Abstract

A recent survey attributes that 92% of all disturbances in power system is caused by voltage sags. Three-phase voltage sag can be classified in seven types as shown in Fig.1 (Bollen MHJ, 2000). The electrical sensitive load often trips of shunts down when voltage sag occur. It's very important to know how these sensitive equipment works when the voltage sag occur. This is the reason to develop the voltage sag generator that can created varied type of voltage sag waveform. The purpose of voltage sag generator is use to test the immunity of equipment against the voltage sag.

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