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Power Quality Forum
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Capacitor Controller |
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Question: Which controller do you reccomend for use with a single stage 900kVAr @ 12.47kV IEM capacitor bank? The manufacturer went out of business several years ago. |
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Answer: In our 40-year history we have used virtually every capacitor controller available on the market. These would include Maysteel, Beckwith, S&C Energyline, Fischer-Pierce, QEI, HD Electric, ABB and other controllers.
The FisherPierce 4400 controller has the advantage of providing control on several different parameters, including Var, Voltage, Current, Temperature, Time and combinations of these inputs.
Other controllers provide time control with a temperature and voltage override.
Most controllers are available with an RS-232 interface to speed programming, download stored data and for remote monitoring and control, if desired.
Please forward drawings of the existing bank and we will be pleased to discuss the retrofit of the bank with a new controller.
For multi-step capacitor control, European controllers such as the Beluk BLR-CA or the Alstom Novar 300 are preferable. |
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Offshore Oil Platform Power Factor |
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Question: How can we correct poor power factor and possible harmonics problems on an off-shore oil rig? |
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Answer: In similar cases in the past we have installed Low Voltage Automatic Filter Banks, modified for offshore installation, to improve power factor and reduce harmonics. Banks have drastically improved power quality on the platforms by correcting power factor and drastically reducing harmonic content. In the past harmonics were responsible for overheated generators and transformers. Improved power factor reduced current losses from generators in the form of heat. Correcting power factor has been shown to
release considerable KVA capacity. Raising the power factor on a KW load reduces KVA. Therefore, by adding capacitors you can add additional load to your system without altering the KVA. |
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