Sunday 16 April 2017

Parallel generators don't divide reactive KVAR load equally


We have three generators cat 3412 800kW at our power station. They load in synchronization. But we have a problem in the sharing of the reactive power KVAR.


The voltage regulator used in the system is a model VR6, and the sharing used cross current compensation. The problem happened when we disconnect any of the three generators for maintenance and loaded again, as we found that the pf rapidally changes between them.



We had performed the following:



  1. Checked all the connection again for any wiring loose but fount it is ok

  2. Replaced the voltage regulator for all the generator step by step and nothing happened.


Can any on help me to find the root cause for this problem?




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