请问确定工作电压时如何考虑谐振电压的影响？

jeffy123

IEC 60335
3.1.3 working voltage
maximum voltage to which the part under consideration is subjected when the appliance is supplied at its rated voltage and operating under normal operation
NOTE 1 The different positions of controls and switching devices are taken into account.
NOTE 2 Working voltage takes into account resonant voltages.
NOTE 3 When deducing the working voltage, the effect of transient voltages is ignored.

提到确定工作电压时应该考虑谐振电压。
请问谐振电压在什么情况下出现？
什么产品中出现？
如果存在的话，如何计算工作电压？

gudongman

例：电容感应式电动机的副绕组与电容器串联会发生谐振，使电容器两端的工作电压比器具的额定电压高许多。