1、 局放在线监测 Partial Discharge Measurement using DMS Portable UHF MonitorUHF技术实现在线监测，适合周期性连续监测实现在线监测，适合周期性连续监测简单科学发现简单科学发现GIS的缺陷的缺陷早期发现，及时处理早期发现，及时处理适合适合110-800kVGIS内置探头，受干扰小内置探头，受干扰小系统自动分析处理数据系统自动分析处理数据在线监测的优点 投运前及时发现制造安装等缺陷 及时准确发现设备运行时的缺陷 对设备潜在缺陷提供预警性报警 对设备安全运行提供准确的信息 对发展性故障提供预见性资料 节省设备不必要的维护费用1-导体的突出部
2、分 2-外壳的突出部分3-悬浮电位4-带电导体与绝缘体间的游离体5-屏蔽带及绝缘体间的空隙6-绝缘体的空穴/电树 GIS局放的原因局放监测的原理 -在GIS气室中耦合的电磁能 -在气室中电离的迅速膨胀所 产生声波 不同的局放测量技术的灵敏度的比较Sensitivity to loose particles Sensitivity to needle on a barrier 不同的局放测量技术的灵敏度的比较缺陷是诱发局放的根源 局放是上升时间非常快的电流脉冲信号 0 2 4 6 8 10 ns024脉冲电流,mAPD 脉冲从存在的缺陷发出的电流脉冲信号UHF 信号UHF 原理缺陷是诱发局放的根
3、源局放是上升时间非常快的电流脉冲信电流脉冲信号在GIS中传播 UHF在GIS壳体共振 UHF 信号(频率范围)01500 750频率,MHz幅值UHF 内置探头windowcouplerinternalcouplerbarriercouplerTypes of UHF coupler内置探头的精度Window coupler sensitivity系统Radial PDMsensorPDM Equipment CabinetOCUPDM 系统数据显示Properties window 0 360amplitude 0-100%cycle number(1 sec total data)50 0
4、10203040phase positionon HV sinusoiddischarge pulses areplotted at the phaseposition where theyoccurred 180UHF PD Monitor Display测试信号显示Peak hold 模式显示PRPD 格式显示游离的金属颗粒several discharges/cycleone discharge/10-15 cyclesincreasing voltage timeReference powercycle20msec64 time bucketsPeak detected signalr
5、esetDetected pulsePeak detected level312 microsecData recording自由的金属颗粒母线电晕 故障开始 恶性发展 导致 故障随电压升高 电晕电晕PRPDA记录格式悬浮电位特征三维图悬浮电位三维俯视图悬浮电位PRPDA 格式显示局放典型的三维显示分析图形自由的金属颗粒悬浮电位内部电晕局放信号二维特征图螺栓松动局放信号图故障点24小时记录24 hr History record for void in bushing100 day History record for void in bushing自动处理系统数据比较 特征信号与数据库信息比
6、较，并作出判断.数据显示为 2D/3D or PRPD 格式 数据分析来源:1.庞大的 ANN 数据库2.统计分析3.走向分析4.(任务分析)局放信号干扰信号颗粒母线电晕气室电晕悬浮电位空穴不知道的移动电话雷达马达干扰不明确/不充足的数据不明确的信号灯步骤 1步骤 22D+3D 局放数据 人工智能数据库电晕 PD 由母线电晕放电引起悬浮电位 PD 由悬浮的部件引起 颗粒 PD 由自由颗粒引起雷达噪音 噪音由飞行器雷达引起空穴 PD 由绝缘件针孔引起灯光噪音 噪音由荧光灯引起手机噪音 噪音由移动电话引起马达噪音 噪音由气泵和其他电动驱动设备引起带分析的事件窗口报警属性窗口数据摘要窗口PD 报警摘
7、要局放在线设备对GIS提出更高的要求 设计的要求更高 原材料要求更高 零部件加工制造要求高 部件分装要求高 现场安装要求高 工程过程控制要求高在线监测准确诊断故障点的位置直通管内缺陷捕捉d=(D-0.3t)/2 metrest=timedifference(ns)PD sourceD(m)d(m)Matched 2 channel amplifier High speed oscilloscope UHF cable UHF cable PD sensor PD sensor Matched 2 channel amplifier UHF cable UHF cable PD sensor P
8、D sensor High speed oscilloscope 9 metres=30 ns Matched 2 channel amplifier UHF cable UHF cable PD sensor PD sensor Time=0 ns High speed oscilloscope Matched 2 channel amplifier UHF cable UHF cable PD sensor PD sensor Time=3 ns High speed oscilloscope Matched 2 channel amplifier UHF cable UHF cable
9、PD sensor PD sensor Time=6 ns High speed oscilloscope Matched 2 channel amplifier UHF cable UHF cable PD sensor PD sensor Time=9 ns High speed oscilloscope Matched 2 channel amplifier UHF cable UHF cable PD sensor PD sensor Time=12 ns High speed oscilloscope Matched 2 channel amplifier UHF cable UHF
10、 cable PD sensor PD sensor Time=15 ns High speed oscilloscope Matched 2 channel amplifier UHF cable UHF cable PD sensor PD sensor Time=18 ns High speed oscilloscope Matched 2 channel amplifier UHF cable UHF cable PD sensor PD sensor Time=21 ns High speed oscilloscope Matched 2 channel amplifier UHF
