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通过对矿灯用铅酸蓄电池进行不同的充电、放电试验,比较了蓄电池的寿命性能,提出较好的矿灯用免维护铅酸蓄电池充电方法,同时验证了锂离子蓄电池用作矿灯电源的寿命性能。 相似文献
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免维护蓄电池及先进的充电设备为变电所的安全运行及维护提供了可靠的保障。针对变电所的免维护蓄电池及充电设备在实际运行中出现的问题进行了分析探讨,总结出一些运行及维护经验。 相似文献
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免维护蓄电池在运行中的维护方法 总被引:1,自引:0,他引:1
针对河津电厂使用的德国阳光免维护电池及其它电厂的免维护电池在运行中出现的问题,从运行的角度,介绍了几种日常工作中的维护方法,主要有:充电电压的整定、环境温度对充电电压的影响、蓄电池的检测、充放电维护等。使其在运行中少出问题,延长寿命,更好地服务于电力系统。 相似文献
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对两组浮充工作状态下的免维护蓄电池组的单节电池浮充电压实际测量,引入统计学中标准误差的概念研究免维护蓄电池组均衡性与使用性能的关系,从而利用免维护蓄电池组均衡性的变化去评估它的使用性能。 相似文献
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阀控式铅酸蓄电池运行维护分析 总被引:3,自引:0,他引:3
在发电厂、变电站的直流系统或交直流不问断系统中,蓄电池组扮演着极其重要和不可或缺的作用。平时蓄电池组处于浮充电备用状态,当交流失电或直流系统故障时,蓄电池组必须向负荷提供能量,如直流电机、电磁机构、保护装置、控制、通信、自动化、照明等。由于阀控式铅酸蓄电池正常运行时不须对电解液进行检测和调酸加水,所以被称为“免维护”蓄电池。由于“免维护”这一词的误导,导致使用者放松了对阀控式蓄电池的日常维护和管理,造成蓄电池的早期失效, 相似文献
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对免维护汽车蓄电池发臭进行了试验分析。结果表明,使用PE隔板是蓄电池发臭的原因。产生恶臭的条件为:蓄电池接近干涸;使用PE隔板;充电过程;电池温度升高。 相似文献
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《Power Delivery, IEEE Transactions on》1998,13(1):73-77
IEEE Standard 1344, Synchrophasors for Power Systems, was completed in 1995. It sets parameters required to ensure that phasor measurement will be made and communicated in a consistent manner. It specifies requirements for the timing signal used for phasor synchronization and the time code needed for input to a measurement unit. GPS is the recommended time source and IRIG-B is the basic format used for time communication. The standard requires correlating phasors computed from unsynchronized and synchronized sampling to a common basis. Timetagging accurately and consistently is essential for wide area comparison of phase. The standard specifies information exchange and control message formats. These include data output, configuration, and command messages. It includes 7 annexes that discuss the concepts covered in the body of the standard 相似文献
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Yuan Chen Westergard L. Mojarradi M.M. Johnson T.W. Cozy R.S. Billman C. Burke G.R. Kolawa E.A. 《Device and Materials Reliability, IEEE Transactions on》2006,6(2):146-153
A design for reliability methodology has been developed for electronics for low-temperature applications. A hot carrier aging (HCA) lifetime projection model is proposed to take into account the HCA impact on technology, analysis of parametric degradation versus critical circuit path degradation, transistor bias profile, transistor substrate current profile, and operating temperature profile. The most applicable transistor size can be determined in order to meet the reliability requirements of the electronics operating under low temperatures. This methodology and approach can also be applied to other transistor-level failure and/or degradation mechanisms for applications with varying temperature ranges. 相似文献
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针对中国电力科学研究院开发的《PSD-SCCPC电力系统短路电流程序》中基于潮流和基于网络的两种短路电流计算模式计算结果存在一定差异的情况,从计算结果真实性、可比性、准确性和对电网的指导作用等方面分析、比较两种计算模式的适用环境。得出结论:基于潮流的计算模式,其计算结果能真实反映实际系统运行情况,适用于电网规划中的网架校验;基于网络的计算模式具有较强的可比性,适用于运行方式的安排和校验。最后提出开展基于网络计算模式修正系数取值研究工作的建议。 相似文献
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Taizo Kojima Hideo Nakata Motohiko Kawagishi Taku Uehara 《Electrical Engineering in Japan》1998,123(1):32-42
This paper presents a framework for constructing databases for supervisory control systems. The proposed framework utilizes a generation-based approach and object-oriented framework libraries. In this framework, a database is designed for the target system from a design template, and the software for the database system is generated from the database design. The generated database system includes a domain-specific object system and a diagram and plant data editor, which provides effective data input functions. © 1998 Scripta Technica, Electr Eng Jpn, 123(1): 32–42, 1998 相似文献
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直流线路中谐波的测量对于谐波的抑制和治理具有重要的意义。为此,介绍了一种新型的300A直流电子式电流互感器(ECT)的谐波测量方法。该方法采用自积分式的带铁氧体铁心的Rogowski线圈,既克服了传统线圈受直流偏移影响严重的缺点,又避免了空心Rogowski线圈在小信号时灵敏度低的不足。实验结果证明该线圈在满足准确度要求的条件下可忽略直流分量对于磁导率的影响。同时,在实验室条件下,对线圈及积分电路的线性度、频率特性和温度特性进行了评估,实验结果显示该系统可以对50~2500Hz频段的谐波进行准确测量。系统线性度良好,准确度达到1%,并能在-30~70℃的温度变化范围内稳定工作,满足公用电网电能质量谐波GB/T14549-1993的要求。 相似文献
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This paper presents two novel control schemes for static synchronous series compensator (SSSC) for dynamic series compensation and voltage regulation. The SSSC model comprises a harmonic neutralized multilevel 48 pulse voltage source converter. This paper investigates two novel control schemes for optimal series compensation, which are indirect control (constant reactance control) and direct control (constant voltage control) using pulse width modulation (PWM) switching techniques. The proposed model of SSSC within the power system is performed in Matlab/Simulink using the power system blockset. The performance of the SSSC schemes connected to the 230 kV grid is evaluated in both capacitive and inductive modes of operation under load excursions. The operation of the proposed controllers is also tested in a weak power in order to compare their performance for securing SSSC stability in response to system contingencies. 相似文献
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致力于提高电网实时数据平台的性能,针对实时数据平台中实时任务的特点,在分析了常用的实时任务调度策略的优点和局限性的基础上,改进了传统调度算法,提出了一种基于优先级的新的实时调度策略,既考虑了任务的截止期,又兼顾了任务的关键性。然后研究了在多服务节点条件下,根据加权负载率和截止期错失率来实现任务分配的均衡性,从而大大改善了实时数据平台的性能。最后设计并实现了一个任务调度的解决方案,并通过模拟实验对其性能进行了分析,验证了新算法的优越性。 相似文献