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Among the high-tech industrial processes, the semiconductor fabrication plants (or fabs) are typical examples which are sensitive to voltage sags. Sags can interrupt fab's production. After a severe sag, the recovery of fab back to its normal production sometimes takes more than 10 minutes or even hours. It has been a common consensus that to prevent the production tools of fab from false tripping by sags requires the joint effort from the power utility, fabs, tool makers and the power facility designers. This paper focuses on sags mitigation by the network reconfiguration of a utility power system at Hsinchu Science Park (HSP). The presented can be also valuable to other power utilities, science parks and high-tech industries.