Import Underpower
Import Underpower
(OP)
Hi
I am an engg. trainee trying to write a protection philosophy for a distributed generation projetc and came across an article by beckwith electric
on "Use of Import Underpower as a means of protecting Against parallel operation in DG Interconnection Applications ". The article talks about Peak Shaving application. Could you help me getting a bit on highlight on what a peak shaving application means and Should I consider it a Active Protection or Passive Protection.
Thanks
I am an engg. trainee trying to write a protection philosophy for a distributed generation projetc and came across an article by beckwith electric
on "Use of Import Underpower as a means of protecting Against parallel operation in DG Interconnection Applications ". The article talks about Peak Shaving application. Could you help me getting a bit on highlight on what a peak shaving application means and Should I consider it a Active Protection or Passive Protection.
Thanks






RE: Import Underpower
You question seems to infer the use of on site generation to eliminate a portion of the utility demand.
Not sure what you mean by the other statements.
RE: Import Underpower
A directional power relay on the utility feed can monitor the facility's power use and alarm or trip if utility power consumption drops below some arbitrary value. The alarm or trip could be used to turn off the peak shaving generator since the peak load has passed. The same setting would also trip the generator if it started delivering power to the utility.
This would be an active control.
RE: Import Underpower
Just wondering, a simple doubt not related to earlier question though, Is it true, the CB rating is always selected on basis of sub transient reactance irrespective on the basis of size of motor or generator.
Thanks
RE: Import Underpower
RE: Import Underpower
Ind. generator + CB+ Transformer. Now for setting the rating of CB near Generator, only cable length up to CB and the Ind. generator reactance will come in to picture. Now the manufacturer has given me the short circuit reactane Xd". and the locked rotor current. So that means the three phs short circuit current will be I=1/(Xd"+Xcable). Now as the generation volatge is 600 V, so probably, It will be a MCCB and as far as my knowledge is concerned, Low voltage CB's has only one rating and HV rating has two ratings. Now I have to make sure that this CB is tested on X/R,which is equal to the generator X/R as that will contributed to Asymmetrical Component. Please advise if I am missing some thing here.
Thanks
RE: Import Underpower
RE: Import Underpower
Thanks
RE: Import Underpower