Recent content by k0412d

One can also refer to "IEC 60076-1 Annex A (normative):Information required with enquiry and order" Giving normal and special information to give for an order.

The only one I can think of is 60071-1 (Annex A) which provides "Clearances in air to assure a specified impulse withstand voltage installation" Hope it can help. Regards. k0412d.

Hi lume7006, The design of the busbar comes, mainly, down to both mechanical and electrical. Both of them need, among others data, short circuit current info. Here below are the definitions of the terms you're refering from 60909 : Ith (thermal equivalent short-circuit current) the r.m.s...

Ok, thanks for the explanation, Ok, considering that transient overvoltage are mostly capacitive it makes sense. One last question before I draw a equivalent scheme to fully grasp the concept. So electromagnetic induced differential overvoltage is negligeable because it is shunt by the...

Hi all, My question is a bit wide, and I apologize for that. Often, Electrostatic ground shield are used in Rectifier transformer, I manage to get the following explanation from : Electric power transformer engineering / edited by James H. Harlow. // ISBN 0-8493-1704-5 Ok for the second...

Hello, As Scotty said, I would go for the International Electrotechnical Vocabulary (IEV) IEC 60050 Here below is the link for the online version of the IEV (aka Electropedia) : http://www.electropedia.org/ k0412d.

Call me a liar ? :p 60076-5 gives recognized minimal values (not mandated),and states : 'Commonly recognized minimum values for the short-circuit impedance of transformers at the rated current (principal tapping) are given in Table 1. If lower values are required, the ability of the...

Little correction, replace : IEC 60076-5 (Recognized minimum values of short-circuit impedance for transformers with two separate windings) By : IEC 60076-5 (Power transformers – Part 5: Ability to withstand short circuit / Table 1 : Recognized minimum values of short-circuit impedance for...

IEC 60076-5 (Recognized minimum values of short-circuit impedance for transformers with two separate windings) For rated power from 25 to 630kVA, Minimum short-circuit impedance : 4%

Thanks for the feedback.

Hello all, I've been studying lately dry type transformer and I realized it was a little more complex than I thought After searching in a book 4 types of dry transformers exist: Cast coil : The winding is reinforced or placed in a mold and cast in a resin under vacuum pressure. Lower sound...

ok, thank you very much.

Thank you very much for the info, Just to be sure that I'm getting it right, direct measurment is done by optic means to ensure dielectric insulation (Sensor/T° controller device)? And in dry type trfs, pt100 is embedded in neutral end when earthed or regardless of that? THanks

Hello all, My question is as said in the Title about Temperature indicator on transformers, for both dry and liquid immersed transformers. Just to be sure that I'm not missing any key point about the measurement here is my understanding for both types, please correct me if anything's wrong...

thank you for your responses.