Results 21 to 30 of about 13,430 (151)
Gaoya dianqi, 1993 计算了手车结构中外部接线对真空灭弧室弧柱的电动力,认为横磁触头结构真空断路器在开断大电流时,外部接线产生的电动力是导致开断失败的主要原因。建议尽量缩短真空灭弧室两端径向引出线的长度,以减少外部接线对灭弧室开断能力的影响。
谭燕, 何维忠
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Gaoya dianqi, 2011 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过程,探讨了真空灭弧室与SF6灭弧室对开断能力提升的协同作用,结合混合断路器开断能力提高的机理分析了混合断路器对其操动控制机构的要求。最后设计了一种基于真空断路器与SF6断路器串联的光控模块式混合型断路器实验模型,实验模型采用永磁操动机构解决真空灭弧室和SF6灭弧室的协调问题,可使混合断路器的开断性能得到较好的发挥。
程显 +4 more
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Gaoya dianqi, 2013 发电机断路器电源侧短路电流具有较大的非对称度,在特殊工况下,甚至会出现电流延迟过零的现象。笔者结合实际工程中的发电机参数,计算了考虑电弧前后发电机断路器电源侧短路电流的变化,阐述了电源侧短路电流出现延迟过零的原因,分析了电弧对电源侧预期短路电流的影响。对比发电机断路器电源侧预期短路电流计算结果和系统侧短路电流开断试验数据,分析了发电机断路器电源侧短路电流的开断能力,尤其是具有延迟电流零点短路电流的开断能力,其结果可作为确定发电机断路器电源侧短路电流开断能力的参考依据。
成勇 +5 more
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Gaoya dianqi, 1960 当具有试验设备,并能在这些试验设备上检验断路器开断给定短路容量的能力时,才能创造新的大容量的高压断路器。 网路试验站可能性有限,而具有冲击发电机的试验设备价值昂贵,这是需要设计高压断生器人工试验线路的主要原因。 虽然已设计出的断路器开断能力试验的人工线路有很多种,它们共同的特点是:具有两个回路,即被开断电流的回路和恢复电压的回路。
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World Medical &Health Policy, Volume 17, Issue 4, Page 912-920, December 2025.ABSTRACT In Brazil, the healthcare system is based on the provision of a public system that offers free and universal services to all citizens, supplemented by private initiative. Evaluating user satisfaction plays an important role in identifying improvements and promoting organizational changes that benefit everyone involved.
Patrícia Silva Bazoni +8 more
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World Water Policy, Volume 11, Issue 4, Page 1048-1064, November 2025.ABSTRACT Groundwater governance is complex due to several externalities associated with groundwater being an invisible natural resource tied to the land with millions of extractors and limited means of exclusion. The paper traces the evolution of groundwater irrigation in India and the corresponding change in groundwater laws and policies to address ...
Anindita Sarkar, Amrita Sarkar
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Gaoya dianqi, 1999 交流高压跌落式熔断器（简称熔断器）在电力系统中所遇到的开断条件,均应在型式试验中得以验证.因此,在开断试验中既要考虑配电系统短路电流暂态波形的特点,又要考虑各种短路电流的开断能力.所以IEC282—2—1995确定了各种开断电流的5种试验方式:方式1,试验100%额定开断电流能力,基于熔断器开断短路电流期间产生的电弧能量与预期开断电流值近似成正比,此方式验证灭弧管熄灭这一电流能力;方式2,试验0.6～0,8倍额定开断电流能力,虽然这一电流产生的电弧能量小于试验方式1,但开断这一电流的燃弧时间可能较长 ...
刘富波
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Integrative Conservation, Volume 4, Issue 3, Page 277-286, September 2025.This study provides an innovation to address the challenge in accessibility to samples and genetic markers in Snow leopard conservation genetic studies. We performed next‐generation sequencing (NGS) on 19 fecal samples obtained from the eastern Qinghai‐Tibet Plateau, and successfully assembled 17 complete mitogenome sequences (~16,720 bp) and ...
Chen Cheng +7 more
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短路电流直流分量对断路器电弧长度、压气室压力、喷口气体质量流的影响研究
Gaoya dianqi, 2021 随着电网容量的不断增大,电力系统短路电流直流分量的时间常数有很大可能大于其标准时间常数45 ms。目前非对称短路电流直流分量对断路器燃弧阶段关键参数的影响规律尚无研究。因此,文中研究目标是获得短路电流直流分量对断路器燃弧阶段关键参数的影响规律。基于高压断路器内部结构建立电弧物理焓流仿真模型,分别研究气体断路器开断对称电流和非对称电流时,燃弧阶段的关键电弧参数如电弧长度、压气室压力、喷口处气体质量流等参数的变化规律。研究结果显示:相同燃弧时间条件下,相比于对称短路电流,非对称短路电流开断时 ...
马飞越 +7 more
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Detection of canine external ear canal lesions using artificial intelligence
Veterinary Dermatology, Volume 36, Issue 4, Page 424-432, August 2025.Background – Early and accurate diagnosis of otitis externa is crucial for correct management yet often can be challenging. Artificial intelligence (AI) is a valuable diagnostic tool in human medicine. Currently, no such tool is available in veterinary dermatology/otology.
Neoklis Apostolopoulos +3 more
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