isolating transformer: transformer with protective separation between the input winding(s) and output winding(s);
separating transformer: transformer with input winding(s) separated from the output winding(s) by at least basic insulation;
5楼的定义来自IEC61558-1。
从定义中是可以看出两者的区别的:
isolating transformer 要求输入和输出绕组之间是“protective separation ”,而separating transformer要求输入和输出绕组之间
只要采用基本绝缘隔离就可以了。这里需要注意的是什么是“protective separation ”?这在同一标准中也有定义:
3.7.13 protective separation: Separation between circuits by means of basic and supplementary protection (basic insulation plus supplementary insulation or protective screening) or by an equivalent protective provision (for example reinforced insulation) (see 2.9 of IEC 60536-2).
由此,我们可以看到 isolating transformer 是必须双重(或等效)或加强绝缘的。对两种变压器定义分不清的,很可能是对“ protective separation”没有理解。
如果结合IEC61558-2-1, IEC61558-2-4separating transformer和isolaring transformer的特殊要求(如其中18.2 、18.3)来看,应该更明确一点。
EN60950在2.5章节有这样一段话:
A limited power source operated from an AC MAINS SUPPLY,or a battery-operated limited power source that is recharged from an AC MAINS SUPPLY while supplying the load,shall incorporate an isolating transformer.