Undervoltage definition
Undervoltage definition
(OP)
Could you please advise me about the meaning of the protection function 27i. ( I Know that the ANSI Code for undervoltage protection is [27] but i did never hear about 27i. Also what is 27R ( somebody said:residual undervoltage). Does this function exist? if so whatis its application?
Thanks in advance.
Thanks in advance.






RE: Undervoltage definition
ANSI 27r : Residual Undervoltage relay.
Suggestion: Visit
http://www.orionitalia.com/products/Vmpr.htm
RE: Undervoltage definition
Generalised setting for 27R may be assigned as >20% with 5Sec & >50% instantaneous.
This also reduces the arcing ground under S-L-G fault.
(A Singh)
IOCL, India
RE: Undervoltage definition