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详细介绍了REB103基本差动原理、比率制动原理、启动继电器动作原理、CT断线报警继电器动作原理以及电压限制原理的实现,同时对实际几种故障情况进行分析,从而阐明静态型母差保护REB103卓越的可靠性、灵敏性和快速性. 相似文献
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详细介绍了REB103基本差动原理、比率制动原理、启动继电器动作原理、CT断线报警继电器动作原理以及电压限制原理的实现,同时对实际几种故障情况进行分析,从而阐明静态型母差保护REB103卓越的可靠性、灵敏性和快速性。 相似文献
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宇宙量纲模型的思想适用于任何系统,物理系统适用,电路系统也同样适用。系统地分析总结了电路运行的基本原理,确定了电路系统的量纲,提出了电路的量纲模型、相似性原理和对偶性原理及规律拓展性原理等概念,并给出了相似性原理和对偶性原理的一些应用实例。 相似文献
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二次谐波制动原理是常用的判别变压器励磁涌流的方法。分析了二次谐波制动原理的常用算法,指出其不足之处,并以案例说明。分析了变压器励磁涌流的其他判据,如间断角原理、波形对称原理、磁通特性原理和基于变压器模型的保护方案。最后提出了智能理论识别法,并重点介绍了支持向量机的识别原理。 相似文献
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二次谐波制动原理是常用的判别变压器励磁涌流的方法。分析了二次谐波制动原理的常用算法,指出其不足之处,并以案例说明。分析了变压器励磁涌流的其他判据,如间断角原理、波形对称原理、磁通特性原理和基于变压器模型的保护方案。最后提出了智能理论识别法,并重点介绍了支持向量机的识别原理。 相似文献
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介绍了GIS设备几种常规的局部放电检测方法的优缺点,对超高频法检测原理、定位原理、抗干扰原理进行了阐述,分析了超高频法检测GIS局部放电的的技术关键. 相似文献
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基于数字同步采样原理的工频电参数测量系统 总被引:3,自引:2,他引:1
详细介绍了基于数字同步采样原理的工频电参数测量系统,给出了系统组成、工作原理、各环节的原理及应用,系统测量对象主要包括电流、电压、频率、相位、功率因数、有功功率、无功功率、电能值等。 相似文献
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McNamara A. C. Snyder Carl R. Oliver Join T. 《Industry Applications, IEEE Transactions on》1974,(5):618-623
The problem of coordination of lamp, fixture, ballast, and final application of high wattage metal halide sources is addressed. It is our intent to clear up some common misconceptions about lamp lumens versus lamp position and to describe a coordinated luminaire system for use in sports lighting or other large area lighting. 相似文献
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《Industry Applications Magazine, IEEE》2006,12(2):7-9
This paper discusses, many inventions referred to lamp development patent by Sawyer and Man conjointly and some by Sawyer separately. In July 1878, Sawyer, Man, and five other individuals formed the Electro-Dynamic Light Company. Westinghouse brought under its control practically all of the important incandescent electric lamp patents except those of the Edison company. Edison had secured a patent about lamp bulb. Upon the expiration of the Edison patent, the Westinghouse company resumed manufacture of the all-glass globe type of lamp. When the lamp business outgrew the capacity of the West 23rd Street factory, it was transferred to a new factory in Bloomfield, New Jersey. 相似文献
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该文介绍成倍提高荧光灯寿命的新途径,是采用在灯管内增加设有二对工作电极新技术,轮换使用这二对工作电极。相当于一只灯管,可以当作二只灯管来使用,使灯管相对提高70%至1倍的使用寿命。同时探讨应用《多电极特长寿命荧光灯》技术,当前存在的各种各样不同的看法。 相似文献
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The aim of the work described in this article is to find out the effect of cathode-heating voltage during continuous burning to the lamp life in dimming use. In order to find out the effect of cathode heating voltage to the lamp life, a lamp-life test was made. In addition to the nominal cathode heating voltage, three different cathode heating levels were chosen, namely -10, +10, and +20% of the nominal. Some of the test groups were burned undimmed and others dimmed. The cathode heating currents and voltages were measured at the same dimming level that was used when they were burning in a test rack. Differences up to -10% from the acquired optimum in the measured cathode heating voltages had about 2 % difference in lamp life. When the measured cathode voltage differed by -50% from the optimum, lamp life was less than half the maximum. With a proper cathode heating level, the lamp will reach nominal lamp life even if the lamp is dimmed according to daylight. 相似文献
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本文主要对自镇流LED灯的实验测量数据及性能分析,介绍目前比较提倡的绿色照明产品自镇流LED灯的特点,并与目前采用较多的自镇流荧光灯的性能、评价和光生物安全特性方面做一个比较和简要的分析。 相似文献