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HANDBOOK REQUIREMENTS - Central Maine Power Company

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93<br />

93<br />

1104. HARMONIC LOADS<br />

Equipment that draws current with a high harmonic content<br />

can have a serious impact on the quality of the <strong>Company</strong>'s service.<br />

The <strong>Company</strong> requires that any service comply with the<br />

maximum harmonic current distortion limits given in IEEE<br />

Standard 519-1992. Table 10.3 of that standard provides the<br />

limits for individual harmonic distortion and Total Demand<br />

Distortion as a percent of maximum demand load current. A<br />

maximum Total Demand Distortion of 5% is generally required at<br />

the point of common coupling as defined in IEEE Standard 519-<br />

1992.<br />

Examples of equipment that draw high harmonic content<br />

current include variable speed and variable frequency drives,<br />

computer power supplies, electronic lighting ballasts and<br />

rectifiers.

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