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真空断路器的使用日益广泛 ,真空灭弧室作为断路器的核心部件 ,其内部气体压力是决定真空断路器工作性能的重要参数 ,笔者就真空灭弧室内部气体压力的测定方法和现场使用情况进行介绍 相似文献
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The dielectric strengths of two samples of the same type of vacuum interrupter are compared. One vacuum interrupter is a new
and has not been tested for switching ability after manufacturing and the other is a vacuum interrupter with a 70% reduced
service life. Tests of the dielectric strength are conducted using a standard lighting pulse. Studies have shown that electric
breakdowns behind the front of a lighting pulse are caused by electric breakdowns in the screen system of the vacuum interrupter.
Possible reasons for the decrease in the dialectric strength of the screen system are discussed. 相似文献
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低压电弧故障断路器——一种新型低压保护电器 总被引:2,自引:0,他引:2
提出一种新型的低压保护电器--电弧故障断路器,用于防止故障电弧引起失火.介绍了其工作原理和应用场合及该断路器的发展动向.指出该断路器优点在于,与过电流保护装置相比,检测范围更大;与剩余电流保护装置相比,无需接地. 相似文献
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72.5kV真空灭弧室电位和电场分布研究 总被引:1,自引:0,他引:1
为分析72.5 kV真空灭弧室的电位分布和电场分布及其影响因素,建立了其轴对称有限元分析模型,计算了其电位分布和电场分布,研究了真空击穿的面积效应,并分析了主屏蔽罩的结构尺寸及多个屏蔽罩对真空灭弧室内部电场分布的影响。结果表明:真空灭弧室动静触头之间、触头和屏蔽罩之间的电位变化比较显著,灭弧室内部电场分布不均匀;随着触头间隙距离、触头半径及倒角部分曲率半径的增大,触头表面有效面积将增大,而灭弧室内部最大场强将有所减小;增大主屏蔽罩的半径和长度,可以使屏蔽罩两端的场强有所减小,在真空灭弧室内安装多个屏蔽罩,可以改善内部电场分布。计算结果可为高电压等级真空灭弧室的优化设计提供参考。 相似文献
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大容量发电机断路器用真空灭弧室 总被引:2,自引:0,他引:2
随着真空开关技术的发展,采用新型纵磁均布式触头技术的真空发电机断路器成功地通过了严酷的12kV/6300A/80kA型式试验。结果表明,其真空灭弧室结构先进、性能优异、完全符合GB/T14824-93发电机断路器通用技术条件的规定。本文着重探讨满足发电机回路严酷条件下大电流真空灭弧室的核心设计和型式试验。 相似文献
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Low rate of energy transfer in self-blast interrupters results in slow build-up of pressure in the expansion-volume. The arcing continues (for 20 to 30 ms) till the pressure in the arcing chamber is sufficient to flush the arc and the arc-product from the inter-electrode space. To promote the energy transfer and the efficiency of a self-blast interrupter, use of metal-vapour as an energy transport acceleration device has been investigated for the first time on an experimental self-blast interrupter. The results indicate an appreciable rise in rate of energy transfer to the expansion-volume gas in the interrupter. Different energy transfer rates observed during experimentation with the metal-vapours of aluminium, silver and copper confirm the feasibility of using and controlling of such a mechanism in a self-blast interrupter 相似文献
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高电压等级真空灭弧室绝缘结构的研究 总被引:6,自引:1,他引:5
为了解真空灭弧室的绝缘性能,通过对72.5kV真空灭弧室试品的冲击耐压试验以发现规律、分析其影响因素并改进绝缘结构。试验表明,其内部绝缘击穿并非发生在触头间隙,而是触头背部与主屏蔽罩间的间隙放电。增大触头边缘与背部过渡处的圆弧半径后,提高了耐压水平。进一步提出126kV真空灭弧室内部绝缘结构的设计方案,计算了电场分布情况并用真空灭弧室绝缘击穿的统计特性分析其耐压特性。 相似文献
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论述了基于真空灭弧室和SF6灭弧室串联的混合断路器开断能力提高的原理,分析了混合断路器两灭弧室的介质恢复过程。结合混合断路器开断能力提高的机理提出了混合断路器对其操动控制机构的要求,设计了一种基于真空灭弧室与SF6灭弧室串联的光控模块式混合断路器实验模型。实验模型能满足分析混合断路器中真空灭弧室与SF6灭弧室在不同时刻协同动作开断容量增益特性的要求,其协同动作时间分散性在微秒级。实验对比了SF6断路器与基于相同SF6灭弧室串联真空灭弧室的混合断路器短路电流开断能力,证明在不增加SF6气体使用量的前提下,混合断路器具有比SF6断路器更加优越的开断能力。 相似文献
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一种真空断路器真空度在线检测新方法 总被引:3,自引:1,他引:2
