Recent content by ccamts

Hi Everybody WE have to connect a 600 KW, 600 V induction gen to utility now GPR is not a concern on Generation side as the maximum it can go is 600/Sqrt(3) but the secondary(utility) line 69KV , a single line to ground fault curent from them could be a concern. I asked the utility that I need...

Hi Guys, I was wondering, if any body has a soft copy of Electricity and Distribution protection manual by Cooper Power. Cheers !

Hi RCWilson, A good observation for use of CT's through cables, could you advice where can I read about it conceptually. I would appreciat it, I got it what u said but not conceptually. This is not my question but interfering as I found it interesting. Thanks

Thanks Jraef and scotty, Rest I would try to figure out my self otherwise would bother you guys again. Thanks

Hi If any body could advice me, how to specify the rating of a motor contactor, I mean what the format stands for like in one of the threads I had 3RT10 15-1AB01 24V AC coil how to read it. # 2, What is the max, limit of current or voltage that we can use magnetic contactors, what vol or...

Hi I found this topic interesting, but a little confusing also, when we have a cut out and below that pothead in parallel with lightning arrester, So just wondering, is this true according to this arrangement the fuse will blow first for a lightening and a switching surge ?. cheers!

I am a small fish but just a casual suggestion the whole story of earthing depends upon ground fault current which is then related to GPR and then touch and step potential. SO we start it from back we get GPR and step and touch potential and see the value of resistance and if we realize that...

I got it now, so if I elaborate that means if I have to calcualte to rating of capacitor for this induction generator and the utility has asked that it should opeate between .9 lag to .98 leading. So what capacitor rating I need ? This is what I think it should happen, cos(fi)=.715...

Hey, I need this too, I am modelling two induction generators in paralle and I have to calculate their three phase fault current and single phase fault current.

Thanks but what does 71.5 % pf means cos(fi)=.715 fi=44.35 so how can 400 Hp= 417 KVA be in this case. Please advice

Hi Every body I forgot to add some thing here I have Locked rotor current= 1920 A %FLC 458 referred to full load current 100 % load code letter E, I need to calculate the 3 ph fault current and single line to ground fault current, as it is an induction generator, am I supposed to model it like...

Hi Guys, I got induction generator ratings from the manufacturer, A little confusing needs help: It says KW=298.4 *** V=575 v 400 HP LOAD 100% 75% 50% EFFICIENCY% 94.00 93.80 92.70 POWER FACTOR % 71.50 66.20 54.60 AMPS 419.10 339.50 274.40...

Both generators are similar I think they had an impression that it is gonna be one generator, so they did not put the second one, from the diagram I see they have only two relays SEL 551 and 547, I looked at the websites and I am also wondering, when we talk about bus protection that is a part...

Hi Guys, I have been given a protection single line diagram for a induction generator which will be connected to local utility. The actual situation is that there are two induction generators but the diagram has only one, so I have to develop a new one with two, So my question is Q #1 Should I...