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But in practical operating, overvoltage caused by reignition of the vacuum switching device frequently appears, and it result in damage of the capacitor bank or the switchgear itself. Ensuring the switchgear against reignition and installing a protective device are two main approaches to avoid the phenomenon. In this paper, a study on overvoltage caused by reignition due to capacitor bank switching with the vacuum switching device and its preventive measures are carried out. The main work which has been done and researches are as follows: 1. The producing mechanism of overvoltage and its influence factor are analyzed. It is pointed out that single-phase reignition is the main reason for damage of the switchgear and two-phase reignition is the main reason for damage of the capacitor bank,so overvoltage of single-phase reignition and two-phase reignition are the emphases of prevention. 2. Analysis of the special working condition of the operating switch for capacitor bank is carried out. It indicates that the vacuum switching device is difficult to realize no-reignition under this operation condition, so it is more practical to adopt protection devices. 3. Analyses of protection effect of RC and MOA and their shortages are carried out. It shows that the two methods can only restrain effectively overvoltage caused by single-phase reignition, and they cannot protect the capacitor bank when reignition of two-phase occurs. 4. The operation principle of G-R damping device is analyzed and discussed emphatically.

本文针对真空开关投切电容器组时因重燃而产生的过电压及其防治措施进行了研究,所开展的主要工作和研究结果如下: 1、对过电压的产生机理及其影响因素进行了分析,指出单相重燃是导致开关设备损坏的主要原因,而两相重燃则是导致电容器组损坏的主要原因,因此单相重燃和两相重燃过电压是防护的重点; 2、对电容器组操作开关的特殊运行条件进行了分析,指出在这种运行条件真空开关难于实现不重燃,因此采用保护装置更具有现实意义; 3、对RC与MOA的保护效果和存在的不足进行了分析,指出这两种方法均只能有效抑制单相重燃过电压,而不能在发生两相重燃时保护电容器组; 4、重点对G-R阻尼装置的工作原理进行了分析和讨论,指出该装置接入后线路中将会出现两种频率的高频振荡,而电容器组上的过电压是由这两种振荡共同决定的; 5、根据对上述两种振荡的分析指出存在一个最佳电阻值使得过电压最低,并提出了电容器组电压和最佳电阻值的近似求解方法; 6、使用电气暂态分析软件MATLAB对G-R装置的保护效果进行了仿真计算,证实该装置确实可以有效抑制重燃时的电容器组过电压; 7、根据仿真与近似计算结果的偏差提出了近似计算的修正方法,经过修正后的过电压计算结果与仿真结果吻合较好; 8、对G-R装置中放电装置G与阻尼电阻R的要求进行了分析,指出采用编织电阻和真空间隙可能是最佳选择。

By means of the results of ordinal regression analysis, this study discovers phenomena as follows: in a single automobile which runs off the road, the main factors are such as the use of cell phone and seat belt, drinking alcohol, violative behavior, trip purpose, timing, visibility, and road quality; in a single automobile which hits islands, the key factors are consist of driver's license and qualification, the use of cell phone and seat belt, trip purpose, visible distance, road visibility, road quality, and limited speed; in a single automobile which hits the roadside objects, the primary factors include the use of cell phone and seat belt, driver's license and qualification, drinking alcohol, violative behavior, age, timing, trip purpose, and region.

由顺序回归分析结果可知影响事故严重度的关键因素。在冲出路外的单一小客车事故中,关键因素为行动电话使用情形、安全带使用情形、饮酒情形、违规行为、旅次目的、时段、道路能见度和铺面品质;在撞路中物体的单一小客车事故中,关键因素为驾驶执照、驾驶资格、行动电话使用情形、安全带使用情形、旅次目的、道路视距、道路能见度、铺面品质和速限;在撞路旁物体的单一小客车事故中,关键因素为行动电话使用情形、安全带使用情形、驾驶执照、驾驶资格、饮酒情形、违规行为、年龄、时段、旅次目的和地区。

The algorithm encodes the XML document and XML query tree, disjoints the multiple branch pathes into single paths, queries the singe paths and uses the stack to match the single pathes which have the same ancestors in the process of matching the single paths to the multiple branch pathes.

