PT rating
PT rating
(OP)
While going through single line diagram of a power plant I found that the PT installed on a 66 kV line is rated as 42000-70/129v. I have a fairly basic question ; Is the PT of a correct rating? I shall be thankful for an explaination in this regard. Thank you.






RE: PT rating
RE: PT rating
For ANSI regions, the closest standard PT rating is 350/600:1 or 40,250:120/69.3V.
For WXMYZ burdens [200VA or less] on the 120V secondary, the primary current on a single ø-g PT would be 5mA or less. This is trivial ground current for subtransmission/transmission voltage (C57.13 group 3 PTs.) [Typical AC test current for routine fall-of-potential ground-resistance testing in 40mA.]
RE: PT rating
RE: PT rating
RE: PT rating
While going through single line diagram of a power plant I found that the PT installed on a 66 kV line is rated as 42000-70/129v. I have a fairly basic question ; Is the PT of a correct rating?
///It depends on its application on the one-line. Would you post what is this PT for? Some PT applications must have their primary connected to line conductors.\\\