查询词典 reignition

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。

At last, arc reignition characteristic is defined for multiple-narrow slot chamber, and the mechanism of arc reignition process is analyzed. A mathematical model which forecasts the arc reignition process is improved for the first time by combining the striking theory of cathode layer with"black box"model for forecasting arc thermal reignition.

最后，通过试验确定了多纵缝陶土灭弧室中电弧重燃特性，对其机理进行了研究，并首次将阴极层击穿理论和预测电弧热重燃的黑盒模型相结合，建立了模拟陶土灭弧室中弧隙由电击穿到热重燃过程的电弧数学模型。

Except larger spatter loss coefficient, other usabilities including the arc stability, the ability of reignition, detachability, melting coefficient, fluidity of the slag, the appearance of weld, and the degree of coating redden are all better than those of former A102 electrode.

在原A102焊条药皮配方的基础上，改进药皮配方，研制的A102焊条与原A102焊条各项工艺性能对比试验研究的结果表明，研制的A102焊条除飞溅率稍大，其它工艺性能均优于原A102焊条。

The reignition phenomena and interrupting performance of a fuse can be studied by measurement to the post-arc fulgurite current.

因此通过弧后电流的测量可以深入研究有关熔断器的重燃问题和开断性能。

In his own words, to attain parinirvana is to see' the fire of life extinguished in that elemental condition of extinction which allows no residuum of possibility for reignition.

用他的话来说，就是达到涅磐看到了生命之火的熄灭。由于消灭的存在基本条件导致了没有转生的可能性。

By switching between polarities, arc reignition is made easier so that the HF can be reduced or eliminated.

两极之间的切换，电弧重燃更容易，高频可以降低或消除。

It is proposed that the most important factor to determine the AC flashover criterion is the recovery condition, but not the reignition condition as proposed by others.

决定交流污闪条件的最重要的因素是交流电弧的恢复条件，而不是以往人们所认为的重燃条件。

By observing the arc images after current zero , the reignition initial spot at the side of electrode is found, and the elimina tion method is presented.

通过观察电流过零后的真空电弧图像，发现了真空电弧的重燃点位置，并提出了清除的措施。

In this paper,the action of water mist on PVC fires in a cone calorimeter under different external radiant heat fluxes was studied and the reignition of the PVC fires was analyzed.

聚氯乙烯在燃烧时会产生许多有害的气体，例如氯化氢、氯气和二氧芑，造成严重的环境污染[1~3]。

SOME HAVE LOW AUTO-IGNITION TEMPERATURES WHICH GIVES THEM A GREATER CHANCE OF REIGNITION.

有些具有低温自燃特性，便很容易复燃。

Panorama Many people are dancing in a large sitting room.

在一个大客厅里，许多人在跳舞。

We fully understand how a microwave oven cooks food, it is first necessary to talk ...

我们充分理解一个微波炉煮的食物，这是首先要谈。。。