变压器声纹/振动在线监测装置
变压器本身的声纹振动是由制冷系统的振动以及变压器本体(铁芯和绕组等的统称)的振动产生。电(dian)(dian)力变(bian)(bian)(bian)压(ya)(ya)器(qi)表(biao)面的(de)(de)声纹(wen)振(zhen)动(dong)(dong)(dong)(dong)与变(bian)(bian)(bian)压(ya)(ya)器(qi)绕(rao)组(zu)(zu)及(ji)铁(tie)芯的(de)(de)压(ya)(ya)紧(jin)状(zhuang)况(kuang)、绕(rao)组(zu)(zu)的(de)(de)位(wei)移及(ji)变(bian)(bian)(bian)形等(deng)状(zhuang)况(kuang)密(mi) 切(qie)相(xiang)关,根据(ju)变(bian)(bian)(bian)压(ya)(ya)器(qi)自身各(ge)处测取声纹(wen)振(zhen)动(dong)(dong)(dong)(dong)信(xin)(xin)号(hao)改变(bian)(bian)(bian)的(de)(de)程度可判断(duan)出变(bian)(bian)(bian)压(ya)(ya)器(qi)绕(rao)组(zu)(zu)或(huo)铁(tie)芯是否有缺陷, 在线监测电(dian)(dian)力变(bian)(bian)(bian)压(ya)(ya)器(qi)的(de)(de)声纹(wen)振(zhen)动(dong)(dong)(dong)(dong)异(yi)常(chang)可实现(xian)变(bian)(bian)(bian)压(ya)(ya)器(qi)缺陷的(de)(de)检测和定位(wei)。在短路(lu)状(zhuang)况(kuang)下变(bian)(bian)(bian)压(ya)(ya)器(qi)自身振(zhen)动(dong)(dong)(dong)(dong)主要是由绕(rao)组(zu)(zu)振(zhen)动(dong)(dong)(dong)(dong)引起(qi)的(de)(de),可以利(li)用(yong)发生短路(lu)事故时的(de)(de)变(bian)(bian)(bian)压(ya)(ya)器(qi)自身声纹(wen)振(zhen)动(dong)(dong)(dong)(dong)信(xin)(xin)号(hao),来监测绕(rao)组(zu)(zu)是否发生了变(bian)(bian)(bian)形或(huo)松动(dong)(dong)(dong)(dong)。
变(bian)压器声纹振动在线(xian)监测(ce)系统最多可同时监测(ce)6路声纹振动信(xin)号,其系统框(kuang)图如下图所(suo)示:
变压器声纹/振动在线监测装置主要由(you)压电式声(sheng)纹传感器、信号调理、触发(fa)模块、同步采样 A/D 转(zhuan)换器、主控模块组成。
压电(dian)(dian)式声纹(wen)振(zhen)(zhen)(zhen)动传(chuan)感(gan)(gan)器(qi)主(zhu)要把变(bian)压器(qi)外壳上的(de)(de)(de)声纹(wen)振(zhen)(zhen)(zhen)动信号(hao)(hao)转变(bian)成(cheng)(cheng)电(dian)(dian)信号(hao)(hao);信号(hao)(hao)调理模(mo)块为振(zhen)(zhen)(zhen)动传(chuan)感(gan)(gan)器(qi)提供恒(heng)定(ding)电(dian)(dian)流(liu),使传(chuan)感(gan)(gan)器(qi)正常工作,同时隔离传(chuan)感(gan)(gan)器(qi)输出信号(hao)(hao)中(zhong)(zhong)的(de)(de)(de)直流(liu)分(fen)(fen)量;触发(fa)模(mo)块根据实际(ji)情况动态(tai)设定(ding)振(zhen)(zhen)(zhen)动信号(hao)(hao)采集的(de)(de)(de)阀(fa)值;多通道同步 A/D 转换(huan)器(qi)完成(cheng)(cheng) IED 中(zhong)(zhong)各通道振(zhen)(zhen)(zhen)动信号(hao)(hao)的(de)(de)(de)同步数字转换(huan);主(zhu)控(kong)模(mo)块完成(cheng)(cheng)整(zheng)个(ge)系统的(de)(de)(de)数据采集、存(cun)储、分(fen)(fen)析,并将分(fen)(fen)析结果以(yi) IEC61850 标准格式送(song)出;光纤/以(yi)太网接(jie)(jie)口(kou)为标准通讯接(jie)(jie)口(kou),完成(cheng)(cheng)振(zhen)(zhen)(zhen)动监测 IED 与其他系统的(de)(de)(de)通讯连接(jie)(jie)。
l 灵敏度(@250 Hz):11.2mV/Pa (-39 dB re 1V/Pa)
l 频率响应:20 Hz ~ 10 kHz
10 kHz ~ 20 kHz
l 动态范围:29 dBA ~ 140 dB
l 安(an)装方式:永(yong)磁体吸附(fu)安(an)装或(huo)者胶粘安(an)装或(huo)支架安(an)装
l 供电:220V AC
l 外型尺寸:1U机箱
l 具备相(xiang)关故(gu)障(zhang)和缺陷的(de)特征指纹(wen)以及指纹(wen)分析技术(shu)
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