该算法首先对XML文档树进行编码,然后对多分支路径各结点进行编号,编号后将多分支路径拆分成单路径并对单路径进行查询,利用栈匹配具有共同祖先结点的单路径查询结果,最后得到多分支路径查询结果。

According to the comparison analysis for the force-displacement relationship obtained from stets of earthquake simulation tests for 3 RC single story structures and the quasi-static test for one RC single story structure (identical with the former 3 models), as well as the analyses for the natural frequency change of the 3 RC single story structures with the increase of the excitation levels, it is found that the accumulated hysteretic energy-dissipation capacity is critical for the structural safety even after serious damage.

本文首先通过对近场破坏性地震动的特性分析,给出了脉冲型地震动的量化定义,并通过研究归一化反应谱变化规律的方法,分析了两类脉冲组合即:波前脉冲组合以及波后脉冲组合对于主脉冲作用效应的影响,总结归纳出波前脉冲与波后脉冲对主脉冲作用效应的不同贡献规律,并通过单层钢结构模型的地震模拟振动台试验验证了理论分析结果,为进一步研究揭示脉冲型地震动中主脉冲的破坏能力奠定了基础。

The main products are: the pros and package towels, towels double-sided, single-sided, double-sided, three-sweater, double-sided single-Face Chuck jacquard, rib, double-sided single-wide Computer jacquard, Taiwan has a large fan-woven clothing factory, specializing in a variety of high-grade knitted fabrics, clothing brand products by domestic and foreign enterprises favor.

主要产品有:正反包毛巾机、双面毛巾机、单面机、双面机、三线卫衣机、单双面花盘提花机、罗纹机、单双面全电脑提花机,台帆公司拥有大型服装织造厂,专门生产各种针织高档面料,产品深受国内外品牌服装加工企业宠爱。

The invention provides a method for preparing a tube-shaped cathode of a direct methanol fuel cell, belonging to the fuel cell field and comprising the steps of: dispensing a single solution for gel injection molding at first, then adding a mesophase bituminous coal micro ball into the single solution and stirring evenly to obtain stable slurry, then casting the slurry into a die, preserving heat until the single solution reacts with a cross-linker completely to obtain a carbon-biscuit, after drying and sintering the biscuit in vacuum, preparing a diffusion layer and a catalyst layer on the surface by dipping process, and then coating polyester electrolyte membrane with a burette, rolling the carbon on a warm table to solidify the electrolyte membrane.

一种制备直接醇燃料电池管状阴极的方法,属于燃料电池领域。本发明首先配制凝胶注模用单体溶液,之后将中间相沥青炭微球加入到单体溶液中,搅拌均匀得到稳定的浆料,然后将浆料浇注到模具中,保温至单体与交联剂完全反应,得到炭管素坯,将素坯烘干、真空烧结后,在其表面采用浸渍工艺制备扩散层、催化剂层,然后采用滴管涂覆聚合物电解质膜,在加热台上对炭管进行滚压,使电解质膜固化。

One is the three different streamtube-methods which are single-disk single-streamtube, double-disk single-streamtube and multi-streamtube method based on the momentum theory, the other is the vortex method based on the potential eddy theory.

一是根据动量定理的流管模型得到的求解诱导速度的单盘面—单流管方法、双盘面—单流管方法、多流管方法;二是根据势涡理论得到的求解诱导速度的的涡方法。

Methods A set of 7 group-specific exonic 5' amplification primers and a single generic 3' primer were included together in a single PCR mix to facilitate a single PCR amplification per sample for HLA-DRB1 typing.

合成7个5'端特异性扩增引物和l个3'端共用引物,将上述引物混合在一起组成单个PCR反应用于HLA-DRB1的DNA测序分型分析。

Small bottle: 10 ml, 6 individuals; medical gloves: No. 2 pay; stainless steel Yashe Ban: 16 cm, 2 branches card button tourniquet: a single valve of the ventilator: 20 x20cm, 2 tablets; T - Flashlight: an electronic thermometer: 1; blood pressure Table: 1 Taiwan; Stethoscope: single: 1; roll splint fracture: 46 x11cm, 1 vol; finger fracture splint: 5 x11cm, 4 tablets; Yiyong Yang cylinders: 1.4 l, 1 sets of medical scissors: straight round 14 cm, 1把; medical scissors: straight sharp 14 cm, 1把; medical Yong Niezi: 14 cm have teeth, one; bleeding clamp: straight-mosquito, 2 To; scalpels films: 20 #, 2; surgical knife handle:# 4, 1; a needle clamp: 14 cm, 1把; medical suture needle round: 1 / 2 arc, 0.8x20mm, 2枚; medical 1.30 suture needle: 1/2arc, 0.9x24mm, 2枚; medical thread: 1 #, a beam; medical cotton ball: 5 tablets / bag, 2 packets; povidone iodine disinfectant solution: a bottle; compound alcohol disinfection Shijin: 21 x14cm, 4片; Alcohol cotton: 30 Tablets / bag, 1 cylinder; iodine cotton: five tablets / package bag, 4 packets; iodine Mianbang: single-cartridge, 20; wound paste: 72 x19mm, 20 tablets; Butterfly - Shaped wound paste: 4; self-adhesive wound Application: 6 x7cm, 4 tablets

