Method and device for estimating the clamping force on a winding package of a transformer or a reactor

摘要

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.

主权项

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, 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.