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  1. nandrade

    GENERATOR BRUSHES CURRENTE DESBALANCE

    Hi, our Main Generator (132 Mw - Ercole Mareli 13.8 Kv) has a problem in the brushes. The collector ring has 11 brush per side. (positive and negative). We had a high desbalance with each current´s brush that causes overheating and damage. recently we buy new brushes (Alstom - OEM Generator) but...
  2. nandrade

    Transformer cooling

    we have installed a 90/120/160 MVA Power Tranformer, 65 oC rise temperature. We have two groups of radiator, each one with 8 fans. This 16 cooling fans which start, one part (8) in the first lever of cooling and second part (6) in the second level of cooling together with 2 oil pumps (one upper...
  3. nandrade

    Generator RTD

    Is a Thermal Generator. It uses air for cooling and have 4 radiators underneath the generator where water circulates. For check the stator winding temperature, we have 12 RTD. 4 for each fase.(total 12). There are 4 damage, because the measure of the resistance in this devices are infinite. They...
  4. nandrade

    Generator RTD

    I have installed 12 RTD on the 133 Mw Generator stator winding, 4 for each phase. At the time, we have 4 damage. There`s another way to get a realistic value of the winding temperature, by other electric parameters calc???. Im afraid that we must open the generator, and take off the RTD damage...
  5. nandrade

    INFORMATION ABOUT RELAY

    HI, Please somebody can said to me, where i can find information about ABB Unitrol UNS3020, for Protection the rotor of generator against earth faults. I couldn`t find in the web. We want to test it Thanks.
  6. nandrade

    Buccholz Relay

    I made the functional test. I noted that when i fully pulldown the button, it didn`t reset, keeping closed. I had to flow dry air to reset it. I see that is a problem, and i buy a new relay to replace the older. I think that it could be the reason for the 20% open valve (i have only one, not...
  7. nandrade

    Buccholz Relay

    I have a 160 MVA 138KV/13.8 Kv transformer. I see that the valve between the tank and conservator, is 20% open. The Company who installed the transf. left it that position, because the transformer shutdown when energizated, by the buccholz relay operation. (with the valve open 100%, normal...

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