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site last edited:

11/7/06

Power Quality & Load Survey
Power Quality Investigations
&
Load Measurement Surveys
 
 

Power Quality is a measure, or description, of the “purity” of electrical energy delivered to equipment. A Power Quality Investigation is generally performed to determine/verify if there is “too” much distortion of the voltage applied to equipment and normally to diagnose the cause. Monitored parameters of a voltage sinusoid include fluctuations in magnitude, frequency, and wave-shape. Often, current is also monitored, to assist in determining the root-cause of distortion. Voltage distortion tolerance curves have been developed by the Computer Business Equipment Manufacturer’s Association (CBEMA) that provide a guideline within which most computer equipment will operate without trouble. Other equipment tolerances, as specified by manufacturer, are to also be considered. The solution to power quality problem(s) vary greatly depending on the cause. Major causes of problems include: improper grounding/earthing, switching transients, harmonic interactions, and poor RMS voltage levels.

 

The most common reason for a Load Measurement Survey is to assist in diagnosing a Power Quality problem. Other common reasons include: confirmation of loading (or overloading), comparison of pre-construction to post-construction equipment installation/replacement, and measuring the effect of starting and/or running significant motors and drives.

 

 

PTS can perform Load Measurement Surveys and Power Quality Investigations. We can also design and install permanent solutions; and, can provide a system that will continuously monitor your system.

 

[Highlights of completed surveys & investigations to be posted soon.]

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