We operate 3 Gensets in parallel using Basler decs-200 AVRs. They set in AVR mode with Droop = 2%, and Var/Pf mode is off. But in settings i found Var min and Var max setpoints. so I have a question. What does these levels effect for?

Thanks for reply!

 

Roman69,

The question in the thread is, "What does these levels (Var min and Var max) effect for?" And, there is indication that Var/Pf mode is off (not used).

So, <b>Var</b> min and <b>Var</b> max would likely not have any effect on the operation of the gensets as they would be setting the minimum level of <b>Vars</b> and the maximum level of <b>Vars</b> when Var control mode was active. When Var control was active, these would likely set the minimum- and maximum allowable Var output levels when operating.

The Basler instruction books are fairly good and will likely have the best answer to your question which really must include some knowledge of the application and the generator.

Usually, most <b>AVRs</b> have a minimum excitation voltage and a maximum excitation voltage. The minimum excitation voltage is set to prevent slipping a pole or to prevent excessive heating due to leading VArs flowing in the generator stator windings. The maximum excitation voltage is usually set to prevent overheating the generator rotor windings by exceeding the maximum allowable current for the generator rotor. Sometimes, the maximum allowable excitation voltage level is set to limit the exciter output so as not to exceed it's rating.

So, to properly answer your question it would have to be clarified. It seems that AVR and Var might be confused here, and to really properly answer the question you may be trying to ask it would be necessary to know a lot more about the generators, their fields, and the excitation sources (since DECS 200s can use/control different sources of excitation power).