Power Quality Practitioner™

"Practitioner is one who brings an art or science to full realization"

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CASE STUDIES  OF HARMONICS PROBLEMS, ANALYSIS, & SOLUTIONS ON TRANSMISSION SYSTEMS

By Dave Mueller, Electrotek Concepts Dranetz-BMI Inc


​Analysis of harmonics on transmission systems


  • Large models are sometimes required
  • Different system configurations (contingencies)
  • Determining the harmonic loading
  • Determining the system damping
  • Evaluating solutions

ELECTRIC  VEHICLE CHARGER CASE STUDY

By Terry Chandler, Director of Engineer, Power Quality Inc. 


​​Power Quality study for EV charger post
• Manufacturer of EV has experienced several internal battery charger failures in new EV’s
• 2 sites, 1 in Arizona USA, 1 in Seoul,Korea




IEC 61000-4-30 CLASS A EDITION 3


The IEC 61000-4-30 Class A standard defines the measurement methods, time aggregation, accuracy, and evaluation, for each power quality parameter to obtain reliable, repeatable and comparable results between various brands and models of PQ instruments and systems


ELECTRIC TANKLESS WATER HEATERS AND POWER QUALITY

Contributed by Cowles Andrus III, July 2015


Abstract


In this whitepaper the basics of electric tankless water heaters (TWHs) are presented, along with their potential impact on voltage quality. Real-world graphs are discussed to illustrate the significant impact a TWH often has on residential power quality, and suggestions for mitigating these problems are given.


Introduction To Tankless Water Heaters


​Tankless water heaters (also known as instantaneous, continuous flow, on-demand, instant-on, flash, or inline water heaters) are characterized by the lack of any significant hot water storage. Instead, when presented with a demand for hot water, a TWH heats the incoming cold water in real time to the desired hot water temperature. The power required to raise a significant water stream (e.g. 2 or 3 gallons per minute) to a typical hot water temperature is very high. There two major types of tankless water heaters – electric and gas powered. The focus of this paper is the electric type.