The constriction performance of vacuum electric arc at high current levels depends on the contact material and its operational principle . axial magnetic field ( amf ) contacts can prevent the vacuum electric arc from shrinking in the vacuum interrupters 在大电流水平下真空电弧的收缩特性取决于触头的材料和工作原理,在真空灭弧室中纵向磁场( amf )触头能够阻止真空电弧收缩。
According to the different contact design , the distribution of axial magnetic field is different . the direction of the amf for single - pole contact is the same within the whole inter - electrode gap , and it changes for the multiple - pole contact 根据触头设计的不同,纵向磁场的分布也不同,对于单极触头纵向磁场的方向在整个电极间隙中都是相同的,对于多极触头纵向磁场的方向则是变化的。
Adopting the short circuit electric current of to formate the test prove that this contact turn on and cut off performance . according to ablation situation of contact surface after testing , have analysed that coil type double - pole amf influences electric arc 采用短路电流合成试验验证了这种触头的开断性能,根据实验后触头表面的烧蚀情况,分析了线圈式两极纵向磁场在大电流时对电弧特性的影响。
It can still decrease influence of the eddy current greatly while contace surface of coil type double - pole amf structure is not need to be slotted , so it can also decrease surplus axial magnetic field when the current is at zero and axial magnetic field hysteresis time 线圈式两极纵向磁场触头结构的触头表面不需开槽仍能大大降低了涡流的影响,因此也减小了电流零点时的残余纵向磁场和纵向磁场滞后时间。
The hysteresis time of the axial magnetic field in the structure without iron core when the current is at zero is shortest . after the iron core is put into , the hysteresis time will be increased greatly , but if iron core is slotted , the hysteresis time will be decreased 最后计算了电流过零时的纵向磁场滞后时间,无铁芯结构纵向磁场滞后时间最短,加入铁芯后滞后时间明显增大,在铁芯中开槽可使滞后时间缩短。
This paper has studied the structure of the one - sixth turn axial magnetic field of the cup vacuum interrupter with iron core and distribution of the axial magnetic field . the axial magnetic field reduces loss of radial energy of arc post plasma , and makes the arc voltage reduce 本文着重研究了带铁芯的1 / 6匝杯状纵磁真空灭弧室的结构以及纵向磁场的分布,纵向磁场的引入降低了弧柱等离子体径向能量损失,使电弧电压降低。
The axial magnetic field distribution on center surface of contact gap and contact piece are calculated when the current is at peak . it can be found that the intensity of axial magnetic field and radial magnetic field uniformity are strengthened after the iron core is put into , this helps to improve the stability of the vacuum arc 计算了电流峰值时触头间隙中心平面和触头片上的纵向磁场分布,可以看出加入铁芯后纵向磁场强度和径向磁场均匀性增强,这有利于提高真空电弧的稳定性。
According to direction of magnetic field , the touch head is divided into horizontal magnetic field structure and vertical magnetic field structure . in the paper a new type vacuum interrupter based on horizontal magnetic cup touch head was designed and the performance was researched when it was applied to the low voltage breaker 根据所产生的磁场方向的不同,可分为横向磁场结构和纵向磁场结构,本文设计了一种具有杯状横磁场触头结构的真空灭弧室,研究它在低压真空断路器中的开断性能。
A new double - pole axial magnetic field contact design and its characteristics are introduced . the double - pole amf contact not only can generate very strong amf but also has better fielduniformity . it is applied to the vacuum interrupter which is in the high rated short - circuit breaking current with the high rated current . the basic operational principle of the new contact design is researched 本文描述了一种新型线圈式两极纵向磁场触头结构真空灭弧室的设计及其特性,该线圈式两极纵向磁场触头不但能够产生很强的纵向磁场,而且较均匀,尤其适用于额定短路开断电流大、额定电流大的真空灭弧室。
Further measurements for the deposited films indicate that the appearance and the deposition rate of the films also vary . after we simulate the magnetic field in such case with c program , these variations are owed to distributed change of magnetic field near the target surface and in the discharging space , which can influence the motion of charged particles in the plasma obviously 进一步对沉积薄膜的测量表明，薄膜的沉积速率等发生了变化，通过对空间磁场进行模拟计算发现，由于空间外加的纵向磁场引起了放电空间中以及靶面附近磁场分布的改变，影响了等离子体中带电粒子的运动并最终导致了上述变化。
