Partial discharge was the main cause and an important characteristic of insulation deterioration. At present, GIS partial discharge measurement means were single, the partial discharge characterization data obtained was not comprehensive, and the electrical and optical joint sensing information in the development process of GIS basin insulator discharge was lacking, resulting in misdiagnosis of insulation fault and high missed diagnosis rate. In this article, photoelectric joint measurement system for GIS basin insulator typical discharge defects was designed, which consisted of a power frequency pressurization system, a basin insulator sample model, a partial discharge electrical measurement system and a partial discharge optical measurement system. And the system could carry out the partial discharge test of the true basin insulator, completely measured the optical and electrical signals in the whole process of the development of typical discharge defects. Besides, it also could verify the consistency and feasibility of the photoelectric joint detection results by analyzing the phase distribution characteristics of each spectrum. Photoelectric joint detection provided data for the assessment of the severity of typical partial discharge defects, and the division of development process.
KEYWORDS: Transformers, Sensing systems, Control systems, Systems modeling, Control systems design, Sensors, Matrices, Detector arrays, Design and modelling, Feature extraction
In order to avoid the independent on-line monitoring devices of transformers and the lack of unified data interfaces for various sensing devices, a broadband current array sensing system is proposed. The system includes high frequency current, core grounding current, power frequency current, over-voltage current and other sensing networks. The system is a causal linear time invariant system, based on stable control principle, the improved adaptive fault estimation algorithm is proposed, and system stability is calculated based on the system dynamics model and transfer function.
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