LOCATING THE SOURCE OF HARMONICS

When electric power users need to correct power factor, or they desire to meet IEEE 519 they must first locate the source of harmonics.

If the electrical power system is in the design phase, then the best approach is to gather as much information about any harmonics the non-linear loads will produce. A detailed one-line diagram including system voltage, transformer impedances, ASD Hp ratings, power rectifier KVA ratings, UPS KVA ratings, capacitor KVAR ratings is a good start to locating harmonics and the problems that may result. Myron Zucker, Inc. has produced a "Power Factor Correction & Harmonic Filter Questionnaire" which guides the user through a series of questions to obtain the data listed above and requests a one-line diagram.

The same approach should be used for an existing system. With an existing system, a harmonic study can be conducted to verify the system characteristics expected from the questionnaire or it can be done to determine the actual system characteristics. Myron Zucker, Inc. can provide assistance with both methods of locating harmonics.

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