Abstract
The paper designed a semicircle dipole inner sensor for UHF partial discharge detection in GIS. By comparing the symmetric semicircle dipole sensor and asymmetric semicircle dipole sensor characteristics, the symmetric semicircle dipole sensor’s coupling property is better than that of asymmetric semicircle dipole sensor. At the same time, by changing the symmetric semicircle dipole transducer radius, the position of the feeder pole , the height of the feeder pole, analyze its influence on sensor features.
Highlights
Uhf inner sensor is a kind of uhf antenna which used to receive electromagnetic waves that produced by internal partial discharge of GIS
For antenna input impedance, standing wave ratio, gain are the important parameters, so these parameters for evaluating the performance of the inner sensor is of great significance
The signals which coupling to the partial discharge that can be converted into voltage signal output, as the power of the peripheral receiving circuit, based on thevenin theorem, the circuit can be equivalent to the ideal voltage source and the resistance in series, a simplified circuit resistance can be understood as the input impedance of receiving antenna looking from peripheral circuit terminal [11]
Summary
In the mid - 1960 - s, the birth of GIS, makes the high voltage power equipment qualitative leap. UHF is more effective for monitoring GIS partial discharge, with strong anti-interference ability, high sensitivity of monitoring [7,8,9]. For the GIS equipment has been put into operation, can install the external sensors, it is usually installed on the GIS basin insulator, through testing the leaked electromagnetic wave signal of the insulator to realize the partial discharge detection. The shortcoming of this method is the sensor works in the complex electromagnetic environment , vulnerable to the effects of electromagnetic radiation around. The inner sensor installed on GIS shell can obtain high detection sensitivity, and it has the characteristics of flexible installation, good safety
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