Harmonics are usually recorded as interval (stripchart) data in PMI recorders. Each desired harmonic is recorded as a min/ave/max stripchart trace, for each desired voltage and current channel. Although this…
White Papers
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185 results in Power Quality — Clear
Power Quality
Identifying Loose Neutrals
This white paper describes what a loose neutral is, what effects it can have on electrical equipment, its causes, and some ways to easily detect if a loose neutral is…
Analyzing K Factor
K Factor is a measurement of current harmonic distortion that is used to de-rate transformers for harmonics. This white paper will discuss how K Factor is calculated, what its uses…
Transient Capture with the Vision and Revolution
Capture high-speed, high-voltage transients with the Revolution and Vision, using the optional transient capture system. Transient capture uses 1 MHz sampling for voltage, giving a 1 microsecond sample window, and…
Application of the GE Flicker Curve
This an overview of what the GE Flicker Curve is, how, why and when it was developed, and who developed it. Also, this paper covers some of the more useful…
Case Study: Ground Fault Detection
The main breaker tripped in a Motor Control Center. All circuits were meggered and checked out, but no cause was found for the trip. Because none of the load breakers…
Event Capture Function
This white paper is an overview of the Event Capture function available with PMI power quality analyzers. Event capture can be viewed with either ProVision or WinScan software. This paper…
Part 2 Computing Event Duration with Interval Data
Previously, a method was shown to compute cycle event durations with one minute interval data and one-second timestamps from Significant Change data. In this whitepaper, a method is given that…
Hookup Diagrams for Common Mode Input
This white paper describes the proper hookup connections for common mode input style PMI power analyzers. PMI offers the ability to monitor with two styles of voltage input connections to…
Power Consumption vs. Energy Usage Reports
The Power Consumption and Energy Usage reports both measure kilowatt-hours (kWh). In theory, they should provide identical information; however that is not always the case. Usually, these reports differ only…
Formulas for Power and Harmonic Measurements
PMI recorders use a variety of algorithms to compute RMS voltage and current, real, reactive, and apparent power, true and displacement power factor, and phase angle. The formulas for these…
Custom Initialization Templates for Application Recorder Setup
This white paper describes how to create custom initialization templates for application specific monitoring with PMI Recorders. PMI recorders have the ability to measure all types of power quality data.…
