ZN28-12、ZN28A-12系列真空负荷开关为额定电压12KV，三相交流50HZ的高压户内开关设备。产品符合GB1984-89标准，该产品总体结构为开关本体与操作机构一体安装或开关本体与操作机构分离安装两面三刀种形式。一体式结构即为ZN28-12基本型；分体式结构为ZN28A-12型，适应于各种固定式开关柜，如GG-1A（Z） XGN2A10（Z）等。
It is used in the network of 12KV and three-phade AC 50HZ and meets GB1984-89 standard.The can be installed together with operating mecha-nism(ZN28-12 type)and installed separately (ZN28A-12 type),for all types of fixed switch cabin.
It can be equipped with CD17 CD10A type DC electromagnetic operating mechanism and CT17 CT19 type spring-storing type operating mechanism.
名称
Name
|
单位
Unit |
数据 Data |
20KA |
25KA |
31.5KA |
40KA |
额定电压
Rated voltage |
KV |
12 |
额定电流
Rated current |
A |
630,1000
1250 |
1250,1600 |
1250,1600,
2000,2500 |
1600,2500
3150 |
额定短路开断电流
Rated short-circuit switch-off current |
KA |
20 |
25 |
31.5 |
40 |
额定短路关合电流（峰值）
Rated short-circuit controlly current (peak) |
KA |
50 |
63 |
80 |
100 |
额定峰值耐受电流
Rated peak withstand current |
KA |
50 |
63 |
80 |
100 |
4S 额定短时耐受电流
4S rated short-time withstand current |
KA |
20 |
25 |
31.5 |
40 |
额定绝缘水平
Rated insulating level |
工频耐压（额定开断前后）
Power friquency withstand voltage (before and after rated switch-off) |
KV |
40（断口48）42（Break 48） |
冲击耐压（额定开断前后）
Impulse resisting voltage (before and after rated switch-off) |
KV |
75(断口 84) 75（Break 84） |
额定操作顺序
Rated operating order |
|
分-0.3S-合分-180 S-合分
On-0.3S On-and-Off 180 S-on-and-Off |
机械寿命
Mechanical life |
次(times) |
1000 |
额定短路开断电流开断次数
Breaking times of rated short-circuit switch-off current |
次(times) |
30 |
20 |
操动机构额定合闸电压（直流）
Operating mechanism rated witch-off voltage(DC) |
V |
110,220 |
220 |
操动机构额定合闸电流（直流）
Operating mechanism rated witch-off current(DC) |
A |
71 |
128 |
操动机构额定分闸电压（直流）
Operating mechanism rated witch-off voltage(DC) |
V |
110,220 |
操动机构额外负担定分闸电流（直流）
Operating mechanism rated witch-off current(DC) |
A |
3.0,1.5 |
触头开距
Contact distance |
mm |
11±1 |
超行程（触头弹筑压缩长度）
Ultra travel(length of contact spring compressing) |
mm |
4±1 |
三相分、合闸不同期性
Three-phase switch kn-and-off not the same period |
ms |
≤2 |
触头合闸弹跳时间
Contact switch-on jump time |
ms |
≤2 |
平均分闸速度（刚分6mm高）
Average wcitch-off speed |
m/s |
1.2±0.3 |
平均合闸速度
Average switch-on speed |
m/s |
0.6±0.2 |
分闸时间
Switch-off time |
最高操作电压下
Under Max.operating voltage |
s |
≤0.06 |
最低操作电压下
Under Min.operating voltage |
s |
≤0.08 |
合闸时间
Switch-on time |
s |
≤0.2 |
≤20 |
各相主回路电阻
Each phase main return circuit resistance |
uΩ |
≤40 |
动静触头允许磨损累积厚度
Automatec striking and grinding cumulative thickness |
mm |
3 |
油缓冲器缓冲行程
Oil cushioning buffer travel |
mm |
10 |