详细介绍了一种真空断路器真空度在线检测的新方法,其真空灭弧室经过特殊设计,使用内置式双波纹管灭弧室,利用外界气体压力和灭弧室内腔自闭力的平衡原理,当真空灭弧室有漏气时(外界大气压进入),引起自闭力的变化导致压力元件和位移传感器输出数据发生变化,从而使真空断路器本地闭锁并报警,同时经通用分组无线电业务(GPRS)网络也可实现远程监测报警.采用内置式双波纹管检测技术的真空断路器及其在线检测装置在现场应用情况良好,表明文中特殊设计的真空灭弧室具有推广实用价值. 相似文献
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作者测量了不同触头结构中高压等级真空灭弧室的分断能力及弧压特性,并对各种触头的设计思想及熄弧原理进行了讨论,通过对比分析,指出将单极线圈式纵磁和多极线圈式纵磁头应用于国内中高压等级真空灭弧室的必要性。 相似文献
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Shioiri T. Honma M. Miyagawa M. Kaneko E. Ohshima I. 《Dielectrics and Electrical Insulation, IEEE Transactions on》1999,6(4):486-490
This paper describes insulation technology for 72/84 kV vacuum interrupter for a new cubicle-type gas insulated switchgear (CGIS). The insulation performance has been increased significantly by a multi-gap shield configuration around the ceramic surface, which resulted in a 40% volume reduction of the vacuum interrupter. The CGIS housing the vacuum interrupter also reduced by 40% in volume. In the paper, the authors describe the basic characteristics on surface insulation and the area effect on surface insulation and their application to an new 72/84 kV CGIS 相似文献
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计算和分析了瓷柱式真空灭弧室的内部电场,同时经冲击耐压试验证明:瓷柱被金属蒸气污染是造成此种结构灭弧室容易发生内击穿的原因。 相似文献
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SF_6断路器电耐受能力的研究 总被引:1,自引:3,他引:1
本文利用模型断路器对SF_6断路器的电耐受能力进行研究,得到了触头和喷口的磨损与开断电流的关系,并对电耐受能力的指标标示提出新的方法。 相似文献
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Kamarol M. Ohtsuka S. Hikita M. Saitou H. Sakaki M. 《Dielectrics and Electrical Insulation, IEEE Transactions on》2007,14(3):593-599
Partial discharge characteristics in air under a low vacuum region were studied to develop a diagnosis technique to determine the gas pressure in a vacuum interrupter. The pressures were set at from 1.3 Pa to 2.6 kPa in order to simulate the leakage of gas into the vacuum interrupter. The structure of the vacuum interrupter, the measurement and the circuit construction for the experimental setup were described. The measurement of partial discharge occurring inside the vacuum interrupter was performed with a current transformer, intensified charge coupled device (1CCD) camera and photomultiplier tube. The measurement of partial discharge light intensity with a photomultiplier tube was more sensitive compared with that measured with a current transformer. From this result, an attempt has been made to distinguish the pressure below and above 260 Pa on the basis of the rise time and peak intensity of discharge light pulses. A relatively longer rise time (2 mus) with a smaller magnitude (less than 0.5 mA) was attributed to a Townsend-like discharge at pressures below 260 Pa, while a sharper rise time ~(10-100 ns) with a larger magnitude (greater than 1 mA) was characterized as a streamer-like discharge above 260 Pa. In addition, the estimation of gas pressure in a vacuum interrupter was made based on phase-resolved discharge characteristics utilizing an artificial neural network. 相似文献
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真空灭弧室中屏蔽罩电位动态测试及分析 总被引:1,自引:0,他引:1
本文通过测量真空灭弧室中屏蔽罩电位与电弧电压和恢复电压关系的动态变化波形,探讨真空灭弧室在短路电流分断过程中,真空电弧的燃弧规律和弧后介质强度恢复规律。在试验结果的基础上,对真空灭弧室屏蔽罩电位与触头间电压的动态关系进行了数学推导,从理论上分析了屏蔽罩电位的变化规律,证实这是一种研究真空灭弧室性能的可行方法。 相似文献