Continuous condition monitoring of transformers
First Claim
1. A method for monitoring the condition of an electrical power transformer, the method comprising:
- a) measuring current and voltage data at terminals of the transformer, wherein the current and voltage data comprise both current and voltage data measured at terminals on a high voltage side of the transformer and current and voltage data measured at terminals on a low-voltage side of the transformer;
b) computing from the measured current and voltage data corresponding transformer impedance data;
c) repeating (a) and (b) continuously in real time to provide a temporal sequence of real-time transformer impedance data comprising the computed transformer impedance data; and
d) calculating from the temporal sequence of real-time transformer impedance data a moving average of transformer impedance; and
e) generating an alarm signal if recent transformer impedance values in the temporal sequence depart from the calculated moving average by a predetermined amount.
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Abstract
A device and method for monitoring the condition of an electrical power transformer in an electrical power grid synchronously measures current and voltage data at both a high voltage side of the transformer and a low-voltage side of the transformer and computes from this measured data corresponding transformer impedance data. These measurements and computations are repeated continuously in real time at a rates up to 30 Hz to provide a sequence of real-time transformer impedance data. An alarm signal is generated if a mean of the sequence of real-time transformer impedance data changes significantly.
30 Citations
15 Claims
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1. A method for monitoring the condition of an electrical power transformer, the method comprising:
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a) measuring current and voltage data at terminals of the transformer, wherein the current and voltage data comprise both current and voltage data measured at terminals on a high voltage side of the transformer and current and voltage data measured at terminals on a low-voltage side of the transformer; b) computing from the measured current and voltage data corresponding transformer impedance data; c) repeating (a) and (b) continuously in real time to provide a temporal sequence of real-time transformer impedance data comprising the computed transformer impedance data; and d) calculating from the temporal sequence of real-time transformer impedance data a moving average of transformer impedance; and e) generating an alarm signal if recent transformer impedance values in the temporal sequence depart from the calculated moving average by a predetermined amount. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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Specification