电弧

On the base of practical transformer substation main connection,electriccomponents and system circuit model are first formed in the paper;analyze vacuum arccharacteristic and medium resume are analyzed,then,according to vacuum chamberphysical process of switching AC arc,resume process are divided into three stages:sheathdevelopment,neutral particles diffusion and static characteristic,with that,calculatingmodel of medium resume strength is erected and applied in the computing of vacuumcircuit breaker interrupting transform overvoltage;In the paper,Saber software is used tosimulate a whole switching process;As follows,overvoltage characteristic of vacuumcircuit breaker switching no load and load transformers,kinds of influence factors areanalyzed in detail;At last,vacuum circuit breaker switching capacitance groupovervoltage formative causes and electrode refining for lessening reignition are discuss.

本文针对中低压变电站的实际主接线建立各电气元件及系统的电路模型；在真空电弧的特点及间隙的介质恢复特性上，依据真空断路器灭弧室分断电弧的物理过程，将真空电弧熄灭后的恢复过程分为鞘层发展、中性粒子扩散和静态特性三个阶段，建立了相应的介质恢复强度的计算模型，应用到切除变压器操作过电压的计算中；采用Saber仿真软件模拟计算真空断路器切除变压器操作过电压；并分别对真空断路器切除空载及负载变压器操作过电压的特点与影响操作过电压的各种因素做了详细的分析；最后简要分析了真空断路器开断电容器组过电压的形成原因及为减少重燃的电极老炼措施。

Position of flux strip in its constricting arc is the key to constrain arc,which decides the heating characteristics of arc.

焊剂带遮电弧中的位置是约束电弧的关键，并决定着电弧的加热特性。

During the motion process, the stagnation and back commutation occur and worsen the performances of circuit breaker. According to the real interruption process, a three-dimensional(3-D) model of arc motion under the effect of external magnetic field is built based on magnetohydrodynamic, which can predict the restriking phenomena. With air vents opened to 60%, the restriking phenomena occur under 3mT magnetic field; when the magnetic field is increased to 5mT, the restriking phenomena disappears.

该文以磁流体动力学为基础建立了三维空气电弧等离子体在外部磁场作用下运动的数学模型，此模型可以预测电弧的重击穿现象，并发现当灭弧室的出口面积为60%时，电弧在3mT磁场的作用下运动时出现了重击穿现象，而当磁场增大到5mT时重击穿现象消失。

The traditional arc spray gun can only spray same material, but the arc spraying and flame spraying can be synchronously completed by use of the new device.

基于针对电弧喷涂应用的局限性，设计了一种能有效结合电弧喷涂和火焰喷涂优点的复合式电弧喷涂枪。

This article analyzes the reason and influence of Magnetic blow on welding arc during the welding process.

文摘：分析了磁偏吹在焊接过程中对焊接电弧的影响以及产生原因，通过调整和改善焊接电弧周围磁场分布，并采用反消磁法，克服和消除了磁偏吹对焊接电弧的影响。

In order to check the microscopic model, the paper does arc spectrum experiment, analyses arc spectrums of aerospace relay at aforementioned phenomena.

为了检验前述电弧微观模型，本文进行了电弧光谱实验，分析了航天继电器电弧等离子体在前述几种特定气氛下所发出的光谱。

According to the actual characteristic of the TIG welding arc, the spectrum Stark broadening is used to analyze electron density and the dual linear spectrum is used to analyze arc temperature.

结合TIG焊接电弧的实际特点，本课题采用发射光谱的Stark展宽分析电弧电子密度，采用双线法分析电弧温度。

With the analysis of the radiation theory, energy transmission and the balance properties of the radiation spectrum of the arc plasma, the distribution characteristics of the arc spectrum along frequency, space, and time field was investigated, which provide theoretical foundation for the research on the spectrum information of Pulsed MIG welding.

熔化极气体保护焊电弧等离子体辐射光谱中含有丰富的反映熔滴过渡的信息，本文在对脉冲MIG焊电弧光谱信息深入考察的基础上，首次将其应用于脉冲MIG焊熔滴过渡过程的控制研究中，并真正实现了一脉一滴（1峰0基）的熔滴过渡过程，开创了利用电弧光谱信息控制焊接物理过程的先河。

The sepctrum structures and the differences between TIG and MIG welding arc are analysed.The corresponding relations between metal transfer and welding arc spectrum structure are pointed out especially.

通过分析得出了TIG焊电弧光谱空间分布的差异性和MIG焊电弧光谱空间分布的相似性，着重指出MIG焊电弧光谱与熔滴过渡之间存在密切关系。

Results of experiments under different conditions show that, compared with arc electrical signal and arc light signal, arc spectrum signal is of more advantageous property. It can not only detect short-circuit metal transfer, but also more effectively detect droplet in free transfer mode than electrical signal. It can not only detect the droplet transfer in the CO〓 welding, but also can detect spray transfer in Ar welding with advantage over arc light signal. Especially, its outstanding capability of detecting steam spray transfer where other approaches fail, shows that are spectrum information has the utmost signal quality in metal droplet transfer detecting.

多种工艺条件下的对比实验表明，与电弧电信号及光强信号相比，电弧光谱信号具有更为优越的信号品质，其不仅可以检测熔滴短路过渡而且优于电信号可以有效地检测自由过渡；不仅可以检测活性气体保护条件下的熔滴过渡，而且优于光强信号可以检测惰性气体保护条件下的喷射过渡，特别是其可以实现熔滴射流过渡的检测，解决了这一用其它信号无法克服的难题，体现出电弧光谱信息在熔滴过渡研究中所独具的优越性。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。