共查询到19条相似文献,搜索用时 187 毫秒
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变压器套管末屏对现场局部放电测量影响的实例与分析 总被引:1,自引:3,他引:1
介绍了使用变频电源进行现场局部放电测量的基本方法,总结了现场试验中的干扰类型及排除措施,结合2次现场测量实例,介绍了干扰排除过程及思路,分析了套管末屏接地不良对现场局部放电测量的影响,总结了此类影响的特点及处理方法。该方法对变压器现场试验、保证电力设备安全稳定运行具有一定的借鉴意义 相似文献
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气体绝缘组合电器绝缘现场试验 总被引:2,自引:0,他引:2
阐述了进行气体绝缘组合电器(GIS)现场交流耐压试验的基本方法,并对局部放电检测诊断内部绝缘的方法进行了讨论。综合分析GIS现场绝缘试验的有效性和存在问题,指出交流耐压试验配合灵敏的局部放电测量是有效的现场试验方法。选择可行的局部放电在线监测系统,还可以实现实时掌握绝缘运行状态。 相似文献
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长时感应电压(ACLD)带局部放电测量试验是检测变压器内部是否存在缺陷的最有效手段之一。笔者以±800 kV特高压直流工程中Y-Δ换流变压器局部放电测量试验为对象,研究并成功实施了现场直接采用阀侧对称加压方式进行的ACLD带局部放电测量试验。详细介绍了该试验的试验原理及方法、试验参数的计算和现场实施情况,并对试验回路中采取的抗干扰措施进行了总结。试验结果验证了特高压换流变现场阀侧对称加压局部放电试验的可行性及有效性。 相似文献
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250Hz发电机-变压器组是现场局部放电测量较为理想的试验电源。本文就大型电力变压器进行现场局部放电测量时出现的问题作了较为全面的讨论,并给出了相应解决方法,同时也讨论了由于250Hz电源所引起的一些新问题及其解决方法。 相似文献
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750 kV变压器现场工频感应耐压和局部放电试验 总被引:4,自引:0,他引:4
介绍了我国750 kV输变电示范工程中变压器现场局放交接试验的标准、程序和过程,分析了局放起始电压和熄灭电压定义中的含混之处,比较了750 kV变压器的工频耐压值和局放试验电压值、分析了局放试验中经常出现的问题。提出如下建议:①提高750 kV变压器的工频绝缘水平;②放宽变压器局放现场交接试验标准至1 000 pC;③重新定义局部放电起始电压和熄灭电压;④加强现场实用技术的研究;⑤试验人员持证上岗;⑥试验仪器定期校验;⑦必要时采用在线监测。这些建议不限于750 kV变压器,也可为 1 000 kV变压器的现场局放交接试验参考。 相似文献
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研究干扰识别和定位技术是解决换流变压器现场局部放电测量难题的关键。针对南方电网开展的国内外首次现场修复±800 k V换流变压器的试验要求,采用特高频(UHF)法对局部放电测量干扰进行了旁路监测,通过分析UHF检波信号的波形特征和相位分布统计特征验证了现场检修试验厂房对换流站电磁辐射的屏蔽效果,通过UHF天线阵列精确定位并妥善处理了厂房内的多种局部放电干扰源,支撑被试的±800 k V换流变压器顺利通过了各项试验,视在放电量满足了出厂试验的限值要求。为今后研究在无厂房条件甚至运行条件下实现换流变压器局部放电水平的精确评价提供了技术基础。 相似文献
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Digital partial discharge (PD) diagnosis has become a state of the art, but computer aided procedures based on pattern recognition principles are negatively effected by on-site disturbances. The benefits and limits of expert diagnosis compared to machine intelligent systems are discussed. It is pointed out that a sufficient noise resistivity and test voltage independency of the diagnosis concept is a must for a successful on-site PD defect identification and evaluation. Experimental results are presented, taken into account especially novel evaluation procedures, which are more independent from the applied PD sensors. It is shown that PD defect identification on site at operating voltages and respectively disturbed data is still a challenge. A method of resolution with an intelligent noise resistant diagnosis concept is discussed. A hierarchical and redundant approach is presented, which improves the on site PD source identification as well as on-site risk assessment. 相似文献
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Gulski E. Wester F.J. Smit J.J. Seitz P.N. Turner M. 《Electrical Insulation Magazine, IEEE》2000,16(2):17-25
To obtain a sensitive picture of discharging faults in power cables the PD should be ignited, detected, and located at power frequencies that are comparable to operating conditions at 50 or 60 Hz. In this way, realistic magnitudes in [pC] and reproducible patterns of discharges in a power cable can be obtained. PD measurements during service as well as on-site continuous energizing at 50 (60) Hz of MV cables are not always economically realistic for on-site inspections. Different energizing methods have been introduced and employed during recent years. Therefore, based on the assumption that sensitive detection of critical PD sites occurs by a method mostly similar to 50 Hz energizing conditions, a method as introduced for on-site PD diagnosis of MV cables is discussed: oscillating wave test system (OWTS) 相似文献
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GIS现场试验的现状与发展 总被引:4,自引:1,他引:3
本文介绍GIS现场试验的现状与经验 ,根据世界范围的经验 ,指出交流电压试验配合灵敏的局放测量是最好的试验方法。讨论了传统的局放测量方法和其它诊断方法的有效性和存在的问题 ,指出如果局放测量的灵敏度足够 ,则交流电压试验配合局放测量将成为唯一的现场试验方法 相似文献
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Heizmann Th. Aschwanden Th. Hahn H. Laurent M. Ritter L. 《Power Delivery, IEEE Transactions on》1998,13(2):330-335
A total number of 15 premoulded joints of three 170 kV cable circuits (XLPE and EPR) were equipped with partial discharge (PD) sensors. The developed sensors are based on inductive high frequency coupling of partial discharge pulses occurring in the joints. The PD activity of each joint was monitored during an after laying AC acceptance test. The test voltage of 190 kV was generated by means of a frequency-tuned series-resonance test set. The signals of the PD sensors were assessed with a spectrum analyser in a frequency range from 15 to 50 MHz, allowing a good separation of noise from PD signals under high interference levels. The investigation demonstrated the feasibility of on-site PD measurements on joints during after laying tests 相似文献