A voltage sag is a momentary (i.e. 0.5-60 cycles) decrease in the rms voltage magnitude , usually caused by a remote fault somewhere on the power system. Voltage sags are the most important power quality problem facing many process industry customers. Equipment used in modern industrial plants (process controllers, programmable logic controllers , adjustable speed drives , robotics) is actually becoming more sensitive to voltage sags as the complexity of the equipment increases and the equipment is interconnected in sophisticated processes. Even relays and contractors in motor starters can be sensitive to voltage sags ,resulting in shut down of a process when they drop out. This project is to design a Voltage Sags Generator, generating the voltage sags in three phases and single phase power system, controlled by the microcontrollor. The Duration is also controlled for accuracy and synchronizing the natural voltage sags.The designed generator can apply for testing electrical equipment in order to analysis the effect of the voltage sags. The result will be utilized to improve the specification in advance.
By
Kittipongsa Rattapha
Kittipathana Suwanakaradesha
Kiti Klinsukontha
