating the acceptable range based on the average peak voltage value; and
iii) generating a voltage-out-of-range signal if the monitored AC voltage exceeds the acceptable range.
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Abstract
A voltage sensor consists of a number of capacitive voltage sensors coupled to test points in an electrical power system. The outputs of the voltage sensors are digitized and processed by a digital processor, which determines a normal value for the monitored AC voltages, and then determines if the monitored AC voltages are acceptable based on variations from the normal value.
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17 Claims
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1. A method for detecting when a monitored AC voltage falls outside of an acceptable range comprising:
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i) calculating an average peak voltage value based on measured peak voltage values of the monitored AC voltage, wherein the average peak voltage value is calculated by accumulating a sum of a predetermined number of measured peak voltage values, subtracting a previously calculated average peak voltage value from the sum, adding a present measured peak voltage value to the sum, and dividing the sum by the predetermined number; ii) calculating the acceptable range based on the average peak voltage value; and iii) generating a voltage-out-of-range signal if the monitored AC voltage exceeds the acceptable range. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A system for detecting when a monitored AC voltage falls outside of an acceptable range comprising:
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i) at least one voltage acquisition circuit, the voltage acquisition circuit generating a digital signal representative of the monitored AC voltage; ii) a processor coupled to the voltage acquisition circuit for executing a voltage monitoring algorithm and for generating a voltage out-of-range signal when the monitored AC voltage falls outside of the acceptable range, wherein the processor (a) calculates an average peak voltage value based on measured peak voltage values of the monitored AC voltage wherein the average peak voltage value is calculated by accumulating a sum of a predetermined number of measured peak voltage values, subtracting a previously calculated average peak voltage value from the sum, adding a present measured peak voltage value to the sum, and dividing the sum by the predetermined number; (b) calculates the acceptable range based on the average peak voltage value, and (c) generates a voltage-out-of-range signal if the monitored AC voltage exceeds the acceptable range. - View Dependent Claims (13, 14, 15, 16, 17)
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Specification