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US 6,617,839 B2Granted
Method for detecting current transformer saturation
AssigneesYong-Cheol Kang, Sang-Hee Kang
InventorsYong-Cheol Kang, Sang-Hee Kang, Seung-Hun Ok
Life of this patent
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Abstract
Disclosed is a method for detecting saturation of a current transformer. The method determines whether or not a change of a secondary current generated in a current transformer is due to the saturation of the current transformer.
Claims6
A method for determining saturation of a current transformer comprising the steps of:
- deciding a decision function which utilizes a secondary current value of the current transformer, wherein the decision function is preferably one of a second-order difference, an adjusted second-order difference, an energy function of the second-order difference and an energy function of the adjusted second-order difference;
- deciding the decision function value at each point of time by measuring the secondary current value at predetermined time intervals;
- determining whether the decision function value is greater than a threshold value at each point of time;
- and
- when the decision function value is determined to be greater than the predetermined threshold value, determining the beginning or end of the saturation, wherein the saturation of the current transformer is determined to end if the saturation of the current transformer begins before the point that the decision function value is greater than the predetermined threshold value, and the saturation of the current transformer is determined to begin, if the current transformer saturation ends or does not begin before the point where the decision function value is greater than the predetermined threshold value.
2 more elements
A method for determining saturation of a current transformer comprising the steps of:
- deciding a decision function which utilizes a secondary current value of the current transformer, wherein the decision function is preferably one of a third-order difference, an adjusted third-order difference, an energy function of the third-order difference and an energy function of the adjusted third-order difference;
- deciding the decision function value at each point of time by measuring the secondary current value at predetermined time intervals;
- deciding whether the decision function value is greater than a threshold value at each point of time;
- and
- when the decision function value is determined to be greater than the predetermined threshold value, determining the beginning or end of the saturation, wherein the saturation of the current transformer is determined to end if the saturation of the current transformer begins before the point that the decision function value is greater than the predetermined threshold value, and the saturation of the current transformer is determined to begin, if the current transformer saturation ends or does not begin before the point where the decision function value is greater than the predetermined threshold value.
2 more elements
A method for determining saturation of a current transformer comprising the steps of:
- deciding a decision function which utilizes a secondary current value of the current transformer, wherein the decision function is preferably one of a fourth-order difference, an adjusted fourth-order difference, an energy function of the fourth-order difference and an energy function of the adjusted fourth-order difference;
- deciding the decision function value at each point of time by measuring the secondary current value at predetermined time intervals;
- determining whether the decision function value is greater than a threshold value at each point of time;
- and
- when the decision function value is determined to be greater than the predetermined threshold value, determining the beginning or end of the saturation, wherein the saturation of the current transformer is determined to end if the saturation of the current transformer begins before the point that the decision function value is greater than the predetermined threshold value, and the saturation of the current transformer is determined to begin, if the current transformer saturation ends or does not begin before the point where the decision function value is greater than the predetermined threshold value.
2 more elements
Dependencies are inferred from the claim text.