Generator MVar Capability Testing
Generator MVar Capability Testing
(OP)
Hi
What is the impact of conducting MVAr capability test on the generator to prove the the ability of MVAr expoting to the system against the OEM supplied capability diagram. I will push the machine to the rated MVar and keep it constant for about three hours during that time verything must be stable incl temperature etc.All will be done within machine cabapility. Is there a place where i can get info on how to go about doing the test and other safety aspect i need to consider.
Any davice will be appriciated.
What is the impact of conducting MVAr capability test on the generator to prove the the ability of MVAr expoting to the system against the OEM supplied capability diagram. I will push the machine to the rated MVar and keep it constant for about three hours during that time verything must be stable incl temperature etc.All will be done within machine cabapility. Is there a place where i can get info on how to go about doing the test and other safety aspect i need to consider.
Any davice will be appriciated.






RE: Generator MVar Capability Testing
Things to watch for - V/Hz relay and Overvoltage Relay and depending where you are on the power chart, either stator heating or rotor heating.
RE: Generator MVar Capability Testing
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Sometimes I only open my mouth to swap feet...
RE: Generator MVar Capability Testing
MVAR testing is very dependant on system impedance and voltage levels. As you push out MVARS, the generator voltage will rise and so will your in-plant auxiliary voltages and utility system voltages. I usually run into voltage problems long before I reach the maximum point on any capability curve. I have dumped two province wide power systems trying to get the utility system voltage low enough so the power plant could push MVARS to pass the test.
If you have two generators in parallel you may be able to push MVARs from one and absorb some in the other, being very careful to watch the under excitation limits and the typical +/-5% voltage range on the generators.
If you have a good load flow computer model of the system you could do some quick checks to determine the practical voltage or MVAR limits.