Transformer secondary Settings
Transformer secondary Settings
(OP)
I am dealing with a ulitity company. I am doing a coordination settings for a pump station. Utility company is doing their own settings. They insist on using instantanneous settings for SEL587(Secondary of transformer). But their settings would make trip the whole pump station, which is not coordinated with downstream. Their argumanet is, they have to trip the transformer at a lower fault level as soon as possible to protect the personel because of arc flash. But nomally nobody is there. What can we do with this?
Thank you.
Thank you.






RE: Transformer secondary Settings
RE: Transformer secondary Settings
I'd probably double check to make sure they are talking about instantaneous on the secondary overcurrent element.
RE: Transformer secondary Settings
RE: Transformer secondary Settings
RE: Transformer secondary Settings
RE: Transformer secondary Settings
How far is the Utility Co involved?? Are they involved up to or after the secondary design? Usually Util Co. is responsible up to the primary and the transformer. After the XFMR, secondary side, it's up to the contractor. I don't know your specific details, but set-up your limits with the Util. Co., and don't let them tell you what you do with your design (of course, just to mention, and as you might know, you will be responsible for all electrical after the XFMR sec. side)
regards
RE: Transformer secondary Settings
Utility transformer is only 50m away from Switchgear. I am involved only in seconday design so I am responsible for the secondary of transformer.
RE: Transformer secondary Settings
Ok, Is the Util. Co putting its hands on your design side?? Who is deciding to install this "tripping" device, you or the Util company?? Are this requirements suposed to be met according to the Util. Co manual/code?
If any problems in the future who's gonna fix/pay it, you or the Util. Co.?
victa1288, you wrote: "Utility company is doing their own settings." who is the designer here?? I'm confused now, but as I previously posted, make sure who is going to take responsibility/liability, and proceed.
RE: Transformer secondary Settings
RE: Transformer secondary Settings
Stevenal, I will suggest them to install a maintenance toggle switch in order to coordinate most of the time while minimize the arc flash exposure to Utility workers.