11、cable UHF cable PD sensor PD sensor High speed oscilloscope Time=24 ns Matched 2 channel amplifier UHF cable UHF cable PD sensor PD sensor Time=27 ns Time diff=0 ns High speed oscilloscope Time difference=0 nsd=(D-0.3t)/2where D is the distance between couplers(following path of the busbar)t is the
12、time difference in nanosecondsd is the distance from the first couplerThis gives a value of:d=4.5m Matched 2 channel amplifier UHF cable UHF cable PD sensor PD sensor High speed oscilloscope 9 metres=30 ns 3 metres Matched 2 channel amplifier UHF cable UHF cable PD sensor PD sensor High speed oscill
13、oscope Time=0 ns Matched 2 channel amplifier UHF cable UHF cable PD sensor PD sensor High speed oscilloscope Time=3 ns Matched 2 channel amplifier UHF cable UHF cable PD sensor PD sensor High speed oscilloscope Time=6 ns Matched 2 channel amplifier UHF cable UHF cable PD sensor PD sensor High speed
14、oscilloscope Time=10 ns Matched 2 channel amplifier UHF cable UHF cable PD sensor PD sensor High speed oscilloscope Time=13 ns Matched 2 channel amplifier UHF cable UHF cable PD sensor PD sensor High speed oscilloscope Time=16 ns Matched 2 channel amplifier UHF cable UHF cable PD sensor PD sensor Hi
15、gh speed oscilloscope Time=20 ns Matched 2 channel amplifier UHF cable UHF cable PD sensor PD sensor High speed oscilloscope Time=22 ns Matched 2 channel amplifier UHF cable UHF cable PD sensor PD sensor High speed oscilloscope Time=27 ns Matched 2 channel amplifier UHF cable UHF cable PD sensor PD
16、sensor High speed oscilloscope Time=32 ns Time difference=10ns Time difference=10 nsd=(D-0.3t)/2where D is the distance between couplers(following path of the busbar)t is the time difference in nanosecondsd is the distance from the first couplerThis gives a value of:d=3m (from red/first coupler)缺陷在内
17、置探头之外 Matched 2 channel amplifier UHF cable UHF cable PD sensor PD sensor High speed oscilloscope Time=-6 ns Matched 2 channel amplifier UHF cable UHF cable PD sensor PD sensor High speed oscilloscope Time=0 ns Matched 2 channel amplifier UHF cable UHF cable PD sensor PD sensor High speed oscillosco
18、pe Time=6 ns Matched 2 channel amplifier UHF cable UHF cable PD sensor PD sensor High speed oscilloscope Time=12 ns Matched 2 channel amplifier UHF cable UHF cable PD sensor PD sensor High speed oscilloscope Time=18 ns Matched 2 channel amplifier UHF cable UHF cable PD sensor PD sensor High speed os
19、cilloscope Time=24 ns Matched 2 channel amplifier UHF cable UHF cable PD sensor PD sensor High speed oscilloscope Time=30 ns Matched 2 channel amplifier UHF cable UHF cable PD sensor PD sensor High speed oscilloscope Time=36 ns Matched 2 channel amplifier UHF cable UHF cable PD sensor PD sensor High speed oscilloscope Time=42 ns Time difference=30 ns 结论 测量的数值计算得出结果，判断设备缺陷位置在探头以外缺陷在T型接口处的捕捉 PD sensor PD sensor PD sensor PD sensor PD sensor PD sensor PD sensor PD sensor PD sensor PD sensor 结论 测量的数值计算出结果，设备缺陷的位置来自T型接口
