Static/Fixed Power Factor Correction Systems
Static or Fixed power factor correction capacitor banks are a less expensive alternative to the automatic equipment and are well suited where a fixed amount of capacitance is required on a continuous basis. These units are also well suited for large motor starting applications. They are easy to install and require a minimum of set-up time thus not requiring field support personnel. Maintenance is relatively simple allowing most firms to use trained in house personnel or local contractors to perform the required work. These units are available in voltage ranges from 480V to 35 kV and range in kVAR values as large as 30,000 kVAR.
Automatic Power Factor Correction Systems
Automatic power factor correction systems have, during the past 10 years, increased their presence in the large industrial and commercial consumer environment. The primary reason for this increase is the need to maintain voltage at acceptable levels due to the more sophisticated electronic devices in the electrical power distribution system. The common practice of placing large static blocks of capacitance at the customer's primary voltage level does not offer this type of control. During low load periods the voltage may rise to unacceptable levels due to leading power factor. In addition many utilities cannot handle the additional VARS on their system and are requesting that customers remove their capacitors from operation during times when they are not required. The automatic systems address both of these issues by automatically switching the power factor correction capacitors "ON" or "OFF" to maintain a desired target power factor under varying load conditions on the low voltage distribution systems of industrial, institutional, and commercial electrical power consumers facilities.
Static/Fixed Harmonic Filtering Systems
Fixed/Static harmonic filters and power factor correction capacitor systems are designed to provide continuous harmonic suppression to within IEEE-519 standards as well as power factor correction. These systems are extremely well suited for individual variable frequency drives or other harmonic generating equipment when a fixed kVAR value and single tuning filtering is required. These filter are also available in multi-frequencies where a single filter would not provide adequate filtering action. These units are excellent in systems where multi-frequency harmonic suppression is required, either for a large harmonic generating load or for a large industrial customer where large constant loading exist. These filters are easy to install and require a minimum of set-up time thus not requiring field support personnel. Maintenance is relatively simple allowing most firms to use trained in house personnel or local contractors to perform the required work.
Automatic Harmonic Filtering Systems
Automatic harmonic filters and power factor correction capacitor systems are designed to automatically switch "ON" or "OFF" to maintain a desired target power factor level as well as maintaining harmonic content to within IEEE-519 standards, under varying load conditions on the medium voltage distribution systems. Each stage of the system is tuned to the same frequency thereby insuring parallel resonance does not occur. In systems where multi-frequency harmonic suppression reactors are employed they are staged so that the lowest frequency stage is energized first and is turned off last. The common practice of placing large static blocks of capacitance or filters at the customers primary voltage level does not offer this type of control. During low load periods the voltage may rise to unacceptable levels due to leading power factor. In addition many utilities cannot handle the additional VARS on their system and are requesting that customers remove their capacitors from operation during times when they are not required. The automatic filter systems address both of these issues without operational or utility problems.
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