Power Quality international, inc. is a full service company, providing power system solutions to its many consulting, utility, industrial, governmental, institutional, commercial and manufacturing clients. The mitigation of load-generated power system harmonics and efficiency improvement is a specialty.

PQI clients and customers benefit from over forty years of engineering and technical ‘hands-on’ field experience. With the exception of Antarctica, we have completed major international assignments on every continent.

With its technical and manufacturing ‘know how’, PQI was first to develop and commercialize a number of leading-edge technologies and products. These devices, some of which are listed here, provide cost-effective solutions to various power system problems.

2009 - First to co-develop a Transformer Excitation & Impedance Loss Measurement Instrument, based on the earlier Voltage & Current Differential, Loss Measurement Method Instrument that limits the efficiency calculation error to ±0.033%, when measuring a transformer’s excitation and impedance losses under any linear or any nonlinear load condition.

2003 - First to use a sophisticated computer program that is in compliance with IEEE Std. C57. 110-1998, that allows our engineers to recalculate any transformer’s linear losses and efficiency into its nonlinear losses and efficiency, which is based on a specific harmonic current profile.

The PQI Calculator™ will compare the performance of any two transformers and calculate a payback and return-on-investment.

2003 - First to use the Voltage & Current Differential, Loss Measurement Method Instrument that limits the efficiency calculation error to ±0.033%, when measuring a transformer’s excitation and impedance losses under linear or any nonlinear load condition.

2003 - First to develop a Technology Demonstration Vehicle that demonstrates all harmonic related ‘power quality’ issues, and compares the accuracy of the Power-In – Power-Out, Loss Measurement Method and the Voltage & Current Differential, Loss Measurement Method.

2001 - First complete line of Harmonic Filtering Transformers that exceed EPA – Energy Star^® linear load efficiency requirements under nonlinear load conditions.

PQI HarMitigator™ products, which include harmonic mitigating power, distribution and drive isolation transformers, are approximately 2% more efficient than any competing harmonic mitigating transformers and up to 15% more efficient than typical conventional or K-Rated transformers, under severe nonlinear loading.

2001 - First computed program that will calculate a solution for harmonic current, ‘penalty loss’ and power cost reductions, and system performance and power quality improvement.

The PQI Solution™ program provides a Statement of Design Objectives, a comprehensive System Study, a Mitigation Proposal and a Performance Guarantee.

2000 - First electromagnetic Zero-Sequence Harmonic Filter that shunts zero-sequence harmonic currents at the load-end of a branch circuit.

Mini-Z™ filters provide an alternative to de-rating conventional distribution transformers, applying K-Rated distribution transformers, increasing ‘shared’ neutral conductors or configuring branch circuits with separate neutral conductors, in an environment that is rich with zero-sequence harmonic currents.

1996 - First commercial sale of Medium Voltage Class sub-cycle Static Voltage Regulator Transformers for application in a utility’s distribution system.

PQI TransRegulator™ products mitigate the voltage sags that result from fault clearing events on a utility’s transmission or distribution systems.

1995 - First commercial sale of Medium Voltage Class, sub-cycle Static Transfer Switches for application in a utility’s distribution system.

PQI TransSwitch™ products provide uninterruptible premium power to a utility customer’s entire facility.

1991 - First complete line of Harmonic Filters and Harmonic Mitigating Transformers that shunt or cancel zero-sequence harmonic currents and/or cancel positive- and negative-sequence harmonic currents.

PQI HarMitigator™ products, which include harmonic mitigating power, distribution and drive isolation transformers, reactors and filters, provide the means to implement The PQI Solution™.

1990 - First to develop and apply Harmonic Mitigating Transformers that shunt zero-sequence harmonic currents with ultra-low zero-sequence impedance windings and cancel positive- and negative-sequence harmonic currents.

1986 - First electromagnetic Zero-Sequence Harmonic Filters that shunt zero-sequence harmonic currents from a three-phase, four-wire sub-system.

I0Filter™ products provide an alternative to de-rating conventional distribution transformers, applying K-Rated distribution transformers or

increasing feeder circuits’ neutral conductors, in an environment that is rich with zero-sequence harmonic currents.

1982 - First ‘on-line’ Partial Discharge Analyzers that monitor the condition of stator winding insulation systems in hydroelectric generators.

PDA-H^® technology remains the ‘world standard’ for failure avoidance and maintenance optimization. This technology is now used on turbo-alternators and medium voltage class motors.