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Thanks all for your valuable feedback. Mbrooke, Does the utility just lay power cable on the ground if the cable has concentric ground and proper ground monitoring protective device. If so then i can implement that in my application. We typically use STARTCO relays for Ground monitoring...

Hello All, I have a question regarding the regulations over using a Medium Voltage cable (4160V or 7200V) installed by just running above ground(Not direct buried or concrete) For our project of dewatering the pit(Yes we are a mining company) we are considering options to supply a barge which...

@Gragas: Thank you much for your valuable feedback. Will follow up with your suggestions. @86ed: We have already written the contract in such a way to levi monetary fines on payments if they dont meet the installation timeline. What i am worried is that even then we levi fines, that is only a...

@zogzog - No The lineup was old and with Air insulated Circuit Breakers. Maintenance cost was high and reliability was low. Hence opted to go with a new gear. @VTER - We have already hired a EPC contractor and termed the project to be a turn key project. Hence they are supposed to do all this...

Hello All, We are planning to change our old lineup of switchgear to new Arc Flash switchgear next year shutdown at our company. The gear is already in order and in production. We hope that it will be ready by June which is when we have our next shutdown. Right now we have 12 days to complete...

Thanks for the reply mgtrp but I am still not getting it. Even if i connect the multiplex transformer phase-phase i can only go between 2 phases. Hence there is going to be an unbalance right. Wouldnt that current be flowing in the neutral? Am i missing something here?? Regards, Gokul

Hello All, I have a problem with single phase loading on to a 22.9KV distribution line which i need some help on. Hope you guys can help me. My System Details: 20MVA 115KV(Wye grouned) - 6.9KV(Delta) transformer connected to a 6.9KV Switchgear will multiple CB's. One of the CB supplies to a...

Thanks for all your inputs. I will post more information once i get some voltage drop readings and current balance readings. Thanks. gokul

Hello All, Please see the attached photo of a transfer switch which is used in a portable conveyor system. This switch is used to supply power either from a 13.8KV/480 V transformer or a 480V Generator. The problem we have been having with this transfer switch is that it shows high temperature...

I am yet to receive the report from the gearbox company but according to what i heard from the phone conversations, it has got substantial damage and has to be repaired..

All, Thank you so much for very useful insight you all have provided in this topic. Based on all the reply's i am intending to incline that Hipot and Surge testing is the end user's option. Having said that, on my particular situation, dont you all agree that having the hipot test and surge...

I searched for this topic on this forum and did find some topics discussing this. But none answered me straight if Baker testing is destructive or non destructive. I do not have a problem with coil resistance test and Meg ohm test. I know they are not destructive as the voltage level do not...

Bill, I understand that its a out of phase sync issue and so the loading of 500KW is not the influencing factor. But, it is hard for me to disregard that if that machine were to be running at 15MW then, it should have got to have more torque on that shaft. So when the out of sync condition...

Hello Everybody, Just thought of giving an update on the findings of the inspection test performed for the benefit of those who are curious... The stator looked fine... the end windings were all normal and were spared.... But one of our rotor windings was shorted. Further more to our agony...

macmckim, It is a Hyundai Ideal unit. In all fairness to Hyundai, They are ready to work with us. They were really fast acting and mobilized their crews once the incident happent. If they take care of this issue as it is supposed to be, then i would not have no problems in buying an another...

yes, It was a very bad day..And as our legal guys are saying its going to get ugly as well. Our folks are working on points to sue for compensation for downtime. Warranty wise it is for me to make sure that my client get the machine in a good condition he paid for. I will post some pictures...

David, Excellent Explanation. Thanks. I would also appreciate if you have any insights or pointers to look for and catch on the repair on the generator now. As you can see Scotty have given me good information but anything you may want to add might help as well. Thanks again.

rasevskii, While i agree that we should have not allowed nobody to do any check while the machine was running.... we had absolutely no idea the sync check relay was bypassed. I am not trying to defend myself here but just trying to provide more information. He was supposed to be the expert and...

Thanks Scotty for your timely reply.. Forgive my ignorance but i do not know what is RSO means. If this is a test done on rotors then, i should inform you that this generator in discussion is a Permanent magnet Brushless generator. So can a RSO be done on this type of rotor too? I too came to...

Hello Everyone, Hope everybody is doing great in this forum. I am right now working on a commissiong of a 15MW steam turbine generator and have some questions for you guys to answer I represent the customer who bought the generator unit. While we were commissioning this generator two weeks...