Ambient Temperature/Humidity Loadability - Siemens 3AH3 Operating Instructions Manual

Standard specifications
The 3AH3 vacuum circuit-breaker comply with the
standards of IEC62 271-100, IEC60 694, BS 5311 and
DIN VDE 0670. The V-breakers 3AH3 for 15kV rated
voltage meet the requirements of the American
standards ANSI C37 with respect to their insulating
capacity.
Ambient temperature/humidity and loadability
The 3AH3 V-breakers are designed for the normal
operating conditions laid down in the standards.
Permissible ambient temperatures:
Maximum value
Average over a period of 24 hours
Minimum value
Permissible atmospheric humidity:
Relative humidity, 24 hours mean
Relative humidity, 1month mean
Under these conditions condensation may occasionally
occur. The rated normal currents listed in Fig. 1/4 were
laid down for 40°C ambience in accordance with DIN
VDE/IEC. Use under conditions other than normal is
possible with certain measures that can be implemen-
ted on request.
The maximum permissible load current as a function of
the 3AH3 V-breaker ambient temperature has been
plotted in Fig.1/2. The load currents indicated apply to
open-type switchgear. Metal-enclosed switchgear must
be derated as specified by switchgear manufacturer.
Determination of the load characteristic number
负载特性曲线号的确定
Rated normal current load characteristic number
额定电流 负载特性曲线号
1250A 2
2000A 4
2500A 5
3150A 6
4000A 7
Fig.1/2 Maximum permissible load current as a function of the switch
ambient temperature
图. 1/2 最大允许负载电流与开关环境温度的函数关系
Operating Instruction Siemens 3AH3 / 西门子 3AH3 真空断路器使用手册
适用技术标准
西门子 3AH3 真空断路器完全符合 IEC 62 271-100, IEC
60 694, BS 5311 以及 DIN VDE 0670 的所有条款, 而且
对于 15kV 产品 还满足 ANSI C37 中的绝缘部分.
环境温度,湿度与负载能力
3AH3 真空断路器按正常使用条件设计可在以下温度和
湿度时正常工作.
=+40 C 最高温度
=+35 C 24 小时平均温度
= -5 C
最低温度
允许大气湿度:
<95%
24 小时相对平均湿度
<90%
1 个月中相对平均湿度
在上述湿度时,可能会出现凝露.图 1/4 是依照 DIN
VDE/IEC 标准环境温度为 40°C 时额定电流函数曲线.
采取一定措施后断路器可在超标环境运行.
3AH3 最大允许负载电流是环境温度的函数, 图 1 示出了
这些曲线. 它们适用于断路器安装在敞开式的开关柜中.
如装于金属封闭式的开关柜中,则额定电流将有所减小,
应有开关柜制造厂重新确定.
Load current A
负载电流
Ambient temperature °C
环境温度
上海锐杰电器有限公司提供
=+40 C
=+35 C
= -5 C
<95%
<90%
-
1/3 -