文件编号
Doc. No.
NDT2920257
版次
Edition
第
2
版
Version 2
实施日期
Implementation date
2019-08-19
8
to insulation.
(
6
)温度降容。
(6) Temperature de-rating.
断路器安装场所的环境要求如下表
4
:
Environmental requirements for installation location of breaker are shown as follow Table 4:
表
4
断路器安装场所的环境要求
Table 4 Environmental requirements for installation location of breaker
项目
Item
规范
Specifications
周围空气温度
Ambient air
temperature
-35
℃
~
+70
℃
相对湿度
Relative
humidity
(
在
+40
℃时
)
不超过
50%
,最低温度湿月最不超过
+25
℃,且该月平均最大相
对湿度不超过
90%,
并考虑因温度变化发生在产品表面上的凝露。
The relative humidity of the air does not exceed 50% (at +40
℃
), the lowest
temperature in the most humid month should not 25
℃
, and the
highest humidity in this month should not exceed 90% while condensation
on breaker surface caused by temperature change should be taken into
consideration.
海拔高度
Altitude
不超过
2000m
Lower than 2000m
污染等级
Pollution
degree
3
级
Level 3
温度降容系数见下表
5
:
Temperature de-rating coefficient is shown as follow Table 5:
表
5
温度降容系数
Table 5 Temperature de-rating coefficient
温度
Temperature
+40℃
+45℃
+50℃
+55℃
+60℃
+65℃
+70℃
降容系数
De-rating
Coefficient
1
1
1
0.978
0.957
0.934
0.911
注:当使用环境温度低于
40
℃
时,产品可正常使用,不存在降容。
Notes
:
When ambient temperature is less than 40
℃
, breaker can be used normally without any
de-rating.
2019.12.31
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