Power Quality International, LLC 2404 Merchant Avenue, Odessa, Florida USA 33556 Telephone (888) 539-7712 Case Study The Wynn Cotai Hotel & Casino Macau, China Facility Description The Wynn Cotai Hotel & Casino’s three-phase, four-wire distribution systems are supplied by 13,800:415/240V power transformers. All three-phase loads are rated 415V while all single-phase loads are rated 240V. Challenge The vast majority of loads in this modern hotel / casino are nonlinear. These electronic loads produce high levels of positive- and negative-sequence harmonic currents. The single-phase loads, connected phase-to-neutral, also produce very high levels of zero-sequence harmonic current. Unlike the dual low-voltage distribution systems in North

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