Method and device for estimating the clamping force on a winding package of a transformer or a reactor
First Claim
1. A method for estimating a clamping force on a winding package of a transformer or a reactor, the winding package comprising at least one winding with connections and an iron core, wherein the method comprises the steps of:
- supplying a current pulse to the connections of the winding in order to excite the winding in a vibration mode,measuring vibrations of the winding package generated by the current pulse,calculating a mechanical resonant frequency based on the measured vibrations, andestimating the clamping force on the winding package based on the calculated mechanical resonant frequency and a predetermined relation between expected mechanical resonant frequency and clamping force.
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Abstract
A method and a device for estimating the winding clamping force on a winding package of a transformer or a reactor, the winding package comprising at least one winding with connections and an iron core. The device includes a current pulse generator configured to generate a current pulse sufficient to excite the winding, means for supplying the current pulse to the winding, a sensor for measuring vibrations of the transformer or the reactor generated by the current pulse, and a computing unit configured to calculate a mechanical resonant frequency based on the measured vibrations and to estimate the clamping forces on the winding packages based on the calculated mechanical resonant frequency and a predetermined relation between the expected mechanical resonant frequency and the clamping force.
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Citations
13 Claims
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1. A method for estimating a clamping force on a winding package of a transformer or a reactor, the winding package comprising at least one winding with connections and an iron core, wherein the method comprises the steps of:
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supplying a current pulse to the connections of the winding in order to excite the winding in a vibration mode, measuring vibrations of the winding package generated by the current pulse, calculating a mechanical resonant frequency based on the measured vibrations, and estimating the clamping force on the winding package based on the calculated mechanical resonant frequency and a predetermined relation between expected mechanical resonant frequency and clamping force. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A device for determining a mechanical resonant frequency of a vibration mode for a winding package of a transformer or a reactor, the winding package comprising at least one winding with connections and an iron core, characterized in that the device comprises:
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a current pulse generator connected to the winding and configured to generate a current pulse sufficient to excite the winding, a sensor for measuring vibrations of the transformer or the reactor generated by the current pulse, and a computing unit configured to calculate said mechanical resonant frequency based on the measured vibrations and to estimate a clamping force on the winding package based on the calculated mechanical resonant frequency and a predetermined relation between expected mechanical resonant frequency and clamping force. - View Dependent Claims (8, 9, 10, 11, 12, 13)
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Specification