| Summary: | 碩士 === 國立臺灣科技大學 === 電機工程系 === 94 === For the sake of maintenance for the underground cable system, it is an essential to develop an on-line monitoring system. In addition to save the manpower cost, it can effectively manage the electric insulating system of cable, so as to improve security, reliability and quality of the power system. Because the common underground cable system accidents usually results from on-site cable accessories which are assembled by the personnel, this thesis selects distribution cable joint to develop the on-line monitoring system.
This thesis establishes a simple effective and reliable on-line PD monitoring system via DSP, instead of adopting the computer-based signal processing method structure. The implementation of on-line monitoring system structure can be divided into two parts: 1) hardware: measuring unit, monitoring unit, transmit unit and PC; 2) software: signal acquiring, filtering, characteristic value, trend analysis and insulating state estimating.
This thesis utilizes a defective cable joint as an experimental object. The experimental result shows that the proposed on-line monitoring system can exclude noise from measured PD signal and offer a variety analysis data for assessing the insulation status.
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