Page 26 - 山东开川电力设备有限公司

HXGN15-12(SF6)
单元式交流金属封闭环网开关设备
Unit type AC metal-enclosed ring network switchgear

● 选K机构的开关 SFL12/17.5 IVDP575305RI
SFL24K IVDP575304RI
● 选A机构的开关 SFL12/17.5 IVDP575303RI
SFL24A IVDP575302RI
● VD4-S真空断路器(ABB原装件)
○ VD4-S型真空断路器是专为单元开关柜设计的，其开断容量足以应付各种状态，包括正常投切设备或分支网络的操作以及特殊情况下开断短路等。
○ 真空断路器对在工作电流范围内频繁操作的网络尤为适用。VD4-S真空断路器配有弹簧操作机构具有重合闸功能(分-0.3s-合分-180s-合分)，并且动作可
靠，寿命长。整个断路器包括三只真空开关泡，外部是树脂绝缘筒，立式结构。
○ 电弧的熄灭是由于灭弧触头的螺旋型沟槽使电弧产生强制性移位的结果。由于开关绝缘筒内最低静态真空度是10-4至10-8巴，所以尽管开关触头间相对只
有不大的间隙，却可以得到很高的绝缘强度。电弧在短路电流第一个零点时熄灭。
○ 由于触头间隙小，电弧压降处金属气体等离子区导电率高，加上燃弧时间短，使得电弧能量极低，这对触头乃至整个开关寿命的延长都是有利的。

● Select K mechanism switch SFL12/17.5 IVDP575305RI
SFL24K IVDP575304RI
● Select the switch of the A mechanism SFL12/17.5 IVDP575303RI
SFL24A IVDP575302RI
● VD4-S vacuum circuit breaker (ABB original parts)
○ The VD4-S vacuum circuit breaker is designed for the unit switchgear. Its breaking capacity is sufficient to cope with various conditions, including the
operation of normal switching equipment or branch network and the breaking and short circuit under special circumstances.
○ Vacuum circuit breakers are especially suitable for networks that operate frequently within the operating current range. The VD4-S vacuum circuit
breaker is equipped with a spring operating mechanism with a reclosing function (minute -0.3s - combined -180s - combined), and it is reliable in
operation and long in life. The whole circuit breaker includes three vacuum switch bulbs, the outside is a resin insulated cylinder, and the vertical
structure.
○ The extinction of the arc is the result of a forced displacement of the arc due to the helical groove of the arcing contact. Since the minimum static
vacuum in the switch insulation cylinder is 10-4 to 10-8 bar, a high dielectric strength can be obtained despite the relatively small gap between the
switch contacts. The arc is extinguished at the first zero point of the short circuit current.
○ Due to the small contact gap, the metal gas plasma zone at the arc voltage drop has high conductivity, and the arcing time is short, which makes the
arc energy extremely low, which is advantageous for the extension of the contact and even the entire switch life.

TFQBSBUF $MPTF VQ

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