Powering of Generator AVRs
Powering of Generator AVRs
(OP)
Does anyone have a source of typical drawings showing the methods that an generator AVR can be powered.I am aware of the usual, pmgs,separate winding in the exciter etc, but I am more interested in other forms such as VTs and CT in series etc. We have a problem with an old french ( we think) generator.






RE: Powering of Generator AVRs
A satureable voltage transformer and rectifiers were used to energise the field. A series resistor would give fine tuning of the no-load voltage.
A current transformer would develop a voltage across a variable resistor. This voltage would be rectified and summed with the PT excitation voltage. This would give the required increase in excitation under load. This system was capable of voltage regulation in the range of 5%. I beliee that it could be set to over compensate and actually increase the voltage under load to compensate for line losses when it was a long distance from the generator to the load. Not sure about that though. I never had that situation.
It was possible to add an Automatic voltage Regulator to improve regulation to around 1% or 2%.
respectfully
RE: Powering of Generator AVRs
This series of threads might be of help:
thread238-150867: Static Excitation Pt. 1: Compound Boost Current Transformer
thread238-150959: Static Excitation Pt. 2: Reactors
thread238-151204: Static Excitation Pt. 3: Regulator Analysis
thread238-151797: Static Excitation Pt. 4: Regulator Analysis Part 2
thread238-158342: Static Excitation Pt. 5: Compound Boost CT revisited
Or maybe they won't! Good luck.
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Sometimes I only open my mouth to swap feet...
RE: Powering of Generator AVRs
RE: Powering of Generator AVRs
The battery is isolated against backfeed from the field supply by a large high voltage diode. Voltage build-up begins when a contactor in the DC circuit closes to allow current to flow from the battery; usually there is a large wattage resistor or a few ohms in series with the battery to limit the flashing current.
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Sometimes I only open my mouth to swap feet...
RE: Powering of Generator AVRs
RE: Powering of Generator AVRs
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Sometimes I only open my mouth to swap feet...