光伏逆变器的温升不能使用常温叠加?
因为我们没有那么大的温度箱. 大家的温升是怎么测试的?产品多大？为何常温叠加？ 我觉得可以的。用了温度箱，要么出现强对流风影响结果，要么等同限制了散热。 jjlamshushushu 发表于 2013-10-31 11:06 static/image/common/back.gif
产品多大？为何常温叠加？
产品也才20KW,问题是我们没有这么大的温箱啊.
要是那些500KW的是怎么测量的? 不需要温箱，相对封闭的室内就可以了 这个要看产品申请的环意温度，标准里是分大于50度和小于50度来进行，相关条款内容见如下：
CL 4.3.2.1 of IEC 62109-1:
Tests of equipment rated for use in ambient temperatures up to 50 °C may be conducted at
any ambient temperature in the range given in 4.2.2.1, in which case the difference between
the maximum rated ambient temperature and the actual test ambient is to be subtracted from
or added to (as appropriate) the measured temperatures for comparison to the limits specified
below.
PCE rated for use in ambient temperatures more than 50 °C shall be tested at the maximum
rated ambient temperature ± 5 °C. The difference between the maximum rated ambient
temperature and the test ambient is to be subtracted from or added to (as appropriate) the
measured temperatures for comparison to the limits specified below.
不过就算是申请的环意温度小于50度也一般会放在环温箱里测试，或者有可控温升房也行，因为逆变器基本上在申请的最高温度（如50度）下进行温升测试时会出现降额，而如果不用环温箱采用直接测试后加上去后的结果会严酷的多，大多都会Fail。 4.2.2.1 Environmental conditions
Unless otherwise specified in this standard, for example with regard to environmental
category as defined in 6.1, the following ambient environmental conditions shall exist in the test location:
a) temperature of 15 °C to 40 °C;
b) a relative humidity of not more than 75 % and not less than 5 %;
c) an air pressure of 75 kPa to 106 kPa;
d) no frost, dew, percolating water, rain, solar radiation, etc. 本帖最后由 lanfeiyuner 于 2013-10-31 19:42 编辑
清水白菜 发表于 2013-10-31 13:58 http://bbs.angui.org/static/image/common/back.gif
这个要看产品申请的环意温度，标准里是分大于50度和小于50度来进行，相关条款内容见如下：
CL 4.3.2.1 o ...
汗,我都没仔细看过这里, 因为以前做其他标准,都可以叠加, 所以都没仔细看过标准.
但是这次认证机构说不可以叠加, 搞得我好郁闷.
叠加的不合算，会超过的。还是找个温箱好，不通过重测更不划算了。 不叠加 直接放到恒温箱中测试温升，要是叠加你测一百次都不会过 跟你说
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