小药瓶:10ml,6只;医用手套:中号,2付;不锈钢压舌板:16cm,2支;卡扣式止血带:1条;单相阀式呼吸器:20x20cm,2片;笔式手电筒:1支;电子体温计:1支;血压表:1台;听诊器:单头:1只;卷式骨折夹板:46x11cm,1卷;手指骨折夹板:5x11cm,4片;医用氧气瓶:1.4l,1套;医用剪刀:直圆14cm,1把;医用剪刀:直尖14cm,1把;医用镊子:14cm 有齿,1支;止血钳:直蚊式,2把;手术刀片:20#,2片;手术刀柄:4#,1把;持针钳:14cm,1把;医用圆缝合针:1/2arc,0.8x20mm,2枚;医用三角缝合针:1/2arc,0.9x24mm,2枚;医用丝线:1#,1束;医用棉球:5tablets/bag,2包;聚维酮碘消毒液:1瓶;复方酒精消毒湿巾:21x14cm,4片;酒精棉球:30粒Tablets/bag,1筒;碘酒棉球:5粒tablets/包bag,4包;碘酒棉棒:单支装,20支;创口贴:72x19mm,20片;蝶形创口贴:4片;自粘伤口敷贴:6x7cm,4片;自粘伤口敷贴:10x10cm,4片;自粘伤口敷贴:10x15cm,4片;吸血垫:10x10cm(1片/包),4包;医用纱布绷带:6x600cm,2卷;自粘弹性绷带: 2.5x450cm,2卷;自粘弹性绷带:5x450cm,2卷;自粘弹性绷带:7.5x450cm,1卷;医用纱布三角绷带:90x90x129cm,2卷;急救毯:140x204cm银色,1条;降温贴:单片装,2片;活络油:5ml,1瓶;云南白药:4g,1瓶;绿药膏:10g,2瓶;急救手册:1本;铝合金箱:1个。

Chrome steel products mainly include: Crowbar stay wrenches, wrench to stay single, stay-mei dual-use wrenches, percussion stay wrenches, bending Plum wrench handle with hexagonal wrench, F-type wrench, single-head wrench plum, plum bending percussion Handle wrenches, straight shank percussion Plum wrench, Crowbar Wrench plum, plum blossom wrench straight shank, convex-type percussion Plum wrench, double-headed wrench Plum, fitter flat shovel, double-headed C-type wrenches, double-headed wrench stay B double-headed Plum wrench, crowbar sharp, hook wrench, valve wrench, Afterburning shot, top, drill rod, curved handle percussion stay wrenches, ratchet wrenches, high-neck single-convex head Plum wrench, wrench and attachment sleeve.

铬钢产品主要有:撬棒呆扳手,单头呆扳手,呆梅两用扳手,敲击呆扳手,弯柄梅花扳手,内六角扳手, F型扳手,单头梅花扳手,弯柄敲击梅花扳手,直柄敲击梅花扳手,撬棒梅花扳手,直柄梅花扳手,凸型敲击梅花扳手,双头梅花扳手,钳工扁铲,双头C型扳手,双头呆扳手,乙型双头梅花扳手,尖撬棍,勾扳手,阀门扳手,加力杆,顶尖,钢钎,弯柄敲击呆扳手,棘轮扳手,高颈凸型单头梅花扳手,套筒扳手及附件。

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推荐网络例句

For a big chunk of credit-card losses; the number of filings (and thus charge-off rates) would be rising again, whether

年美国个人破产法的一个改动使得破产登记急速下降,而后引起了信用卡大规模的亏损。

Eph. 4:23 And that you be renewed in the spirit of your mind

弗四23 而在你们心思的灵里得以更新

Lao Qiu is the Chairman of China Qiuyang Translation Group and the head master of the Confucius School. He has committed himself to the research and promotion of the classics of China.

老秋先生为中国秋阳翻译集团的董事长和孔子商学院的院长,致力于国学的研究和推广。