SYSTEM AND METHOD FOR MONITORING VIBRATION OF POWER TRANSFORMER
First Claim
1. A system for monitoring the vibration of a power transformer comprising:
- at least one vibration sensor operably mounted to the outer case of a transformer for sensing vibration of the power transformer;
a spectrum analyzer for processing the vibration signal from the vibration sensor, the spectrum analyzer generating a frequency spectrum of the vibration signal and calculating a velocity rating from the frequency spectrum;
a diagnosing means for evaluating the velocity rating of the vibration signal, the diagnosing means assigning a vibration grade for each velocity rating, the diagnosing means finding the maximum velocity rating; and
a means for dispatching a control message to an operator when the maximum velocity rating reaches a threshold value.
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Abstract
The present invention provides a system and method for monitoring vibration of a power transformer. The system comprises at least one vibration sensor operably mounted to the outer case of a transformer for sensing vibration of the power transformer; a spectrum analyzer for processing the vibration signal from the vibration sensor, the spectrum analyzer generating a frequency spectrum of the vibration signal and calculating a velocity rating from the frequency spectrum; a diagnosing means for evaluating the velocity rating of the vibration signal, the diagnosing means assigning a vibration grade for each velocity rating, the diagnosing means finding the maximum velocity rating; and a means for dispatching a control message to an operator when the maximum velocity rating reaches a threshold value. It can be appreciated that the mechanical health of a large-sized transformer can be managed in a systematic and efficient manner during its operation. This system can prevent accidents due to the mechanical failure of the transformer or diagnosing failure of the transformer itself during its operation. This system also can provide useful information to determine when the transformer has to be replaced and further to predict what the expected lifespan of the transformer will be.
22 Citations
19 Claims
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1. A system for monitoring the vibration of a power transformer comprising:
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at least one vibration sensor operably mounted to the outer case of a transformer for sensing vibration of the power transformer; a spectrum analyzer for processing the vibration signal from the vibration sensor, the spectrum analyzer generating a frequency spectrum of the vibration signal and calculating a velocity rating from the frequency spectrum; a diagnosing means for evaluating the velocity rating of the vibration signal, the diagnosing means assigning a vibration grade for each velocity rating, the diagnosing means finding the maximum velocity rating; and a means for dispatching a control message to an operator when the maximum velocity rating reaches a threshold value. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method for monitoring the vibration of a power transformer, comprising the steps of:
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obtaining vibration signal from a vibration sensor mounted to the outer case of the transformer; analyzing the vibration signal transmitted from vibration sensor using a fast Fourier transform; evaluating the analyzed vibration signal to decide the mechanical health of the transformer; and dispatching a control message to an operator when the evaluated vibration signal reaches a threshold value. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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Specification