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随着真空断路器在中压领域的发展,永磁机构在柱上开关、中压断路器上的应用,引起了开关行业的广泛关注。文章介绍了真空断路器的各种永磁机构。 相似文献
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国内外真空断路器高电压等级开发动态 总被引:2,自引:0,他引:2
简要介绍世界各国真空开关制造公司,例如日本各公司和西门子公司开发的高电压各种等级的真空断路器技术情况。我国126 kV真空断路器开发情况。 相似文献
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真空断路器开断并联电抗器的三相建模 总被引:1,自引:0,他引:1
针对40.5 kV真空断路器开断并联电抗器的工况,为了消除现有仿真模型的不足,笔者简单综述了真空断路器开断感性小电流的仿真研究的现状,对一种型号的40.5 kV真空断路器进行了试验,得到其触头间介质动态绝缘强度曲线、高频电流熄灭判据和截流数据,并建立了断路器开断并联电抗器的三相仿真模型,同时考虑了三相间的耦合。应用ATP-EMTP软件进行了该型号真空断路器开断并联电抗器的三相仿真研究,并与现场试验结果进行了比对,仿真结果与试验结果大致相符。 相似文献
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为了研究基于高耦合度分裂电抗器(high coupled split reactor,HCSR)的并联型断路器的并联均流效果,推导了简单并联及基于HCSR的并联型断路器并联支路间不平衡电流的表达式,通过分析得出结论:HCSR单臂限流电感、双臂间耦合度、选用的断路器弧阻大小等因素是影响并联型断路器均流效果的主要因素。为验证上述结论,建立了HCSR、真空灭弧室、SF6灭弧室的电路仿真模型,开展了相关仿真分析,并采用合成回路进行了对应断路器并联开断实验。仿真、实验结果与理论分析结果相符合。基于上述研究结果,最终给出了针对不同类型并联断路器的HCSR单臂电感的选取原则,以用于指导新型并联断路器的设计。 相似文献
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为了使用户能更好地选用柱上真空断路器,从产品设计、制造及使用的角度,就产品的防涌流功能、外带单双侧隔离刀、电压互感器(PT)安装方式、避雷器安装及低温运行环境等方面介绍了选用柱上真空断路器时应注意的几个问题。建议用户在选用柱上真空断路器时,应从产品的性能及价格两方面加以考虑。 相似文献
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通过对电容器合闸涌流的计算、电容器熔丝重击穿和真空断路器发生重击穿的分析研究,解释一起由于误合故障电容器而引起10 kV电容器组熔断器“群爆”、真空断路器损坏的事故发生原因,进而提出选用优质真空断路器、自动投切电容器主站应具有闭锁回路、电容器的外熔丝选用性能较好的熔断器等,以避免此类事故重复发生. 相似文献
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Extending the Application Field of Vacuum Circuit Breakers to Generators for Capacities up to 400 MW
The progress that has been achieved in the development and manufacture of vacuum circuit breakers opens the possibility of using them for a wider range of applications at power plants, including as generator circuit breakers. Such characteristics of modern vacuum circuit breakers as increased breaking capacity and high switching life are factors that make them closer in competitiveness to SF6 circuit breakers for generators with capacities up to 400 MW. The article considers problem aspects relating to clearing of short-circuit faults in the generator voltage circuits and interruption of out-of-phase making currents and no-load currents of generator transformers. Conditions leading to a longer period of time to the moment at which the switched current crosses zero are considered. It is pointed out that, unlike the IEC/IEEE Standard 62271-37-013, GOST (State Standard) R 52565-2006 does not specify the requirements for generator circuit breakers in full. The article gives the voltage drop values across the arc for different design versions of vacuum circuit breaker contacts and shows the effect the arc in a vacuum circuit breaker has on the time delay to the moment at which the current crosses zero. The standardized parameters of transient recovery voltage across the generator circuit breaker contacts are estimated along with the contact gap electric strength recovery rates ensured by modern arc quenching chambers. The switching overvoltages arising when vacuum circuit breakers interrupt short-circuit currents and no-load currents of generator transformers are analyzed. The article considers the most probable factors causing the occurrence of switching overvoltages, including current chopping, repeated breakdowns of the circuit breaker contact gap, and virtual current chopping. It is found that, unlike repeated breakdowns and virtual current chopping, an actual current chopping does not give rise to dangerous switching overvoltages. The article also determines the vacuum circuit breaker application field boundaries in which dangerous switching overvoltages may occur that would require additional measures for limiting them. 相似文献
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In this paper, the authors show the necessity of using vacuum interrupters connected in series at the pole of vacuum circuit
breakers designed for a voltage of 110 kV and above to reduce the probability of restrikes up to the values required by the
corresponding standard for class C1 and C2 circuit breakers. 相似文献
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风能作为可再生的绿色能源,将成为以分布式发电为特征的智能电网的重要组成部分.然而现有电力系统抗风电扰动能力差是影响风电产业发展的关键性制约.采用分频输电技术可解决上述风电并网问题,而分频输电会造成断路器开断短路电流时有较长的燃弧时间,从而引起断路器的开断能力降低.笔者综述了分频输电对真空断路器开断能力的影响.Slade... 相似文献
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介绍了几种结构新颖的低压断路器。包括旋转动作的断路器、封闭式万能断路器和低压真空断路器,以这些最新开发的电器为基础,论述了低压断路器结构设计的发展动向。 相似文献
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