标题: 绕组法测温升家电与灯具对比..求高手指点... [打印本页] 作者: cx203099 时间: 2012-6-17 22:52 标题: 绕组法测温升家电与灯具对比..求高手指点... 请问各位大侠,绕组法测温升铝的衡量家电与灯具不一样呢?
灯具:The constant 234,5 relates to copper windings; for aluminium, this constant is 229.(EN60598-1:2008+A11:2009)
家电:k is equal to 234,5 for copper windings and 225 for aluminium windings;(EN 60335-1:2002+A15:2011)
为什么两个值不一样呢?