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  1. A

    Generator Humming Sound

    Greetings, We have a 7FA generator with humming sound. metal temperature of bearing is not high, so I think the problem is not from bearing clearance. can you share whatever information you have about it? Note: unit is running since 2-3 months with this problem, and waiting for the...
  2. A

    Detecting Spark Discharge in 7FA Lube Oil Filter

    well, thank you for your reply. As you said, combination of conditions causes the varnish. the oil is tested monthly (NAS value not reached 7). The oil we have since 2008 and it has never been replaced. usually the load in early morning is 90 MW, and near the noon it will be 140MW. for...
  3. A

    Detecting Spark Discharge in 7FA Lube Oil Filter

    Greetings, I am trying to find the root causes of varnish formation in our 7FA lube oil tank. One of the root causes I came across is the spark generated when oil passes through the lube oil filters. also there is another reason which is air bubbles in the oil but this is not our topic. I...
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