DEVICE AND METHOD FOR ASSESSING THE DEGRADATION OF THE INSULATION OF AN OIL-INSULATED TRANSFORMER

摘要

A device (1) for assessing the corrosion of the transformer windings in an oil-insulated transformer comprising a copper conductor (2) immersed in the oil. The change of the resistance of the copper conductor (2) over time is measured, e.g. using a Wheatstone bridge (2, 12a, 12b, 12c), and used to assess the degradation of the copper exposed to the insulation oil. The temperature of the copper conductor can be controlled by an heating element and a temperature sensor.

主权项

1. A method for assessing the degradation of the insulation of an oil-insulated transformer due to the corrosion of the transformer windings, characterized in that it comprises the following steps:
preparing a structure (18) comprising a copper active element (2) defining a conductive path (3); coupling the structure (18) to the transformer in such a way that the active element (2) is in contact with the oil; keeping the active element (2) immersed in the oil at least for a predetermined interval of time between a starting instant and a final instant; measuring a value representing the resistance of the active element (2) at the final instant; comparing the value measured at the final instant with a value representing the resistance of the active element (2) at the initial instant in order to obtain an indication of the degradation.