62109-2对于隔离型逆变器的要求

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海之未央 发表于 2012-12-12 17:19
单点故障应该不包括初次级的短路吧？ 一般都是初级或者次级分别短撒

) I& K5 {$ J8 m要是內部有帶隔離型的Inverter, 初次級不做Single fault評估，需滿足相關隔離絕緣距離來滿足要求.。

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海之未央 发表于 2012-12-12 17:18
7 i$ F1 j& m2 D, a/ [; s3 J! f我也是这么理解的，即使短路也是初级和次级分别短。。。。但貌似某机构签证官上周跟我说即使有隔离变压器 ...

我同意那簽證官的說法，IEC 62109-2 中4.4.4.15.2.2 Design of insulation or separation—Note 1里有說明：

NOTE 1 These requirements are intended to protect workers who are servicing the AC mains system. In that scenario the mains will be disconnected, and the hazard being protected against is the array voltage appearing on the disconnected mains wiring, either phase-to-phase, or phase-to-earth. Therefore it is the PV array parameters (working voltage, impulse withstand voltage, and temporary over-voltage) that determine the required insulation or separation. The worker may be in a different location than any PV disconnection means located between the array and the inverter, or may not have access, so the insulation or separation provided in the inverter must be relied on. In a non-isolated inverter, only the required automatic disconnection means separates the mains service worker from the PV voltage. In an isolated inverter, the isolation transformer and other isolation components are in series with the automatic disconnection means, and separate the worker from the PV voltage in the event of failure of the automatic disconnection means.