what is the implecation when a main distrubution panel reads negative KVAR
hi all CEans,
is someone can explain why negative KVAR occur in a Main distribution line where all of its load in an inductive (Aircon, Chillers, Water pump and UPS with static switch).
thanks,
is someone can explain why negative KVAR occur in a Main distribution line where all of its load in an inductive (Aircon, Chillers, Water pump and UPS with static switch).
thanks,
Replies
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freak16Can you elaborate your question please?
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Arpi dont know inside details of that but from my basic knowledge what i suppose polarities with which it is connected to mains is not correct
suppose with same voltage polarity if i reverse the polarity of current coil(anything measuring current) or vice versa then there may be a chance of getting -ve kvar.
so i advice u to flip your current measuring device terminals once and plz let me know whether the problem resolve or not. -
JCgalTo elaborate, before we conduct the annual preventive maintenance of electrical system the reading is positive but now it is negative. i am wondering how this happened the load are all RL. The problem here is this MDP support all the critical equipment when this happened million of dollars will be lost in an instance.
thanks for the reply. -
JCgal
Hi arp, thank you for your info. actually we have the same idea but i was hesitating because no one was altering the connection even before we conducted the PM of electrical system. Also i was suspecting that the UPS (2 unit of 80KVA) was affecting this measurement because the UPS room humidity wasn't stable (45%-55% normal but now it was 60% - 65%). The aircon that we using in both UPS and DAta center room was Precise Aircon unit meaning this unit will automatically adjust the temp and humid in normal level.Arpi dont know inside details of that but from my basic knowledge what i suppose polarities with which it is connected to mains is not correct
suppose with same voltage polarity if i reverse the polarity of current coil(anything measuring current) or vice versa then there may be a chance of getting -ve kvar.
so i advice u to flip your current measuring device terminals once and plz let me know whether the problem resolve or not. -
ankurjariwalaARP is right.....kindly reverse the polarity of the main CT (by shorting the CT shorting links to ground).....
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