共查询到18条相似文献,搜索用时 93 毫秒
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在对断路器进行经济评估时,往往比较关注购置成本而忽略了其他阶段所发生的成本,容易造成资金得不到充分利用。根据全寿命周期理论,建立了考虑资金时间价值的断路器全寿命周期成本(life cycle cost,LCC)模型,该模型能够对断路器全寿命周期成本进行计算和分析,为断路器进行经济评估提供决策。通过实例验证了该模型的有效性,并且提出在LCC的计算过程中必须全面计及各阶段成本和合理评估断路器的使用寿命。全寿命周期理论为断路器的经济评估提供了方法,同时也为其他电力设备的经济评估提供了指导。 相似文献
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为准确估算弧触头电气磨损程度,提出了一种基于断路器电弧功率的断路器状态监测算法,首先通过在电弧放电时测量断路器的端子上的瞬时电压和通过断路器的瞬时电流,对电弧放电功率和能量进行相应计算;然后采用断路器的累积电弧能量作为弧触头退化水平的评价指标,对断路器触头的电气磨损情况进行评估;最后通过仿真和试验验证了所提算法可准确评估弧触头的电气磨损情况,为断路器的弧触头的检修和维护时间提供了判断依据。 相似文献
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根据电力断路器的不同结构类型,探讨了针对不同结构的设备在线监测方法以及断路器通用特性的在线监测技术,提出了在线监测系统的架构,最后展望了在线监测技术的发展趋势。 相似文献
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针对一二次融合真空断路器的在线状态评估问题,提出了一种在线状态评估方法,包括评估指标体系和状态评估计算方法两部分,其中评估指标体系重点考虑一二次融合带来的变化,提出了5个一二次融合状态的二级评估指标,与真空断路器状态评估指标共同构成评估指标体系;状态评估计算方法在灰色关联度法和逼近理想点法的基础上,提出一种正则化处理方法,有效减小了异常数据的影响,并采用粒子群优化算法预选径向基神经网络模型参数以加速训练过程。结果表明,所提评估方法能反映一二次融合真空断路器的状态变化,具有工程实用价值。 相似文献
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在不拆解SF_6断路器灭弧室的情况下,动态电阻法可检测其触头状态,在测得触头动态电阻值并绘制出动态电阻曲线的基础上,构建了SF_6断路器触头状态专家诊断系统。该专家系统利用SF_6断路器出厂动态电阻曲线与运行后所测的动态电阻曲线之间的相关系数及弧触头接触阶段电阻-行程积分面积作为诊断依据,直接从动态电阻曲线中提取并计算相应参数,再依照诊断标准给出触头状态诊断结果。实例验证表明,选择该SF_6断路器触头状态专家诊断系统中两种诊断参数,均可准确诊断出SF_6断路器的触头状态,并可据此提出简单的维修方案。该专家系统是利用动态电阻法检修断路器状态的有力辅助工具。 相似文献
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为了使电网的短路电流计算和开关开断能力校核能有一个科学合理的依据,降低对开关设备的遮断能力要求在分析IEC 909标准、ANSI标准及暂态稳定计算短路电流方法的基础上,提出了以暂态电抗Xd忆作为电机参数进行短路电流工程计算方法,并以PSCAD/EMTDC搭建IEEE 9的动态仿真模型,以动态仿真结果为基准,给出了2个标准的精确度,把提出的短路电流计算方法与根据IEC 909标准、ANSI标准及机电暂态仿真计算的结果进行了比较分析,结果显示基于暂态电抗Xd忆短路电流计算方法具有较好的精确性,且可以明显降低电网短路电流评估计算值。 相似文献
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《全球能源互联网(英文)》2018,1(1):29-38
Firstly, relevant stress properties of millisecond level breaking process and microsecond level commutation process of hybrid HVDC circuit breaker are studied in detail on the basis of the analysis for the application environment and topological structure and operating principles of hybrid circuit breakers, and key stress parameters in transient state process of two time dimensions are extracted. The established digital simulation circuit for PSCAD/EMTDC device-level operation of the circuit breaker has verified the stress properties of millisecond level breaking process and microsecond level commutation process. Then, equivalent test method, circuits and parameters based on LC power supply are proposed on the basis of stress extraction. Finally, the results of implemented breaking tests for complete 200kV circuit breaker, 100kV and 50kV circuit breaker units, as well as single power electronic module have verified the accuracy of the simulation circuit and mathematical analysis. The result of this paper can be a guide to electrical structure and test system design of hybrid HVDC circuit breaker. 相似文献
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In the late 1970s, the US Navy recognized that electrical fires were becoming a major problem in submarines. Approximately three fires per year were occurring in the main electrical distribution switchboards across the submarine fleet. The Johns Hopkins University Applied Physics Laboratory (JHU/APL) worked with the Navy to design two basic arc fault detection (AFD) and continuous thermal monitoring (CTM) systems. The first systems were designed using all military-specification (Mil-Spec) hardware. At that point in time, Mil-Spec hardware greatly increased system reliability but it drove up the system cost. The most recent systems were designed using commercial-off-the-shelf (COTS) assemblies and parts and are cost effective for commercial use. These systems have proven effective in 450 V AC, 4160 V AC, and 700 V DC switchboards. The timing on the systems is adjustable to allow for optimum usage with air circuit breakers or sealed breakers. While the AFD/CTM systems have seen extensive use in military ships, they are equally suited for the protection of all types of critical switchboards. Commercial ships, power generation facilities, power distribution switchboards, hospitals, web hosting facilities, etc., could all benefit from the increase in power reliability offered by this type of technology. These systems can be included in the original design of the switchboard or installed in existing switchboards with equal ease. 相似文献
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