共查询到20条相似文献,搜索用时 78 毫秒
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某500 kV开闭站近几年来串补保护的核心部件——安装于高压绝缘平台上的间隙触发控制箱和平台测量箱内的板卡损坏相对频繁,而此类平台上弱电设备的缺陷处理需将串补装置转检修状态,造成一次设备非计划退出运行,对电网运行产生极其不利的影响.从串补保护设备缺陷情况统计入手,通过对间隙触发控制箱和平台测量箱内反复出现的缺陷进行了原因分析,进而对第一代国产串补保护核心部件的薄弱环节提出了优化措施,为后期国产化串补保护改造在功能设计、性能优化、生产制造等方面的工作奠定了坚实的技术基础.研究成果的工程应用将全面提高串补装置可靠性和可用率,为地区电网的安全稳定运行提供有效的技术保障. 相似文献
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奉节串补站站址选择在线路中间,串补装置能满足近期、远期规划。同时,站址选择在线路中间,串补站处短路电流大大降低,其需要的MOV容量也随之减小,有效地节省了工程投资。串补站的监控系统采取基于现场总线网和工业以太网的双层网络3层设备结构,整个系统分站控层、前置层和间隔层。奉节串补站由万县500kV变电站代管,采用初期有人值班、远期过渡到"无人值班有人值守"方式。 相似文献
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500kV河池固定串补运行情况分析 总被引:6,自引:0,他引:6
《电网技术》2008,(Z2)
介绍了500kV河池固定串补工程的必要性,以及串补装置一次系统和二次系统的主要组成设备。基于该串补系统现场运行及试验中出现的一些主要问题,讨论了由于电磁干扰等原因导致GAP拒触发保护、MOV不平衡保护、平台保护以及光纤通道异常使保护闭锁4种保护误动作现象,通过改进一次设备和二次设备的布局和走线,提出了解决办法并且得到了现场运行验证。提高串补装置二次设备的抗干扰能力和可靠性是今后串补建设和运行的主要任务。 相似文献
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世界上第一个全可控的串补工程;世界上第一个常规与可控模式混合型的串补工程;世界上第一个补偿度高达50%的可控串补工程。……当拥有诸多"世界第一"光环笼罩的甘肃成碧可控串补工程展现在世人眼前的时候,人们不禁要问,这是一个什么样的工程?诸多世界第一意味着什么?……带着这些疑问,记者走进了中国电力科学研究,走进了还不为人所熟知的输电线路固定串补/可控串补装置…… 相似文献
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Stationarity of the EEG series 总被引:1,自引:0,他引:1
Blanco S. Garcia H. Quiroga R.Q. Romanelli L. Rosso O.A. 《IEEE engineering in medicine and biology magazine》1995,14(4):395-399
The authors introduce a routine for the analysis of stationarity, which is based on the weak stationarity criteria. From the application of the weak stationarity criteria, one see that only in some cases or in some epochs of a series will the information obtained from these algorithms be reliable. Therefore, one can only obtain dynamic information in those cases. As a complement to this finding, the correlation dimension and the Lyapunov exponents were calculated for the different EEG series analyzed 相似文献
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The technical characteristics of VA explosive-proof motors produced by OAO VEMZ are cited and the design and features of explosive protection are described. 相似文献
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This paper introduces the application of a new method based on Fourier series expansion, to derive the frequency response of a thyristor controlled series capacitor (TCSC). The theory and the numerical approach are presented and the results are reported. Although this method is solely applied to the TCSC device in this context, it is completely general and may well be applied to any type of switched power device. The analysis shows the behavior of a TCSC at frequencies other than fundamental frequency. Such information is very important for sub-synchronous resonance (SSR) as well as other harmonic related studies 相似文献
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为提供合理选择串联补偿装置(简称串补)安装位置的理论依据,采用理论分析与电磁暂态仿真计算相结合的方法,综合分析串补安装位置与潜供电流、沿线电压分布、串补补偿有效性及金属氧化物变阻器(MOV)容量等方面的关系.串补位置对线路潜供电流、沿线电压分布有一定的影响,需要在工程论证阶段重点考虑,但对MOV容量影响不大.串补位置对补偿线路电抗的有效性方面有一定的影响,线路距离越长,影响越大. 相似文献
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对电容器组串联电抗器的剖析 总被引:1,自引:0,他引:1
为了限制电容器组合闸过程中的涌流,限制操作过电压和抑制电网中高次谐波对电容器的影响,在电容器组中加装串联电抗器,会取得满意的效果;通过实例计算说明电容器、电抗器和电容器组的电压和电流的变化情况。 相似文献
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Megavarna Ezhilarasu Pitchaimuthu Thamilmaran Kathamuthu 《International Journal of Circuit Theory and Applications》2020,48(2):214-230
In this paper, we make a revisit of a simple LCR circuit introduced earlier in 2005 by Thamilmaran et. al., and present the circuit simulation studies of its dynamics using the PSpice circuit simulator package. This is a simple sinusoidally forced series LCR circuit, employing an ordinary single PN junction diode in conjunction with a negative conductance as its nonlinearity. In circuit theoretic terms, this circuit is a modified form of the forced van der Pol type oscillator and is interesting because it exhibits a dual nature, namely, a forced van der Pol type circuit behaviour and an MLC circuit type behaviour for different parametric ranges. In addition, statistical studies have shown the circuit to possess strong chaoticity. Subsequent works on this circuit have shown the birth of strange nonchaos through four different routes, namely, the Heagy-Hammel route, gradual fractalization route, intermittency route, and Bubbling route. In lieu of these, we look at the circuit afresh and study its dynamics in an exhaustive manner. These studies reveal many new bifurcations and routes to chaos. These results have been verified using hardware experiments in addition to numerical computations. 相似文献
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This paper presents an integrated scheme for protecting and controlling series injection voltage-source inverters used with electrical grid systems. The scheme uses a number of strategies to provide a continuous current path for current from the secondary winding of the injection transformer for both transient and longer term fault conditions. These strategies can also be used to provide a current path during normal operation of the external AC system, facilitating startup and shutdown of the series injection system, as well as recovery from a fault. Both simulation and experimental confirmation of the integrated protection scheme are presented 相似文献
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提高自增湿质子交换膜燃料电池水管理能力的关键在于电池组结构设计。采用反应气串联供给的电池组结构,且反应气经循环回路进入电池组进行再利用。实验结果表明:氢气循环对电池组内水分的均匀分布有一定的促进作用,氧气循环操作对电池组性能影响明显。 相似文献
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在不同放电截止电压条件下,分析了2串(2S)锂离子电池组(标称容量为3850mAh)的放电容量、循环性能、组内电芯间电压差(ΔV)和内阻之间的相关信息,以优化电芯配组的筛选条件。结果表明,电芯起始电压差较大的电池组随着循环的进行,电压差进一步迅速变大,容量衰减加快。电池组放电截止电压由6.0V提升到6.8V,电芯间电压差明显减小,尽管0.5C和0.2C放电容量分别损失约3.6%和2%,但可有效提高电池组的使用性能。同时,结合直流放电电阻(DCR)和电化学阻抗谱(EIS)测试结果指出,串联配组时,除了考虑单体电池的容量、电压和内阻三个因素外,电芯的DCR值能更直观反映电芯放电时的受到阻挠程度,可作为配组考虑参数。 相似文献