PQI’s challenge was to improve transformer efficiency, reduce the subsystems’ zero-sequence impedances & improve load efficiencies
PQI’s challenge was to improve transformer efficiency, reduce the subsystems’ zero-sequence impedances & improve load efficiencies
2 PagesPower Quality International, LLC Telephone (888) 539-7712 • Website www.powerqualityinternational.com CASE STUDY Johns Hopkins University School of Medicine The Bunting Blaustein Cancer Research Building Baltimore, MD Facilities Description The Bunting Blaustein Cancer Research building was completed in 2000. This 122,000 square-foot mission- critical facility, which includes numerous laboratories and offices, accommodates more than 400 researchers and staff. Existing Conditions • Nineteen inefficient pre-NEMA TP 1 distribution transformers • 7.4% daytime loading of the transformers • Unacceptable levels of positive-, negative- and zero- sequence harmonic currents • Unacceptable zero-sequence harmonic impedances at 208/120-volts The existing distribu
