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Development on On-Line Insulation Monitor of Capacitive Equipment Based on DSP Chip

Author: LiuShuWei
Tutor: KangZhongJian
School: China University of Petroleum
Course: Detection Technology and Automation
Keywords: Capacitive device Dielectric loss factor Online monitoring Improved harmonic analysis Fault Diagnosis
CLC: TM855
Type: Master's thesis
Year: 2009
Downloads: 204
Quote: 8
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Abstract


With the development of the power system to the direction of ultra-high pressure , high-capacity , running in order to ensure the security and stability of the high voltage electrical equipment , equipment insulation condition monitoring is particularly important. The insulation monitoring real-time monitoring in the operating voltage of the equipment insulation condition new technology to make up for the lack of poor real-time preventive tests . A large proportion of capacitive equipment in power plants, substations , and dielectric loss factor tan is an important parameter to reflect the capacitive equipment insulation condition , and on-line monitoring of the dielectric loss tanδ of great significance . In this paper, dielectric loss tan measuring stability is not high , the problem of insufficient accuracy , developed a line insulation monitoring device DSP-based capacitive devices . Shortcomings of harmonic analysis , the the improved harmonic analysis calculated dielectric loss tan delta . On windows and interpolated to the phase angle measurement error correction frequency fluctuations ; Hilbert transform structural analysis transform , and then filter out the negative frequency components of the signal ; window function design FIR digital low-pass filter filter the interference signal. Since the the traditional relatively insulated diagnosis result is not satisfactory , the fuzzy diagnosis method of diagnostic analysis of the capacitive device insulation . Take into account environmental factors as well as device circuit itself may introduce interference , TMS320F2812 DSP data processing, the core logic control , design the hardware circuit , including the power supply, signal conditioning , external expansion RAM . Software , based on a modular program development thinking , the data sampling , analytical filter , FIR digital low-pass filter , full wave Fourier algorithm , the window function correction frequency fluctuations in insulating diagnostic algorithm . Finally, developed by experimental verification device useful , reliable on-line monitoring of dielectric loss tanδ . Theoretical value of the dielectric loss with the basic algorithm to calculate the value of the improved harmonic analysis method compared to the value analysis of two dielectric loss performance of the calculation method , the different experimental models measured dielectric loss tanδ online monitoring . The experimental results show that the device is capable of accurate and stable dielectric loss tanδ line monitoring .

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CLC: > Industrial Technology > Electrotechnical > High Voltage Engineering > High - voltage insulation technology > Insulation test and inspection
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