DEVICE AND METHOD FOR ASSESSING THE DEGRADATION OF THE INSULATION OF AN OIL-INSULATED TRANSFORMER
First Claim
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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.
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Abstract
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.
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Citations
16 Claims
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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:
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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. - View Dependent Claims (2, 3, 4)
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5. A device (1) 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:
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a structure (18) having a first portion (5) and a second portion (4), the structure (18) being configured to be attachable to the transformer in such a way that the first portion (5) is outside the transformer and the second portion (4) is inside the transformer and in contact with the oil; an active element (2) made of copper, defining a conductive path (3) and connected to the second portion (4) to be operatively in contact with the oil; electrical contacts (17) electrically connected to the element (2) at the terminals of the conductive path (3) to allow reading of a value representing the resistance of the element (2) when the structure (18) is attached to the transformer. - View Dependent Claims (6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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Specification