High-voltage bushing and method for monitoring its operation
A high-voltage bushing has an insulator, which contains an insulating gas and an insulating solid, and an inner conductor which is led through the insulator. A mounting flange is employed for the mounting of the high-voltage bushing on a wall. A sensor, which is arranged on the mounting flange and is configured for the detection of at least one reaction product of the insulating gas and/or of the insulating solid. A corresponding method monitors an operating state of the high-voltage bushing.
1. A high-voltage bushing, comprising:
an insulator having an insulating gas and an insulating solid;
an inner conductor being led through said insulator;
a mounting flange; and
a sensor disposed on said mounting flange and configured for a detection of at least one reaction product of said insulating gas and/or of said insulating solid, wherein said at least one reaction product consists of at least one gas selected from the group consisting of: SO 2 , H 2 , CH 4 , CO and CO 2 .
2. The high-voltage bushing according to claim 1 , wherein said insulator has a resin-impregnated active part and a secondary insulation containing the insulating gas.
3. The high-voltage bushing according to claim 1 , wherein said insulating gas is SF 6 .
4. The high-voltage bushing according to claim 1 , wherein the high-voltage bushing is a DC voltage bushing for an insulation of a DC voltage.
5. A method for monitoring an operating state of a high-voltage bushing having an insulator with an insulating gas and an insulating solid, an inner conductor which is led through the insulator, a mounting flange, and a sensor, which comprises the steps of:
detecting, by means of the sensor being disposed on the mounting flange, at least one reaction product of the insulating gas and/or of the insulating solid, wherein, for a detection of the reaction product, extracting a gas sample from a gas compartment of the insulator and feeding the gas sample to the sensor; and
generating and evaluating a measuring signal.
6. The method according to claim 5 , wherein the gas sample is repeatedly extracted at time intervals of at least 24 hours.
7. The method according to claim 5 , wherein the evaluating step includes a comparison with predefined reference data.
8. The method according to claim 5 , wherein the evaluating step includes a detection of a partial discharge in the high-voltage bushing.