高壓開關(guān)柜在線監(jiān)測及斷路器行程信號(hào)的處理
張思宇，梅軍
東南大學(xué) 電氣工程學(xué)院, 江蘇 南京 210096
摘 要：提出了一種基于分布式結(jié)構(gòu)和以太網(wǎng)通信方式的高壓開關(guān)柜在線監(jiān)測系統(tǒng)，該系統(tǒng)采用高級(jí)RISC微處理器(ARM)與現(xiàn)場可編程門陣列(FPGA)構(gòu)成的嵌入式數(shù)據(jù)采集與通信單元。針對(duì)在線監(jiān)測系統(tǒng)采集到的斷路器行程信號(hào)，利用小波閾值消噪方法在消去噪聲的同時(shí)較好地保留了信號(hào)的特征，對(duì)于經(jīng)過去噪處理的離散行程信號(hào)，在Matlab軟件中對(duì)其求微分，得到斷路器動(dòng)觸頭速度的離散數(shù)據(jù)曲線，求得的速度最大點(diǎn)即為剛合點(diǎn)，進(jìn)而可得出斷路器的開距、超程等參數(shù)，通過數(shù)據(jù)對(duì)比驗(yàn)證了此方法的有效性和準(zhǔn)確性。
關(guān)鍵詞：高壓開關(guān)柜；在線監(jiān)測；行程信號(hào)；消噪
中圖分類號(hào)：TM561；TM591 文獻(xiàn)標(biāo)識(shí)碼：A 文章編號(hào)：1007-3175(2013)12-0041-04
High-Voltage Switchgear Online Monitoring and Processing of Circuit Breakers Displacement Signal
ZHANG Si-yu, MEI Jun
School of Electrical Engineering, Southeast University, Nanjing 210096, China
Abstract: This paper raised a kind of high-voltage switchgear online monitoring system based on distributed structure and Ethernet communication. The system adopted the advanced reduced instruction set computer (RISC) microprocessor (ARM) and field programmable gate array (FPGA) to constitute embedded data collecting and communication unit. In allusion to circuit breakers displacement signal of on-line monitoring system, wavelet threshold denoising method was used to remain characteristics of signals while denoising. The denoising dispersed displacement signals were differential in Matlab to obtain dispersed data curves of circuit breakers moving contacts speed. The maximum point of speed is the closing point, thus further to get open gap of circuit breakers, over distance etc parameters. Data comparison verifies the validity and correctness of the method.
Key words: high-voltage switchgear; on-line monitoring; displacement signal; de-noising
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